Pub Date : 2023-01-01DOI: 10.1525/elementa.2023.00026
Sydney Cleavenger, Yongjian Chen, Albert Barberán
Plant-associated microbiomes play prominent roles in maintaining plant health and productivity. Here, we characterized the soil and phyllosphere microbiomes associated with mesquite trees in grazing and urban areas compared to natural areas in the arid Southwestern United States. Our results showed that grazing areas were associated with higher phyllosphere fungal richness, while urban areas had higher phyllosphere richness for both fungi and bacteria/archaea, and additionally, urban soils had lower fungal richness. Specifically, grazing areas were characterized by larger proportions of nitrogen-fixing bacteria in the soil and fungal plant pathogens in the phyllosphere, while urban areas presented higher proportions of fungal plant pathogens in both the soil and phyllosphere as well as nitrifying and denitrifying bacteria in the phyllosphere, but a lower proportion of cellulolytic bacteria in the soil. Furthermore, in urban areas, more phyllosphere microorganisms were sourced from the soil. Collectively, these results suggest that plant-associated microbiomes change significantly across land-use types, and these patterns are different between aboveground and belowground parts of plants, as well as between bacteria/archaea and fungi. These changes in plant-associated microbiomes across land-use types might have important implications for nutrient cycling, plant health, and ecosystem restoration.
{"title":"Mesquite-associated soil and phyllosphere microbial communities differ across land-use types in drylands","authors":"Sydney Cleavenger, Yongjian Chen, Albert Barberán","doi":"10.1525/elementa.2023.00026","DOIUrl":"https://doi.org/10.1525/elementa.2023.00026","url":null,"abstract":"Plant-associated microbiomes play prominent roles in maintaining plant health and productivity. Here, we characterized the soil and phyllosphere microbiomes associated with mesquite trees in grazing and urban areas compared to natural areas in the arid Southwestern United States. Our results showed that grazing areas were associated with higher phyllosphere fungal richness, while urban areas had higher phyllosphere richness for both fungi and bacteria/archaea, and additionally, urban soils had lower fungal richness. Specifically, grazing areas were characterized by larger proportions of nitrogen-fixing bacteria in the soil and fungal plant pathogens in the phyllosphere, while urban areas presented higher proportions of fungal plant pathogens in both the soil and phyllosphere as well as nitrifying and denitrifying bacteria in the phyllosphere, but a lower proportion of cellulolytic bacteria in the soil. Furthermore, in urban areas, more phyllosphere microorganisms were sourced from the soil. Collectively, these results suggest that plant-associated microbiomes change significantly across land-use types, and these patterns are different between aboveground and belowground parts of plants, as well as between bacteria/archaea and fungi. These changes in plant-associated microbiomes across land-use types might have important implications for nutrient cycling, plant health, and ecosystem restoration.","PeriodicalId":54279,"journal":{"name":"Elementa-Science of the Anthropocene","volume":"69 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135057955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.1525/elementa.2022.00086
J. Barten, L. Ganzeveld, G. Steeneveld, B. Blomquist, H. Angot, S. Archer, L. Bariteau, Ivo Beck, M. Boyer, P. von der Gathen, D. Helmig, D. Howard, J. Hueber, H. Jacobi, T. Jokinen, T. Laurila, Kevin M. Posman, L. Quéléver, J. Schmale, M. Shupe, M. Krol
Dry deposition to the surface is one of the main removal pathways of tropospheric ozone (O3). We quantified for the first time the impact of O3 deposition to the Arctic sea ice on the planetary boundary layer (PBL) O3 concentration and budget using year-round flux and concentration observations from the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) campaign and simulations with a single-column atmospheric chemistry and meteorological model (SCM). Based on eddy-covariance O3 surface flux observations, we find a median surface resistance on the order of 20,000 s m−1, resulting in a dry deposition velocity of approximately 0.005 cm s−1. This surface resistance is up to an order of magnitude larger than traditionally used values in many atmospheric chemistry and transport models. The SCM is able to accurately represent the yearly cycle, with maxima above 40 ppb in the winter and minima around 15 ppb at the end of summer. However, the observed springtime ozone depletion events are not captured by the SCM. In winter, the modelled PBL O3 budget is governed by dry deposition at the surface mostly compensated by downward turbulent transport of O3 towards the surface. Advection, which is accounted for implicitly by nudging to reanalysis data, poses a substantial, mostly negative, contribution to the simulated PBL O3 budget in summer. During episodes with low wind speed (<5 m s−1) and shallow PBL (<50 m), the 7-day mean dry deposition removal rate can reach up to 1.0 ppb h−1. Our study highlights the importance of an accurate description of dry deposition to Arctic sea ice in models to quantify the current and future O3 sink in the Arctic, impacting the tropospheric O3 budget, which has been modified in the last century largely due to anthropogenic activities.
干沉降到地面是对流层臭氧(O3)的主要清除途径之一。利用多学科北极气候漂移观测站(MOSAiC)的全年通量和浓度观测数据，以及单柱大气化学和气象模式(SCM)的模拟，首次量化了O3沉积对北极海冰行星边界层(PBL) O3浓度和收支的影响。基于涡旋协方差O3表面通量观测，我们发现中位表面阻力约为20,000 s m−1，导致干沉积速度约为0.005 cm s−1。这种表面阻力比许多大气化学和输送模型中传统使用的值大一个数量级。SCM能够准确地表示年周期，冬季最大值超过40 ppb，夏末最小值约为15 ppb。然而，观测到的春季臭氧消耗事件没有被SCM捕获。在冬季，模拟的PBL O3收支受地表干沉积控制，主要由O3向地表的向下湍流输送补偿。通过重新分析数据，平流对夏季模拟PBL O3预算的贡献很大，但大部分是负的。在低风速(<5 m s−1)和浅边界层(<50 m)条件下，7天平均干沉降去除率可达1.0 ppb h−1。我们的研究强调了在模式中准确描述干沉积对北极海冰的重要性，以量化北极当前和未来的O3汇，影响对流层O3收支，这在上个世纪主要是由于人为活动而被修改的。
{"title":"Low ozone dry deposition rates to sea ice during the MOSAiC field campaign: Implications for the Arctic boundary layer ozone budget","authors":"J. Barten, L. Ganzeveld, G. Steeneveld, B. Blomquist, H. Angot, S. Archer, L. Bariteau, Ivo Beck, M. Boyer, P. von der Gathen, D. Helmig, D. Howard, J. Hueber, H. Jacobi, T. Jokinen, T. Laurila, Kevin M. Posman, L. Quéléver, J. Schmale, M. Shupe, M. Krol","doi":"10.1525/elementa.2022.00086","DOIUrl":"https://doi.org/10.1525/elementa.2022.00086","url":null,"abstract":"Dry deposition to the surface is one of the main removal pathways of tropospheric ozone (O3). We quantified for the first time the impact of O3 deposition to the Arctic sea ice on the planetary boundary layer (PBL) O3 concentration and budget using year-round flux and concentration observations from the Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC) campaign and simulations with a single-column atmospheric chemistry and meteorological model (SCM). Based on eddy-covariance O3 surface flux observations, we find a median surface resistance on the order of 20,000 s m−1, resulting in a dry deposition velocity of approximately 0.005 cm s−1. This surface resistance is up to an order of magnitude larger than traditionally used values in many atmospheric chemistry and transport models. The SCM is able to accurately represent the yearly cycle, with maxima above 40 ppb in the winter and minima around 15 ppb at the end of summer. However, the observed springtime ozone depletion events are not captured by the SCM. In winter, the modelled PBL O3 budget is governed by dry deposition at the surface mostly compensated by downward turbulent transport of O3 towards the surface. Advection, which is accounted for implicitly by nudging to reanalysis data, poses a substantial, mostly negative, contribution to the simulated PBL O3 budget in summer. During episodes with low wind speed (<5 m s−1) and shallow PBL (<50 m), the 7-day mean dry deposition removal rate can reach up to 1.0 ppb h−1. Our study highlights the importance of an accurate description of dry deposition to Arctic sea ice in models to quantify the current and future O3 sink in the Arctic, impacting the tropospheric O3 budget, which has been modified in the last century largely due to anthropogenic activities.","PeriodicalId":54279,"journal":{"name":"Elementa-Science of the Anthropocene","volume":"1 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66944721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.1525/elementa.2023.00024
Elliot Dreujou, David Beauchesne, Rémi M. Daigle, Julie Carrière, Fanny Noisette, Christopher W. McKindsey, Philippe Archambault
Co-occurring anthropogenic activities influence coastal ecosystems around the world. Notions of ecological exposure are promising indicators to better understand environmental status and enhance ecosystem protection. This study characterized anthropogenic exposure in the context of multiple human activities on coastal benthic ecosystems at a scale of <100 km. Using a particle diffusion model and fishing event data, we developed an exposure index for seven human activities (aquaculture, artificial structures, dredging, fisheries, runoff, sewers and shipping) in a Canadian industrial harbour area. A generally low cumulative exposure was obtained, with the highest values observed directly in front of the city and industrial areas. Derived exposure indices explained a portion of the benthic community structure (R2 = 0.22), suggesting an ecological link between the exposure of species and their vulnerability to human activities. Such tools are relevant in data-poor environments where proxies are required to assess the state of an ecosystem, facilitating the application of ecosystem-based management.
{"title":"Multiple human activities in coastal benthic ecosystems: Introducing a metric of cumulative exposure","authors":"Elliot Dreujou, David Beauchesne, Rémi M. Daigle, Julie Carrière, Fanny Noisette, Christopher W. McKindsey, Philippe Archambault","doi":"10.1525/elementa.2023.00024","DOIUrl":"https://doi.org/10.1525/elementa.2023.00024","url":null,"abstract":"Co-occurring anthropogenic activities influence coastal ecosystems around the world. Notions of ecological exposure are promising indicators to better understand environmental status and enhance ecosystem protection. This study characterized anthropogenic exposure in the context of multiple human activities on coastal benthic ecosystems at a scale of &lt;100 km. Using a particle diffusion model and fishing event data, we developed an exposure index for seven human activities (aquaculture, artificial structures, dredging, fisheries, runoff, sewers and shipping) in a Canadian industrial harbour area. A generally low cumulative exposure was obtained, with the highest values observed directly in front of the city and industrial areas. Derived exposure indices explained a portion of the benthic community structure (R2 = 0.22), suggesting an ecological link between the exposure of species and their vulnerability to human activities. Such tools are relevant in data-poor environments where proxies are required to assess the state of an ecosystem, facilitating the application of ecosystem-based management.","PeriodicalId":54279,"journal":{"name":"Elementa-Science of the Anthropocene","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135495045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.1525/elementa.2023.00037
Douglas S. Hamilton, Alex R. Baker, Yoko Iwamoto, Santiago Gassó, Elisa Bergas-Masso, Sarah Deutch, Julie Dinasquet, Yoshiko Kondo, Joan Llort, Stelios Myriokefalitakis, Morgane M. G. Perron, Alex Wegmann, Joo-Eun Yoon
This perspective piece on aerosol deposition to marine ecosystems and the related impacts on biogeochemical cycles forms part of a larger Surface Ocean Lower Atmosphere Study status-of-the-science special edition. A large body of recent reviews has comprehensively covered different aspects of this topic. Here, we aim to take a fresh approach by reviewing recent research to identify potential foundations for future study. We have purposefully chosen to discuss aerosol nutrient and pollutant fluxes both in terms of the journey that different aerosol particles take and that of the surrounding scientific field exploring them. To do so, we explore some of the major tools, knowledge, and partnerships we believe are required to aid advancing this highly interdisciplinary field of research. We recognize that significant gaps persist in our understanding of how far aerosol deposition modulates marine biogeochemical cycles and thus climate. This uncertainty increases as socioeconomic pressures, climate change, and technological advancements continue to change how we live and interact with the marine environment. Despite this, recent advances in modeling techniques, satellite remote sensing, and field observations have provided valuable insights into the spatial and temporal variability of aerosol deposition across the world’s ocean. With the UN Ocean Decade and sustainable development goals in sight, it becomes essential that the community prioritizes the use of a wide variety of tools, knowledge, and partnerships to advance understanding. It is through a collaborative and sustained effort that we hope the community can address the gaps in our understanding of the complex interactions between aerosol particles, marine ecosystems, and biogeochemical cycles.
{"title":"An aerosol odyssey: Navigating nutrient flux changes to marine ecosystems","authors":"Douglas S. Hamilton, Alex R. Baker, Yoko Iwamoto, Santiago Gassó, Elisa Bergas-Masso, Sarah Deutch, Julie Dinasquet, Yoshiko Kondo, Joan Llort, Stelios Myriokefalitakis, Morgane M. G. Perron, Alex Wegmann, Joo-Eun Yoon","doi":"10.1525/elementa.2023.00037","DOIUrl":"https://doi.org/10.1525/elementa.2023.00037","url":null,"abstract":"This perspective piece on aerosol deposition to marine ecosystems and the related impacts on biogeochemical cycles forms part of a larger Surface Ocean Lower Atmosphere Study status-of-the-science special edition. A large body of recent reviews has comprehensively covered different aspects of this topic. Here, we aim to take a fresh approach by reviewing recent research to identify potential foundations for future study. We have purposefully chosen to discuss aerosol nutrient and pollutant fluxes both in terms of the journey that different aerosol particles take and that of the surrounding scientific field exploring them. To do so, we explore some of the major tools, knowledge, and partnerships we believe are required to aid advancing this highly interdisciplinary field of research. We recognize that significant gaps persist in our understanding of how far aerosol deposition modulates marine biogeochemical cycles and thus climate. This uncertainty increases as socioeconomic pressures, climate change, and technological advancements continue to change how we live and interact with the marine environment. Despite this, recent advances in modeling techniques, satellite remote sensing, and field observations have provided valuable insights into the spatial and temporal variability of aerosol deposition across the world’s ocean. With the UN Ocean Decade and sustainable development goals in sight, it becomes essential that the community prioritizes the use of a wide variety of tools, knowledge, and partnerships to advance understanding. It is through a collaborative and sustained effort that we hope the community can address the gaps in our understanding of the complex interactions between aerosol particles, marine ecosystems, and biogeochemical cycles.","PeriodicalId":54279,"journal":{"name":"Elementa-Science of the Anthropocene","volume":"183 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135560577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.1525/elementa.2023.00012
Meaghan McSorley, Bettina K. Arkhurst, Marjorie Hall, Yilun Zha, Ioanna Maria Spyrou, Katherine Duchesneau, Udita Ringania, Michael Chang
In the face of the climate crisis, is the academy preparing graduate students to engage in the interdisciplinary work needed to create a sustainable future? In 2021, the Brook Byers Institute for Sustainable Systems (BBISS) at the Georgia Institute of Technology convened a group of 7 doctoral students from 7 different disciplines: history, economics, chemical engineering, mechanical engineering, biology, city planning, and architecture. The intent of this program was for students to work on self-directed interdisciplinary projects around sustainability. This article describes our experiences as doctoral students in the interdisciplinary BBISS program. As a result of our participation, we have come to see our research through new disciplinary lenses, which enables us to better understand the impacts of our work from a broader systems perspective. Here, we discuss the challenges of interdisciplinarity in academia and highlight the value we see in strengthening interdisciplinarity in graduate education and research. We believe graduate students can become more effective, collaborative problem-solvers, and be better prepared to lead future sustainability projects when given opportunities to integrate interdisciplinary work into their existing program demands. Graduate education should encourage future scholars to broaden their horizons beyond the boundaries of their disciplines, provide opportunities for students to enhance their capabilities as collaborators and team members, and enable students to meaningfully engage with others in traditionally dissimilar fields to better tackle the increasingly complex sustainability problems we face. Our own experiences in the open-ended, interdisciplinary, multisemester BBISS program are evidence of the value of such programs, and we offer some additional suggestions for how individual programs, schools, colleges, and universities might modify doctoral program requirements to better support interdisciplinary work in graduate education.
{"title":"For graduate students to become leaders in sustainability, we must transcend disciplinary boundaries","authors":"Meaghan McSorley, Bettina K. Arkhurst, Marjorie Hall, Yilun Zha, Ioanna Maria Spyrou, Katherine Duchesneau, Udita Ringania, Michael Chang","doi":"10.1525/elementa.2023.00012","DOIUrl":"https://doi.org/10.1525/elementa.2023.00012","url":null,"abstract":"In the face of the climate crisis, is the academy preparing graduate students to engage in the interdisciplinary work needed to create a sustainable future? In 2021, the Brook Byers Institute for Sustainable Systems (BBISS) at the Georgia Institute of Technology convened a group of 7 doctoral students from 7 different disciplines: history, economics, chemical engineering, mechanical engineering, biology, city planning, and architecture. The intent of this program was for students to work on self-directed interdisciplinary projects around sustainability. This article describes our experiences as doctoral students in the interdisciplinary BBISS program. As a result of our participation, we have come to see our research through new disciplinary lenses, which enables us to better understand the impacts of our work from a broader systems perspective. Here, we discuss the challenges of interdisciplinarity in academia and highlight the value we see in strengthening interdisciplinarity in graduate education and research. We believe graduate students can become more effective, collaborative problem-solvers, and be better prepared to lead future sustainability projects when given opportunities to integrate interdisciplinary work into their existing program demands. Graduate education should encourage future scholars to broaden their horizons beyond the boundaries of their disciplines, provide opportunities for students to enhance their capabilities as collaborators and team members, and enable students to meaningfully engage with others in traditionally dissimilar fields to better tackle the increasingly complex sustainability problems we face. Our own experiences in the open-ended, interdisciplinary, multisemester BBISS program are evidence of the value of such programs, and we offer some additional suggestions for how individual programs, schools, colleges, and universities might modify doctoral program requirements to better support interdisciplinary work in graduate education.","PeriodicalId":54279,"journal":{"name":"Elementa-Science of the Anthropocene","volume":"138 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135710173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.1525/elementa.2022.00096
Beiming Tang, Pablo E. Saide, Meng Gao, Gregory R. Carmichael, Charles O. Stanier
To quantify the relative roles of long-range transport (LRT) versus locally emitted aerosol and ozone precursors during polluted periods in Korea, high-resolution (4 km) Weather Research and Forecasting with Chemistry model simulations were performed. The model was evaluated using surface and airborne observations collected during the KORea and United States Air Quality campaign. Ozone above 40 ppb had mean bias of −5.9 ppb. PM2.5 was biased high (8.2 µg/m3), with a relative bias of 30% given the mean observed value of 26.8 µg/m3. The absolute amounts and shifts between phases for all PM2.5 species except nitrate reasonably match observations across all 4 phases. Notable limitations include an underestimation of nighttime planetary boundary layer height. Transport versus domestic emissions influence was studied by model runs with perturbed emissions and by comparing east-west fluxes over the Yellow Sea to Korean emissions and other normalization metrics. Domestic anthropogenic emission contributions to surface air quality were quantified by location across Korea, segregated by synoptic meteorological phase. The largest contributions from Korean emissions were found under high-pressure stagnant conditions and the smallest for conditions with strong westerly winds. For example, at Seoul, domestic contributions of PM2.5 averaged 49% and 29% in the aforementioned meteorological phases, respectively. Surface concentrations of NOx and toluene in Seoul were over 85% due to domestic emissions. CO and black carbon had both local and remote contributions. Nitrate and ammonium contributions varied greatly by phases in Seoul, with 7%–51% nitrate and 42%–70% of ammonium from remote sources. Variation in direction (west-to-east vs. east-to-west) and magnitude of fluxes support the model sensitivity results. Analysis using fluxes facilitates the quantification of source contributions for secondary species and, in many cases, can be done using a single model run or reanalysis result. The analysis presented shows the importance of using models with high spatial resolution to capture pollutant transport and mixing around Korea. However, there remain uncertainties in secondary aerosol production mechanisms and indications that local production at times could be higher than those modeled in this analysis. Therefore, the results presented here should be viewed as an upper limit on the importance of LRT.
{"title":"WRF-Chem quantification of transport events and emissions sensitivity in Korea during KORUS-AQ","authors":"Beiming Tang, Pablo E. Saide, Meng Gao, Gregory R. Carmichael, Charles O. Stanier","doi":"10.1525/elementa.2022.00096","DOIUrl":"https://doi.org/10.1525/elementa.2022.00096","url":null,"abstract":"To quantify the relative roles of long-range transport (LRT) versus locally emitted aerosol and ozone precursors during polluted periods in Korea, high-resolution (4 km) Weather Research and Forecasting with Chemistry model simulations were performed. The model was evaluated using surface and airborne observations collected during the KORea and United States Air Quality campaign. Ozone above 40 ppb had mean bias of −5.9 ppb. PM2.5 was biased high (8.2 µg/m3), with a relative bias of 30% given the mean observed value of 26.8 µg/m3. The absolute amounts and shifts between phases for all PM2.5 species except nitrate reasonably match observations across all 4 phases. Notable limitations include an underestimation of nighttime planetary boundary layer height. Transport versus domestic emissions influence was studied by model runs with perturbed emissions and by comparing east-west fluxes over the Yellow Sea to Korean emissions and other normalization metrics. Domestic anthropogenic emission contributions to surface air quality were quantified by location across Korea, segregated by synoptic meteorological phase. The largest contributions from Korean emissions were found under high-pressure stagnant conditions and the smallest for conditions with strong westerly winds. For example, at Seoul, domestic contributions of PM2.5 averaged 49% and 29% in the aforementioned meteorological phases, respectively. Surface concentrations of NOx and toluene in Seoul were over 85% due to domestic emissions. CO and black carbon had both local and remote contributions. Nitrate and ammonium contributions varied greatly by phases in Seoul, with 7%–51% nitrate and 42%–70% of ammonium from remote sources. Variation in direction (west-to-east vs. east-to-west) and magnitude of fluxes support the model sensitivity results. Analysis using fluxes facilitates the quantification of source contributions for secondary species and, in many cases, can be done using a single model run or reanalysis result. The analysis presented shows the importance of using models with high spatial resolution to capture pollutant transport and mixing around Korea. However, there remain uncertainties in secondary aerosol production mechanisms and indications that local production at times could be higher than those modeled in this analysis. Therefore, the results presented here should be viewed as an upper limit on the importance of LRT.","PeriodicalId":54279,"journal":{"name":"Elementa-Science of the Anthropocene","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135686300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.1525/elementa.2022.00121
D. Caulton, Priya D. Gurav, A. Robertson, Kristen Pozsonyi, S. Murphy, D. Lyon
There has been increasing interest in quantifying methane (CH4) emissions from a view toward mitigation. Accordingly, ground-based sampling of oil and gas production sites in the Permian Basin was carried out in January and October 2020. Molar ethane to methane ratios (EMRs) were quantified, which may be used to distinguish emissions from particular sources, such as produced gas and oil tank flashing. The geometric mean EMR for 100 observations was 18 (±2)%, while source specific EMRs showed that sites where emissions were attributed to a tank produced much higher EMRs averaging 47%. Sites with other noticeable sources such as compressors, pneumatics, and separators had lower and less variable EMRs. Tanks displayed distinct behavior with EMRs between 10% and 21% producing CH4 emissions >30× higher than tanks with EMRs >21%. This observation supports the hypothesis that high emission rate tank sources are often caused by separator malfunctions that leak produced gas through liquids storage tanks.
{"title":"Abnormal tank emissions in the Permian Basin identified using ethane to methane ratios","authors":"D. Caulton, Priya D. Gurav, A. Robertson, Kristen Pozsonyi, S. Murphy, D. Lyon","doi":"10.1525/elementa.2022.00121","DOIUrl":"https://doi.org/10.1525/elementa.2022.00121","url":null,"abstract":"There has been increasing interest in quantifying methane (CH4) emissions from a view toward mitigation. Accordingly, ground-based sampling of oil and gas production sites in the Permian Basin was carried out in January and October 2020. Molar ethane to methane ratios (EMRs) were quantified, which may be used to distinguish emissions from particular sources, such as produced gas and oil tank flashing. The geometric mean EMR for 100 observations was 18 (±2)%, while source specific EMRs showed that sites where emissions were attributed to a tank produced much higher EMRs averaging 47%. Sites with other noticeable sources such as compressors, pneumatics, and separators had lower and less variable EMRs. Tanks displayed distinct behavior with EMRs between 10% and 21% producing CH4 emissions >30× higher than tanks with EMRs >21%. This observation supports the hypothesis that high emission rate tank sources are often caused by separator malfunctions that leak produced gas through liquids storage tanks.","PeriodicalId":54279,"journal":{"name":"Elementa-Science of the Anthropocene","volume":"24 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66945207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.1525/elementa.2022.00114
Mónica E. Riojas-López, E. Mellink
Before the 16th century, tunales, majestic forests of arborescent nopales (Opuntia spp.), were a signature of the southern part of the Mexican Plateau. They were crucial for nonagricultural humans and wildlife and created the cultural identity of the region. Notwithstanding this, they have been drastically reduced and disparaged into modern times. We aimed at reconstructing the history of the disappearance of these tunales and elaborate on the ecological and cultural impacts of such disappearance. The historicizing of such processes is critical to establish restoration objectives concordant with ecological timeframes, rather than by human memory. To fulfill our objective, we reviewed published formal and gray literature (i.e., publications with limited circulation, theses), and unpublished archival documents, complementing this information and interpreting it with our own >25-year research experience each in the region. Despite some differing opinions, most 15th-century tunales were natural. Agricultural development in the 17th–19th centuries affected mostly tunales in humid bottomlands. Those on hills and slopes apparently escaped this initial transformation. After the Mexican Revolution (1910–1921), the plowing of hills and slopes destroyed many remaining tunales. Some persisted into the 21th century, but their felling has continued. Our study exemplifies how natural iconic communities once widely distributed can vanish almost inadvertently. With the loss of the tunales, the region has lost a unique, iconic plant community which harbored several plant species endemic to Mexico. Arborescent nopales are hardy, but to avoid the complete disappearance of the tunales, their ecological and biocultural importance and significance must be revaluated, and strong lobbying efforts and management actions developed.
{"title":"Vanishing of the mighty tunales of central Mexico: A 5-century history of landscape change","authors":"Mónica E. Riojas-López, E. Mellink","doi":"10.1525/elementa.2022.00114","DOIUrl":"https://doi.org/10.1525/elementa.2022.00114","url":null,"abstract":"Before the 16th century, tunales, majestic forests of arborescent nopales (Opuntia spp.), were a signature of the southern part of the Mexican Plateau. They were crucial for nonagricultural humans and wildlife and created the cultural identity of the region. Notwithstanding this, they have been drastically reduced and disparaged into modern times. We aimed at reconstructing the history of the disappearance of these tunales and elaborate on the ecological and cultural impacts of such disappearance. The historicizing of such processes is critical to establish restoration objectives concordant with ecological timeframes, rather than by human memory. To fulfill our objective, we reviewed published formal and gray literature (i.e., publications with limited circulation, theses), and unpublished archival documents, complementing this information and interpreting it with our own >25-year research experience each in the region. Despite some differing opinions, most 15th-century tunales were natural. Agricultural development in the 17th–19th centuries affected mostly tunales in humid bottomlands. Those on hills and slopes apparently escaped this initial transformation. After the Mexican Revolution (1910–1921), the plowing of hills and slopes destroyed many remaining tunales. Some persisted into the 21th century, but their felling has continued. Our study exemplifies how natural iconic communities once widely distributed can vanish almost inadvertently. With the loss of the tunales, the region has lost a unique, iconic plant community which harbored several plant species endemic to Mexico. Arborescent nopales are hardy, but to avoid the complete disappearance of the tunales, their ecological and biocultural importance and significance must be revaluated, and strong lobbying efforts and management actions developed.","PeriodicalId":54279,"journal":{"name":"Elementa-Science of the Anthropocene","volume":"1 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66944876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.1525/elementa.2022.00035
E. Salganik, C. Katlein, B. Lange, I. Matero, R. Lei, A. Fong, S. Fons, D. Divine, M. Oggier, G. Castellani, Deborah Bozzato, E. J. Chamberlain, C. Hoppe, O. Müller, J. Gardner, A. Rinke, P. Pereira, Adam Ulfsbo, C. Marsay, M. Webster, S. Maus, K. Høyland, M. Granskog
Low-salinity meltwater from Arctic sea ice and its snow cover accumulates and creates under-ice meltwater layers below sea ice. These meltwater layers can result in the formation of new ice layers, or false bottoms, at the interface of this low-salinity meltwater and colder seawater. As part of the Multidisciplinary drifting Observatory for the Study of the Arctic Climate (MOSAiC), we used a combination of sea ice coring, temperature profiles from thermistor strings and underwater multibeam sonar surveys with a remotely operated vehicle (ROV) to study the areal coverage and temporal evolution of under-ice meltwater layers and false bottoms during the summer melt season from mid-June until late July. ROV surveys indicated that the areal coverage of false bottoms for a part of the MOSAiC Central Observatory (350 by 200 m2) was 21%. Presence of false bottoms reduced bottom ice melt by 7–8% due to the local decrease in the ocean heat flux, which can be described by a thermodynamic model. Under-ice meltwater layer thickness was larger below first-year ice and thinner below thicker second-year ice. We also found that thick ice and ridge keels confined the areas in which under-ice meltwater accumulated, preventing its mixing with underlying seawater. While a thermodynamic model could reproduce false bottom growth and melt, it could not describe the observed bottom melt rates of the ice above false bottoms. We also show that the evolution of under-ice meltwater-layer salinity below first-year ice is linked to brine flushing from the above sea ice and accumulating in the meltwater layer above the false bottom. The results of this study aid in estimating the contribution of under-ice meltwater layers and false bottoms to the mass balance and salt budget for Arctic summer sea ice.
{"title":"Temporal evolution of under-ice meltwater layers and false bottoms and their impact on summer Arctic sea ice mass balance","authors":"E. Salganik, C. Katlein, B. Lange, I. Matero, R. Lei, A. Fong, S. Fons, D. Divine, M. Oggier, G. Castellani, Deborah Bozzato, E. J. Chamberlain, C. Hoppe, O. Müller, J. Gardner, A. Rinke, P. Pereira, Adam Ulfsbo, C. Marsay, M. Webster, S. Maus, K. Høyland, M. Granskog","doi":"10.1525/elementa.2022.00035","DOIUrl":"https://doi.org/10.1525/elementa.2022.00035","url":null,"abstract":"Low-salinity meltwater from Arctic sea ice and its snow cover accumulates and creates under-ice meltwater layers below sea ice. These meltwater layers can result in the formation of new ice layers, or false bottoms, at the interface of this low-salinity meltwater and colder seawater. As part of the Multidisciplinary drifting Observatory for the Study of the Arctic Climate (MOSAiC), we used a combination of sea ice coring, temperature profiles from thermistor strings and underwater multibeam sonar surveys with a remotely operated vehicle (ROV) to study the areal coverage and temporal evolution of under-ice meltwater layers and false bottoms during the summer melt season from mid-June until late July. ROV surveys indicated that the areal coverage of false bottoms for a part of the MOSAiC Central Observatory (350 by 200 m2) was 21%. Presence of false bottoms reduced bottom ice melt by 7–8% due to the local decrease in the ocean heat flux, which can be described by a thermodynamic model. Under-ice meltwater layer thickness was larger below first-year ice and thinner below thicker second-year ice. We also found that thick ice and ridge keels confined the areas in which under-ice meltwater accumulated, preventing its mixing with underlying seawater. While a thermodynamic model could reproduce false bottom growth and melt, it could not describe the observed bottom melt rates of the ice above false bottoms. We also show that the evolution of under-ice meltwater-layer salinity below first-year ice is linked to brine flushing from the above sea ice and accumulating in the meltwater layer above the false bottom. The results of this study aid in estimating the contribution of under-ice meltwater layers and false bottoms to the mass balance and salt budget for Arctic summer sea ice.","PeriodicalId":54279,"journal":{"name":"Elementa-Science of the Anthropocene","volume":"24 1","pages":""},"PeriodicalIF":3.9,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66943862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-01DOI: 10.1525/elementa.2023.00056
Megan D. Willis, Delphine Lannuzel, Brent Else, Hélène Angot, Karley Campbell, Odile Crabeck, Bruno Delille, Hakase Hayashida, Martine Lizotte, Brice Loose, Klaus M. Meiners, Lisa Miller, Sebastien Moreau, Daiki Nomura, John Prytherch, Julia Schmale, Nadja Steiner, Letizia Tedesco, Jennie Thomas
Polar oceans and sea ice cover 15% of the Earth’s ocean surface, and the environment is changing rapidly at both poles. Improving knowledge on the interactions between the atmospheric and oceanic realms in the polar regions, a Surface Ocean–Lower Atmosphere Study (SOLAS) project key focus, is essential to understanding the Earth system in the context of climate change. However, our ability to monitor the pace and magnitude of changes in the polar regions and evaluate their impacts for the rest of the globe is limited by both remoteness and sea-ice coverage. Sea ice not only supports biological activity and mediates gas and aerosol exchange but can also hinder some in-situ and remote sensing observations. While satellite remote sensing provides the baseline climate record for sea-ice properties and extent, these techniques cannot provide key variables within and below sea ice. Recent robotics, modeling, and in-situ measurement advances have opened new possibilities for understanding the ocean–sea ice–atmosphere system, but critical knowledge gaps remain. Seasonal and long-term observations are clearly lacking across all variables and phases. Observational and modeling efforts across the sea-ice, ocean, and atmospheric domains must be better linked to achieve a system-level understanding of polar ocean and sea-ice environments. As polar oceans are warming and sea ice is becoming thinner and more ephemeral than before, dramatic changes over a suite of physicochemical and biogeochemical processes are expected, if not already underway. These changes in sea-ice and ocean conditions will affect atmospheric processes by modifying the production of aerosols, aerosol precursors, reactive halogens and oxidants, and the exchange of greenhouse gases. Quantifying which processes will be enhanced or reduced by climate change calls for tailored monitoring programs for high-latitude ocean environments. Open questions in this coupled system will be best resolved by leveraging ongoing international and multidisciplinary programs, such as efforts led by SOLAS, to link research across the ocean–sea ice–atmosphere interface.
{"title":"Polar oceans and sea ice in a changing climate","authors":"Megan D. Willis, Delphine Lannuzel, Brent Else, Hélène Angot, Karley Campbell, Odile Crabeck, Bruno Delille, Hakase Hayashida, Martine Lizotte, Brice Loose, Klaus M. Meiners, Lisa Miller, Sebastien Moreau, Daiki Nomura, John Prytherch, Julia Schmale, Nadja Steiner, Letizia Tedesco, Jennie Thomas","doi":"10.1525/elementa.2023.00056","DOIUrl":"https://doi.org/10.1525/elementa.2023.00056","url":null,"abstract":"Polar oceans and sea ice cover 15% of the Earth’s ocean surface, and the environment is changing rapidly at both poles. Improving knowledge on the interactions between the atmospheric and oceanic realms in the polar regions, a Surface Ocean–Lower Atmosphere Study (SOLAS) project key focus, is essential to understanding the Earth system in the context of climate change. However, our ability to monitor the pace and magnitude of changes in the polar regions and evaluate their impacts for the rest of the globe is limited by both remoteness and sea-ice coverage. Sea ice not only supports biological activity and mediates gas and aerosol exchange but can also hinder some in-situ and remote sensing observations. While satellite remote sensing provides the baseline climate record for sea-ice properties and extent, these techniques cannot provide key variables within and below sea ice. Recent robotics, modeling, and in-situ measurement advances have opened new possibilities for understanding the ocean–sea ice–atmosphere system, but critical knowledge gaps remain. Seasonal and long-term observations are clearly lacking across all variables and phases. Observational and modeling efforts across the sea-ice, ocean, and atmospheric domains must be better linked to achieve a system-level understanding of polar ocean and sea-ice environments. As polar oceans are warming and sea ice is becoming thinner and more ephemeral than before, dramatic changes over a suite of physicochemical and biogeochemical processes are expected, if not already underway. These changes in sea-ice and ocean conditions will affect atmospheric processes by modifying the production of aerosols, aerosol precursors, reactive halogens and oxidants, and the exchange of greenhouse gases. Quantifying which processes will be enhanced or reduced by climate change calls for tailored monitoring programs for high-latitude ocean environments. Open questions in this coupled system will be best resolved by leveraging ongoing international and multidisciplinary programs, such as efforts led by SOLAS, to link research across the ocean–sea ice–atmosphere interface.","PeriodicalId":54279,"journal":{"name":"Elementa-Science of the Anthropocene","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135057726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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