Quaternary Science Reviews最新文献

Millennial- to centennial-scale Atlantic ITCZ swings during the penultimate deglaciation

IF 3.2 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2024-11-30 DOI: 10.1016/j.quascirev.2024.109095

Marília C. Campos , Cristiano M. Chiessi , Rodrigo A. Nascimento , Laura Kraft , Svetlana Radionovskaya , Luke Skinner , Bruna B. Dias , Tainã M.L. Pinho , Marcus V.L. Kochhann , Stefano Crivellari , Thays D. Mineli , Vinícius R. Mendes , Paul A. Baker , Cleverson G. Silva , André O. Sawakuchi

Growing concerns surround the future of the Atlantic Meridional Overturning Circulation (AMOC) and its impacts on tropical regions, particularly due to changes in the dynamics of the Intertropical Convergence Zone (ITCZ). Northeastern Brazil, a tropical region strongly influenced by ITCZ dynamics, exhibits significant biological and social vulnerability to climate change, making it timely to understand how its hydroclimate could be impacted by AMOC changes in the face of anthropogenic global warming. The penultimate deglaciation was marked by a millennial-scale weak AMOC event called Heinrich stadial 11 (HS11; ∼136-129 ka), providing an instructive target interval for improving our understanding of Northeastern Brazil hydroclimate responses to climate change. Here, we reconstruct paleoclimate changes during HS11 based on a multi-proxy approach applied to a high-resolution marine core from the western equatorial Atlantic. Our results suggest that HS11 was marked by a southward shift of the ITCZ, evidenced by paleoprecipitation records showing increased precipitation over Northeastern Brazil. These changes were concurrent with increased sea surface temperatures and reduced bottom water ventilation in the western equatorial Atlantic, interpreted as consequences of a weak AMOC. Importantly, we identified centennial-scale events within HS11, which are similar in nature but smaller in magnitude than HS11. These events align with North Atlantic climate changes, highlighting the crucial role that not only millennial- but also centennial-scale AMOC variability may play in low latitudes. Our findings raise concerns about the potential future impacts that an AMOC weakening may have on the hydroclimate of Northeastern Brazil and other tropical regions.

{"title":"Millennial- to centennial-scale Atlantic ITCZ swings during the penultimate deglaciation","authors":"Marília C. Campos , Cristiano M. Chiessi , Rodrigo A. Nascimento , Laura Kraft , Svetlana Radionovskaya , Luke Skinner , Bruna B. Dias , Tainã M.L. Pinho , Marcus V.L. Kochhann , Stefano Crivellari , Thays D. Mineli , Vinícius R. Mendes , Paul A. Baker , Cleverson G. Silva , André O. Sawakuchi","doi":"10.1016/j.quascirev.2024.109095","DOIUrl":"10.1016/j.quascirev.2024.109095","url":null,"abstract":"<div><div>Growing concerns surround the future of the Atlantic Meridional Overturning Circulation (AMOC) and its impacts on tropical regions, particularly due to changes in the dynamics of the Intertropical Convergence Zone (ITCZ). Northeastern Brazil, a tropical region strongly influenced by ITCZ dynamics, exhibits significant biological and social vulnerability to climate change, making it timely to understand how its hydroclimate could be impacted by AMOC changes in the face of anthropogenic global warming. The penultimate deglaciation was marked by a millennial-scale weak AMOC event called Heinrich stadial 11 (HS11; ∼136-129 ka), providing an instructive target interval for improving our understanding of Northeastern Brazil hydroclimate responses to climate change. Here, we reconstruct paleoclimate changes during HS11 based on a multi-proxy approach applied to a high-resolution marine core from the western equatorial Atlantic. Our results suggest that HS11 was marked by a southward shift of the ITCZ, evidenced by paleoprecipitation records showing increased precipitation over Northeastern Brazil. These changes were concurrent with increased sea surface temperatures and reduced bottom water ventilation in the western equatorial Atlantic, interpreted as consequences of a weak AMOC. Importantly, we identified centennial-scale events within HS11, which are similar in nature but smaller in magnitude than HS11. These events align with North Atlantic climate changes, highlighting the crucial role that not only millennial- but also centennial-scale AMOC variability may play in low latitudes. Our findings raise concerns about the potential future impacts that an AMOC weakening may have on the hydroclimate of Northeastern Brazil and other tropical regions.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"348 ","pages":"Article 109095"},"PeriodicalIF":3.2,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142756583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

12,000 years away from the sea: Long-term circulation of Pacific shells in the Semiarid North of Chile (South America)

IF 3.2 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2024-11-30 DOI: 10.1016/j.quascirev.2024.109112

Daniel Hernández Castillo , Andrés Troncoso , César Méndez , Daniel Pascual , Felipe Armstrong , Amalia Nuevo-Delaunay , Sebastián Grasset , Isidora Pérez , Francisca Vera , Manuela Delgado , Antonia Escudero , Mariela Pino , Pablo Larach

Marine resources provide a baseline for understanding the sociohistorical trajectories of Andean societies using Pacific coastal environments. This study examines seashell distributions in northern Chile's semiarid region, revealing inland circulation patterns established over twelve thousand years. This included an extensive review of published information and new data assessed through GIS and least-cost paths. Sorting 950 specimens from 32 sites into 32 taxa, we identified consistent mobility patterns across time periods. In addition to the primary west-east trajectory from the sea to the interior, a secondary north-south inland vector was in use since the early Holocene. This study also revealed intensified shell transport during the middle Holocene, and a shift toward down-the-line exchange with reduced shell frequency at interior sites by the late Holocene, particularly in the Limarí Valley. Additionally, shell artifacts - ornaments and tools - were found more consistently in interior contexts. Together, these findings shed light on long-term human adaptation strategies in semiarid mountainous environments.

{"title":"12,000 years away from the sea: Long-term circulation of Pacific shells in the Semiarid North of Chile (South America)","authors":"Daniel Hernández Castillo , Andrés Troncoso , César Méndez , Daniel Pascual , Felipe Armstrong , Amalia Nuevo-Delaunay , Sebastián Grasset , Isidora Pérez , Francisca Vera , Manuela Delgado , Antonia Escudero , Mariela Pino , Pablo Larach","doi":"10.1016/j.quascirev.2024.109112","DOIUrl":"10.1016/j.quascirev.2024.109112","url":null,"abstract":"<div><div>Marine resources provide a baseline for understanding the sociohistorical trajectories of Andean societies using Pacific coastal environments. This study examines seashell distributions in northern Chile's semiarid region, revealing inland circulation patterns established over twelve thousand years. This included an extensive review of published information and new data assessed through GIS and least-cost paths. Sorting 950 specimens from 32 sites into 32 taxa, we identified consistent mobility patterns across time periods. In addition to the primary west-east trajectory from the sea to the interior, a secondary north-south inland vector was in use since the early Holocene. This study also revealed intensified shell transport during the middle Holocene, and a shift toward down-the-line exchange with reduced shell frequency at interior sites by the late Holocene, particularly in the Limarí Valley. Additionally, shell artifacts - ornaments and tools - were found more consistently in interior contexts. Together, these findings shed light on long-term human adaptation strategies in semiarid mountainous environments.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"348 ","pages":"Article 109112"},"PeriodicalIF":3.2,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Testate amoebae as paleohydrological indicators in the boreal and subarctic permafrost mires in the western part of the central Siberian Plateau

IF 3.2 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2024-11-29 DOI: 10.1016/j.quascirev.2024.109108

Xiuyuan Gu , Andrey N. Tsyganov , Natalia G. Mazei , Kirill V. Babeshko , Victor A. Chernyshov , Elena Yu Novenko , Yuri A. Mazei

Carbon storage capacity of peat deposits in permafrost mires is highly sensitive to climate change which effects might be strongly mediated by mire moisture and permafrost. Thus, it is essential to develop appropriate indicator tools of hydrological regime which can be used for monitoring present and past conditions in these mires. We use testate amoebae to investigate their indicator value to water table depth (WTD) and substrate water content (SWC) and to develop transfer functions for quantitative reconstructions of these environmental characteristics in the permafrost mires on the Central Siberian Plateau. In many cased, direct measurement of WTD in permafrost mires are not possible due to the presence of ice, so that SWC can be used as an alternative characteristic. Overall, 330 surface samples were collected in five study regions together with the corresponding environmental measurements. We find that testate amoebae form diverse assemblages with the species structure strongly controlled by WTD and SWC. We developed two testate amoeba-based transfer functions to reconstruct these characteristics based on Modern Analogue Technique which were assessed using leave-one-out and bootstrap cross-validation. We find that both transfer functions have good predictive power (for WTD: RMSEP = 6.8–7.6 cm, R² = 0.54, for SWC: RMSEP = 2.0–2.3 %, R² = 0.74–0.76). The ecological preferences of the majority of testate amoebae were similar to those reported by the studies in lower-latitudes, although some hydrophilic taxa were observed in the drier end of the surface wetness gradient. These data represent an important source for improvement of quantitative reconstructions based on subfossil testate amoebae in permafrost mires.

{"title":"Testate amoebae as paleohydrological indicators in the boreal and subarctic permafrost mires in the western part of the central Siberian Plateau","authors":"Xiuyuan Gu , Andrey N. Tsyganov , Natalia G. Mazei , Kirill V. Babeshko , Victor A. Chernyshov , Elena Yu Novenko , Yuri A. Mazei","doi":"10.1016/j.quascirev.2024.109108","DOIUrl":"10.1016/j.quascirev.2024.109108","url":null,"abstract":"<div><div>Carbon storage capacity of peat deposits in permafrost mires is highly sensitive to climate change which effects might be strongly mediated by mire moisture and permafrost. Thus, it is essential to develop appropriate indicator tools of hydrological regime which can be used for monitoring present and past conditions in these mires. We use testate amoebae to investigate their indicator value to water table depth (WTD) and substrate water content (SWC) and to develop transfer functions for quantitative reconstructions of these environmental characteristics in the permafrost mires on the Central Siberian Plateau. In many cased, direct measurement of WTD in permafrost mires are not possible due to the presence of ice, so that SWC can be used as an alternative characteristic. Overall, 330 surface samples were collected in five study regions together with the corresponding environmental measurements. We find that testate amoebae form diverse assemblages with the species structure strongly controlled by WTD and SWC. We developed two testate amoeba-based transfer functions to reconstruct these characteristics based on Modern Analogue Technique which were assessed using leave-one-out and bootstrap cross-validation. We find that both transfer functions have good predictive power (for WTD: RMSEP = 6.8–7.6 cm, R<sup>2</sup> = 0.54, for SWC: RMSEP = 2.0–2.3 %, R<sup>2</sup> = 0.74–0.76). The ecological preferences of the majority of testate amoebae were similar to those reported by the studies in lower-latitudes, although some hydrophilic taxa were observed in the drier end of the surface wetness gradient. These data represent an important source for improvement of quantitative reconstructions based on subfossil testate amoebae in permafrost mires.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"349 ","pages":"Article 109108"},"PeriodicalIF":3.2,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745074","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Radiocarbon constraints on North Indian deep ocean ventilation and deglacial carbon dioxide release

IF 3.2 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2024-11-29 DOI: 10.1016/j.quascirev.2024.109116

Sui Wan , Yan Du , Lanlan Zhang , Liang Yi , Haowen Dang , Xiang Su , Jianguo Liu , Yiping Yang , Haoyin Wang , Rong Xiang

Late Quaternary Indian Ocean circulation evolution and its role in carbon cycle dynamics remain poorly constrained. Here, we reconstructed the radiocarbon ventilation history of the North Indian Ocean over the past 30 kyr BP, using core I106 at the Ninetyeast Ridge. The results show higher ¹⁴C ventilation ages (Benthic-Atmospheric ¹⁴C offsets reaching ∼3000 yrs in average) during the last glacial period than nowadays, indicating that deep-water ventilation of the glacial North Indian Ocean was reduced and Indian Deep Waters (IDWs) were part of the glacial aged carbon pool. They also present a rapid rise in ventilation of IDWs during late Heinrich Stadial 1 and the Younger Dryas event, consistent with existing stable isotope data and Nd isotope trends that imply an enhanced inflow of well-ventilated, low-CO₂ North Atlantic Deep Water (NADW) into the North Indian Ocean. The increase in ventilation of IDWs and NADW incursion would have caused a shift of the deep-ocean carbon pool with evidence of degassing from the North Indian Ocean. Together with ¹⁴C ventilation records in the Indian sector of the Southern Ocean, it can be inferred that portions of deep Indian Ocean carbon pool were likely transferred via the IDW transport southward and subsequently released to the atmosphere from the Southern Ocean. These findings highlight that part of ¹⁴C-depleted, CO₂-rich IDWs contributed to the rapid rise in deglacial atmospheric CO₂ via a Southern Ocean link.

{"title":"Radiocarbon constraints on North Indian deep ocean ventilation and deglacial carbon dioxide release","authors":"Sui Wan , Yan Du , Lanlan Zhang , Liang Yi , Haowen Dang , Xiang Su , Jianguo Liu , Yiping Yang , Haoyin Wang , Rong Xiang","doi":"10.1016/j.quascirev.2024.109116","DOIUrl":"10.1016/j.quascirev.2024.109116","url":null,"abstract":"<div><div>Late Quaternary Indian Ocean circulation evolution and its role in carbon cycle dynamics remain poorly constrained. Here, we reconstructed the radiocarbon ventilation history of the North Indian Ocean over the past 30 kyr BP, using core I106 at the Ninetyeast Ridge. The results show higher <sup>14</sup>C ventilation ages (Benthic-Atmospheric <sup>14</sup>C offsets reaching ∼3000 yrs in average) during the last glacial period than nowadays, indicating that deep-water ventilation of the glacial North Indian Ocean was reduced and Indian Deep Waters (IDWs) were part of the glacial aged carbon pool. They also present a rapid rise in ventilation of IDWs during late Heinrich Stadial 1 and the Younger Dryas event, consistent with existing stable isotope data and Nd isotope trends that imply an enhanced inflow of well-ventilated, low-CO<sub>2</sub> North Atlantic Deep Water (NADW) into the North Indian Ocean. The increase in ventilation of IDWs and NADW incursion would have caused a shift of the deep-ocean carbon pool with evidence of degassing from the North Indian Ocean. Together with <sup>14</sup>C ventilation records in the Indian sector of the Southern Ocean, it can be inferred that portions of deep Indian Ocean carbon pool were likely transferred via the IDW transport southward and subsequently released to the atmosphere from the Southern Ocean. These findings highlight that part of <sup>14</sup>C-depleted, CO<sub>2</sub>-rich IDWs contributed to the rapid rise in deglacial atmospheric CO<sub>2</sub> via a Southern Ocean link.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"349 ","pages":"Article 109116"},"PeriodicalIF":3.2,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reply to: A commentary on Holocene relative sea-level histories of far-field islands in the mid-Pacific

IF 3.2 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2024-11-28 DOI: 10.1016/j.quascirev.2024.109097

Fangyi Tan , Aron J. Meltzner , Tanghua Li , Jędrzej M. Majewski , Nicole S. Khan , Peter M. Chutcharavan , Benjamin P. Horton

引用次数: 0

Reconstructing the 800,000-year history of C4 herbs on the Chinese loess plateau using n-alkane carbon isotopes

IF 3.2 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2024-11-28 DOI: 10.1016/j.quascirev.2024.109107

Pu Zhang , Weiguo Liu , Hong Yang

C₄ plants constitute a critical component in the modern ecosystem on the semi-arid Chinese Loess Plateau (CLP), and the changes in their abundances and distributions on geological time scales in response to climate factors such as temperature, precipitation, and atmospheric CO₂ are a subject of intense investigation and debate. Reliable reconstruction of the percentage of C₄ plants and a better understanding of its long-term variations in association with environmental and climatic changes are essential for interpretation of terrestrial ecosystem evolution. In this paper, we determine the carbon isotope and biomass characteristics of leaf wax on the CLP. We identify Bothriochloa ischaemum (L.) Keng as the dominant C₄ grass, which accounts for ∼90% of the total C₄ grass biomass and an average of 70% of the herbaceous community in the area. Using CO₂ and precipitation corrected carbon isotope compositions from leaf wax n-alkanes as a proxy, we reconstruct a continuous history of C₄ vegetation changes on the CLP during the Pleistocene. Our data indicate that a persistent grassland ecosystem existed on the tableland of the CLP, with C₄ plants accounting for up to 40–53% during interglacial phases and 24–40% during glacial phases. Our findings suggest that temperature and precipitation, influenced by the East Asian monsoon, are key factors affecting the abundance of C₄ vegetation in the region. The interactions with the monsoonal climate with warm-season precipitation in this grassland ecosystem throughout the past eight glacial cycles have important implications for the inhabitation of ancient humans in this region and underscore the challenges of vegetation restoration on the CLP under the projected warmer climate in the near future.

{"title":"Reconstructing the 800,000-year history of C4 herbs on the Chinese loess plateau using n-alkane carbon isotopes","authors":"Pu Zhang , Weiguo Liu , Hong Yang","doi":"10.1016/j.quascirev.2024.109107","DOIUrl":"10.1016/j.quascirev.2024.109107","url":null,"abstract":"<div><div>C<sub>4</sub> plants constitute a critical component in the modern ecosystem on the semi-arid Chinese Loess Plateau (CLP), and the changes in their abundances and distributions on geological time scales in response to climate factors such as temperature, precipitation, and atmospheric CO<sub>2</sub> are a subject of intense investigation and debate. Reliable reconstruction of the percentage of C<sub>4</sub> plants and a better understanding of its long-term variations in association with environmental and climatic changes are essential for interpretation of terrestrial ecosystem evolution. In this paper, we determine the carbon isotope and biomass characteristics of leaf wax on the CLP. We identify <em>Bothriochloa ischaemum</em> (L.) Keng as the dominant C<sub>4</sub> grass, which accounts for ∼90% of the total C<sub>4</sub> grass biomass and an average of 70% of the herbaceous community in the area. Using CO<sub>2</sub> and precipitation corrected carbon isotope compositions from leaf wax <em>n</em>-alkanes as a proxy, we reconstruct a continuous history of C<sub>4</sub> vegetation changes on the CLP during the Pleistocene. Our data indicate that a persistent grassland ecosystem existed on the tableland of the CLP, with C<sub>4</sub> plants accounting for up to 40–53% during interglacial phases and 24–40% during glacial phases. Our findings suggest that temperature and precipitation, influenced by the East Asian monsoon, are key factors affecting the abundance of C<sub>4</sub> vegetation in the region. The interactions with the monsoonal climate with warm-season precipitation in this grassland ecosystem throughout the past eight glacial cycles have important implications for the inhabitation of ancient humans in this region and underscore the challenges of vegetation restoration on the CLP under the projected warmer climate in the near future.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"348 ","pages":"Article 109107"},"PeriodicalIF":3.2,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Erosion-weathering partitioning from paired-mineral and weathering-corrected cosmogenic nuclide approaches

IF 3.2 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2024-11-28 DOI: 10.1016/j.quascirev.2024.109114

Richard F. Ott , Florian Kober , Susan Ivy-Ochs , Dirk Scherler , Friedhelm von Blanckenburg , Marcus Christl , Christoph Vockenhuber

Chemical weathering can bias the interpretation of cosmogenic nuclide measurements for denudation rates, because soluble minerals have shorter regolith residence times than insoluble minerals. Paired-mineral measurements in target minerals with different solubility and corrections based on stream-water-derived weathering rates theoretically offer ways to mitigate these biases. Here we test these approaches in the carbonate landscapes of the Tabular Jura and Black Forest in Switzerland and Germany. We measured 26 ³⁶Cl and ¹⁰Be concentrations for catchment-average denudation rates in calcite and quartz grains, respectively, and derive weathering rates from stream water chemistry along a denudation rate gradient. In catchments with homogeneous lithology, the ¹⁰Be-³⁶Cl paired-mineral approach predicts weathering rates that agree with stream-water derived measurements. In catchments with heterogeneous lithology, stream-water derived weathering rates were used to correct ¹⁰Be and ³⁶Cl denudation rates. Weathering-corrected denudation rates increase by 100% for ¹⁰Be and decrease by 5% for ³⁶Cl compared to uncorrected ones, illustrating that the magnitude of weathering correction depends on the abundance of target minerals.

We find denudation rates of 50–100 mm/ka on the low relief carbonate-dominated Bözberg plateau and intermediate relief incised carbonate valleys of the Randen, where weathering accounts for about 75% and 50% of the denudation, respectively. Along the Bözberg plateau flanks and the mid-relief Wutach tributaries denudation rates range between 100 and 200 mm/ka, with erosion and weathering each contributing about 50%. In the rapidly incising Wutach gorge, denudation rates are 300–500 mm/ka with less than 20% of weathering. These findings show that, similarly to crystalline rocks, the fraction of weathering in mixed sedimentary rocks inversely scales with denudation rate. Our study demonstrates that when sampling sites are chosen to ensure that target minerals are sourced from the same area, paired-mineral measurements and stream-water weathering corrections can be effectively used to determine denudation and weathering rates.

{"title":"Erosion-weathering partitioning from paired-mineral and weathering-corrected cosmogenic nuclide approaches","authors":"Richard F. Ott , Florian Kober , Susan Ivy-Ochs , Dirk Scherler , Friedhelm von Blanckenburg , Marcus Christl , Christoph Vockenhuber","doi":"10.1016/j.quascirev.2024.109114","DOIUrl":"10.1016/j.quascirev.2024.109114","url":null,"abstract":"<div><div>Chemical weathering can bias the interpretation of cosmogenic nuclide measurements for denudation rates, because soluble minerals have shorter regolith residence times than insoluble minerals. Paired-mineral measurements in target minerals with different solubility and corrections based on stream-water-derived weathering rates theoretically offer ways to mitigate these biases. Here we test these approaches in the carbonate landscapes of the Tabular Jura and Black Forest in Switzerland and Germany. We measured 26 <sup>36</sup>Cl and <sup>10</sup>Be concentrations for catchment-average denudation rates in calcite and quartz grains, respectively, and derive weathering rates from stream water chemistry along a denudation rate gradient. In catchments with homogeneous lithology, the <sup>10</sup>Be-<sup>36</sup>Cl paired-mineral approach predicts weathering rates that agree with stream-water derived measurements. In catchments with heterogeneous lithology, stream-water derived weathering rates were used to correct <sup>10</sup>Be and <sup>36</sup>Cl denudation rates. Weathering-corrected denudation rates increase by 100% for <sup>10</sup>Be and decrease by 5% for <sup>36</sup>Cl compared to uncorrected ones, illustrating that the magnitude of weathering correction depends on the abundance of target minerals.</div><div>We find denudation rates of 50–100 mm/ka on the low relief carbonate-dominated Bözberg plateau and intermediate relief incised carbonate valleys of the Randen, where weathering accounts for about 75% and 50% of the denudation, respectively. Along the Bözberg plateau flanks and the mid-relief Wutach tributaries denudation rates range between 100 and 200 mm/ka, with erosion and weathering each contributing about 50%. In the rapidly incising Wutach gorge, denudation rates are 300–500 mm/ka with less than 20% of weathering. These findings show that, similarly to crystalline rocks, the fraction of weathering in mixed sedimentary rocks inversely scales with denudation rate. Our study demonstrates that when sampling sites are chosen to ensure that target minerals are sourced from the same area, paired-mineral measurements and stream-water weathering corrections can be effectively used to determine denudation and weathering rates.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"348 ","pages":"Article 109114"},"PeriodicalIF":3.2,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142746979","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multiple late Holocene glacier advances on the sub-Antarctic Kerguelen (49°S) islands: Evidence from a 1200 yr sediment core from a glacial threshold basin 亚南极凯尔盖朗群岛（南纬 49 度）全新世晚期的多次冰川运动：来自冰川阈值盆地的 1200 年沉积岩芯的证据

IF 3.2 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2024-11-27 DOI: 10.1016/j.quascirev.2024.109106

Jarle Børve Sleire , Jostein Bakke , Fabien Arnaud , Pierre Sabatier , Willem G.M. van der Bilt

Southern Ocean (SO) climate is rapidly changing because of global warming and regional climate feedback loops like shifts of the Southern Hemisphere (SH) westerly winds (SHW) and related Southern Annular Mode (SAM). Over the past decades, the former has been persistently positive, shifting the latter southwards: the ensuing changes in temperature and precipitation are linked to the rapid retreat of mid-latitude mountain glaciers. Beyond the short instrumental period, the long-term impact of this coupled SHW-SAM system on regional glaciers remains poorly constrained. To help close this gap, we reconstruct glacier advances from an outlet glacier on the sub-Antarctic Kerguelen (49°S, 69°E), an archipelago that is strategically located in an under-investigated region of the SHW core belt. Based on alternations between relatively organic and minerogenic mud detected using a multiproxy approach on a 1200-year-long sediment record from a glacial threshold basin, we document glacier advances between 1150 and 850, 820–620, 500–250 and 160–90 cal yr BP. Coincident glacier advances in adjacent regions like sub-Antarctic South Georgia and southern Patagonia, suggest that SO glaciers responded symmetrically to climate forcings during the past 1200 years. We attribute this synchronicity to shifting SAM-like conditions and associated temperature changes. We suggest that cold and negative SAM-like conditions, favourable for glacier growth on the Kerguelen and other SO land masses, dominated during much of this period. Furthermore, the findings presented here support the growing consensus for a two-phased regional expression of the Little Ice Age (LIA).

由于全球变暖以及南半球西风（SHW）和相关的南环流模式（SAM）移动等区域气候反馈回路，南大洋（SO）的气候正在发生迅速变化。在过去几十年中，前者持续为正，使后者南移：随之而来的气温和降水变化与中纬度山区冰川的迅速消退有关。除了短暂的工具期之外，这种耦合的 SHW-SAM 系统对区域冰川的长期影响仍然没有得到很好的解释。为了填补这一空白，我们重建了亚南极凯尔盖朗群岛（南纬 49 度，东经 69 度）出口冰川的冰川运动。根据在冰川阈盆地长达 1200 年的沉积物记录中使用多代理方法检测到的相对有机泥和矿化泥之间的交替，我们记录了公元前 1150 至 850 年、820 至 620 年、500 至 250 年和 160 至 90 卡年之间的冰川推进。相邻地区（如南乔治亚岛亚南极洲和巴塔哥尼亚南部）冰川的同步推进表明，在过去的1200年中，南澳大利亚冰川对气候作用力的反应是对称的。我们将这种同步性归因于类SAM条件的变化和相关的温度变化。我们认为，在这一时期的大部分时间里，有利于凯尔盖朗和其他南澳大利亚陆块冰川生长的寒冷和负SAM样条件占据了主导地位。此外，本文的研究结果还支持了人们对小冰河时期（LIA）的两阶段区域表现形式日益达成的共识。

{"title":"Multiple late Holocene glacier advances on the sub-Antarctic Kerguelen (49°S) islands: Evidence from a 1200 yr sediment core from a glacial threshold basin","authors":"Jarle Børve Sleire , Jostein Bakke , Fabien Arnaud , Pierre Sabatier , Willem G.M. van der Bilt","doi":"10.1016/j.quascirev.2024.109106","DOIUrl":"10.1016/j.quascirev.2024.109106","url":null,"abstract":"<div><div>Southern Ocean (SO) climate is rapidly changing because of global warming and regional climate feedback loops like shifts of the Southern Hemisphere (SH) westerly winds (SHW) and related Southern Annular Mode (SAM). Over the past decades, the former has been persistently positive, shifting the latter southwards: the ensuing changes in temperature and precipitation are linked to the rapid retreat of mid-latitude mountain glaciers. Beyond the short instrumental period, the long-term impact of this coupled SHW-SAM system on regional glaciers remains poorly constrained. To help close this gap, we reconstruct glacier advances from an outlet glacier on the sub-Antarctic Kerguelen (49°S, 69°E), an archipelago that is strategically located in an under-investigated region of the SHW core belt. Based on alternations between relatively organic and minerogenic mud detected using a multiproxy approach on a 1200-year-long sediment record from a glacial threshold basin, we document glacier advances between 1150 and 850, 820–620, 500–250 and 160–90 cal yr BP. Coincident glacier advances in adjacent regions like sub-Antarctic South Georgia and southern Patagonia, suggest that SO glaciers responded symmetrically to climate forcings during the past 1200 years. We attribute this synchronicity to shifting SAM-like conditions and associated temperature changes. We suggest that cold and negative SAM-like conditions, favourable for glacier growth on the Kerguelen and other SO land masses, dominated during much of this period. Furthermore, the findings presented here support the growing consensus for a two-phased regional expression of the Little Ice Age (LIA).</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"347 ","pages":"Article 109106"},"PeriodicalIF":3.2,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142722386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High- and low-latitude forcings on regional hydroclimate variability in Northeast China during Marine Isotope Stage 2 海洋同位素第二阶段高纬度和低纬度对中国东北地区水文气候变异的影响

IF 3.2 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2024-11-25 DOI: 10.1016/j.quascirev.2024.109084

Niankang Chen , Ting Xu , Jiaxin Dou , Dongmei Jie , Guizai Gao , Zhuo Yang

The scarcity of well-dated, highly temporally resolved, paleoclimate records during the Marine Isotope Stage (MIS) 2 in Northeast (NE) China limits our understanding of the hydroclimate history in East Asian monsoon (EAM) region under different boundary conditions and the prediction of future hydroclimate changes. Meanwhile, it has not been comprehensively investigated how high- and low-latitude forcings, as crucial driving factors of global climate change, impact regional hydroclimate on various timescales during the MIS 2. This study applies phytolith-based principal component 1 scores, sum proportions of grain size-based end-members 2 and 3, and values of loss-on-ignition at 550 °C from the Dadong profile, to provide new evidence of hydroclimate changes during the MIS 2 in NE China. The results suggest that the regional humidity was low during the Last Glacial Maximum, and gradually increased during the subsequent Last Deglaciation. Additionally, the typical climate pattern of “warm-humid/cold-dry” in the EAM region was showed during a series of millennial oscillations. Combined with multiple records from NE China, it is observed that the orbital-scale hydroclimate changes during the MIS 2 were relatively consistent in different regions, and were mainly regulated by the ice sheet extents under the control of Northern Hemisphere high-latitude summer insolation. On the millennial scale, however, the hydroclimate changes suggested significant asynchrony or even anti-phase, indicating that the climate pattern may not always be similar to the typical EAM pattern. We propose that a series of sea-land-air interactions under the coupling of North Atlantic Deep Water activities in high latitudes and El Niño-Southern Oscillation in low latitudes, may be responsible for this complicated pattern. This study provides new insights into the climate evolution in NE china and its relationship with the high- and low-latitude forcings, which is beneficial for the explanation of mechanisms behind climate variability in this region.

由于中国东北地区海洋同位素第二阶段（MIS）年代久远、时间分辨率高的古气候记录稀缺，限制了我们对不同边界条件下东亚季风区水文气候历史的了解和对未来水文气候变迁的预测。本研究应用大东剖面基于植物化石的主成分1得分、基于粒度的末级成分2和3的总和比例以及550 ℃点火损失值，为中国东北地区MIS 2期间的水文气候变迁提供了新的证据。结果表明，在末次冰川极盛时期，区域湿度较低，在随后的末次冰期湿度逐渐增加。此外，在一系列千年振荡中，EAM 地区呈现出典型的 "暖-湿/冷-干 "气候模式。结合中国东北地区的多条记录，可以发现MIS 2期间不同地区轨道尺度的水文气候变迁相对一致，主要受北半球高纬度夏季日照控制下的冰盖范围调节。然而，在千年尺度上，水文气候的变化呈现出明显的不同步甚至反相现象，表明气候模式可能并不总是与典型的EAM模式相似。我们提出，在高纬度北大西洋深水活动和低纬度厄尔尼诺-南方涛动的耦合作用下，一系列海陆空相互作用可能是造成这种复杂模式的原因。该研究为了解中国东北地区气候演变及其与高纬度和低纬度强迫的关系提供了新的视角，有利于解释该地区气候变率背后的机制。

{"title":"High- and low-latitude forcings on regional hydroclimate variability in Northeast China during Marine Isotope Stage 2","authors":"Niankang Chen , Ting Xu , Jiaxin Dou , Dongmei Jie , Guizai Gao , Zhuo Yang","doi":"10.1016/j.quascirev.2024.109084","DOIUrl":"10.1016/j.quascirev.2024.109084","url":null,"abstract":"<div><div>The scarcity of well-dated, highly temporally resolved, paleoclimate records during the Marine Isotope Stage (MIS) 2 in Northeast (NE) China limits our understanding of the hydroclimate history in East Asian monsoon (EAM) region under different boundary conditions and the prediction of future hydroclimate changes. Meanwhile, it has not been comprehensively investigated how high- and low-latitude forcings, as crucial driving factors of global climate change, impact regional hydroclimate on various timescales during the MIS 2. This study applies phytolith-based principal component 1 scores, sum proportions of grain size-based end-members 2 and 3, and values of loss-on-ignition at 550 °C from the Dadong profile, to provide new evidence of hydroclimate changes during the MIS 2 in NE China. The results suggest that the regional humidity was low during the Last Glacial Maximum, and gradually increased during the subsequent Last Deglaciation. Additionally, the typical climate pattern of “warm-humid/cold-dry” in the EAM region was showed during a series of millennial oscillations. Combined with multiple records from NE China, it is observed that the orbital-scale hydroclimate changes during the MIS 2 were relatively consistent in different regions, and were mainly regulated by the ice sheet extents under the control of Northern Hemisphere high-latitude summer insolation. On the millennial scale, however, the hydroclimate changes suggested significant asynchrony or even anti-phase, indicating that the climate pattern may not always be similar to the typical EAM pattern. We propose that a series of sea-land-air interactions under the coupling of North Atlantic Deep Water activities in high latitudes and El Niño-Southern Oscillation in low latitudes, may be responsible for this complicated pattern. This study provides new insights into the climate evolution in NE china and its relationship with the high- and low-latitude forcings, which is beneficial for the explanation of mechanisms behind climate variability in this region.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"347 ","pages":"Article 109084"},"PeriodicalIF":3.2,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The isotopic composition of the French Illimani ice core in the Bolivian Andes supports the east-west South American precipitation dipole from the last deglaciation to the mid-Holocene 玻利维亚安第斯山脉法国伊利马尼冰芯的同位素组成支持从末次冰期到全新世中期南美洲东西向降水偶极现象

IF 3.2 1区地球科学 Q1 GEOGRAPHY, PHYSICAL

Quaternary Science Reviews

Pub Date : 2024-11-25 DOI: 10.1016/j.quascirev.2024.109098

Françoise Vimeux , Amaëlle Landais

The age of the deepest part of the French Illimani ice core drilled in 1999 in Bolivia (16.63°S, 67.78°W) has been attributed to the Last Glacial Maximum (LGM). Major uncertainties remain on this initial dating, as it is based on the overall similarity in the isotopic composition of the ice between the Illimani and Huascarán (Peru, 9.11°S, 77.61°W) ice cores. Here, we use available measurements of atmospheric isotopic composition (δ¹⁸O_atm) over the last 5 m of the Illimani ice core to propose a revised dating. The age of the bottom of the Illimani ice core is now estimated at between 14.5 ka BP and 15.2 ka BP, covering a period from the end of the Heinrich stadial 1 to the mid-Holocene. Millennial and orbital variations of the isotopic composition of Illimani ice (δD) over this period are now consistent with records of the isotopic composition of speleothems (δ¹⁸O) located on the western pole of the east-west tropical South American precipitation dipole. We also discuss, for the first time for an Andean ice core, the continuously measured deuterium excess profile of the Illimani ice. The latter appears to be a promising new candidate for discussing vegetation changes that may have occurred in the Amazon basin during the last deglaciation.

1999 年在玻利维亚（南纬 16.63°，西经 67.78°）钻取的法国伊利马尼冰芯最深部分的年龄被认为是末次冰川大期（LGM）。由于这一初步年代测定是基于伊利马尼冰芯和瓦斯卡兰冰芯（秘鲁，南纬 9.11°，西经 77.61°）之间冰同位素组成的整体相似性，因此仍存在很大的不确定性。在此，我们利用现有的伊利马尼冰芯最后 5 米的大气同位素组成（δ18Oatm）测量数据，提出了修订后的年代测定方法。伊利马尼冰芯底部的年龄现在估计为公元前 14.5 千年至公元前 15.2 千年，涵盖了从海因里希第 1 期末期到全新世中期的时期。这一时期伊利马尼冰同位素组成（δD）的千年变化和轨道变化与位于南美洲东西向热带降水偶极西极的岩浆同位素组成（δ18O）的记录一致。我们还首次讨论了安第斯冰芯中连续测量的伊利马尼冰氘过剩曲线。后者似乎是讨论亚马逊盆地在上一次冰期可能发生的植被变化的一个很有希望的新候选对象。

{"title":"The isotopic composition of the French Illimani ice core in the Bolivian Andes supports the east-west South American precipitation dipole from the last deglaciation to the mid-Holocene","authors":"Françoise Vimeux , Amaëlle Landais","doi":"10.1016/j.quascirev.2024.109098","DOIUrl":"10.1016/j.quascirev.2024.109098","url":null,"abstract":"<div><div>The age of the deepest part of the French Illimani ice core drilled in 1999 in Bolivia (16.63°S, 67.78°W) has been attributed to the Last Glacial Maximum (LGM). Major uncertainties remain on this initial dating, as it is based on the overall similarity in the isotopic composition of the ice between the Illimani and Huascarán (Peru, 9.11°S, 77.61°W) ice cores. Here, we use available measurements of atmospheric isotopic composition (δ<sup>18</sup>O<sub>atm</sub>) over the last 5 m of the Illimani ice core to propose a revised dating. The age of the bottom of the Illimani ice core is now estimated at between 14.5 ka BP and 15.2 ka BP, covering a period from the end of the Heinrich stadial 1 to the mid-Holocene. Millennial and orbital variations of the isotopic composition of Illimani ice (δD) over this period are now consistent with records of the isotopic composition of speleothems (δ<sup>18</sup>O) located on the western pole of the east-west tropical South American precipitation dipole. We also discuss, for the first time for an Andean ice core, the continuously measured deuterium excess profile of the Illimani ice. The latter appears to be a promising new candidate for discussing vegetation changes that may have occurred in the Amazon basin during the last deglaciation.</div></div>","PeriodicalId":20926,"journal":{"name":"Quaternary Science Reviews","volume":"347 ","pages":"Article 109098"},"PeriodicalIF":3.2,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142721725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0