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Estimating regional terrestrial carbon fluxes for the Australian continent using a multiple‐constraint approach 利用多约束方法估算澳大利亚大陆区域陆地碳通量
IF 2.3 4区 地球科学 Pub Date : 2003-04-01 DOI: 10.1034/J.1600-0889.2003.00031.X
Ying‐ping Wang, D. Barrett
We have developed a modelling framework that synthesizes various types of field measurements at different spatial and temporal scales. We used this modelling framework to estimate monthly means and their standard deviations of gross photosynthesis, total ecosystem production, net primary production (NPP) and net ecosystem production (NEP) for eight regions of the Australian continent between 1990 and 1998. Annual mean NPP of the Australian continent varied between 800 and 1100 Mt C yr−1 between 1990 and 1998, with a coefficient of variation that is defined as the ratio of standard deviation and mean between 0.24 and 0.34. The seasonal variation of NPP for the whole continent varied between 50 and 110 Mt C month−1 with two maxima, one in the autumn and another in the spring. NEP was most negative in the winter (a carbon sink) and was most positive (a carbon source) in the summer. However, the coefficient of variation of monthly mean NEP was very large (> 4), and consequently confidence in the predicted net carbon fluxes for any month in the period 1990–1998 for the whole continent was very low. A companion paper will apply atmospheric inverse technique to measurements of CO2 concentration to further constrain the continental carbon cycle and reduce uncertainty in estimated mean monthly carbon fluxes.
我们已经开发了一个模型框架,它综合了不同时空尺度上的各种类型的现场测量。我们使用该模型框架估算了1990年至1998年间澳大利亚大陆8个地区的总光合作用、总生态系统产量、净初级产量(NPP)和净生态系统产量(NEP)的月均值及其标准差。1990年至1998年间,澳大利亚大陆的年平均NPP在800至1100 Mt C yr - 1之间变化,其变异系数定义为标准差与平均值的比值在0.24至0.34之间。整个大陆NPP的季节变化在50 ~ 110 Mt C月- 1之间,有两个最大值,一个在秋季,另一个在春季。NEP在冬季最负(碳汇),在夏季最正(碳源)。然而,月平均NEP的变异系数非常大(> 4),因此对1990-1998年期间整个大陆任何月份净碳通量的预测置信度非常低。另一篇论文将把大气反演技术应用于二氧化碳浓度的测量,以进一步限制大陆碳循环,减少估计的月平均碳通量的不确定性。
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引用次数: 46
Foreword: The Eurosiberian Carbonflux project 前言:欧洲西伯利亚碳通量项目
IF 2.3 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES Pub Date : 2002-11-01 DOI: 10.1034/J.1600-0889.2002.01519.X
M. Heimann
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引用次数: 6
Net CO2 exchange rates in three different successional stages of the 三个不同连续阶段的二氧化碳净交换率
IF 2.3 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES Pub Date : 2002-11-01 DOI: 10.1034/J.1600-0889.2002.01351.X
Carola Röser, Leonardo Montagnani, E. Schulze, D. Mollicone, O. Kolle, M. Meroni, D. Papale, L. Marchesini, S. Federici, R. Valentini
The net ecosystem exchange (NEE) of successional stages of the Abies -dominated dark taiga was measured in central Siberia (61°N 90°E) during the growing season of the year 2000 using the eddy covariance technique. Measurements started before snow melt and canopy activity in spring on day of year (DOY) 99 and lasted until a permanent snow cover had developed and respiration had ceased in autumn DOY 299. Three stands growing in close vicinity were investigated: 50 yr-old Betula pubescens (“Betula stand”, an early successional stage after fire), 250 yr-old mixed boreal forest, representing the transition from Betula -dominated to Abies -dominated canopies, and 200-yr-old Abies sibirica (“Abies stand”, representing a late successional stage following the mixed boreal forest). The mixed boreal forest had a multi-layered canopy with dense understory and trees of variable height and age below the main canopy, which was dominated by Abies sibirica , Picea obovata and few old Betula pubescens and Populus tremula trees. The Abies stand had a uniform canopy dominated by Abies sibirica . This stand appears to have established not after fire but after wind break or insect damage in a later successional stage. The stands differed with respect to the number of days with net CO 2 uptake (Betula stand 89 days, mixed boreal forest 109 days, and Abies stand 135 days), maximum measured LAI (Betula 2.6 m 2 m −2 , mixed boreal forest 3.5 m 2 m −2 and Abies stand 4.1 m 2 m −2 ) and basal area (Betula stand 30.2 m 2 ha −1 , mixed boreal forest 35.7 m 2 ha −1 , and Abies stand 46.5 m 2 ha −1 ). In the mixed boreal forest, many days with net daytime CO 2 release were observed in summer. Both other sites were almost permanent sinks in summer. Mean daytime CO 2 exchange rates in July were −8.45 μmol m −2 s −1 in the Betula stand, −4.65 μmol m −2 s −1 in the mixed boreal forest and −6.31 μmol m −2 s −1 in the Abies stand. Measured uptake for the growing season was −247.2 g C m −2 in the Betula stand, −99.7 g C m −2 in the mixed boreal forest and −269.9 g C m −2 in the Abies stand. The total annual carbon uptake might be slightly lower (i.e. less negative) due to some soil respiration under snow in winter. The study for the first time demonstrates that old forests in the “Dark Taiga” are carbon sinks and that sink activity is very similar in late and early successional stages. Canopy and crown structure with associated self-shading and available radiation are suggested as possible causes for the observed differences. DOI: 10.1034/j.1600-0889.2002.01351.x
利用涡动相关方差技术测定了西伯利亚中部(61°N - 90°E)冷杉为主的暗针叶林在2000年生长期演替阶段的净生态系统交换(NEE)。测量开始于99年春季积雪融化和冠层活动之前,一直持续到299年秋季永久积雪形成和呼吸停止。研究了近距离生长的3个林分:50年树龄的短毛桦林(“桦林”,火灾后演替的早期阶段)、250年树龄的北方混交林,代表了从桦树为主向冷杉为主的林冠过渡,以及200年树龄的西伯利亚冷杉林(“冷杉林”,代表了北方混交林后演替的后期阶段)。混交林林冠层多,林下灌木茂密,主冠层以下乔木高度和树龄均有变化,以西伯利亚冷杉、倒云杉为主,少数老白桦和白杨。冷杉林冠层均匀,以西伯利亚冷杉为主。这种林分似乎不是在火灾之后建立起来的,而是在后期演替阶段的风折或虫害破坏之后建立起来的。看台上对不同的天数与净CO 2吸收(桦木属站89天,北方森林109天,混合和冷杉属站135天),最大测量赖(桦木属2.6米2 m−2,混合北方森林3.5 2 m−−2和冷杉属站4.1米2米2)和基底面积(桦木属站30.2米2公顷−1,混合北方森林35.7 2公顷−1,和冷杉属站46.5米2公顷−1)。在北方混交林中,夏季有许多白天净co2释放日。另外两个地点在夏季几乎都是永久的碳汇。7月白桦林分白天CO 2平均交换速率为−8.45 μmol m−2 s−1,混交林为−4.65 μmol m−2 s−1,冷杉林分为−6.31 μmol m−2 s−1。桦木林分的生长季碳吸收量为- 247.2 g cm - 2,北方混交林为- 99.7 g cm - 2,冷杉林分为- 269.9 g cm - 2。由于冬季积雪下的土壤呼吸作用,年总碳吸收量可能略低(即负碳量较小)。该研究首次证明了“暗针叶林”的原始森林是碳汇,并且碳汇活动在演替后期和早期非常相似。树冠和树冠的自遮阳结构和有效辐射被认为是造成观测差异的可能原因。DOI: 10.1034 / j.1600-0889.2002.01351.x
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引用次数: 56
Three years of trace gas observations over the EuroSiberian domain derived from aircraft sampling – a concerted action 三年的微量气体观测在欧洲西伯利亚地区来自飞机采样-一个协调行动
IF 2.3 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES Pub Date : 2002-11-01 DOI: 10.1034/J.1600-0889.2002.01352.X
I. Levin, P. Ciais, R. Langenfelds, M. Schmidt, M. Ramonet, K. Sidorov, N. M. Tchebakova, M. Gloor, M. Heimann, E. Schulze, N. Vygodskaya, O. Shibistova, J. Lloyd
A three-year trace gas climatology of CO 2 and its stable isotopic ratios, as well as CH 4 ,N 2 O and SF 6 , derived from regular vertical aircraft sampling over the Eurasian continent is presented. The four sampling sites range from about 1° Et o 89°E in the latitude belt from 48° Nt o 62°N. The most prominent features of the CO 2 observations are an increase of the seasonal cycle amplitudes of CO 2 and d13C‐CO 2 in the free troposphere (at 3000 m a.s.l.) by more than 60% from Western Europe to Western and Central Siberia. d18O‐CO 2 shows an even larger increase of the seasonal cycle amplitude by a factor of two from Western Europe towards the Ural mountains, which decreases again towards the most eastern site, Zotino. These data reflect a strong influence of carbon exchange fluxes with the continental biosphere. In particular, during      .   .      .   .      .   . — —
A three-year trace gas climatology of CO 2 and its stable isotopic ratios, as well as CH 4 ,N 2 O and SF 6 , derived from regular vertical aircraft sampling over the Eurasian continent is presented. The four sampling sites range from about 1° Et o 89°E in the latitude belt from 48° Nt o 62°N. The most prominent features of the CO 2 observations are an increase of the seasonal cycle amplitudes of CO 2 and d13C‐CO 2 in the free troposphere (at 3000 m a.s.l.) by more than 60% from Western Europe to Western and Central Siberia. d18O‐CO 2 shows an even larger increase of the seasonal cycle amplitude by a factor of two from Western Europe towards the Ural mountains, which decreases again towards the most eastern site, Zotino. These data reflect a strong influence of carbon exchange fluxes with the continental biosphere. In particular, during      .   .      .   .      .   . — —
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引用次数: 74
A simple three-dimensional canopy - planetary boundary layer simulation model for scalar concentrations and fluxes 标量浓度和通量的简单三维冠层-行星边界层模拟模型
IF 2.3 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES Pub Date : 2002-11-01 DOI: 10.1034/J.1600-0889.2002.201353.X
A. Sogachev, G. Menzhulin, M. Heimann, J. Lloyd
We present a numerical model capable of computing the physical processes within both plant canopy and planetary boundary layer (PBL), offering the potential benefit of wide applicability due to reduced computational requirements. The model, named SCADIS (scalar distribution), synthesizes existing knowledge of boundary and surface layer turbulence and surface layer vegetative processes and was tested using several data sets from the European part of Russia and Siberia obtained as part of the EUROSIBERIAN CARBONFLUX project. Despite simplifications which were necessary in order to simulate the natural processes, the first version of the model presented here demonstrated a satisfactory agreement between modelled and observed data for different surface features and weather conditions. For example, the model successfully predicted the diurnal patterns of concentration profiles of CO2, water vapour and potential temperature profiles both within the summer atmospheric boundary layer and within the plant canopy itself. The very different effects of the surface energy characteristics of bog versus forest on convective boundary layer (CBL) structure and development are also illustrated. The model was applied to evaluate the effective footprints for eddy covariance measurements above non-uniform plant canopies, the case study here being a mixed spruce forest in European Russia. The model also demonstrates the likely variations in the above-canopy turbulence and surface layer fluxes as dependent on the presence of patches of deciduous broadleaf forest within a predominantly evergreen coniferous stand.
我们提出了一个能够计算植物冠层和行星边界层(PBL)内物理过程的数值模型,由于减少了计算需求,提供了广泛适用性的潜在优势。该模型名为SCADIS(标量分布),综合了关于边界层和表层湍流以及表层植被过程的现有知识,并使用来自俄罗斯欧洲部分和西伯利亚的几组数据集进行了测试,这些数据集是欧洲西伯利亚CARBONFLUX项目的一部分。尽管为了模拟自然过程而进行了必要的简化,但本文提出的第一个模型版本表明,对于不同的地表特征和天气条件,模拟数据和观测数据之间的一致性令人满意。例如,该模式成功地预测了夏季大气边界层和植物冠层内部CO2浓度、水汽和潜在温度的日变化。此外,还说明了沼泽和森林的表面能特征对对流边界层(CBL)结构和发展的不同影响。该模型被用于评估非均匀植物冠层上涡动相关测量的有效足迹,这里的案例研究是俄罗斯欧洲的混合云杉林。该模型还表明,在以常绿针叶林为主的林分中,由于落叶阔叶林斑块的存在,冠层上湍流和表层通量可能发生变化。
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引用次数: 113
Seasonal and spatial variability in soil CO2 efflux rates for a central Siberian Pinus sylvestris forest 西伯利亚中部针叶松森林土壤CO2外排速率的季节和空间变异
IF 2.3 4区 地球科学 Pub Date : 2002-11-01 DOI: 10.1034/J.1600-0889.2002.01348.X
O. Shibistova, J. Lloyd, S. Evgrafova, N. Savushkina, G. Zrazhevskaya, A. Arneth, A. Knohl, O. Kolle, E. Schulze
Rates of CO2 efflux from the floor of a central Siberian Scots pine (Pinus sylvestris) forest were measured using a dynamic closed chamber system and by a eddy covariance system placed 2.5 m above the forest floor. Measurements were undertaken for a full growing season: from early May to early October 1999. Spatial variability as determined by the chamber measurements showed the rate of CO2 efflux to depend on location, with rates from relatively open areas (“glades”) only being about 50% those observed below or around trees. This was despite generally higher temperatures in the glade during the day. A strong relationship between CO2 efflux rate and root density was observed in early spring, suggesting that lower rates in open areas may have been attributable to fewer roots there. Continuous measurements with the eddy covariance system provided good temporal coverage. This method, however, provided estimates of ground CO2 efflux rate rates that were about 50% lower than chamber measurements that were undertaken in areas considered to be representative of the forest as a whole. An examination of the seasonal pattern of soil CO2 efflux rates suggests that much of the variability in CO2 efflux rate could be accounted for by variations in soil temperature. Nevertheless, there were also some indications that the soil water deficits served to reduce soil CO2 efflux rates during mid-summer. Overall the sensitivity of CO2 efflux rate to temperature seems to be greater for this boreal ecosystem than has been the case for most other studies.
利用动态封闭室系统和放置在森林地面上方2.5 m处的涡动相关方差系统测量了西伯利亚中部苏格兰松林(Pinus sylvestris)地面的CO2外排速率。测量是在整个生长季节进行的:1999年5月初至10月初。由室内测量确定的空间变异性表明,CO2外排速率取决于位置,相对开阔地区(“林中空地”)的速率仅为树下或树周围观测到的速率的50%左右。尽管白天林间空地的温度普遍较高。在早春观测到CO2外排速率与根系密度之间有很强的关系,这表明开阔地区CO2外排速率较低可能是由于那里的根系较少。使用涡动相关系统的连续测量提供了良好的时间覆盖。然而,这种方法所提供的地面二氧化碳流出率的估计比在被认为代表整个森林的地区进行的室内测量值低约50%。对土壤二氧化碳外排速率的季节性模式的研究表明,二氧化碳外排速率的大部分变化可以用土壤温度的变化来解释。然而,也有一些迹象表明,土壤水分亏缺有助于降低盛夏期间土壤CO2外排率。总的来说,这个北方生态系统的二氧化碳流出率对温度的敏感性似乎比大多数其他研究的情况更大。
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引用次数: 86
Vertical distributions of sulfur species simulated by large scale atmospheric models in COSAM: Comparison with observations: Atmospheric models in COSAM COSAM大尺度大气模式模拟的硫种垂直分布:与观测的比较:COSAM大气模式
IF 2.3 4区 地球科学 Pub Date : 2001-11-01 DOI: 10.1034/J.1600-0889.2001.530508.X
U. Lohmann, W. Leaitch, L. Barrie, K. Law, Y. Yi, D. Bergmann, C. Bridgeman, M. Chin, J. Christensen, R. Easter, J. Feichter, A. Jeuken, E. Kjellström, D. Koch, C. Land, P. Rasch, G. Roelofs
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引用次数: 20
Analysis of regional budgets of sulfur species modeled for the COSAM exercise: Sulfur species modeled for the COSAM exercise COSAM模拟的硫种区域预算分析:COSAM模拟的硫种
IF 2.3 4区 地球科学 Pub Date : 2001-11-01 DOI: 10.1034/J.1600-0889.2001.530509.X
G. Roelofs, P. Kasibhatla, L. Barrie, D. Bergmann, C. Bridgeman, M. Chin, J. Christensen, R. Easter, J. Feichter, A. Jeuken, E. Kjellström, D. Koch, C. Land, U. Lohmann, P. Rasch
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引用次数: 25
Feedback mechanisms and sensitivities of ocean carbon uptake under global warming: Ocean carbon uptake 全球变暖背景下海洋碳吸收的反馈机制和敏感性:海洋碳吸收
IF 2.3 4区 地球科学 Pub Date : 2001-11-01 DOI: 10.1034/J.1600-0889.2001.530504.X
G. Plattner, F. Joos, T. Stocker, O. Marchal
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引用次数: 87
Trends of pollution in rain over East Germany caused by changing emissions: Rain pollution over East Germany 排放变化引起的东德雨水污染趋势:东德的雨水污染
IF 2.3 4区 地球科学 Q3 METEOROLOGY & ATMOSPHERIC SCIENCES Pub Date : 2001-11-01 DOI: 10.1034/J.1600-0889.2001.530502.X
W. Marquardt, E. Brüggemann, R. Auel, H. Herrmann, D. Möller
{"title":"Trends of pollution in rain over East Germany caused by changing emissions: Rain pollution over East Germany","authors":"W. Marquardt, E. Brüggemann, R. Auel, H. Herrmann, D. Möller","doi":"10.1034/J.1600-0889.2001.530502.X","DOIUrl":"https://doi.org/10.1034/J.1600-0889.2001.530502.X","url":null,"abstract":"","PeriodicalId":54432,"journal":{"name":"Tellus Series B-Chemical and Physical Meteorology","volume":"17 1","pages":"529-545"},"PeriodicalIF":2.3,"publicationDate":"2001-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82675224","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 24
期刊
Tellus Series B-Chemical and Physical Meteorology
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