Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2018GL078131 |
Soil Moisture Stress as a Major Driver of Carbon Cycle Uncertainty | |
Trugman, A. T.1; Medvigy, D.2; Mankin, J. S.3,4; Anderegg, W. R. L.1 | |
2018-07-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2018 |
卷号 | 45期号:13页码:6495-6503 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Future projections suggest an increase in drought globally with climate change. Current vegetation models typically regulate the plant photosynthetic response to soil moisture stress through an empirical function, rather than a mechanistic response where plant water potentials respond to changes in soil water. This representation of soil moisture stress may introduce significant uncertainty into projections for the terrestrial carbon cycle. We examined the use of the soil moisture limitation function in historical and future emissions scenarios in nine Earth system models. We found that soil moisture-limited productivity across models represented a large and uncertain component of the simulated carbon cycle, comparable to 3-286% of current global productivity. Approximately 40-80% of the intermodel variability was due to the functional form of the limitation equation alone. Our results highlight the importance of implementing mechanistic water limitation schemes in models and illuminate several avenues for improving projections of the land carbon sink. Plain Language Summary Understanding the environmental controls of terrestrial ecosystem productivity is of critical importance because terrestrial ecosystems directly impact the concentration of CO2 in the atmosphere. However, model projections disagree on the future sign and magnitude of terrestrial ecosystem CO2 drawdown, so it is uncertain if terrestrial ecosystems will continue to mitigate climate change in the future. Here we show that the current representation of water-limited productivity across state-of-the-art vegetation models is a large and uncertain component of terrestrial productivity, comparable in magnitude to current global productivity. Our results provide a foundation for improved projections of climate change impacts on terrestrial ecosystems, ranging from vegetation growth to agricultural productivity. |
英文关键词 | carbon cycle uncertainty climate change soil moisture stress drought terrestrial carbon cycle vegetation model |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000439784300019 |
WOS关键词 | SEMIARID ECOSYSTEMS ; HYDRAULIC TRAITS ; DIOXIDE UPTAKE ; CLIMATE ; VEGETATION ; DROUGHT ; LAND ; INCREASE ; VARIABILITY ; PROJECTIONS |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/28167 |
专题 | 气候变化 |
作者单位 | 1.Univ Utah, Dept Biol, Salt Lake City, UT 84112 USA; 2.Univ Notre Dame, Dept Biol Sci, Notre Dame, IN 46556 USA; 3.Columbia Univ, Lamont Doherty Geol Observ, Div Ocean & Climate Phys, Palisades, NY 10964 USA; 4.Dartmouth Coll, Dept Geog, Hanover, NH 03755 USA |
推荐引用方式 GB/T 7714 | Trugman, A. T.,Medvigy, D.,Mankin, J. S.,et al. Soil Moisture Stress as a Major Driver of Carbon Cycle Uncertainty[J]. GEOPHYSICAL RESEARCH LETTERS,2018,45(13):6495-6503. |
APA | Trugman, A. T.,Medvigy, D.,Mankin, J. S.,&Anderegg, W. R. L..(2018).Soil Moisture Stress as a Major Driver of Carbon Cycle Uncertainty.GEOPHYSICAL RESEARCH LETTERS,45(13),6495-6503. |
MLA | Trugman, A. T.,et al."Soil Moisture Stress as a Major Driver of Carbon Cycle Uncertainty".GEOPHYSICAL RESEARCH LETTERS 45.13(2018):6495-6503. |
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