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DOI | 10.1088/1748-9326/aae0ff |
Divergent patterns of experimental and model-derived permafrost ecosystem carbon dynamics in response to Arctic warming | |
Schadel, Christina1,2; Koven, Charles D.3; Lawrence, David M.4; Celis, Gerardo1,2; Garnello, Anthony J.1,2; Hutchings, Jack5; Mauritz, Marguerite1,2; Natali, Susan M.6; Pegoraro, Elaine1,2; Rodenhizer, Heidi1,2; Salmon, Verity G.7,8; Taylor, Meghan A.1,2; Webb, Elizabeth E.9; Wieder, William R.4,10; Schuur, Edward A. G.1,2 | |
2018-10-01 | |
发表期刊 | ENVIRONMENTAL RESEARCH LETTERS |
ISSN | 1748-9326 |
出版年 | 2018 |
卷号 | 13期号:10 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | In the last few decades, temperatures in the Arctic have increased twice as much as the rest of the globe. As permafrost thaws in response to this warming, large amounts of soil organic matter may become vulnerable to decomposition. Microbial decomposition will release carbon (C) from permafrost soils, however, warmer conditions could also lead to enhanced plant growth and C uptake. Field and modeling studies show high uncertainty in soil and plant responses to climate change but there have been few studies that reconcile field and model data to understand differences and reduce uncertainty. Here, we evaluate gross primary productivity (GPP), ecosystem respiration (R eco ), and net ecosystem C exchange (NEE) from eight years of experimental soil warming in moist acidic tundra against equivalent fluxes from the Community Land Model during simulations parameterized to reflect the field conditions associated with this manipulative field experiment. Over the eight-year experimental period, soil temperatures and thaw depths increased with warming in field observations and model simulations. However, the field and model results do not agree on warming effects on water table depth; warming created wetter soils in the field and drier soils in the models. In the field, initial increases in growing season GPP, R-eco, and NEE to experimentally-induced permafrost thaw created a higher C sink capacity in the first years followed by a stronger C source in years six through eight. In contrast, both models predicted linear increases in GPP, R-eco, and NEE with warming. The divergence of model results from field experiments reveals the role subsidence, hydrology, and nutrient cycling play in influencing the C flux responses to permafrost thaw, a complexity that the models are not structurally able to predict, and highlight challenges associated with projecting C cycle dynamics across the Arctic. |
英文关键词 | gross primary productivity net ecosystem exchange ecosystem respiration tundra thaw CLM |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000446194800001 |
WOS关键词 | EARTH SYSTEM MODELS ; ALASKAN TUNDRA ; CLIMATE-CHANGE ; SPECIES COMPOSITION ; TUSSOCK TUNDRA ; CO2 FLUX ; SOIL ; NITROGEN ; PRODUCTIVITY ; THAW |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
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/37602 |
专题 | 气候变化 |
作者单位 | 1.No Arizona Univ, Ctr Ecosyst Sci & Soc, Flagstaff, AZ 86011 USA; 2.No Arizona Univ, Dept Biol, Flagstaff, AZ 86011 USA; 3.Lawrence Berkeley Natl Lab, Climate & Ecosyst Sci Div, Berkeley, CA USA; 4.Natl Ctr Atmospher Res, Climate & Global Dynam Lab, POB 3000, Boulder, CO 80307 USA; 5.Washington Univ, Dept Earth & Planetary Sci, St Louis, MO 63130 USA; 6.Woods Hole Res Ctr, Falmouth, MA USA; 7.Oak Ridge Natl Lab, Div Environm Sci, POB 2008, Oak Ridge, TN 37831 USA; 8.Oak Ridge Natl Lab, Climate Change Sci Inst, Oak Ridge, TN USA; 9.Univ Florida, Sch Nat Resources & Environm, Gainesville, FL USA; 10.Univ Colorado, Inst Arctic & Alpine Res, Boulder, CO 80309 USA |
推荐引用方式 GB/T 7714 | Schadel, Christina,Koven, Charles D.,Lawrence, David M.,et al. Divergent patterns of experimental and model-derived permafrost ecosystem carbon dynamics in response to Arctic warming[J]. ENVIRONMENTAL RESEARCH LETTERS,2018,13(10). |
APA | Schadel, Christina.,Koven, Charles D..,Lawrence, David M..,Celis, Gerardo.,Garnello, Anthony J..,...&Schuur, Edward A. G..(2018).Divergent patterns of experimental and model-derived permafrost ecosystem carbon dynamics in response to Arctic warming.ENVIRONMENTAL RESEARCH LETTERS,13(10). |
MLA | Schadel, Christina,et al."Divergent patterns of experimental and model-derived permafrost ecosystem carbon dynamics in response to Arctic warming".ENVIRONMENTAL RESEARCH LETTERS 13.10(2018). |
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