Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.15953 |
Nonlinear interactions of land carbon cycle feedbacks in Earth System Models | |
Yuanyuan Huang; Ying-Ping Wang; Tilo Ziehn | |
2021-11-05 | |
发表期刊 | Global Change Biology |
出版年 | 2021 |
英文摘要 | Carbon cycle feedbacks were often quantified through the carbon–concentration and carbon–climate feedbacks with the assumption of no significant interaction between the two feedbacks in most previous studies. Here we calculated the strength of the interactions between the two responses using simulations of models participated in the phase 6 of the Coupled Model Intercomparison Project (CMIP6). We found that the nonlinear interaction contributed 11% of the land–atmosphere carbon exchange on average with large intermodel variation (from −20% to +162%). This nonlinear interaction is largely driven by the pattern of net primary production (NPP), with shifts in heterotrophic respiration that dampen the overall positive interactions from NPP. Photosynthetic rate per unit leaf area alone cannot adequately explain a wide variation of interactions in global NPP simulated by CMIP6 models. Plant respiration and processes that regulate leaf area are also important contributors to the interactions. Dominant factors that induce carbon–concentration and carbon–climate interactions are highly variable among models. One of those dominant factors is nutrient limitation. Using additional simulations of ACCESS-ESM1.5 that include both nitrogen and phosphorus limitation, we found that the estimated interactions by ACCESS-ESM1.5 with or without nutrient limitations covered the large intermodel variations among the CMIP6 models. It remains largely unknown how nutrient limitation complicates ecosystem's responses to simultaneously CO2 fertilization and warming at the global scale. Our modeling results point to a potential important role of nutrients, especially phosphorus on the nonlinear interactions. Yet, more studies are needed on ecosystem responses to concurrent changes in nutrient availability, atmospheric CO2 concentration, and warming. |
领域 | 气候变化 ; 资源环境 |
URL | 查看原文 |
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/340973 |
专题 | 气候变化 资源环境科学 |
推荐引用方式 GB/T 7714 | Yuanyuan Huang,Ying-Ping Wang,Tilo Ziehn. Nonlinear interactions of land carbon cycle feedbacks in Earth System Models[J]. Global Change Biology,2021. |
APA | Yuanyuan Huang,Ying-Ping Wang,&Tilo Ziehn.(2021).Nonlinear interactions of land carbon cycle feedbacks in Earth System Models.Global Change Biology. |
MLA | Yuanyuan Huang,et al."Nonlinear interactions of land carbon cycle feedbacks in Earth System Models".Global Change Biology (2021). |
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