Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.1914135117 |
Siberian and temperate ecosystems shape Northern Hemisphere atmospheric CO2 seasonal amplification | |
Xin Lin; Brendan M. Rogers; Colm Sweeney; Frédéric Chevallier; Mikhail Arshinov; Edward Dlugokencky; Toshinobu Machida; Motoki Sasakawa; Pieter Tans; Gretchen Keppel-Aleks | |
2020-08-17 | |
发表期刊 | Proceedings of the National Academy of Sciences |
出版年 | 2020 |
英文摘要 | The amplitude of the atmospheric CO2 seasonal cycle has increased by 30 to 50% in the Northern Hemisphere (NH) since the 1960s, suggesting widespread ecological changes in the northern extratropics. However, substantial uncertainty remains in the continental and regional drivers of this prominent amplitude increase. Here we present a quantitative regional attribution of CO2 seasonal amplification over the past 4 decades, using a tagged atmospheric transport model prescribed with observationally constrained fluxes. We find that seasonal flux changes in Siberian and temperate ecosystems together shape the observed amplitude increases in the NH. At the surface of northern high latitudes, enhanced seasonal carbon exchange in Siberia is the dominant contributor (followed by temperate ecosystems). Arctic-boreal North America shows much smaller changes in flux seasonality and has only localized impacts. These continental contrasts, based on an atmospheric approach, corroborate heterogeneous vegetation greening and browning trends from field and remote-sensing observations, providing independent evidence for regionally divergent ecological responses and carbon dynamics to global change drivers. Over surface midlatitudes and throughout the midtroposphere, increased seasonal carbon exchange in temperate ecosystems is the dominant contributor to CO2 amplification, albeit with considerable contributions from Siberia. Representing the mechanisms that control the high-latitude asymmetry in flux amplification found in this study should be an important goal for mechanistic land surface models moving forward. |
领域 | 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/291155 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Xin Lin,Brendan M. Rogers,Colm Sweeney,et al. Siberian and temperate ecosystems shape Northern Hemisphere atmospheric CO2 seasonal amplification[J]. Proceedings of the National Academy of Sciences,2020. |
APA | Xin Lin.,Brendan M. Rogers.,Colm Sweeney.,Frédéric Chevallier.,Mikhail Arshinov.,...&Gretchen Keppel-Aleks.(2020).Siberian and temperate ecosystems shape Northern Hemisphere atmospheric CO2 seasonal amplification.Proceedings of the National Academy of Sciences. |
MLA | Xin Lin,et al."Siberian and temperate ecosystems shape Northern Hemisphere atmospheric CO2 seasonal amplification".Proceedings of the National Academy of Sciences (2020). |
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