globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1914135117
论文题名:
Siberian and temperate ecosystems shape Northern Hemisphere atmospheric CO2 seasonal amplification
作者: Lin X.; Rogers B.M.; Sweeney C.; Chevallier F.; Arshinov M.; Dlugokencky E.; Machida T.; Sasakawa M.; Tans P.; Keppel-Aleks G.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:35
起始页码: 21079
结束页码: 21087
语种: 英语
英文关键词: Amplification ; Arctic-boreal ; Carbon dioxide ; Global change ; Seasonal cycle
Scopus关键词: Alaska ; Article ; atmospheric transport ; Canada ; carbon dynamics ; carbon footprint ; controlled study ; environmental impact ; environmental parameters ; global change ; latitude ; net carbon exchange ; Northern Hemisphere ; priority journal ; remote sensing ; Russian Federation ; seasonal variation ; troposphere ; vegetation ; Arctic ; atmosphere ; carbon cycle ; chemistry ; climate ; climate change ; ecosystem ; North America ; photosynthesis ; physiology ; season ; carbon ; carbon dioxide ; Arctic Regions ; Atmosphere ; Carbon ; Carbon Cycle ; Carbon Dioxide ; Climate ; Climate Change ; Ecosystem ; North America ; Photosynthesis ; Seasons ; Siberia
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. © 2020 National Academy of Sciences. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/164060
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作者单位: Lin, X., Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI 48109, United States; Rogers, B.M., Woods Hole Research Center, Falmouth, MA 02540, United States; Sweeney, C., Global Monitoring Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305, United States; Chevallier, F., Laboratoire des Sciences du Climat et de l’Environnement, Institut Pierre Simon Laplace, Commissariat à l’Énergie Atomique et aux Énergies Alternatives–CNRS, Université de Versailles Saint-Quentin-en-Yvelines, Université Paris-Saclay, Gif-sur-Yvette, F-91191, France; Arshinov, M., Vladimir Evseevich Zuev Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences, Tomsk, 634055, Russian Federation; Dlugokencky, E., Global Monitoring Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305, United States; Machida, T., Center for Global Environmental Research, National Institute for Environmental Studies, Tsukuba, Ibaraki 305-8506, Japan; Sasakawa, M., Center for Global Environmental Research, National Institute for Environmental Studies, Tsukuba, Ibaraki 305-8506, Japan; Tans, P., Global Monitoring Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305, United States; Keppel-Aleks, G., Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI 48109, United States

Recommended Citation:
Lin X.,Rogers B.M.,Sweeney C.,et al. Siberian and temperate ecosystems shape Northern Hemisphere atmospheric CO2 seasonal amplification[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(35)
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