气候变化领域集成服务门户(CCPortal): Siberian and temperate ecosystems shape Northern Hemisphere atmospheric CO2 seasonal amplification

CCPortal

DOI	10.1073/pnas.1914135117
	Siberian and temperate ecosystems shape Northern Hemisphere atmospheric CO2 seasonal amplification
	Lin X.; Rogers B.M.; Sweeney C.; Chevallier F.; Arshinov M.; Dlugokencky E.; Machida T.; Sasakawa M.; Tans P.; Keppel-Aleks G.
发表日期	2020
ISSN	0027-8424
起始页码	21079
结束页码	21087
卷号	117 期号:35
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.
英文关键词	Amplification; Arctic-boreal; Carbon dioxide; Global change; Seasonal cycle
语种	英语
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
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160822
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...
推荐引用方式 GB/T 7714	Lin X.,Rogers B.M.,Sweeney C.,et al. Siberian and temperate ecosystems shape Northern Hemisphere atmospheric CO2 seasonal amplification[J],2020,117(35).
APA	Lin X..,Rogers B.M..,Sweeney C..,Chevallier F..,Arshinov M..,...&Keppel-Aleks G..(2020).Siberian and temperate ecosystems shape Northern Hemisphere atmospheric CO2 seasonal amplification.Proceedings of the National Academy of Sciences of the United States of America,117(35).
MLA	Lin X.,et al."Siberian and temperate ecosystems shape Northern Hemisphere atmospheric CO2 seasonal amplification".Proceedings of the National Academy of Sciences of the United States of America 117.35(2020).