气候变化领域集成服务门户(CCPortal): Carbon dioxide sources from Alaska driven by increasing early winter respiration from Arctic tundra

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DOI	10.1073/pnas.1618567114
	Carbon dioxide sources from Alaska driven by increasing early winter respiration from Arctic tundra
	Commane R.; Lindaas J.; Benmergui J.; Luus K.A.; Chang R.Y.-W.; Daube B.C.; Euskirchen E.S.; Henderson J.M.; Karion A.; Miller J.B.; Miller S.M.; Parazoo N.C.; Randerson J.T.; Sweeney C.; Tans P.; Thoning K.; Veraverbeke S.; Miller C.E.; Wofsy S.C.
发表日期	2017
ISSN	0027-8424
起始页码	5361
结束页码	5366
卷号	114 期号:21
英文摘要	High-latitude ecosystems have the capacity to release large amounts of carbon dioxide (CO2) to the atmosphere in response to increasing temperatures, representing a potentially significant positive feedback within the climate system. Here, we combine aircraft and tower observations of atmospheric CO2 with remote sensing data and meteorological products to derive temporally and spatially resolved year-round CO2 fluxes across Alaska during 2012-2014. We find that tundra ecosystems were a net source of CO2 to the atmosphere annually, with especially high rates of respiration during early winter (October through December). Long-term records at Barrow, AK, suggest that CO2 emission rates from North Slope tundra have increased during the October through December period by 73% ± 11% since 1975, and are correlated with rising summer temperatures. Together, these results imply increasing early winter respiration and net annual emission of CO2 in Alaska, in response to climate warming. Our results provide evidence that the decadalscale increase in the amplitude of the CO2 seasonal cycle may be linked with increasing biogenic emissions in the Arctic, following the growing season. Early winter respirationwas not well simulated by the Earth System Models used to forecast future carbon fluxes in recent climate assessments. Therefore, these assessments may underestimate the carbon release from Arctic soils in response to a warming climate.
英文关键词	Alaska; Arctic; Carbon dioxide; Early winter respiration; Tundra
语种	英语
scopus关键词	carbon dioxide; aircraft; Alaska; arctic tundra; Article; atmosphere; carbon source; climate change; ecosystem; greenhouse effect; priority journal; remote sensing; summer; temperature; winter
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/158969
作者单位	Commane, R., Harvard John A. Paulson School of Engineering and Applied Sciences, Cambridge, MA 02138, United States, Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, United States; Lindaas, J., Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, United States; Benmergui, J., Harvard John A. Paulson School of Engineering and Applied Sciences, Cambridge, MA 02138, United States; Luus, K.A., Center for Applied Data Analytics, Dublin Institute of Technology, Dublin 2, Ireland; Chang, R.Y.-W., Department of Physics and Atmospheric Science, Dalhousie University, Halifax, NS B3H 4R2, Canada; Daube, B.C., Harvard John A. Paulson School of Engineering and Applied Sciences, Cambridge, MA 02138, United States, Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, United States; Euskirchen, E.S., Institute of Arctic Biology, University of Alaska Fairbanks, Fairbanks, AK 99775, United States; Henderson, J.M., At...
推荐引用方式 GB/T 7714	Commane R.,Lindaas J.,Benmergui J.,et al. Carbon dioxide sources from Alaska driven by increasing early winter respiration from Arctic tundra[J],2017,114(21).
APA	Commane R..,Lindaas J..,Benmergui J..,Luus K.A..,Chang R.Y.-W..,...&Wofsy S.C..(2017).Carbon dioxide sources from Alaska driven by increasing early winter respiration from Arctic tundra.Proceedings of the National Academy of Sciences of the United States of America,114(21).
MLA	Commane R.,et al."Carbon dioxide sources from Alaska driven by increasing early winter respiration from Arctic tundra".Proceedings of the National Academy of Sciences of the United States of America 114.21(2017).