气候变化领域集成服务门户(CCPortal): Variations in atmospheric CO2 growth rates coupled with tropical temperature

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DOI	10.1073/pnas.1219683110
	Variations in atmospheric CO2 growth rates coupled with tropical temperature
	Wang, Weile; Ciais, Philippe; Nemani, Ramakrishna R.; Canadell, Josep G.; Piao, Shilong; Sitch, Stephen; White, Michael A.; Hashimoto, Hirofumi; Milesi, Cristina; Myneni, Ranga B.
通讯作者	Wang, WL (通讯作者)
发表日期	2013
ISSN	0027-8424
起始页码	13061
结束页码	13066
卷号	110 期号:32
英文摘要	Previous studies have highlighted the occurrence and intensity of El Nino-Southern Oscillation as important drivers of the interannual variability of the atmospheric CO2 growth rate, but the underlying biogeophysical mechanisms governing such connections remain unclear. Here we show a strong and persistent coupling (r(2) approximate to 0.50) between interannual variations of the CO2 growth rate and tropical land-surface air temperature during 1959 to 2011, with a 1 degrees C tropical temperature anomaly leading to a 3.5 +/- 0.6 Petagrams of carbon per year (PgC/y) CO2 growth-rate anomaly on average. Analysis of simulation results from Dynamic Global Vegetation Models suggests that this temperature-CO2 coupling is contributed mainly by the additive responses of heterotrophic respiration (Rh) and net primary production (NPP) to temperature variations in tropical ecosystems. However, we find a weaker and less consistent (r(2) approximate to 0.25) interannual coupling between CO2 growth rate and tropical land precipitation than diagnosed from the Dynamic Global Vegetation Models, likely resulting from the subtractive responses of tropical Rh and NPP to precipitation anomalies that partly offset each other in the net ecosystem exchange (i.e., net ecosystem exchange approximate to Rh - NPP). Variations in other climate variables (e.g., large-scale cloudiness) and natural disturbances (e.g., volcanic eruptions) may induce transient reductions in the temperature-CO2 coupling, but the relationship is robust during the past 50 y and shows full recovery within a few years after any such major variability event. Therefore, it provides an important diagnostic tool for improved understanding of the contemporary and future global carbon cycle.
关键词	NET PRIMARY PRODUCTION CARBON-DIOXIDE INTERANNUAL VARIABILITY CLIMATE FOREST LAND DROUGHT SENSITIVITY CYCLE PRECIPITATION
英文关键词	climate-carbon cycle coupling; tropical land surface temperature; global dynamic vegetation model
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000322771100055
来源期刊	PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258244
推荐引用方式 GB/T 7714	Wang, Weile,Ciais, Philippe,Nemani, Ramakrishna R.,et al. Variations in atmospheric CO2 growth rates coupled with tropical temperature[J]. 中国科学院青藏高原研究所,2013,110(32).
APA	Wang, Weile.,Ciais, Philippe.,Nemani, Ramakrishna R..,Canadell, Josep G..,Piao, Shilong.,...&Myneni, Ranga B..(2013).Variations in atmospheric CO2 growth rates coupled with tropical temperature.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,110(32).
MLA	Wang, Weile,et al."Variations in atmospheric CO2 growth rates coupled with tropical temperature".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 110.32(2013).