气候变化领域集成服务门户(CCPortal): A two-fold increase of carbon cycle sensitivity to tropical temperature variations

CCPortal

DOI	10.1038/nature12915
	A two-fold increase of carbon cycle sensitivity to tropical temperature variations
	Wang, Xuhui; Piao, Shilong; Ciais, Philippe; Friedlingstein, Pierre; Myneni, Ranga B.; Cox, Peter; Heimann, Martin; Miller, John; Peng, Shushi; Wang, Tao; Yang, Hui; Chen, Anping
通讯作者	Piao, SL (通讯作者)
发表日期	2014
ISSN	0028-0836
EISSN	1476-4687
起始页码	212
结束页码	+
卷号	506 期号:7487
英文摘要	Earth system models project that the tropical land carbon sink will decrease in size in response to an increase in warming and drought during this century, probably causing a positive climate feedback(1,2). But available data(3-5) are too limited at present to test the predicted changes in the tropical carbon balance in response to climate change. Long-term atmospheric carbon dioxide data provide a global record that integrates the interannual variability of the global carbon balance. Multiple lines of evidence(6-8) demonstrate that most of this variability originates in the terrestrial biosphere. In particular, the year-to-year variations in the atmospheric carbon dioxide growth rate (CGR) are thought to be the result of fluctuations in the carbon fluxes of tropical land areas(6,9,10). Recently, the response of CGR to tropical climate interannual variability was used to put a constraint on the sensitivity of tropical land carbon to climate change(10). Here we use the long-term CGR record from Mauna Loa and the South Pole to show that the sensitivity of CGR to tropical temperature interannual variability has increased by a factor of 1.9 +/- 0.3 in the past five decades. We find that this sensitivity was greater when tropical land regions experienced drier conditions. This suggests that the sensitivity of CGR to interannual temperature variations is regulated by moisture conditions, even though the direct correlation between CGR and tropical precipitation is weak(9). We also find that present terrestrial carbon cycle models do not capture the observed enhancement in CGR sensitivity in the past five decades. More realistic model predictions of future carbon cycle and climate feedbacks require a better understanding of the processes driving the response of tropical ecosystems to drought and warming.
关键词	ATMOSPHERIC CO2 TREE MORTALITY CLIMATE DROUGHT LAND DIOXIDE DATASET FEEDBACKS ANOMALIES EXTREMES
语种	英语
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000331107700036
来源期刊	NATURE
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/258410
推荐引用方式 GB/T 7714	Wang, Xuhui,Piao, Shilong,Ciais, Philippe,et al. A two-fold increase of carbon cycle sensitivity to tropical temperature variations[J]. 中国科学院青藏高原研究所,2014,506(7487).
APA	Wang, Xuhui.,Piao, Shilong.,Ciais, Philippe.,Friedlingstein, Pierre.,Myneni, Ranga B..,...&Chen, Anping.(2014).A two-fold increase of carbon cycle sensitivity to tropical temperature variations.NATURE,506(7487).
MLA	Wang, Xuhui,et al."A two-fold increase of carbon cycle sensitivity to tropical temperature variations".NATURE 506.7487(2014).