气候变化领域集成服务门户(CCPortal): Changes in the Response of the Northern Hemisphere Carbon Uptake to Temperature Over the Last Three Decades

CCPortal

DOI	10.1029/2018GL077316
	Changes in the Response of the Northern Hemisphere Carbon Uptake to Temperature Over the Last Three Decades
	Yin, Yi; Ciais, Philippe; Chevallier, Frederic; Li, Wei; Bastos, Ana; Piao, Shilong; Wang, Tao; Liu, Hongyan
通讯作者	Yin, Y (通讯作者)
发表日期	2018
ISSN	0094-8276
EISSN	1944-8007
起始页码	4371
结束页码	4380
卷号	45 期号:9
英文摘要	The CO2 seasonal cycle amplitude (SCA) in the Northern Hemisphere has increased since the 1960sa feature attributed mainly to enhanced vegetation activity along climate warming and CO2 increase. We identified a temporal change in the sign of the correlation between SCA and air temperature (T) from positive to negative around the year 2000 at most Northern Hemisphere ground stations, consistent with signals from satellite column CO2 measurements since the mid-2000s. Further, we explored potential causes of this change using net biome productivity estimates from three atmospheric inversions for the period 1980-2015. The change in the SCA-T relationship is primarily attributable to changes in the net biome productivity-T relationship: positive correlations weakened in the spring in the high latitudes, confirming a limit to the warmer spring-bigger carbon sink mechanism; negative correlations diminished in the autumn/winter in the mid-to-high latitudes, challenging the warmer winter-larger carbon release assumption and highlighting the complexity of carbon processes outside the peak growing season. Plain Language Summary The seasonal cycle amplitude (SCA) of atmospheric CO(2)an integrated signal of the terrestrial ecosystem metabolismhas increased since the 1960s in the Northern Hemisphere, a feature attributed mainly to enhanced vegetation activity along climate warming and CO2 increase. Earlier studies suggest a strong positive year-to-year correlation between SCA and air temperature (T). Here we identified a temporal change in the sign of the SCA-T correlation from positive to negative around the year 2000 at most Northern Hemisphere ground stations, consistent with signals from satellite column CO2 observations. We further explored potential causes of this change using land carbon flux (termed as net biome productivity) estimates from three atmospheric inversions for the period 1980-2015. The change in the SCA-T relationship is primarily attributable to changes in the net biome productivity-T relationship: positive correlations weakened in the spring in the high latitudes, confirming a limit to the warmer spring-bigger carbon sink mechanism; negative correlations diminished in the autumn/winter in the mid-to-high latitudes, challenging the warmer winter-larger carbon release assumption. This finding highlights a dynamic temperature sensitivity of the terrestrial ecosystem to climate warming and cautions the use of current carbon-climate response to constrain future projections.
关键词	ATMOSPHERIC CO2 SEASONAL CYCLE SURFACE-TEMPERATURE SOIL RESPIRATION EXCHANGE DIOXIDE ECOSYSTEMS INCREASES WINTER FLUX
英文关键词	CO2 seasonal cycle; carbon-climate interaction; temperature sensitivity; net biome production; global carbon cycle; soil respiration
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000434111700069
来源期刊	GEOPHYSICAL RESEARCH LETTERS
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/259348
推荐引用方式 GB/T 7714	Yin, Yi,Ciais, Philippe,Chevallier, Frederic,et al. Changes in the Response of the Northern Hemisphere Carbon Uptake to Temperature Over the Last Three Decades[J]. 中国科学院青藏高原研究所,2018,45(9).
APA	Yin, Yi.,Ciais, Philippe.,Chevallier, Frederic.,Li, Wei.,Bastos, Ana.,...&Liu, Hongyan.(2018).Changes in the Response of the Northern Hemisphere Carbon Uptake to Temperature Over the Last Three Decades.GEOPHYSICAL RESEARCH LETTERS,45(9).
MLA	Yin, Yi,et al."Changes in the Response of the Northern Hemisphere Carbon Uptake to Temperature Over the Last Three Decades".GEOPHYSICAL RESEARCH LETTERS 45.9(2018).