首页|Seasonal compensation implied no weakening of the land carbon sink in the Northern Hemisphere under the 2015/2016 El Ni?o

Seasonal compensation implied no weakening of the land carbon sink in the Northern Hemisphere under the 2015/2016 El Ni?o

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The recurrent extreme El Niño events are commonly linked to reduced vegetation growth and the land carbon sink over many but discrete regions of the Northern Hemisphere(NH).However,we reported here a pervasive and continuous vegetation greening and no weakened land carbon sink in the maturation phase of the 2015/2016 El Nifio event over the NH(mainly in the extra-tropics),based on multiple evidences from remote sensing observations,global ecosystem model simulations and atmospheric CO2 inversions.We discovered a significant compensation effect of the enhanced vegetation growth in spring on subsequent summer/autumn vegetation growth that sustained vegetation greening and led to a slight increase in the land carbon sink over the spring and summer of 2015(average increases of 23.34％and 0.63％in net ecosystem exchange from two independent datasets relative to a 5-years average before the El Niño event,respectively)and spring of2016(6.82％),especially in the extra-tropics of the NH,where the water supply during the pre-growing-season(November of the previous year to March of the current year)had a positive anomaly.This seasonal compensation effect was much stronger than that in 1997 and 1998 and significantly alleviated the adverse impacts of the 2015/2016 El Niño event on vegetation growth during its maturation phase.The legacy effect of water supply during the pre-growing-season on subsequent vegetation growth lasted up to approximately six months.Our findings highlight the role of seasonal compensation effects on mediating the land carbon sink in response to episodic extreme El Niño events.

El NiñoSeasonal compensation effectVegetation greeningLand carbon sinkNet ecosystem exchangeLegacy effect

Fangzhong SHI、Xiuchen WU、Xiaoyan LI、Philippe CIAIS、Hongyan LIU、Chao YUE、Yuting YANG、Shulei ZHANG、Shushi PENG、Yi YIN、Benjamin POULTER、Deliang CHEN

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State Key Laboratory of Earth Surface Processes and Resource Ecology,Beijing Normal University,Beijing 100875,China

Faculty of Geographical Science,Beijing Normal University,Beijing 100875,China

Research and Development Center for Watershed Environmental Eco-Engineering,Beijing Normal University(Zhuhai),Zhuhai 519085,China

Key Laboratory of Tibetan Plateau Land Surface Processes and Ecological Conservation,Qinghai Normal University,Xining 810016,China

Laboratoire des Sciences du Climat et de l'Environnement(LSCE),CEA-CNRS-UVSQ,UMR8212 91191,Gif-sur-Yvette,France

College of Urban and Environmental Science,MOE Laboratory for Earth Surface Processes,Peking University,Beijing 100871,China

State Key Laboratory of Hydroscience and Engineering,Department of Hydraulic Engineering,Tsinghua University,Beijing 100084,China

Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),School of Atmospheric Sciences,Sun Yat-sen University,Guangzhou 510275,China

California Institute of Technology,Pasadena,CA 91125,USA

Biospheric Sciences Laboratory,NASA Goddard Space Flight Center,Greenbelt,Maryland 20771,USA

Regional Climate Group,Department of Earth Sciences,University of Gothenburg,Gothenburg SE-40530,Sweden

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National Key Research and Development Program of ChinaSecond Tibetan Plateau Scientific Expedition and Research Program(STEP)National Natural Science Foundation of ChinaChina Postdoctoral Science FoundationState Key Laboratory of Earth Surface Processes and Resource Ecology of Beijing Normal University

2022YFF08018022019QZKK0306421710502023M7302812023-KF-07

2024

10.1007/s11430-022-1224-1

中国科学:地球科学(英文版)
中国科学院

中国科学:地球科学(英文版)

影响因子：1.002
ISSN：1674-7313
年,卷(期)：2024.67(1)
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