Emerging negative impact of warming on summer carbon uptake in northern ecosystems
Wang, Tao (Chinese Academy of Sciences. Center for Excellence in Tibetan Earth Science)
Liu, Dan (Chinese Academy of Sciences. Key Laboratory of Alpine Ecology, Institute of Tibetan Plateau Research)
Piao, Shilong (Chinese Academy of Sciences. Center for Excellence in Tibetan Earth Science)
Wang, Yilong (Laboratoire des Sciences du Climat et de l'Environnement)
Wang, Xiaoyi (Chinese Academy of Sciences. Key Laboratory of Alpine Ecology, Institute of Tibetan Plateau Research)
Guo, Hui (Chinese Academy of Sciences. Key Laboratory of Alpine Ecology, Institute of Tibetan Plateau Research)
Lian, Xu (Peking University. College of Urban and Environmental Sciences)
Burkhart, John F. (University of Oslo. Department of Geosciences)
Ciais, Philippe (Laboratoire des Sciences du Climat et de l'Environnement)
Huang, Mengtian (Peking University. College of Urban and Environmental Sciences)
Janssens, Ivan (University of Antwerp. Department of Biology)
Li, Yue (Peking University. College of Urban and Environmental Sciences)
Liu, Yongwen (Peking University. College of Urban and Environmental Sciences)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Peng, Shushi (Peking University. College of Urban and Environmental Sciences)
Yang, Hui (Peking University. College of Urban and Environmental Sciences)
Yao, Yitong (Peking University. College of Urban and Environmental Sciences)
Yin, Yi (Laboratoire des Sciences du Climat et de l'Environnement)
Zhao, Yutong (Chinese Academy of Sciences. Key Laboratory of Alpine Ecology, Institute of Tibetan Plateau Research)

Data:	2018
Resum:	Most studies of the northern hemisphere carbon cycle based on atmospheric CO2 concentration have focused on spring and autumn, but the climate change impact on summer carbon cycle remains unclear. Here we used atmospheric CO2 record from Point Barrow (Alaska) to show that summer CO2 drawdown between July and August, a proxy of summer carbon uptake, is significantly negatively correlated with terrestrial temperature north of 50°N interannually during 1979-2012. However, a refined analysis at the decadal scale reveals strong differences between the earlier (1979-1995) and later (1996-2012) periods, with the significant negative correlation only in the later period. This emerging negative temperature response is due to the disappearance of the positive temperature response of summer vegetation activities that prevailed in the earlier period. Our finding, together with the reported weakening temperature control on spring carbon uptake, suggests a diminished positive effect of warming on high-latitude carbon uptake.
Ajuts:	European Commission 610028
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Publicat a:	Nature communications, Vol. 9 (December 2018) , art. 5391, ISSN 2041-1723

DOI: 10.1038/s41467-018-07813-7
PMID: 30568168

7 p, 1.3 MB

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