Emerging negative impact of warming on summer carbon uptake in northern ecosystems

Tao Wang (), Dan Liu, Shilong Piao, Yilong Wang, Xiaoyi Wang, Hui Guo, Xu Lian, John F Burkhart, Philippe Ciais, Mengtian Huang, Ivan Janssens, Yue Li, Yongwen Liu, Josep Peñuelas, Shushi Peng, Hui Yang, Yitong Yao, Yi Yin and Yutong Zhao
Additional contact information
Tao Wang: Chinese Academy of Sciences
Dan Liu: Chinese Academy of Sciences
Shilong Piao: Chinese Academy of Sciences
Yilong Wang: Laboratoire des Sciences du Climat et de l’Environnement, LSCE
Xiaoyi Wang: Chinese Academy of Sciences
Hui Guo: Chinese Academy of Sciences
Xu Lian: Peking University
John F Burkhart: University of Oslo
Philippe Ciais: Laboratoire des Sciences du Climat et de l’Environnement, LSCE
Mengtian Huang: Peking University
Ivan Janssens: University of Antwerp
Yue Li: Peking University
Yongwen Liu: Peking University
Josep Peñuelas: CREAF, Cerdanyola del Valles
Shushi Peng: Peking University
Hui Yang: Peking University
Yitong Yao: Peking University
Yi Yin: Laboratoire des Sciences du Climat et de l’Environnement, LSCE
Yutong Zhao: Chinese Academy of Sciences

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: Abstract 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.

Date: 2018
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DOI: 10.1038/s41467-018-07813-7

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