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, Yutong Zhao

    Research output: Contribution to journalArticleResearch

    22 Citations (Scopus)


    © 2018, The Author(s). Most studies of the northern hemisphere carbon cycle based on atmospheric CO 2 concentration have focused on spring and autumn, but the climate change impact on summer carbon cycle remains unclear. Here we used atmospheric CO 2 record from Point Barrow (Alaska) to show that summer CO 2 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.
    Original languageEnglish
    Article number5391
    JournalNature Communications
    Publication statusPublished - 1 Dec 2018


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