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

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 tempera

SUBMITTER: Wang T 

PROVIDER: S-EPMC6300666 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature