Siberian and temperate ecosystems shape Northern Hemisphere atmospheric CO₂ seasonal amplification.

ABSTRACT: The amplitude of the atmospheric CO₂ seasonal cycle has increased by 30 to 50% in the Northern Hemisphere (NH) since the 1960s, suggesting widespread ecological changes in the northern extratropics. However, substantial uncertainty remains in the continental and regional drivers of this prominent amplitude increase. Here we present a quantitative regional attribution of CO₂ seasonal amplification over the past 4 decades, using a tagged atmospheric transport model prescribed with observationally constrained fluxes. We find that seasonal flux changes in Siberian and temperate ecosystems together shape the observed amplitude increases in the NH. At the surface of northern high latitudes, enhanced seasonal carbon exchange in Siberia is the dominant contributor (followed b

SUBMITTER: Lin X 

PROVIDER: S-EPMC7474631 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature