Siberian 2020 heatwave increased spring CO 2 uptake but not annual CO 2 uptake
Bibliographic Data
Siberia experienced an unprecedented strong and persistent heatwave in winter to spring of 2020. Using bottom–up and top–down approaches, we evaluated seasonal and annual CO 2 fluxes of 2020 in the northern hemisphere (north of 30 °N), focusing on Siberia where the pronounced heatwave occurred. We found that, over Siberia, CO 2 respiration loss in response to the pronounced positive winter temperature anomaly was greater than in previous years. However, continued warming in the spring enhanced photosynthetic CO 2 uptake, resulting in the largest seasonal transition in net ecosystem CO 2 exchange; that is, the largest magnitude of the switch from the net CO 2 loss in winter to net CO 2 uptake in spring until June. However, this exceptional transition was followed by the largest reduction in CO 2 uptake in late summer due to multiple environmental constraints, including a soil moisture deficit. Despite a substantial increase of CO 2 uptake by 22 ± 9 gC m −2 in the spring in response to the heatwave, the mean annual CO 2 uptake over Siberia was slightly lower (3 ± 13 gC m −2 yr −1 ) than the average of the previous five years. These results highlight the highly dynamic response of seasonal carbon fluxes to extreme temperature anomalies at high latitudes, indicating a seasonal compensation between abnormal uptake and release of CO 2 in response to extreme warmth that may limit carbon sink capacity in high northern latitudes
Atmospheric sciences · Biology · Carbon dioxide · Carbon sink · Climate change · Climatology · Ecosystem · Geography · Latitude · Northern Hemisphere · Respiration · Sink (geography · Spring (device · Atmospheric and Environmental Gas Dynamics · Climate variability and models · Cryospheric studies and observations · Environmental Science · Ecology · Geology
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