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Decadal increases in carbon uptake offset by respiratory losses across northern permafrost ecosystems
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2024
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Source: Nature Climate Change, 14(8), 853-862
[PDF-2.44 MB]
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Journal Title:Nature Climate Change
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Description:Tundra and boreal ecosystems encompass the northern circumpolar permafrost region and are experiencing rapid environmental change with important implications for the global carbon (C) budget. We analysed multi-decadal time series containing 302 annual estimates of carbon dioxide (CO2) flux across 70 permafrost and non-permafrost ecosystems, and 672 estimates of summer CO2 flux across 181 ecosystems. We find an increase in the annual CO2 sink across non-permafrost ecosystems but not permafrost ecosystems, despite similar increases in summer uptake. Thus, recent non-growing-season CO2 losses have substantially impacted the CO2 balance of permafrost ecosystems. Furthermore, analysis of interannual variability reveals warmer summers amplify the C cycle (increase productivity and respiration) at putatively nitrogen-limited sites and at sites less reliant on summer precipitation for water use. Our findings suggest that water and nutrient availability will be important predictors of the C-cycle response of these ecosystems to future warming.
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Source:Nature Climate Change, 14(8), 853-862
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DOI:
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ISSN:1758-678X;1758-6798;
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Rights Information:CC BY
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