期刊
GEOPHYSICAL RESEARCH LETTERS
卷 47, 期 19, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020GL089804
关键词
biogeochemistry; carbon cycle; cryosphere; glacier; organic carbon; riverine
资金
- Alaska Climate Adaptation Science Center
- U.S. National Science Foundation Hydrological Sciences [EAR-0943599]
- EPSCoR [OIA-1753748]
Lateral transport of organic carbon (OC) to the coastal ocean is an important component of the global carbon cycle because rivers transport, mineralize, and bury significant amounts of OC. Glaciers drive water and sediment export from many high-elevation and high-latitude ecosystems, yet their role in watershed OC balances is poorly understood, particularly with regard to particulate OC. Here, we evaluate seasonal water, sediment, and comprehensive OC budgets, including both dissolved and particulate forms, for three watersheds in southeast Alaska that vary in glacier coverage. We show that glacier loss will shift the dominant size fraction of riverine OC from particulate toward dissolved and potentially alter the provenance of particulate OC. Glacier coverage also controls whether OC export is source (C stock) or transport (runoff) limited at the watershed scale. These findings provide insight into the future trajectory of riverine OC export in glacierized regions.
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