Importance of active layer freeze-thaw cycles on the riverine dissolved carbon export on the Qinghai-Tibet Plateau permafrost region.

ABSTRACT: The Qinghai-Tibet Plateau (QTP) is experiencing severe permafrost degradation, which can affect the hydrological and biogeochemical processes. Yet how the permafrost change affects riverine carbon export remains uncertain. Here, we investigated the seasonal variations of dissolved inorganic and organic carbon (DIC and DOC) during flow seasons in a watershed located in the central QTP permafrost region. The results showed that riverine DIC concentrations (27.81 ± 9.75 mg L-1) were much higher than DOC concentrations (6.57 ± 2.24 mg L-1). DIC and DOC fluxes were 3.95 and 0.94 g C m-2 year-1, respectively. DIC concentrations increased from initial thaw (May) to freeze period (October), while DOC concentrations remained relatively steady. Daily dissolved carbon concentrations were more closely

SUBMITTER: Song C 

PROVIDER: S-EPMC6585901 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature