Sammanfattning

High-elevation mountains have experienced disproportionately rapid warming, yet the effect of warming on the lateral export of terrestrial carbon to rivers remains poorly explored and understood in these regions. Here, we present a long-term data set of dissolved inorganic carbon (DIC) and a more detailed, short-term data set of DIC, delta C-13(DIC), and organic carbon from two major rivers of the Qinghai-Tibetan Plateau, the Jinsha River (JSR) and the Yalong River (YLR). In the higher-elevation JSR with similar to 51% continuous permafrost coverage, warming (>3 degrees C) and increasing precipitation coincided with substantially increased DIC concentrations by 35% and fluxes by 110%. In the lower-elevation YLR with similar to 14% continuous permafrost, such increases did not occur despite a comparable extent of warming. Riverine concentrations of dissolved and particulate organic carbon increased with discharge (mobilization) in both rivers. In the JSR, DIC concentrations transitioned from dilution (decreasing concentration with discharge) in earlier, colder years to chemostasis (relatively constant concentration) in later, warmer years. This changing pattern, together with lighter delta C-13(DIC) under high discharge, suggests that permafrost thawing boosts DIC production and export via enhancing soil respiration and weathering. These findings reveal the predominant role of warming in altering carbon lateral export by escalating concentrations and fluxes and modifying export patterns.

Nyckelord

carbon cycle; carbon isotope; concentration-dischargerelationship; climate change; Qinghai-TibetPlateau

Publicerad i

Environmental Science and Technology
2024, Volym: 58, nummer: 16, sidor: 7032 - 7044
Utgivare: AMER CHEMICAL SOC

SLU författare

• Klaus, Marcus

  • Institutionen för skogens ekologi och skötsel, Sveriges lantbruksuniversitet
    

UKÄ forskningsämne

Fysisk geografi
Miljövetenskap


Publikationens identifierare

DOI: https://doi.org/10.1021/acs.est.3c06777

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/129350