Dissolved inorganic carbon budget of two alpine catchments in the central Tibetan Plateau: Glaciation matters

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成果归属机构:

水资源与环境学院

作者

Yu, Zhengliang ; Li, Jianhong ; Wu, Guangjian ; Qu, Dongmei ; Wang, Fei ; Ming, Xiaoxing ; Qiu, Haiying ; Liu, Zhu ; Maurischat, Philipp

单位

Chinese Acad Sci, Inst Tibetan Plateau Res, State Key Lab Tibetan Plateau Earth Syst Environm, Beijing 100101, Peoples R China;Chinese Acad Geol Sci, Inst Karst Geol, Key Lab Karst Dynam, MNR & Guangxi, Guilin 541004, Peoples R China;Shanxi Normal Univ, Sch Life Sci, Taiyuan 030031, Peoples R China;China Univ Geosci Beijing, Sch Water Resources & Environm, State Key Lab Biogeol & Environm Geol, Beijing 100083, Peoples R China;Hunan Inst Sci & Technol, Coll Civil Engn & Architecture, Yueyang 414000, Peoples R China;Carl von Ossietzky Univ Oldenburg, Inst Biol & Environm Sci IBU, D-26129 Oldenburg, Germany

关键词

GREENLAND ICE-SHEET; MAJOR ION CHEMISTRY; NAM CO BASIN; ISOTOPE FRACTIONATION; WATER GEOCHEMISTRY; DIOXIDE EMISSIONS; RIVER SYSTEM; GLACIER; CLIMATE; DELTA-C-13

摘要

Dissolved inorganic carbon (DIC) fluxes account for over one-third of the total carbon transported in most rivers. The DIC budget for glacial meltwater of the Tibetan Plateau (TP), however, is still poorly understood, despite the fact, the TP has the largest glacier distribution outside of the Poles. In this study, the Niyaqu and Qugaqie catchments in the central TP were selected to examine the influence of glaciation on the DIC budget in vertical evasion (CO2 exchange rate at the water-air interface) and lateral transport (sources and fluxes) from 2016 to 2018. Significant seasonal variation in DIC concentration was found in the glaciated Qugaqie catchment, but was absent in the not glaciated Niyaqu catchment. delta C-13(DIC) showed seasonal changes for both catchments, with more depleted signatures during the monsoon season. The average CO2 exchange rates in river water of Qugaqie were similar to 8 times lower compared to Niyaqu with values of -1294.6 & PLUSMN; 438.58 mg/m(2)/h and -163.4 & PLUSMN; 581.2 mg/m(2)/h, respectively, indicating that proglacial rivers can act as a substantial CO2 sink due to CO2 consumption by chemical weathering. DIC sources were quantified via the MixSIAR model using delta C-13(DIC) and ionic ratios. During the monsoon season, the contribution from carbonate/silicate weathering driven by atmospheric CO2 was 13-15 % lower, while biogenic CO2 involved in chemical weathering was 9-15 % higher, indicating a seasonal control on weathering agents. Carbonate dissolution driven by H2SO4/HNO3 was the most important contributor to DIC in both catchments (40.7 & PLUSMN; 2.2 % in Niyaqu and 48.5 & PLUSMN; 3.1 % in Qugaqie). The net CO2 consumption rate in the not glaciated Niyaqu catchment was close to 0 (-0.07 & PLUSMN; 0.04 x 10(5) mol/km(2)/y), indicating the carbon sink effect caused by chemical weathering in this area was weak. The net CO2 consumption rate in the glaciated Qugaqie catchment, however, was much lower than that in the not glaciated catchment with a value of -0.28 & PLUSMN; 0.05 x 10(5) mol/km(2)/y. This study highlights that chemical weathering in small glaciated catchments of the central TP plays an active role in releasing CO2 to the atmosphere.

基金

Second Tibetan Plateau Scientific Expedition and Research Program (STEP) [2019QZKK0201]; National Natural Science Foundation of China [4191101270, 42203060]; Guangxi Key Science and Technology Innovation Base on Karst Dynamics [KDL Guangxi202006]; Science and Technology Projects of the Tibet Autonomous Regions [XZ202101ZD0010G]; Nam Co Station for Multisphere Observation and Research

语种

英文

来源

SCIENCE OF THE TOTAL ENVIRONMENT,2023():.

出版日期

2023-11-10

提交日期

2023-09-06

引用参考

Yu, Zhengliang; Li, Jianhong; Wu, Guangjian; Qu, Dongmei; Wang, Fei; Ming, Xiaoxing; Qiu, Haiying; Liu, Zhu; Maurischat, Philipp. Dissolved inorganic carbon budget of two alpine catchments in the central Tibetan Plateau: Glaciation matters[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2023():.

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