Solute Production and Transport Processes in Chinese Monsoonal Rivers: Implications for Global Climate Change

Global Biogeochemical Cycles - Tập 34 Số 9 - 2020
Jun Zhong1, Si‐Liang Li1, Daniel E. Ibarra2,3, Hu Ding1, Cong‐Qiang Liu1,4
1Institute of Surface-Earth System Science, School of Earth System Science, Tianjin University, Tianjin, China
2Department of Earth and Planetary Science, University of California, Berkeley, CA, USA
3Department of Geological Sciences, Stanford University, Stanford, CA, USA
4State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China

Tóm tắt

AbstractThe negative feedback between chemical weathering and climate is hypothesized to act as an important control on modulating atmospheric CO2 over geologic timescales, affecting the evolution of Earth's climate over the history of Earth. Here, we investigated solute production processes by analyzing concentration‐discharge, denoted here as concentration‐runoff (C‐q), relationships of Chinese monsoonal rivers, through both the empirical power law relationship and a recently developed Solute Production Model. We found that solute concentrations were highly modulated by hydrologic conditions which shifted the Damköhler number, Da, the ratio of fluid transit time versus the time required to reach equilibrium. Additionally, the among‐catchment behavior of HCO3− responding to changing runoff was correlated with the average Da of each catchment. Rivers with high average Da induced high maximum weathering fluxes, while the maximum weathering potential was primarily controlled by the Damköhler coefficient (Dw, m/yr), the reactivity of the material in the weathering zone over a given length scale, among the catchments in this study. Globally, HCO3− behaviors and weathering characteristics are highly influenced by carbonate bedrock distributions and abundance. In addition, Chinese monsoonal rivers have higher weathering fluxes, weathering potential, and climate‐weathering feedback sensitivity (4.4%/°C) than most other global rivers. Our work disclosed the mechanisms that link runoff, lithology, and weathering fluxes in monsoonal rivers and analyzed the controlling factors on solute dynamics on global scale, which can be implemented in exploring the chemical weathering processes under ongoing global climate change.

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Global Biogeochemical Cycles

Tập 34 Số 9

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