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A terrestrial water-carbon balance model for China I：Concept and model structure
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SONG Zhiyuan ，DUAN Kai ，ZHAO Yong ，ZHAI Jiaqi ，LIU Ning ，SUN Ge 4
（1. College of Civil Engineering，Sun Yat-Sen University，Guangzhou 510275，China；2. State Key Laboratory of Simulation and

Regulation of Water Cycle in River Basin，China Institute of Water Resources and Hydropower Research，Beijing 100038，China；

3. CSIRO，Acton ACT 2601，Australia；4. USDA Forest Service，Research Triangle Park，NC 27709，United States）

Abstract：Water cycle and carbon cycle are fundamental processes that involve the exchanges of material and energy
between terrestrial ecosystems and the atmosphere. Watershed-scale water-carbon coupling models are critical for
quantitatively investigating the responses of water resources and ecosystems to dynamic environmental changes. In

this study，we have enhanced and expanded modules within the WaSSI ecohydrological model，with a specific focus

on evapotranspiration，snowmelt，runoff，and carbon sequestration. The distributed water-carbon balance simulation

model has been developed for China （WaSSI-CN）at a spatial resolution of 0.1°×0.1°. It offers an adaptable tool for

rapid and high-resolution simulations of ecohydrological processes and key components of the terrestrial water-carbon
balance. It can be used to quantitatively analyze the spatiotemporal dynamics of water-carbon balance and evaluate
critical ecosystem services such as water provisioning and carbon sequestration in China.

Keywords：water and carbon balances；water-carbon coupling simulation；WaSSI-CN；model structure

（责任编辑：韩 昆）
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