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Atmospheric sulfur deposition onto different ecosystems over China
1Department of Atmospheric Science, Nanjing University, Nanjing 210093, China. wangtijian@hotmail.com
Environmental Geochemistry and Health
|October 27, 2004
Summary
The Regional Acid Deposition Model System (RegADMS) simulated sulfur deposition across China, finding dry deposition is dominant. This research provides crucial data for understanding acid deposition impacts on various land uses.
Area of Science:
- Environmental Science
- Atmospheric Chemistry
- Ecosystem Studies
Background:
- Acid deposition poses a significant environmental threat globally.
- Understanding sulfur deposition patterns is crucial for ecological and agricultural management in China.
- Previous models may have limitations in accurately assessing regional deposition.
Purpose of the Study:
- To simulate and quantify air sulfur deposition across different land-use types in China using the RegADMS.
- To validate model outputs with field measurements.
- To compare RegADMS with other regional models like RAINS-ASIA.
Main Methods:
- Application of the Regional Acid Deposition Model System (RegADMS).
- Estimation of dry deposition velocities for SO2 and sulfate aerosols using a big leaf resistance analogy model.
- Parameterization of wet scavenging coefficients based on precipitation rate.
Main Results:
- Annual total sulfur deposition over mainland China estimated at 7.24 million tons, with 56% from dry and 44% from wet deposition.
- Agriculture, grassland, and forest land received 84% of total sulfur deposition.
- Modeled deposition at Yingtan site showed good agreement with measurements, though dry deposition was overestimated.
Conclusions:
- RegADMS provides a reliable tool for simulating regional sulfur deposition in China.
- Dry deposition is the primary pathway for sulfur deposition, particularly in agricultural areas.
- The model's consistency with RAINS-ASIA suggests its applicability for policy-relevant assessments.