Using Sub-Grid Scale Method to Quantify Atmospheric Deposition of Sulfur in East China

Yan Zhang ； Ti-Jian Wang ； Li-Min Chen

《Terrestrial, Atmospheric and Oceanic Sciences》 18卷5期 (2007/12) Pp. 1051-1065

並列摘要

Atmospheric sulfur deposition in East China was studied using the Regional Acid Deposition Modeling System (RegADMS) with a horizontal resolution of 75 km. A one-year run was performed for the year 2000. As a result, the annually averaged V(subscript d) for SO2 and SO4(superscript 2-) are 0.34 and 0.27 cm s^(-1), respectively. The calculated V(subscript d) for SO2 and SO4(superscript 2-) at Yingtan agreed well with the semi-measurements. And the modeled V(subscript d) over different land-use types were generally in agreement with those reported from the references. The sub-grid scale (25×25 km) method (SSM) was proven to better describe the dry deposition process and save computational time when estimating dry deposition velocity (V(subscript d)) than the coarse grid scale (75×75 km) method. The estimated total deposition of sulfur in East China is 2.22×10^6 ton yr^(-1). Dry deposition accounts for almost 55% of the total deposition and more than 90% of sulfur was deposited on the soil-plant ecosystem. There was evident regional distribution of sulfur depositions in the provinces of the studied area, with most values more than 3~5 g m^(-2) yr^(-1).

並列關鍵字

Sub-Grid scale method ； Sulfur ； Dry deposition velocity ； East China