Effect of atmospheric precipitation on the dissolved loads of the Dongjiang River,China

Abstract： The atmospheric precipitation plays an important role in influencing the river chemistry of the Dongjiang River. The atmospheric contribution to river water is estimated by reference to Cl concentration called Clref. The Clref of 41.97 μmol/L represents the highest chloride concentration of the rainwater inputs to river water, thus sea salts are responsible for total Cl concentration of the Dongjiang River. According to the principal compositions of precipitation and river water, we propose two approaches-sea salt correction and precipitation correction in order to correct the contribution proportions of atmospheric precipitation on the solutes and to calculate chemical weathering rate. The results reflected that the atmospheric contribution ratios fluctuate from ~5% to ~20% of TDS(total dissolved solids) in the Dongjiang River. As compared with the other world watersheds, the lower dissolved ion contents and high runoff may result in the obvious influence of precipitation on river chemistry in the Dongjiang basin. The major elemental chemistry is mainly controlled by silicate weathering, with the anion HCO3- and cation Ca2+ and Na+ dominating the major compositions in this basin. The estimated chemical weathering rate of 15.78-23.48 t/(km2·a) is only 40%-60% of a global average in the Dongjiang basin. Certainly, the estimated results are still under correction gradually because the effect of human activities on the precipitation chemistry has never been quantified in detail. 作 者： LI Jing-ying    ZHANG Jing   作者單位： LI Jing-ying(School of Materials and Environmental Sciences, Qingdao University of Science & Technology, Qingdao 266042, China.;Chemistry and Chemical Engineering College, Ocean University of China, Qingdao 266003, China;)

ZHANG Jing(Chemistry and Chemical Engineering College, Ocean University of China, Qingdao 266003, China;State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China) 

期 刊： 環境科學學報(英文版)  ISTICSCI   Journal： JOURNAL OF ENVIRONMENTAL SCIENCES  年，卷(期)： 2004, 16(3)  分類號： X131  Keywords： Dongjiang River    river solutes    precipitation chemistry    atmospheric inputs    chemical weathering rate   

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