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| Sources of g-HCH in Chinese air at near-surface level and deposited to Chinese soil. |
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Abstract CanMETOP model was employed to assess the contributions to g-HCH in Chinese air and soil from four major g-HCH residual regions, including India, the former Soviet Union (FSU), Europe (excluding the FSU),and China itself in 2005. Modeled annual average air concentrations of g-HCH at 1.5 m height above ground surface ranged for 10~100 pg/m3 in eastern region, and 1~10 pg/m3 in western region of China. The former was mainly due to Chinese source (30%~80%), while the major of the later was attributable to Indian source (> 50%). The European and FSU sources both mostly contributed to the Chinese northwestern region (10%). The contributions of deposition in China were also different in different area. Chinese source dominated the deposition of g-HCH in the northeastern area (75%), while Indian source made the largest contribution in northwestern (63%) and southern (67%) areas of China. For whole China, annual total deposition of g-HCH in 2005 was 691 t, among which, 55.1% was from India, 31.6% was from China, 3.6% was from Europe, and 2.5% was from the FSU.
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Received: 04 January 2009
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