摘要:
以中国为研究区域,利用CanMETOP模型模拟了2005年大气中α-六六六(α-HCH)浓度的变化,并分析了东亚夏季风对我国东部地区大气中α-HCH浓度时空分布的影响.模拟结果表明,6月15日—8月15日期间,东北、华北和东南地区的α-HCH平均大气浓度分别为260pg·m-3,74pg·m-3和41pg·m-3.大气浓度具有明显的时空分布特征,从6月15日在我国东南地区开始出现了较高的大气浓度堆集,6月24日达到最大值(259pg·m-3).在向我国北部传输过程中,7月1日在东北形成的气旋区域出现最大值(1947pg·m-3).此后,东南地区的大气浓度均处于较低的水平(50pg·m-3),而东北地区的大气浓度一直处于100—350pg·m-3之间的较高水平.分析结果表明,东亚夏季风可以将东南地区大气中的α-HCH传输至东北地区,并在东北区域堆集.
Abstract:
Air concentration of α-HCH was simulated by using CanMETOP model in regional scale in 2005.The temporal and spatial patterns of α-HCH atmospheric concentrations in eastern region of China caused by East Asian Summer Monsoon was analyzed.The simulated results showed that the mean air concentrations of the pesticide in northeast,mid-east and southeast were 260 pg·m-3,74 pg·m-3 and 41 pg·m-3 from June 15 to August 15,respectively.The concentration appeared to accumulate in southeastern region since June 15,and reached the largest value in the region on June 24(259 pg·m-3).When α-HCH was transported from southeastern to northeastern region,the highest air concentration in northeast region occurred on July 1(1947 pg·m-3).Hereafter,while air concentrations of α-HCH in southeastern region were lower than 50 pg·m-3,those in northeastern region were still at a higher level,ranged from 100 to 350 pg·m-3.It was suggested that East Asian summer monsoon can carry α-HCH from the southeast of China to the northeast of China by atmospheric transport,and accumulate the insecticide in the air of the latter.