气象因素对长三角背景地区甲烷浓度的影响分析  

Impacts of Meteorological Factors on Atmospheric Methane Mole Fractions in the Background Area of Yangtze River Delta

作　　者：浦静姣 徐宏辉 顾骏强 马千里 方双喜[3] 周凌晞[3] 

机构地区：[1]浙江省气象科学研究所,杭州310008 [2]临安区域大气本底站,浙江临安311307 [3]中国气象科学研究院中国气象局大气化学重点开放实验室,北京100081

出　　处：《环境科学》2013年第3期835-841,共7页Environmental Science

基　　金：浙江省公益技术研究社会发展项目(2010C33161);浙江省自然科学基金项目(LY12D050001);公益性行业(气象)科研专项(GYHY200806026)

摘　　要：通过分析2009年1月～2011年12月临安区域大气本底站在线观测获得的CH4浓度,研究地面风向、地面风速、地面气温、日照等气象因素对长三角背景地区CH4浓度的影响.结果表明,临安站CH4浓度的日变化分布表现为单峰型形态,下午低、凌晨高,浓度日变幅在19.0×10-9～74.7×10-9(摩尔分数)之间;季节变化特征表现为春季低、秋季高,月均浓度分布在1 955.7×10-9～2 036.2×10-9之间.NE～SSE风向上CH4浓度较高,SW～NNW风向上CH4浓度较低;地面风速越大,CH4浓度越低;地面气温升高,CH4浓度出现先升后降的分布;随着日照时数的增加,CH4浓度亦表现为先升后降的分布特征.Impacts of surface wind direction, surface wind speed, surface air temperature and sunshine hours on the CH4 concentration at Lin＇ an regional atmospheric background station were studied based on the results from Jan. 2009 to Dec. 2011. The results revealed that the diurnal variation of atmospheric CH4 concentration presented a single-peak curve at Lin＇an regional background station. The diurnal amplitude varied from 19.0 ×10^-9 to 74. 7×10^-9, with the lowest value observed in the afternoon and the highest at dawn. The monthly mean CH4 concentrations varied from 1 955.7 ×10^-9 to 2 036.2 ×10^-9, with the highest concentration observed in autumn and the lowest in spring. The wind directions NE-SSE could induce higher CHn concentrations while SW-NNW wind directions had negative effects on the observed results. The CH4 concentration turned out to be lower with higher surface wind speed. With the increase of surface air temperature or sunshine hours, the CH4 concentration went up first till reaching a peak, and then decreased.

关 键 词：CH4 临安区域大气本底站 气象因素 在线观测 浓度 

分 类 号：X131.1[环境科学与工程—环境科学]