江西南昌站大气CH_(4)浓度变化及区域输送研究  

Study on concentration variation and regional transportation of atmospheric CH_(4) at Nanchang Station in Jiangxi

作　　者：冯敏玉 刘分龙[2] 夏玲君 许怡欣 甘瑞杰 邓超 FENG Minyu;LIU Fenlong;XIA Lingjun;XU Yixin;GAN Ruijie;DENG Chao(Meteorological Bureau of Nanchang,Nanchang 330038,Jiangxi,China;School of Economics,Jiujiang University,Jiujiang 332005,Jiangxi,China;Jiangxi Eco-meteorological Center,Nanchang 330096,Jiangxi,China)

机构地区：[1]江西省南昌市气象局,江西南昌330038 [2]九江学院经济学院,江西九江332005 [3]江西省生态气象中心,江西南昌330096

出　　处：《地球化学》2024年第2期204-211,共8页Geochimica

基　　金：国家自然科学基金项目(42105159);江西省气象科技重点项目(201905);江西省气象科技面上项目(JX2020M16)联合资助。

摘　　要：基于南昌温室气体站2018年12月~2020年11月连续在线监测的CH_(4)浓度数据,对大气CH_(4)浓度变化及区域输送进行研究,结果表明:研究期间南昌站大气CH_(4)的平均浓度为2389×10^(-9),CH_(4)浓度日变化呈现夜间高、白昼低的特征,夏、秋季大气CH_(4)浓度高于冬、春季,春季振幅最小(404×10^(-9)),秋季振幅最大(621×10^(-9))。大气CH_(4)浓度年内变化呈现双峰曲线,3月、11月为谷值,9月、12月为峰值。2020年大气CH_(4)浓度比2019年同期低。ENE风向的CH_(4)浓度较高,在夏季高达3064×10^(-9)。混合单粒子拉格朗日综合轨迹(HYPLIT)模型聚类分析表明,春、秋季大气CH_(4)浓度主要受中长距离气团输送的影响,夏季主要受短距离气团输送的影响,冬季受短距离和长距离气团输送的共同影响。On the basis of the CH_(4) concentration data recorded at the Nanchang Greenhouse Gas Station from December 2018 to November 2020,the concentration and regional transport of atmospheric CH_(4) were studied.The results showed that the average concentration of CH_(4) at Nanchang station was 2389×10^(-9),with a diurnal variation of high at night and low during the day.In addition,seasonal variation was also obvious,with significantly higher atmospheric CH_(4) concentrations in summer and autumn.The minimum seasonal variation appears in spring(404×10^(-9))and the maximum seasonal variation(621×10^(-9))appears in autumn.The annual variation of the atmospheric CH_(4) concentration showed a bimodal curve,with trough values in March and November,and peak values in September and December.In particular,the lowest concentration was recorded in March and the highest in September.The atmospheric CH_(4) concentration in 2020 was generally lower than that in the same period in 2019.The ENE direction wind has a higher average CH_(4) concentration,with the highest value of 3064×10^(-9) in summer.Combined with the hybrid single-particle Lagrangian integrated trajectory(HYPLIT)model,the seasonal clustering analysis showed that the atmospheric CH_(4) concentration was mainly affected by medium-and long-distance air mass transport in spring and autumn,short-distance air mass transport in summer,and both short-and long-distance air mass transport in winter.

关 键 词：温室气体 甲烷 浓度变化 HYPLIT模型 南昌 

分 类 号：P402[天文地球—大气物理学与大气环境] X823[天文地球—大气科学及气象学]