摘要
为探究南疆地区大气气溶胶光学厚度的时空分布特征及气象因素对其的影响,采用MODIS MCD19A2数据集2010—2019年的气溶胶数据,分析南疆地区近10 a来AOD时空分布特征及气象因素对AOD的影响.结果表明:①空间分布上,AOD高值区分布在海拔较低的盆地地区,呈现中间高四周低的分布特征.空间分布季节性差异明显,春季高值区域面积最大,夏季高值区则集中在巴州中部(若羌县)与和田地区东南部(民丰县),秋冬季AOD分布特征无明显变化但值相对春夏季较低.②变化趋势上,10 a间南疆地区AOD年均值为0.278±0.035,总增幅为-14.85%,呈波动下降趋势.南疆地区季节变化趋势明显,AOD值呈现春季>夏季>秋季>冬季,春夏季AOD浮动变化明显,秋冬季相对平缓.月变化特征呈现为双峰型,两个峰值分别出现在4月和9月.③RF模型预测风速、温度、相对湿度、水气压、最小水平能见度对南疆地区AOD都具有一定影响,其中,风速和相对湿度对AOD的影响程度最大.能见度与AOD呈负相关,说明南疆地区气溶胶粒子多分布在低层大气.
In order to explore the spatial and temporal distribution of aerosol optical depth and the influence of meteorological factors in southern Xinjiang,the aerosol data of MODIS MCD19A2 dataset from 2010 to 2019 were used in this study.The results show that:(1)In terms of spatial distribution,the AOD high-values were concentrated in the basin area with low altitude,showing the distribution pattern of high in the basin and low in the surrounding.There were significant seasonal changes in the spatial distribution of AOD.High AOD values coverd the largest area in spring,and the high-values in summer was concentrated in the central part of Bazzhou(Ruoqiang County)and the southeast part of Hotan(Minfeng County).The distribution of AOD was similar in autumn and winter with significantly lower values than in the spring and summer.(2)In terms of temporal variations,the annual mean of AOD in southern Xinjiang was 0.278±0.035 in 10 years,with a total increase of-14.85%.In southern Xinjiang,there was significant seasonal changes.AOD value in spring>summer>autumn>winter,spring and summer AOD fluctuated obviously,and autumn and winter AOD changed relatively smoothly.The monthly AOD variations presented a bimodal pattern with the two peaks appeared in April and September,respectively.(3)The RF model predicted that wind speed,air temperature,relative humidity,water pressure,and minimum horizontal visibility had effects on AOD in southern Xinjiang.Among them,wind speed and relative humidity had the large impact on AOD.Visibility and AOD were negatively correlated,indicating that aerosol particles in southern Xinjiang were mostly distributed in the lower atmosphere.
作者
陆忠奇
李京龙
何清
赵竹君
LU Zhongqi;LI Jinglong;HE Qing;ZHAO Zhujun(College of Resources&Environment Sciences,Xinjiang University,Urumqi 830046;Institute of Desert Meteorology,China Meteorological Administration/National Observation and Research Station of Desert Meteorology,Taklimakan Desert of Xinjiang/Taklimakan Desert Meteorology Field Experiment Station of China Meteorological Administration/Xinjiang Key Laboratory of Desert Meteorology and Sandstorm,Urumqi 830002)
出处
《环境科学学报》
CAS
CSCD
北大核心
2022年第3期309-321,共13页
Acta Scientiae Circumstantiae
基金
国家自然科学基金重点项目(No.42030612,41830968)。
作者简介
陆忠奇(1996-),男,E-mail:lzq101016@163.com;责任作者:何清,E-mail:qinghe@idm.cn。
