摘要
基于2005~2020年OMI遥感卫星O_(3)柱浓度数据,结合河西走廊地区10个国控点环境自动监测站大气污染物数据和全球资料同化系统(GDAS)气象资料,利用克里金插值法、相关性分析和后向轨迹(HYSPLIT)模型,探讨河西走廊近地面O_(3)时空分布特征、气象因素、传输路径和潜在来源.结果表明:①从时间变化来看,O_(3)柱浓度在2005~2010年和2014~2020年呈上升趋势,2010~2014年呈下降趋势,2010年和2014年分别达到最大值和最小值,分别为332.31 DU和301.00 DU,季节变化表现为春季和冬季明显大于夏季和秋季.②在空间分布上,O_(3)柱浓度大体呈现由西南向东北递增的纬向带状分布特征,高值区主要分布在地势低平的城市区域,中值区呈纬向带状与祁连山山麓走向基本一致.③气象条件分析发现,温度、风速和日照时数与O_(3)呈现正相关,相对湿度与O_(3)呈现负相关.④通过对武威市模拟受点气流输送轨迹发现,O_(3)输送路径方向较为单一,各季节的主导气流均以西部和西北部为主,所占比例分别为71.62%、66.85%、61.22%和77.78%;O_(3)潜在贡献源区存在一定的季节差异:春季、夏季和秋季的O_(3)潜在源高值区域均分布于白银市和兰州市等地,为东南风源,冬季高值区分布于巴丹吉林沙漠和腾格里沙漠之间,为北风源.
Based on 2005⁃2020 O_(3) column concentration data of OMI remote sensing satellite,combined with air pollutant data from 10 nationally controlled environmental automatic monitoring stations in the Hexi Corridor and global data assimilation system meteorological data,we used Kriging interpolation,correlation analysis,and backward trajectory(HYSPLIT)models to explore the temporal and spatial distribution characteristics,meteorological factors,transmission paths,and potential sources of O_(3) in the Hexi Corridor.The results showed the following:①in terms of temporal distribution,O_(3) column concentration showed an upward trend in 2005⁃2010 and 2014⁃2020 and downward trend in 2010⁃2014;the maximum and minimum values were reached in 2010 and 2014(332.31 DU and 301.00 DU),respectively,and seasonal changes showed that those in spring and winter were significantly higher than those in summer and autumn.②In terms of spatial distribution,O_(3) column concentration showed a latitudinal band distribution characteristic of increasing from southwest to northeast;the high⁃value areas were primarily distributed in urban areas with low terrain,and the median zone was latitudinally striped with the basic alignment of the Qilian foothills.③The analysis of meteorological conditions revealed that temperature,wind speed,and sunshine hours were positively correlated with O_(3),and relative humidity was negatively correlated with O_(3).④By simulating the airflow transportation trajectory of the receiving point in Wuwei City,it was found that the direction of the O_(3) conveying path was relatively singular;the dominant airflow in each season was primarily in the west and northwest;and the proportions were 71.62%,66.85%,61.22%,and 77.78%,respectively.There were certain seasonal differences in the source areas of O_(3) potential contribution:the high⁃value areas of O_(3) potential sources in spring,summer,and autumn were distributed in Baiyin City and Lanzhou City,which were southeast wind sources,and the high⁃value areas in winter were distributed between the Badain Jaran Desert and the Tengger Desert,which was the north wind source.
作者
李锦超
曹春
方锋
唐千惠
梁膑月
LI Jin-chao;CAO Chun;FANG Feng;TANG Qian-hui;LIANG Bin-yue(Key Laboratory of Resource Environment and Sustainable Development of Oasis,Gansu Province,College of Geography and Environmental Science,Northwest Normal University,Lanzhou 730070,China;Lanzhou Regional Climate Center,Lanzhou 730030,China)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2023年第9期4785-4798,共14页
Environmental Science
基金
国家自然科学基金项目(41861034)
甘肃省绿洲资源环境与可持续发展重点实验室项目
甘肃省自然科学基金项目(20JR10RA454)。
关键词
O_(3)
河西走廊
时空分布
后向轨迹
潜在源区
O_(3)
Hexi Corridor
spatiotemporal distribution
backward trajectory
potential source area
