宁夏吸收性气溶胶时空分布及其影响因素研究

Studying on spatial and temporal distribution of absorbent aerosols and its influencing factors in Ningxia

基于2008~2017a每天的OMI Level-2数据产品,对宁夏回族自治区吸收性气溶胶指数(UVAI)时空分布特征进行了研究,并对其环境因子(自然与人类活动)进行了相关性分析及冗余分析.结果表明:宁夏回族自治区近10a UVAI空间格局为西北向东南区域逐步递减,UVAI高值区域一直分布在中卫市全境及吴忠市、银川市和石嘴山市的大部分区域.每年的UVAI月变化均呈现"V"型,四季变化特征为冬季>秋季>春季>夏季,2013a是UVAI由低值向高值突变的年份,2017年UVAI达到十年最高值.结合Theil-Sen Median趋势分析和Mann-Kendall检验结果:季节变化趋势为春季无显著减少,夏季无显著增加,秋季极显著增加,冬季表现为显著增加和极显著增加;年际变化趋势表现为逐年增加,且5市UVAI增加程度不同.UVAI空间变化稳定性呈现由中卫市向南北两边逐渐降低,高低差异显著的分布格局,变异系数区间为0.293~0.442.影响因素中,温度对气溶胶气团存活时间影响最大,能源消耗结构,产业总值及第二产业(工业、建筑业)对气溶胶的生成具有重要影响,降水的影响次之.平均风速、最大风速对宁夏回族自治区高空中气溶胶气团的停留时间表现为较大的负相关.

Based on the daily OMI Level-2data products from 2008 to 2017,the spatial and temporal distribution characteristics of the Ultraviolet Aerosol Index(UVAI)in Ningxia Hui Autonomous Region were studied,and the correlation analysis and redundancy analysis of its environmental factors were performed.The results showed that the spatial pattern of UVAIwas gradually decreased from the northwest to the southeast of Ningxia Hui Autonomous Region in past decade,and the high UVAI regions were distributed throughout Zhongwei City,and most of Wuzhong City,Yinchuan City,and Shizuishan City.The monthly variation ofUVAI presented a"V"shape in each year.The characteristics of the four seasons were winter>autumn>spring>summer.In 2013,UVAI abruptly changed from a low value to a high,andit reached the highest in 2017.Theil-Sen Median trend analysis and Mann-Kendall test results showed that seasonal variation was no significant decrease in spring,no significant increase in summer,however,it showed a significantor extremely significant increase in autumn and winter.Otherwise,the study analyzed the trends and found that the concentration of absorptive aerosols was increasing year by year in Ningxia Hui Autonomous Region,and UVAI increased in different degrees in the five cities.The stability of the UVAI variation gradually decreased from Zhongwei City to the north and south with a significant difference in height,the coefficient of variation ranged from 0.293 to 0.442.Among the influencing factors,temperature hadthe greatest impact on the survival time of high aerosol air masses,the energy consumption structure,the total industrial value,and the secondary industry(industrial,construction industry)had a important impact on the generation of aerosols,followed by the impact of precipitation.The average wind speed and maximum wind speed showed a significant negative correlation with the residence time of the upper aerosol air mass in Ningxia Hui Autonomous Region.