西北五省区不同土地覆被类型近地表ρ(NH_(3))时空特征分析  

Temporal and spatial characteristics of near surface NH_(3) mass concentrations of different land covers in the five northwest provinces of China

作　　者：席睿鹏 刘磊 焦继宗[1] 颉耀文[1] 杨宇宇 刘璞 XI Rui-peng;LIU Lei;JIAO Ji-zong;XE Yao-wen;YANG Yu-yu;LIU Pu(College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]兰州大学资源环境学院,兰州730000

出　　处：《兰州大学学报（自然科学版）》2021年第6期735-742,共8页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金项目(42001347,41471163);国家重点研发计划项目(2018YFC1903700);中央高校基本科研业务费专项资金项目(lzujbky-2020-71)。

摘　　要：利用红外大气探测干涉分光仪NH_(3)柱浓度数据产品耦合化学传输模型和高斯拟合方法反演2008-2016年西北五省区近地表ρ(NH_(3)),对反演结果进行反距离加权插值提高分辨率;使用空间分区统计方法分析不同土地覆被类型的近地表ρ(NH_(3))时空变化特征和原因.结果表明,卫星反演结果跟实测数据相比略有偏大,整体比较一致;西北五省区近地表年均ρ(NH_(3))整体呈上升趋势, 2016年达到最大值6.97μg/m3;不同区域近地表年均ρ(NH_(3))存在空间异质性且变化情况不同,高值区域出现在新疆塔里木盆地西部和北部的边缘绿洲地区、甘肃兰州市、宁夏北部河套平原地区、陕西渭河平原中部地区;西北五省区近地表月均ρ(NH_(3))呈现季节性周期变化,每年的夏季近地表ρ(NH_(3))值达到最大,冬季近地表ρ(NH_(3))最低;不同土地覆被类型的近地表ρ(NH_(3))存在明显差异,大小次序依次为不透水面、农田、灌丛、林地、湿地、贫瘠区、草地、冰雪区、水体.The surface NH_(3) mass concentrations in Northwest China from 2008 to 2016 were retrieved with the coupling chemical transport model and infrared atmospheric sounding interferometer. The inverse distance weighted interpolation was performed on the satellite-derived surface NH_(3) mass concentrations to improve the spatial resolution and the geospatial statistical method used to analyze the characteristics of and reasons behind the temporal and spatial changes in the near surface NH_(3)mass concentrations in different land cover types. Satellite-retrieved surface NH_(3) mass concentration were slightly larger than the measured data;the average annual surface NH_(3) mass concentration over the five northwest provinces showed an overall upward trend since 2008, reaching a maximum value of 6.97 μg/m;in 2016.There was a notable spatial heterogeneity of surface NH_(3) mass concentrations in different regions. High surface NH_(3) mass concentrations appeared in the marginal oasis areas of western and northern Tarim Ba-sin, Lanzhou City of Gansu Province, Hetao plain area of northern Ningxia and the central area of the Weihe plain of Shaanxi Province. Surface NH_(3) mass concentrations in the five northwest provinces showed distinct seasonal changes, reaching their maximums in summer and minimums in winter respectively. Surface NH_(3) mass concentrations over different land cover types were significantly different, the order being impervious surface, farmland, shrub, woodland, wetland, barren area, grassland, ice, snow area and water body. The results were the first systematic report of surface NH_(3)mass concentration in western China, which is of great significance for an objective understanding of the temporal and spatial pattern changes of NH_(3)mass concentration in arid areas of China.

关 键 词：近地表NH 质量浓度 卫星观测 红外大气探测干涉分光仪 西北五省区 

分 类 号：P412[天文地球—大气科学及气象学]