利用MODIS C6数据分析中国西北地区气溶胶光学厚度时空变化特征

发布时间：2018-02-09 01:38

本文关键词： MODIS 气溶胶光学厚度 AERONET 时空特征西北地区　出处：《环境科学》2017年07期 　论文类型：期刊论文

【摘要】：通过与AERONET太阳光度计站点数据进行对比验证,确认了MODIS C6 AOD融合产品在西北地区的适用性.利用2006~2015年MODIS/AQUA C6 MYD08-M3产品分析中国西北地区气溶胶光学厚度的时空变化特征和形成原因.结果表明:(1)从空间分布特征来看,塔里木盆地和关中盆地是高值区,青海南部、甘肃西南部是低值区;准噶尔盆地是前后5年年均AOD对比增量区,柴达木盆地和河套地区是对比减量区.(2)从时间变化特征来看,近10年西北地区年均AOD变化范围为0.18~0.22,2011年起呈缓慢下降趋势,平均年降幅约为0.32%;南疆地区呈现较为明显的年际变化特征,与沙尘天气强弱、频次的年份分布直接相关;东部地区在2011~2015年,下降趋势显著,平均年降幅达到1.1%;北疆和青藏地区年均AOD整体保持平稳;西北地区不同区域AOD季节变化均呈现从春季至秋季逐步下降,冬季再次回升的相同关系.
[Abstract]:By comparing the data with the AERONET solar photometer site, The applicability of MODIS C6 AOD fusion product in Northwest China is confirmed. The spatial and temporal variation characteristics of aerosol optical thickness in Northwest China are analyzed by using MODIS/AQUA C6 MYD08-M3 product from 2006 to 2015. The results show that MODIS C6 AOD fusion product is based on the spatial distribution characteristics. The Tarim basin and the Guanzhong basin are high value areas, the southern part of Qinghai and southwest Gansu are low value areas, the Junggar basin is the annual average annual AOD correlation increment area for five years, and the Qaidam basin and Hetao basin are the contrast reduction areas. In the last 10 years, the average annual AOD in Northwest China is 0.180.22, which has been decreasing slowly since 2011, and the average annual decrease is about 0.32.The southern Xinjiang shows obvious interannual variation characteristics, which is directly related to the year distribution of dust weather and frequency. During the period from 2011 to 2015 in the eastern region, the decreasing trend was significant, the average annual decrease was 1.1%, the average annual AOD remained stable in northern Xinjiang and Qinghai-Xizang, and the seasonal variation of AOD in different regions of Northwest China decreased gradually from spring to autumn. Winter rebounds again in the same relationship.
【作者单位】：中国科学院寒旱区陆面过程与气候变化重点实验室;中国科学院西北生态环境资源研究院;中国科学院大学;
【基金】：国家自然科学基金委重大专项培育项目(91437108)
【分类号】：X513

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