| 利用MODISC6数据分析中国西北地区气溶胶光学厚度时空变化特征 |
| 摘要点击 4689 全文点击 1151 投稿时间：2016-11-21 修订日期：2017-01-21 |
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| 中文关键词 MODIS 气溶胶光学厚度 AERONET 时空特征 西北地区 |
| 英文关键词 MODIS aerosol optical depth(AOD) AERONET spatio-temporal characteristics northwestern China |
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| 中文摘要 |
| 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. |
| 英文摘要 |
| This work compared the collection 6 MODIS aerosol optical depth products with sun photometer data from AERONET, and evaluated the applicability of C6 merged data in the northwest of China. The spatio-temporal variation characteristics and influencing factors of AOD over northwest of China were analyzed by MODIS/AQUA C6 MYD08-M3 products from 2006 to 2015, and the results showed that Southern Xinjiang and Guanzhong region of Shanxi province had relatively high AOD, whereas the south of Qinghai and Gansu province had low values; Junggar Basin was the incremental area of AOD for the first 5 years and second 5 years, whereas converse result existed in Qaidam Basin and Hetao area. Temporally, the yearly mean AOD ranged from 0.18 to 0.22, and the declined trend occurred in 2011, and the annual decrease rate was about 0.32%; Because of different intensity and frequency of dust weather, the south of Xinjiang showed a significant interannual variation characteristic; East of the northwest displayed an obviously declining trend from 2011 to 2015, and the yearly mean decrease was about 1.1%. The AOD in north of Xinjiang and Qinghai-Tibet remained stable. The seasonal changes of AOD among different areas over the northwest had the same trend, all gradually declined from spring to autumn, and increased in winter. |
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