干旱气象

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西北地区 MODIS 气溶胶产品的对比应用分析

胡蝶1张镭2沙莎1王宏斌3   

  1. 1. 中国气象局兰州干旱气象研究所,甘肃省干旱气候变化与减灾重点实验室,中国气象局干旱气候变化与减灾重点开放实验室,甘肃 兰州 730020;
    2. 兰州大学半干旱气候变化教育部重点实验室,兰州大学大气科学学院,甘肃 兰州 730000;
    3. 江苏省气象科学研究所,江苏 南京 210008
  • 出版日期:2013-12-14 发布日期:2013-12-14
  • 作者简介:胡蝶(1985 - ),女,新疆五家渠人,硕士,主要从事卫星遥感和气溶胶辐射特性研究. E - mail:hudie73@ sina. cn
  • 基金资助:

    “十一五”国家科技支撑计划重点项目(2008BAC40B04)、兰州干旱气象研究所科研启动项目(KYS2012SSKY04)及基本科研业
    务费项目共同资助

Contrast and Application of MODIS Aerosol Products over the Arid and Semiarid Region in Northwest China

HU Die1ZHANG Lei2SHA Sha1WANG Hongbin3   

  1. 1. Institute of Arid Meteorology of CMA,Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province,Key Open Laboratory of Arid Climate Change and Disaster Reduction,Lanzhou 730020,China; 2. Key Laboratory for Semi - Arid Climate Change of the Ministry of Education,College of Atmospheric Sciences/Lanzhou University,Lanzhou 730000,China;
    3. Jiangsu Institute of Meteorological Sciences,Nanjing 210008,China
  • Online:2013-12-14 Published:2013-12-14

摘要:

利用气溶胶自动监测网(AERONET)的太阳光度计(CE -318)资料,对 2003 ~2010 年西北干旱半干旱区 MODIS 暗像元算法和深蓝算法 2 种气溶胶光学厚度(AOD)产品进行对比验证,在此基础上进一步研究了该区域 AOD 的空间分布特征及变化趋势。结果表明,MODIS 暗像元算法 AOD 产品在半干旱区原生植被覆盖地表精度优于深蓝算法,而西北干旱区荒漠地表深蓝算法产品精度较高。Aqua - MODIS 深蓝算法 AOD 产品能够较好地给出我国西北荒漠亮地表地区 AOD 的分布及季节变化情况,AOD 高值区多分布在沙尘源区,且春季 AOD 最大。2003 ~2010 年,塔里木盆地、准噶尔盆地和柴达木盆地年均 AOD 分别在 0. 5、0. 4 和 0. 3 附近波动;沙尘区各区域年均 AOD 大多呈现增加趋势。其中,塔里木盆地 AOD 增加趋势较大,而内蒙古西部和准噶尔盆地呈现微弱减少趋势。

关键词: MODIS, 太阳光度计, 气溶胶光学厚度, 干旱半干旱区

Abstract:

 In this study,Aerosol Optical Depth (AOD) at 550 nm from the MODIS sensor on board the Aqua satellite were compared
with sun photometer (CE -318) data from 5 AERONET stations over the arid and semiarid region in northwest China. On this basis,
the spatial distribution characteristics and change trends of the AOD were studied. Results show that AOD with Dark Target algorithm
from MODIS were better than that with Deep Blue algorithm in semiarid areas covered with native vegetations,but AOD with Deep Blue
algorithm from MODIS had higher precision than that with Dark Target algorithm in Hexi Corridor covered mostly with desert. In com-
parison,AOD products with Deep Blue algorithm from Aqua - MODIS were better for retrieving AOD over bright surface of the deserts
in northwest China than that with Dark Target algorithm,so it was used to analyze the distribution and seasonal change of AOD. The
spatial distribution of AOD over the arid and semiarid region in northwest China was far from uniformity,AOD in the dust source re-
gions was large,and the value of AOD was 0. 4 to 0. 8. AOD had obvious seasonal variations,which was the largest in spring. Being
greatly influenced by dust weather,the ration of AOD in the three dust source regions and Hexi Corridor had changed significantly. The
annual averaged AOD had fluctuation around 0. 5,0. 4 and 0. 3 in the Tarim Basin,Junggar Basin and Qaidam Basin from 2003 to
2010,respectively. The annual variations of AOD in dust areas showed mostly increasing trends,and the trend in Tarim Basin was ob-
vious,but it had weak decreasing trends in Junggar Basin and the west of Inner Mongolia.

Key words:  MODIS, sun photometer, aerosol optical depth, arid and semiarid areas

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