高原气象

高原气象 >

2016 , Vol. 35 >Issue 3: 810 - 822

DOI: https://doi.org/10.7522/j.issn.1000-0534.2015.00043

论文

中国地区MODIS气溶胶产品的验证及反演误差分析

  • 王宏斌 ,
  • 张镭 ,
  • 焦圣明 ,
  • 张志薇 ,
  • 朱毓颖 ,
  • 朱承瑛
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  • 中国气象局交通气象重点实验室, 江苏省气象科学研究所, 南京 210009;2. 兰州大学半干旱气候变化教育部重点实验室, 大气科学学院, 兰州 730000;3. 江苏省气象服务中心, 南京 210008

收稿日期: 2014-09-11

  网络出版日期: 2016-06-28

基金资助

国家科技支撑计划(2014BAG01B02,2014BAG01B01,2014BAC22B04);北极阁基金(BJG201505);中国气象局气溶胶与云降水重点开放实验室开放课题(KDW1303)

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Evaluation of the MODIS Aerosol Products and Analysis of the Retrieval Errors in China

  • WANG Hongbin ,
  • ZHANG Lei ,
  • JIAO Shengming ,
  • ZHANG Zhiwei ,
  • ZHU Yuying ,
  • ZHU Chengying
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  • Key Laboratory of Transportation Meteorology of China Meteorological Administration, Jiangsu Institute of Meteorological Sciences, Nanjing 210009, 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 Meteorological Service Center, Nanjing 210008, China

Received date: 2014-09-11

  Online published: 2016-06-28

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摘要

利用中国地区AERONET(AErosol RObotic NETwork)地基观测资料对Terra/Aqua MODIS(ModerateResolution Imaging Spectroradiometer)气溶胶产品精度进行验证,提供资料可靠性分析,并分析了各地区MODIS 反演气溶胶光学厚度(Aerosol Optical Depth,AOD)的误差来源,为进一步改进算法提供依据。结果表明:(1)香河、兴隆、榆林、寿县、合肥、香港和台湾等站点MODIS AOD的质量较好。对大多数站点,Terra 和Aqua MODIS AOD质量差别不大,除个别站点Terra 略优于Aqua。(2)选取香河、太湖、SACOL、北京、兴隆和台湾成功大学站进行详细分析。香河站Terra 和Aqua MODIS AOD质量均较好,相关系数分别为0.96 和0.97,且落在期望误差内的百分数分别为72%和65%。太湖和北京站MODIS AOD存在统一高估现象,可以通过拟合直线的截距对其进行订正,得到较接近真实值的AOD。SACOL,Terra 和Aqua MODIS AOD与AERONET AOD的相关系数分别为0.66 和0.77,且存在一定的高估。同时验证SACOL MODIS Deep Blue AOD,总体上其精度低于MODIS C005 AOD。兴隆和成功大学站反演误差均小于期望误差,数据质量较好。(3)误差分析表明香河和SACOL站的MODIS反演误差主要来自地表反射率关系的不合适;太湖和北京站的反演误差可能是由于地表和气溶胶模型两方面的共同作用导致的。个别站点随着云量增大,MODIS反演结果对AOD的高估也越大。

关键词： MODIS; AERONET; 气溶胶光学厚度; 反演

本文引用格式

王宏斌 , 张镭 , 焦圣明 , 张志薇 , 朱毓颖 , 朱承瑛 . 中国地区MODIS气溶胶产品的验证及反演误差分析[J]. 高原气象, 2016 , 35(3) : 810 -822 . DOI: 10.7522/j.issn.1000-0534.2015.00043

Abstract

By using sunphotometer(AERONET)data as ground truth,the MODIS AOD from both Terra and Aqua in China were evaluated.The error sources of retrieval algorithm were investigated and analyzed.The results show that:(1)Xianghe,Yulin,Shouxian,Hefei,Hong Kong and Taiwan sites MODIS AOD accuraciesare better than other sites.We compared Terra and Aqua AOD data separately to AERONET data,and found no significant differences.(2)MODIS AOD at Xianghe,Taihu,SACOL,Beijing,Xinglong and Chen-Kung_Univ sites was selected for detailed analysis.As compared to other sites,MODIS AOD at Xianghe site shows much closer to the 1:1 line,and higher correlations(0.96 and 0.97 for Terra and Aqua,respectively).In addition,72% and 65% of the MODIS retrievals of the comprehensive data set lie within the expected error for Terra and Aqua,respectively.MODIS AOD was overestimated,and can be revised using the intercept of the fitted line at Taihu and Beijing site.At SACOL,the relationship between Terra and Aqua MODIS AOD and AERONET AOD is poor;with the correlation coefficient is 0.66 and 0.77,respectively.MODIS C005 AOD products precision is higher than Deep Blue AOD product precision at SACOL.(3)Error analysis shows error mainly from surface reflectance relationship inaccurate,at Xianghe and SACOL.At Taihu and Beijing sites,retrieval errors may be due to effect of both surface and aerosol model.The majority of cases have low cloud fraction and there is no significant bias,however,MODIS overestimates AOD when cloud fraction is higher.

Key words： MODIS; AERONET; Aerosol optical dept; Retrieval

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