Knowledge Resource Center for Ecological Environment in Arid Area
| MODIS气溶胶产品在中国陆地区域适用性的评估 | |
| 王莉莉 | |
| 出版年 | 2008 |
| 学位类型 | 硕士 |
| 导师 | 王跃思 |
| 学位授予单位 | 中国科学院大气物理研究所 |
| 中文摘要 | 美国国家航空航天局(National Aeronautics and Space Administration，NASA)发布的中分辨率成像光谱仪(the Moderate Resolution Imaging Spectrometer，简写为MODIS)气溶胶产品首次给出覆盖全球的高空间分辨率气溶胶光学特性资料，为研究全球尺度气溶胶特性提供了更为优越的条件，为进一步研究全球气候变化和区域环境污染提供了必要的基础数据。但是在中国陆地区域，由于缺乏高时空分辨率的地基遥测数据验证，MODIS气溶胶产品在这一地区的精度仍存在很大的不确定性。本文利用中国地区太阳分光观测网(the Chinese Sun Hazemeter Network，简写为CSHNET)的数据作为地面真实值，首次针对中国陆地区域不同生态系统和地理分布评估了MODIS气溶胶光学厚度产品的适用性，并分析了MODIS气溶胶产品版本4和版本5适用性的差异。2004年8月－2006年6月的评估验证结果表明：MODIS气溶胶光学厚度的反演结果和地基遥测数据在整个中国陆地区域相关系数达0.72，44%的数据点在NASA发布的误差线范围内，当气溶胶光学厚度比较小时，MODIS反演结果偏高，但在不同生态区域和地理位置上存在很大差异。在中南部的农田生态系统，MODIS产品和CSHNET数据两者匹配很好，相关性很高，相关系数大于0.82，有大于72％的数据点在NASA发布的期望误差范围内；其次在温带森林、沿海地区、城市郊区以及东北和中部农田地区，两组数据有一定的相关性，相关系数在0.64-0.84之间，有45-73％的数据点在期望误差内；但在北部荒漠、东北偏远农业生态区域、青藏高原和黄土高原、城市地区以及南部森林地区，两组数据相关性很差，并且只有13-54%的数据点在期望误差内；此外，在北部荒漠地区和沿海地区MODIS气溶胶光学厚度反演结果显著高估，而在东北偏远农业生态和南部森林生态地区，MODIS反演结果却出现低估。\nMODIS气溶胶产品版本5与版本4相比，在中国区域有更好的适用性，相关系数达到0.87，斜率与1的偏差仅0.02，截距减小到0.05，并且满足误差范围数据点比例增加到83%；整体看在中国各个不同的生态系统和地理位置版本5的区域平均值小于版本4；在各个不同的生态类型和地理区域，除东北偏远地区外，版本5反演结果的适用性都有很大程度的提高，更具代表性，尤其在中部和南部农业生态，暖温带和亚热带森林，以及沿海地区，相关系数大于0.85，有58～86％的数据点满足误差标准；但是版本5在西北荒漠地区、城市地区的反演结果偏高，而在北部农业生态区域和西南森林反演结果偏低。 |
| 英文摘要 | MODIS (the Moderate Resolution Imaging Spectrometer) aerosol products provided by NASA (National Aeronautics and Space Administration) firstly provide global aerosol optical properties with high spatial resolution, which provide more advantages for researching aerosols on a global scale and basic data for researching global climate change and regional environmental pollution. However, the accuracy of the MODIS aerosol products is still uncertain in China, due to a lack of validation by long-term and large-scale ground-based observations. In this paper, the MODIS aerosol optical depth (AOD) products are evaluated and MODIS Collection 4 (MODIS_C4) and 5 (MODIS_C5) data are compared with the Chinese Sun Hazemeter Network (CSHNET) data as ground truths over different ecological regions in China during the East Asian Study of Tropospheric Aerosols – An International Regional Experiment (EAST-AIRE). The evaluation results within the period of August 2004 to June 2006 show the correlation coefficient (R) between MODIS aerosol products and CSHNET results was 0.72 and 44% of collocated data fell within the expected error lines issued by NASA, in addition, MODIS products were overestimated when aerosol optical depths (AODs) were low over China; however, there were very large differences in the MODIS AOD retrieval between different ecosystems and geographic locations. The most agreement between the MODIS data and that of the CSHNET was in farmland sites in central-southern China, where high correlation (R > 0.82) and large percentages (R2 > 72%) within the expected error lines were found. In temperate forest, coastal regions, suburban regions, and northeast and central farmlands, there appeared moderate agreement, with R~0.64–0.84 and 45–73% of retrieval data falling within the expected errors. The poorest agreement existed in northern arid and semiarid regions, in remote northeast farmlands, in the Tibetan and Loess Plateau, in urban regions, and in southern forests, with 13–54% of retrieval data falling within the expected errors. In addition, the MODIS AOD retrievals were significantly overestimated in the northern arid/semi-arid regions and coastal regions and underestimated in remote northeast farmlands and southern forests. \nCompared with MODIS_C4 data, MODIS_C5 data had better agreement with CSHNET result in China, with R~0.87, the slope of the linear regression line (Sl) varying about 1 ~ 0.02, the offset decreasing to 0.05, and 83% of collocated data within the expected error lines; and the regional averages of MODIS_C5 were lower than those of MODIS_C4 overall in different ecosystems and geographic locations. Furthermore, except in remote northeast farmlands, the results of MODIS_C5 were better corrected and had more representative, especially in central and southern farmlands, temperate and semitropical forests, and coastal regions with R>0.85 and 58-86% of collocated data within the expected error lines. However, the retrievals were still overestimated in the northwest arid/semi-arid regions and urban areas and underestimated in remote northern farmlands and southwest forests. |
| 中文关键词 | MODIS气溶胶产品 ; 中国地区太阳分光观测网（CSHNET） ; 气溶胶光学厚度（AOD） ; 中国陆地生态系统 |
| 语种 | 中文 |
| 国家 | 中国 |
| 来源学科分类 | 大气物理学与大气环境 |
| 来源机构 | 中国科学院大气物理研究所 |
| 资源类型 | 学位论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/286614 |
| 推荐引用方式 GB/T 7714 | 王莉莉. MODIS气溶胶产品在中国陆地区域适用性的评估[D]. 中国科学院大气物理研究所,2008. |
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