珠江三角洲城市地区MODIS气溶胶光学厚度产品的检验分析

黄健; 李菲; 邓雪娇; 毕雪岩; 谭浩波

珠江三角洲城市地区MODIS气溶胶光学厚度产品的检验分析

中国气象局广州热带海洋气象研究所,广东广州 510080

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摘要

摘要: 根据2004年1—11月地面太阳光度计的气溶胶光学厚度的观测数据，对美国航空航天局(NASA)发布的中分辨率成像光谱仪气溶胶光学厚度产品(MODIS AOD C004)在珠江三角洲城市地区的准确性进行了检验，并分析了造成MODIS AOD误差的可能原因。分析结果表明：⑴ MODIS AOD的误差在NASA的预期误差范围内，MODIS AOD可作为气候变化的研究和区域大气污染监测的有效手段。⑵ 与世界上其他地区的检验结果类似，MODIS AOD在珠江三角洲城市地区存在一定的系统性偏差：当AOD较小时，MODIS AOD值大多高估，而当AOD比较大时，MODIS AOD值偏低，这一系统性偏差大于全球平均偏差。其中广州和南海的偏差最为显著，东莞和番禺次之。⑶ 导致MODIS AOD在珠江三角洲城市地区出现较大系统性偏差的原因包括：珠江三角洲工业化和城市化的发展，使地表的植被覆盖率已大幅减少，MODIS AOD反演所采用的地表反照率估算值可能偏小；气溶胶模型中设定的单散射反照率值偏高，低估了珠江三角洲城市地区气溶胶的吸收性。
- 珠江三角洲 /
- MODISAOD /
- 太阳光度计 /
- 检验分析

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