A decadal regional and global trend analysis of the aerosol optical depth using a data-assimilation grade over-water MODIS and Level 2 MISR aerosol products
A decadal regional and global trend analysis of the aerosol optical depth using a data-assimilation grade over-water MODIS and Level 2 MISR aerosol products
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DOI：
10.5194/acp-10-10949-2010
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发表时间：
2010-11
影响因子：
6.3
通讯作者：
Jianglong Zhang;J. Reid
中科院分区：
文献类型：
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作者：
Jianglong Zhang;J. Reid
抽象。使用10年（2000 - 2009年）的数据同化（DA）质量Terra MODIS和MISR气溶胶产品，以及7年的Aqua MODIS，我们研究了区域和全球海洋气溶胶的趋势。这包括产品的业务和数据同化等级版本。在对两种MODIS仪器的辐射校准中出现的气溶胶信号漂移进行校正后，我们发现MODIS和MISR在统计上可以忽略不计的全球趋势为± 0.003/每十年。我们的研究还表明，在印度湾的孟加拉，亚洲东海岸和阿拉伯海的AOD显示增加的趋势0.07，0.06和0.06每十年的MODIS，分别。这些区域趋势被认为是显著的，置信水平高于95%。从MISR中发现了类似的增加趋势，但相对幅度较小。这些趋势反映了每个区域气溶胶事件的光学强度分别增加：中国东海岸和印度孟加拉湾的人为气溶胶;以及阿拉伯海沙尘事件的更强影响。在中美洲、北美洲东海岸和非洲西海岸发现了负的AOD趋势，置信水平低，这表明需要更长时间的观察才能得出结论。
Abstract. Using the ten-year (2000–2009) Data-Assimilation (DA) quality Terra MODIS and MISR aerosol products, as well as 7 years of Aqua MODIS, we studied both regional and global aerosol trends over oceans. This included both operational and data assimilation grade versions of the products. After correcting for what appears to be aerosol signal drift from the radiometric calibration of both MODIS instruments, we found MODIS and MISR agreed on a statistically negligible global trend of ±0.003/per decade. Our study also suggests that AODs over the Indian Bay of Bengal, east coast of Asia, and Arabian Sea show increasing trends of 0.07, 0.06, and 0.06 per decade for MODIS, respectively. These regional trends are considered as significant with a confidence level above 95%. Similar increasing trends were found from MISR, but with less relative magnitude. These trends reflect respective increases in the optical intensity of aerosol events in each region: anthropogenic aerosols over the east coast of China and Indian Bay of Bengal; and a stronger influence from dust events over the Arabian Sea. Negative AOD trends, low in confidence levels, are found off Central America, the east coast of North America, and the west coast of Africa, which indicate that longer periods of observation are necessary to be conclusive.