Impact of above-cloud aerosol on low cloud optical properties

Wenzhong Zhang; Tao Luo; Shengcheng Cui; Xuebin Li; Yinbo Huang; Wenyue Zhu

doi:10.1117/12.2557494

17 April 2020 Impact of above-cloud aerosol on low cloud optical properties

Wenzhong Zhang, Tao Luo, Shengcheng Cui, Xuebin Li, Yinbo Huang, Wenyue Zhu

Proceedings Volume 11455, Sixth Symposium on Novel Optoelectronic Detection Technology and Applications; 1145506 (2020) https://doi.org/10.1117/12.2557494
Event: Sixth Symposium on Novel Photoelectronic Detection Technology and Application, 2019, Beijing, China

Abstract

Above-low-cloud aerosol (ACA) has important impacts on low clouds bellow. Based on the satellite data from 2007 to 2010, this study analyzed the relationship between ACA optical depth (OD), ACA occurrences and low cloud integrated color ratio (CR) over tropic Atlantic region where ACA frequently occurs. The results show that, the integrated attenuated CR (IACR) of low cloud is about 30%-50% larger over smoke region in smoke outbreak seasons than other regions or seasons. However, the IACR of low cloud over dust region shows small difference between dust outbreak seasons and other seasons. It indicates that above-low-cloud smoke aerosol can introduce stronger color effect than dust. The integrated corrected CR (ICCR) of low cloud tends to decrease with increasing above-cloud dust OD, while the low cloud ICCR shows weak relationship with above-low-cloud smoke OD. And, the above-low-cloud dust aerosol could introduce strong microphysics effect, that is, the low cloud droplet size may decrease with increasing burden of dust aerosol above.

Citation Download Citation

Wenzhong Zhang, Tao Luo, Shengcheng Cui, Xuebin Li, Yinbo Huang, and Wenyue Zhu "Impact of above-cloud aerosol on low cloud optical properties", Proc. SPIE 11455, Sixth Symposium on Novel Optoelectronic Detection Technology and Applications, 1145506 (17 April 2020); https://doi.org/10.1117/12.2557494

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