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Long-term spatiotemporal variations of aerosol optical depth over Yellow and Bohai Sea

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Abstract

In this study, MODerate resolution Imaging Spectroradiometer (MODIS) Collection 6.1 (C6.1) level-2 Dark Target (DT) Aerosol Optical Depth (AOD) observations at 550 nm (AOD550) for the highest quality flag assurance (QA = 3) were obtained to analyze spatiotemporal variations of aerosol optical properties over the Yellow and the Bohai Sea from 2002 to 2017. Spectral AOD observations at 470 nm (AOD470) and 660 nm (AOD660) were obtained to calculate Angstrom Exponent (AE470–660) and classify the aerosol types including clean continental (CC), clean maritime (CM) biomass and urban industrial (BUI), dust (D), and mixed (MXD) aerosol types. Results showed a very distinct spatial pattern of AOD distribution over the Bohai Sea which looks suspicious, i.e., high aerosol loadings (AOD > 0.8) throughout the entire time period, whereas relative low AOD distribution was observed over the adjacent land pixels especially in autumn and winter, which suggested that the DT algorithm might be influenced by a large number of sediments located in the Bohai Sea. Significant differences in spatial distributions were found in different seasons in terms of area coverage as a maximum number of pixels were available during autumn, and regional high and low aerosol loadings were observed during autumn and summer, respectively. Trend analysis from 2002 to 2017 showed that AOD was increased up to 0.04 over the Bohai Sea and decreased up to 0.04 over the Yellow Sea, and this trend varies from month to month. Aerosol classification showed significant contributions of BUI and CC over the region, and contributions of CM, DUST, and MXD aerosols over the Yellow Sea were relatively high compared to the Bohai Sea.

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Acknowledgments

The authors would like to acknowledge the NASA Goddard Space Flight Center for MODIS data. We are thankful to Devin White (Oak Ridge National Laboratory) for the MODIS Conversion Tool Kit (MCTK).

Funding

This research was jointly supported by the National Key Research and Development Program of China (No. 2016YFC1400901), the National Natural Science Foundation of China (Nos. 41576172 and 41506200), the Provincial Natural Science Foundation of Jiangsu in China (Nos. BK20161532, BK20151526, BK20150914), and the National Program on Global Change and Air-sea Interaction (No. GASI-03-03-01-01).

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  1. School of Atmospheric Science, Nanjing University of Information Science and Technology, Nanjing, 210044, China

    Xiaojing Shen

  2. School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, 210044, China

    Muhammad Bilal, Zhongfeng Qiu, Deyong Sun, Shengqiang Wang & Weijun Zhu

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  1. Xiaojing Shen
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  2. Muhammad Bilal
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Correspondence to Zhongfeng Qiu.

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Shen, X., Bilal, M., Qiu, Z. et al. Long-term spatiotemporal variations of aerosol optical depth over Yellow and Bohai Sea. Environ Sci Pollut Res 26, 7969–7979 (2019). https://doi.org/10.1007/s11356-019-04203-4

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