Consecutive retrieval of aerosol optical depth and total suspended solid concentration in turbid coastal water of Eastern China

作者：Tan, Xinyao; Sun, Bingqiang^*; Wang, Guochen; Cheng, Tiantao^*; Huang, Kan; Shen, Fang

来源：Journal of Quantitative Spectroscopy and Radiative Transfer, 2022, 287: 108231.

DOI：10.1016/j.jqsrt.2022.108231

• AOD
• Total suspended solid
• Retrieval
• Turbid coastal water
• MODIS

An algorithm is proposed for consecutive retrieval of aerosol optical depth (AOD) and total suspended solid (TSS) concentration in turbid coastal water using a shortwave infrared band and a visible band. MODIS band 7 (similar to 2.1 mu m) was used to retrieve the AOD in turbid coastal water, as the top-of-atmosphere reflectance in this band is more sensitive than in other bands and water-leaving reflectance (rho(w)) can be ignored. The aerosol model is determined through iteration by predetermining the proportion range of four basic aerosol modes (dust, water-soluble, ocean and soot). The retrieved AOD is used for atmospheric correction. Based on the Pearson correlation coefficient between TSS and rho(w) for the different bands, MODIS band 4 was used to obtain rho(w). A logarithmic model associated with TSS retrieval was established between rho(w) and TSS products of GOCI. For the MOD09GA product, the median, moving, adaptive, and Fourier-transform filters were employed to eliminate strip noise with respect to TSS retrieval. The retrieved AOD was strongly correlated with AOD observed at the Huaniao Island site (R = 0.94; RMSE = 0.0437; mean absolute percentage error (MAPE) = 10.9%). The new AOD retrievals are more accurate than MODIS ocean retrievals and can provide missing AOD products in turbid coastal areas. Fourier-filtered TSS has the best retrieval results (RMSE = 1.3538; MAPE = 32.03%) in comparisons between retrieved and in situ TSS.

• 单位
  复旦大学