International Journal of Marine and Environmental Sciences (Volume 1 Issue 1)
 Associations between Aerosol Types and Chlorophyll-a Concentration over Coastal Area in East Asia from Satellite Observations IJMES
Pages 15-24

Wei-Hung Lien, Tang-Huang Lin, Gin-Rong Liu, Kuo-Hsin Tseng, Fu-an Tsai and Chian-Yi Liu

Published: 13 December 2017
This study improved significantly the relationship between aerosol optical depth (AOD) and sea surface chlorophyll-a concentration (Chl-a), after considering the effects of sea surface temperature (SST), ocean surface current (OSC) and type of aerosols. The decadal satellite-retrieved Orbview-2/SeaWiFS Chl-a and Terra/MODIS AOD550nm data (from March 2000 to December 2010) were used to investigate the impact of atmospheric aerosols on the Chl-a concentration in the coastal water around the region of East Asia(equator to 75°N and from 100°E to 180°E). Two sets of sequential areas (A1 to A10 and B1 to B9) were selected for examining and excluding the influence of SST and OSC. After taking the potential location of aerosol deposition from OSC into account, an obvious correlation between AOD550nm and Chl-a concentration was demonstrated around the site of study area A. For aerosol partition, the Normalized Gradient Aerosol Index (NGAI) was applied to MODIS AOD products for aerosol type identification and mixed status determination. The results indicated that the type of mineral dust (DS) significantly increases the Chl-a while the biomass burning (BB) aerosols may restrain the Chl-a. This seems to be a non-impact of anthropogenic pollutant (AP) on Chl-a within the surface layer. The other area, B (B1 to B9), next to the region of area A, also shows similar results with high consistency; thus, the significant impact of DS aerosols on Chl-a production is suggested over the coastal region of East Asia.
Sea surface temperature, Ocean surface current, Aerosol optical depth, Chlorophyll-a concentration, Normalized gradient aerosol index.