Understanding the Spatial Variability of Chlorophyll a and Total Suspended Matter Distribution Along the Southwest Bay of Bengal Using In-Situ and OCM-2 & MODIS-Aqua Measurements |
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| Authors: | D Poornima R Shanthi S Raja G Vijayabaskara Sethubathi T Thangaradjou T Balasubramanian K N Babu A K Shukla |
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| Institution: | 1. Centre of Advanced Study in Marine Biology, Faculty of Marine Sciences, Annamalai University, Parangipettai, 608 502, Tamilnadu, India
2. Marine, Geo and Planetary Sciences Group, Space Applications Centre (ISRO), Ahmedabad, 380 015, India
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| Abstract: | Spatial and temporal distribution of chlorophyll a (chl a) and Total Suspended Matter (TSM) and inter comparison of Ocean Color Monitor-2 (OCM-2) and Moderate Resolution Imaging Spectro-radiometer (MODIS-Aqua) derived chlorophyll a and TSM was made along the southwest Bay of Bengal (BoB). The in-situ chl a and TSM concentration measured during different seasons were ranged from 0.09 to 10.63 μgl?1 and 11.04–43.75 mgl?1 respectively. OCM-2 and MODIS derived chl a showed the maximum (6–8 μgl?1) at nearshore waters and the minimum (0–1 μgl?1) along the offshore waters. OCM-2 derived TSM imageries showed the maximum (50–60 mgl?1) along the nearshore waters of Palk Strait and the moderate concentration (2–5 mgl?1) was observed in the offshore waters. MODIS derived minimum TSM concentration (13.244 mgl?1) was recorded along the offshore waters, while the maximum concentration of 15.78 mgl?1 was found along the Kodiakarai region. The inter-comparison of OCM-2 and MODIS chl a data (R 2 ?=?0.549, n?=?49, p?<?0.001, SEE?=?±0.117) indicate that MODIS data overestimates chl a concentration in the nearshore waters of the southern BoB compared to the OCM-2. The correlation between OCM-2 and MODIS-Aqua TSM data (R 2 ?=?0.508, N?=?53, P?<?0.001 and SEE?=?±0.024) confirms that variation in the range of values measured by OCM-2 (2–60 mgl?1) and the MODIS (13–16 mgl?1) derived TSM values. Despite problems in range of measurements, persistent cloud cover etc., the launch of satellites like OCM-2 with relatively high spatial resolutions makes job easier and possible to monitor chl a distribution and sediment discharges on day to day basis in the southwest BoB. |
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