Abstract
Ocean colour remote sensing is one of the conventional methods in satellite oceanography used to study the biological response of the upper ocean to the tropical cyclones. This paper aims to study the impact of the Very Severe Cyclonic storm PHAILIN, and its consequence on the surface chlorophyll-aconcentration distribution in the Bay of Bengal using Oceansat-2 Ocean Colour Monitor (OCM). The impact of this cyclone on ocean primary productivity has been studied using MODIS-A data. Sea surface temperature (SST) plays an important role in the generation of primary productivity along with the other oceanographic parameters; SST patterns in the Bay of Bengal during the cyclone period were studied. From the analysis, it is observed that the chlorophyll-aconcentration has increased from 1.08 (before) to 7.06 mg/m3 after the cyclone with an SST drop of ~3°C (29.19°C to 26°C). The primary productivity has increased from 410.0506 to 779.9814 mg/C/m2/day after the cyclone. In addition to the above analysis, an attempt has also been made to study the impact of cyclone intensity on the chlorophyll concentration. The study shows that the comparison between cyclone intensity (CI) and chlorophyll concentration shows a positive relationship.
Highlights
Tropical cyclones are one of the episodic disturbances which influences on both the abundance and productionHow to cite this paper: Preethi Latha, T., Rao, K.H., Nagamani, P.V., Amminedu, E., Choudhury, S.B., Dutt, C.B.S. and Dadhwal, V.K. (2015) Impact of Cyclone PHAILIN on Chlorophyll-a Concentration and Productivity in the Bay of Bengal
In order to compute the chlorophyll concentration along the cyclone track, the data was gridded in a 2 × 2 degree box for each track point, Sea Surface Temperature (SST) data along the track was taken from NOAA AVHRR with a resolution of 0.25 × 0.25, and 8-day composites of primary productivity data of MODIS-A derived from Vertically GPM [16] model with a resolution of 4 km has been used in the study
As the SST has increased from 28 ̊C to 29.16 ̊C ocean thermal condition was well favored for the genesis of the cyclone PHAILIN in the Bay of Bengal [17]
Summary
Tropical cyclones are one of the episodic disturbances which influences on both the abundance and productionHow to cite this paper: Preethi Latha, T., Rao, K.H., Nagamani, P.V., Amminedu, E., Choudhury, S.B., Dutt, C.B.S. and Dadhwal, V.K. (2015) Impact of Cyclone PHAILIN on Chlorophyll-a Concentration and Productivity in the Bay of Bengal. These cyclonic disturbances show the strong winds and heavy rainfall. In terms of biological consequences, the cyclone wind field causes local mixing which results in the injection of nutrients into the upper layer of the ocean and triggering phytoplankton blooms [2] [3]. Satellite remote sensing provides information on several parameters such as sea surface temperature, wind speed and ocean color datasets like chlorophyll-a concentration and primary productivity to study the phenomena of cyclones. Optical remote sensing limits in capturing the entire cyclone event as the sensors obscured by the clouds
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