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Spatio-temporal distribution of chlorophyll-a in relation to physico-chemical parameters in coastal waters of the northwestern Bay of Bengal

Baliarsingh, SK and Lotliker, AA and Sahu, KC and Sinivasa Kumar, T (2015) Spatio-temporal distribution of chlorophyll-a in relation to physico-chemical parameters in coastal waters of the northwestern Bay of Bengal. Environmental Monitoring and Assessment, 187 (7). ISSN 1573-2959

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Abstract

The present study focuses on understanding the long-term distribution of physico-chemical parameters and their influence on the distribution of chlorophyll-a (chl-a) at a coastal site in the northwestern Bay of Bengal. Chl-a showed large variability (0.12 to 10.05 mg mâ3) on a spatio-temporal scale during the study period. However, the distribution showed a similar pattern with marginal variability from March 2010 to February 2011 and March 2011 to February 2012. The vertical distribution of salinity, pH, total suspended matter (TSM) and chl-a showed systematic temporal variability. However, dissolved oxygen (DO) and nutrients (nitrite + nitrate, phosphate, silicate) did not show any significant spatio-temporal trend. Chl-a showed bimodal distribution on an annual scale, with the first peak appearing during the pre-monsoon period in March due to a seasonal phytoplankton bloom, whereas the second peak occurring during September as a result of nutrient loading from river influx due to monsoonal precipitation. Factor analysis revealed the association of low salinity and high nutrients with chl-a. This infers that the nutrients brought by the influx of river into the study area were fuelling the growth and abundance of phytoplankton. Cluster analysis resulted in two distinct clusters among all physico-chemical datasets, indicating the presence of two distinct areas separated by the 30 m isobath that were strongly influenced by physico-chemical characteristics associated with the seasonal monsoon.

Item Type: Article
Additional Information: Copyright of this article belongs to Springer.
Uncontrolled Keywords: Atmospheric thermodynamics; Chemical analysis; Chlorophyll; Cluster analysis; Dissolved oxygen; Phytoplankton; Silicates, Chlorophyll a; Long-term distribution; Monsoon; Monsoonal precipitation; Physico - chemical parameters; Physicochemical characteristics; SATCORE; Spatiotemporal distributions, Nutrients, chlorophyll a; dissolved oxygen; nitrate; nitrite; phosphate; river water; silicate, chlorophyll a; cluster analysis; coastal zone; factor analysis; monsoon; nutrient dynamics; physicochemical property; spatiotemporal analysis; vertical distribution, algal bloom; Article; cluster analysis; coastal waters; factorial analysis; India; nutrient loading; pH; precipitation; salinity; seasonal variation; spatial analysis; suspended particulate matter; temporal analysis; time series analysis, Bay of Bengal; Indian Ocean
Subjects: Oceanography > oceanography
Depositing User: INCOIS Library
Date Deposited: 17 Aug 2015 10:51
Last Modified: 17 Aug 2015 10:51
URI: http://moeseprints.incois.gov.in/id/eprint/2854

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