Record Details

Satellite and ship studies of phytoplankton in the Northeastern Arabian during 2000 – 2006 period

DRS at CSIR-National Institute of Oceanography

View Archive Info
 
 
Field Value
 
Title Satellite and ship studies of phytoplankton in the Northeastern Arabian during 2000 – 2006 period
 
Creator Matondkar, S.G.P.
Dwivedi, R.M.
Parab, S.G.
Pednekar, S.
Desa, E.S.
Mascarenhas, A.A.M.Q.
Raman, M.
Singh, S.K.
 
Subject Ocean colour monitor,
Arabian Sea
 
Description Sequence of the images from IRS P4 / OCM satellite and extensive shipboard sampling programme are used to understand the seasonal variation of phytoplankton abundance and types in the Northeastern (NE) Arabian Sea and Lakshadweep Sea. An appreciable degree of spatial and temporal variability is observed in chlorophyll a distribution from November to April months, as well as coastal and offshore stations, indicating marked seasonality in phytoplankton distribution in NE Arabian Sea. During November month (fall intermonsoon) average chlorophyll a (Chl a) by fluorometer was (0.799 mgm-3) and by OCM it was 0.584 mgm-3. The higher chlorophyll a observed was due to Trichodesmium (cyanobacteria) blooms. During December the average chlorophyll a was 0.34 mgm-3 also due to Trichodesmium filaments in water column. During January onwards winter cooling led to increase in nutrients which enhanced chlorophyll a value to 0.64 mgm-3due to growth of flagellates (as seen by high chlorophyll b besides chlorophyll a) in water column. February, March and April supported moderately high chlorophyll value (0. 3 to 0.5 mgm-3) due to growth of prasinophytes (as seen by pigment prasinoxanthin) and blooms of the Noctiluca miliaris. Time series monitoring of Noctiluca bloom was also conducted using OCM based chlorophyll images in NE Arabian Sea. During February chlorophyll a retrieved by OCM was 0.3 to 0.9 mgm-3. Pigment analysis of water samples indicated the equal important of accessory pigment like zeaxanthin, prasinoxanthin, ß-carotene. The relevance of these pigments estimated by HPLC like zeaxanthin (cyanobacteria), fucoxanthin (diatoms), peridinin (dinoflagellates) is presented and discussed. Similarly, exercise is conducted in Lakshadweep waters where Trichodesmium related peak in chlorophyll a was observed during March onwards in OCM data. The average chlorophyll a in NE Arabian Sea at surface during November was (0.726 mgm-3), December (0.34 mgm-3), January (0.723 mgm-3), February (0.344 mgm-3), March (0.963 mgm-3) and April 0.665 mgm-3. Similar trend was observed in primary productivity estimates. The attempt is made to work out seasonality in the productivity of the Arabian Sea using OCM derived chlorophyll and relation of enhancement in productivity due to development of winter blooms in the Arabian Sea. The environmental conditions (temperature, wind, nutrients and mixed layer depth) affecting these blooms responsible for year to year variation in bloom biomass and productivity is also presented in detail.
 
Date 2007-04-14T09:04:07Z
2007-04-14T09:04:07Z
2006
 
Type Journal Article
 
Identifier Proceedings of SPIE, vol.6406, 64061I
http://drs.nio.org/drs/handle/2264/584
 
Language en
 
Rights Copyright 2006 Society of Photo-Optical Instrumentation Engineers. This paper was (will be) published in [Proc. of SPIE Vol. 6406, 64061I] and is made available as an electronic reprint (preprint) with permission of SPIE. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
 
Format 654623 bytes
application/pdf
 
Publisher Society of Photo-Optical Instrumentation Engineers