Record Details

Observations on bio-optical properties of a phytoplankton bloom in coastal waters off Cochin during the onset of southwest monsoon

NOPR - NISCAIR Online Periodicals Repository

View Archive Info
 
 
Field Value
 
Title Observations on bio-optical properties of a phytoplankton bloom in coastal waters off Cochin during the onset of southwest monsoon
 
Creator Bhagirathan, Usha
Shaju, S.S.
Ragesh, N.
Meenakumari, B.
Ashraf, Muhamed P.
 
Subject Bloom
Phytoplankton
Specific absorption coefficient
Cochin coast
 
Description 289-296
A
phytoplankton bloom dominated by Chaetoceros spp. was detected in the
Arabian Sea, off Cochin coast during May 2009 coinciding the onset of southwest
monsoon with an average chlorophyll a concentration of 8.42 mg m-3
at four stations (A, C, D & E) of total 7 stations studied in coastal
waters situated between latitudes 9º54’-10º02’ N and longitudes 76º05’-76º12’
E. All the stations were resampled after seven days and found that the average
chlorophyll a concentration at the bloom stations has decreased to 2.91
mg m-3. The inherent optical properties (chlorophyll a,

specific
phytoplankton absorption coefficient, chlorophyll scattering coefficient) of
water were analyzed from the study area. The physico-chemical parameters like
dissolved oxygen, pH, turbidity and nutrients were estimated for surface waters
in these stations using standard methods. The phytoplankton of the study area
was identified and their density was recorded. The phytoplankton community
composed primarily of diatom Chaetoceros sp. in all the stations, with a
percentage composition greater than 55 at the bloom. The highest phytoplankton
density recorded was 4,89,578 cell no./l at station D. Samples from the bloom
showed higher specific phytoplankton absorption coefficient [a*c()] than
other stations. a*c(435) varied from 4.11 to 5.68 m2mg-1
and a*c (665) from 1.45 to 1.80 m2mg-1. A
survey on purse

seine
fishery showed a higher pelagic catch in close proximity to the bloom area
during this period. Further investigation of absorption properties of blooms
using remote sensing at complex case II waters is needed to interpret
bio-optical

properties
as well as fisheries. The present study is the first attempt of this kind off Cochin coast.
 
Date 2014-03-03T06:48:06Z
2014-03-03T06:48:06Z
2014-02
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/27269
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.43(2) [February 2014]