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Dial variations in temperature, salinity and dissolved oxygen from the neritic waters off Cochin during April (peak summer)

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Relation http://eprints.cmfri.org.in/5145/
 
Title Dial variations in temperature, salinity and dissolved oxygen from the neritic waters off Cochin during April (peak summer)
 
Creator Selvaraj, G S D
Rajagopalan, M S
Anilkumar, R
 
Subject Seawater study
 
Description Dial variations of important hydrographic parameters were studied continuously
for 7 days at a 100 m depth station off Cochin. The frequency of observations varied
from 1-3 hourly intervals. In surface waters, the ranges in temperature, salinity and
dissolved oxygen values recorded during 10-17 April were 30.64°-32.36°C, 34.56-
34.68 X lO''' and 4.06-4.65 ml/1 respectively. Tlie STD profiles in the diurnal study
revealed clearly the premonsoon warming (30°-31°C) in the upper 0-30 m depth
zone. In the water column up to 50 m depth, mean salinity values ranged from 34.6
to 35 X 10 while dissolved oxygen values were above 4 mI/1. Time series observations
on the production and utilisation of dissolved oxygen revealed wide fluctuation
from hour to hour. Vertical gradients in the diurnal study indicated the existence of
thermocline around 60 m depth with sharp decline in temperature and dissolved
oxygen and increase in salinity below 60 m. The diurnal variation on the distribution
of temperature and dissolved oxygen exhibited significant rhythmic tidal impulse of a
semi-diurnal wave pattern which was more prominent in the bottom layer below 60 m.
 
Date 1996
 
Type Conference or Workshop Item
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/5145/1/10.pdf
Selvaraj, G S D and Rajagopalan, M S and Anilkumar, R (1996) Dial variations in temperature, salinity and dissolved oxygen from the neritic waters off Cochin during April (peak summer). In: Second workshop on scientific results of FORV Sagar Sampada, 15-17 February 1994, Kochi.