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Spectra and gross features of vertical temperature and salinity profiles off the central west coast of India

DRS at CSIR-National Institute of Oceanography

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Title Spectra and gross features of vertical temperature and salinity profiles off the central west coast of India
 
Creator Varkey, M.J.
Nagarajan, R.
 
Subject Oceanography and Limnology
vertical mixing
spectra
wave number
structures
statistics
vertical profiles
salinity profiles
continental slope
temperature
ISW, India, West Coast
 
Description Continuous vertical profiles of temperature and salinity recorded by a CTD-system from the continental slope and the continental rise off Goa, west coast of India, were used for delineating the gross statistical features of the fine structure and to understand the underlying physical processes. Spectra of temperature and salinity fluctuations from the different stations showed similar patterns and trend of decrease to a wave length of about 10 m, generally with a crest like feature at 20 m wave length. The estimates of spectral density for temperature and salinity were comparatively very high for low wave numbers and showed a difference varying from 1.5 to 2 decades. The spectra for the range 0-0.11 cy/m computed using the perturbation series from a first difference filter and corrected for the filter-response followed an average slope of - 2.9 (range: - 2.57 to - 3.43 and std. dev.: - 0.3) and - 2.6 (range: - 2.05 to - 3.15 and std. dev.: - 0.36) with correlation coefficients - 0.96 and - 0.92 for temperature and salinity, respectively. Coherency estimates were high ( 0.8) for the range 0-0.02 cy/m and were independent of the distance between stations showing the spatial homogeneity of low wave number processes. Correlation coefficients between T' and S' and the individual standard deviations for different layers increased with increasing filter length and generally decreased with depth. Both hoizontal and vertical mixing processes were very active in the upper water column (0-250 m). In the deeper layers, 500 m, non-isopycnal mixing processes were found to be active
 
Date 1995-05-21T10:01:10Z
2017-09-29T13:48:27Z
1995-05-21T10:01:10Z
2017-09-29T13:48:27Z
1985
 
Type Journal Article
 
Identifier Mausam, vol.36; 1985; 57-66
0252-9416
http://drs.nio.org/drs/handle/2264/6369
 
Language en
 
Relation Mausam
SCI
 
Publisher India Meteorological Department