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Variability in current and thermohaline structure off Visakhapatnam during late June 1986

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Title Variability in current and thermohaline structure off Visakhapatnam during late June 1986
 
Creator Kumar, K V Sanil
Sarma, K D K M
Joseph, M X
Viswambharan, N K
 
Description 232-237
Subsurface currents, temperature and salinity at a station off Visakhapatnam (at 10,25,50 and 85 m), Andhra Pradesh, India are monitored for 3 d period using moored Aanderaa RCM-4 current meters. The isotherms configuration indicates upwelling and very low surface temperature ( < 26ᵒC) in the coastal region. The clockwise rotation and diminishing magnitude of residual current vectors from top to bottom, in the presence of southwesterly winds suggest Ekman type of circulation. The currents in the pycnocline are superposed with oscillations around 12 h periodicity. A weak and almost uniform flow field is observed nearer to the bottom. The offshore components of the currents show a net offshore flow in the mixed layer and onshore flow in the pycnocline. Spectral analysis proves that the maximum energy in the oscillations of temperature, salinity and currents, is concentrated in the semi-diurnal tidal frequency band (0.00117 to 0.00156 cycles -1). Surface layer is unstable (Ri < 25) except for a short period. Although, the water column in the middle layer exhibits stable nature spells of instability occur when the current at 50 m opposed the current at 25 m. The Ri in the bottom layer indicates that the water column is always dynamically stable.
 
Date 2016-12-09T10:20:32Z
2016-12-09T10:20:32Z
1989-12
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://nopr.niscair.res.in/handle/123456789/38419
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.18(4) [December 1989]