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Determination of dynamic heights in the Bay of Bengal from XBT profiles and climatological salinities

DRS at CSIR-National Institute of Oceanography

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Title Determination of dynamic heights in the Bay of Bengal from XBT profiles and climatological salinities
 
Creator Ali, M.M.
Gopalakrishna, V.V.
Araligidad, N.
Reddy, G.V.
Salgaonkar, G.
 
Subject ocean currents
geostrophic flow
dynamic height
oceanic eddies
heat transport
XBTs
temperature profiles
climatology
salinity profiles
 
Description Dynamic height (DH) computations are necessary for the estimation of geostrophic currents, heat transport studies, identification of eddies and to validate the altimeter sea surface height (SSH) observations. To compute DHs we need the temperature and salinity profiles to a reasonable deeper level. But, temperature profiles alone, such as from XBT (expendable bathy thermograph), are more numerous than combined temperature and salinity measurements from CTD (conductivity, temperature and depth). To use these voluminous temperature measurements from XBT observations in the computation of DHs, temperature/salinity relations were developed in many oceanic regions. Since such an exercise cannot be carried out in the Bay of Bengal due to the absence of adequate CTD measurements, we have proposed a method of utilizing XBT measurements and climatological (Levitus and Boyer, 1994) salinities to compute the DHs. The approach is demonstrated by replacing the CTD salinities with the climatological salinities. The relative errors compared to the DH signals are 3.8%, 2.7% and 2.6% for 200, 700 and 1000 dbar levels, respectively. The DHs relative to 700 dbar computed using the XBT temperature and climatological salinity profiles are compared with the SSH observations from TOPEX altimeter. The standard deviation of the difference between the DHs computed after converting to geometrical units and SSH is 7.3 cm.
 
Date 2008-02-22T06:39:46Z
2008-02-22T06:39:46Z
2005
 
Type Journal Article
 
Identifier Journal of marine research, Vol.63; 671-682p.
http://drs.nio.org/drs/handle/2264/1019
 
Language en
 
Rights Copyright [2005]. It is tried to respect the rights of the copyright holders to the best of the knowledge. If it is brought to our notice by copyright holder that the rights are voilated then the item would be withdrawn.
 
Publisher Sears Foundation for Marine Research