Record Details

Nutrient characteristics of the water masses and their seasonal variability in the eastern equatorial Indian Ocean

DRS at CSIR-National Institute of Oceanography

View Archive Info
 
 
Field Value
 
Title Nutrient characteristics of the water masses and their seasonal variability in the eastern equatorial Indian Ocean
 
Creator Sardessai, S.
Shetye, S.
Maya, M.V.
Mangala, K.R.
PrasannaKumar, S.
 
Subject Thermohaline characteristics
Water masses
Dissolved oxygen
Nutrient characteristics
Nitrate deficit
 
Description Nutrient characteristics of four water masses in the light of their thermohaline properties are examined in the eastern Equatorial Indian Ocean during winter, spring and summer monsoon. The presence of low salinity water mass with ‘Surface enrichments’ of inorganic nutrients was observed relative to 20 m in the mixed layer. Lowest oxygen levels of 19 mu M at 3 degrees N in the euphotic zone indicate mixing of low oxygen high salinity Arabian Sea waters with the equatorial Indian Ocean. The seasonal variability of nutrients was regulated by seasonally varying physical processes like thermocline elevation, meridional and zonal transport, the equatorial undercurrent and biological processes of uptake and remineralisation. Circulation of Arabian Sea high salinity waters with nitrate deficit could also be seen from low N/P ratio with a minimum of 8.9 in spring and a maximum of 13.6 in winter. This large deviation from Redfield N/P ratio indicates the presence of denitrified high salinity waters with a seasonal nitrate deficit ranging from -4.85 to 1.52 in the Eastern Equatorial Indian Ocean
 
Date 2010-08-10T09:11:34Z
2010-08-10T09:11:34Z
2010
 
Type Journal Article
 
Identifier Marine Environmental Research, vol.70(3-4); 272-282
http://drs.nio.org/drs/handle/2264/3695
 
Language en
 
Rights An edited version of this paper was published by Elsevier. Copyright [2010] Elsevier
 
Publisher Elsevier