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

Sardess, S. and Shetye, Suhas and Maya, M. V. and Mangala, K. R. and Prasanna Kumar, S. (2010) Nutrient characteristics of the water masses and their seasonal variability in the eastern equatorial Indian Ocean. Marine Environmental Research, 70 (3-4). pp. 272-282. ISSN 0141-1136

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

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Abstract

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 μM at 3°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.

Keywords:Equatorial Indian Ocean, Thermohaline characteristics, Chemical properties, Water masses, Seasonal variability, N/P Ratio, Nitrate deficit
Subjects:F Physical Sciences > F790 Ocean Sciences not elsewhere classified
F Physical Sciences > F700 Ocean Sciences
Divisions:College of Science > School of Geography
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ID Code:29689
Deposited On:20 Dec 2017 09:03

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