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Impact of improved momentum transfer coefficients on the dynamics and thermodynamics of the north Indian Ocean

Parekh, A and Gnanaseelan, C and Jayakumar, A (2011) Impact of improved momentum transfer coefficients on the dynamics and thermodynamics of the north Indian Ocean. Journal of Geophysical Research C: Oceans, 116 (1).

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Abstract

Long time series of in situ observations from the north Indian Ocean are used to compute the momentum transfer coefficients over the north Indian Ocean. The transfer coefficients behave nonlinearly for low winds (<4 m/s), when most of the known empirical relations assume linear relations. Impact of momentum transfer coefficients on the upper ocean parameters is studied using an ocean general circulation model. The model experiments revealed that the Arabian Sea and Equatorial Indian Ocean are more sensitive to the momentum transfer coefficients than the Bay of Bengal and south Indian Ocean. The impact of momentum transfer coefficients on sea surface temperature is up to 0.3 °C-0.4°C, on mixed layer depth is up to 10 m, and on thermocline depth is up to 15 m. Furthermore, the impact on the zonal current is maximum over the equatorial Indian Ocean (i.e., about 0.12 m/s in May and 0.15 m/s in October; both May and October are the period of Wyrtki jets and the difference in current has potential impact on the seasonal mass transport). The Sverdrup transport has maximum impact in the Bay of Bengal (3 to 4 Sv in August), whereas the Ekman transport has maximum impact in the Arabian Sea (4 Sv during May to July). These highlight the potential impact of accurate momentum forcing on the results from current ocean models.

Item Type: Article
Additional Information: Copyright of this article belongs to American Geophysical Union.
Uncontrolled Keywords: Arabian Sea; Bay of Bengal; Ekman transport; Empirical relations; Equatorial Indian Ocean; In-situ observations; Indian ocean; Linear relation; Long time series; Mass transport; Mixed layer depths; Model experiments; Ocean general circulation models; Ocean model; Potential impacts; Sea surface temperatures; South Indian Ocean; Sverdrup transport; Thermocline depth; Transfer coefficient; Upper ocean; Zonal currents, Atmospheric temperature; Momentum; Momentum transfer; Rain; Thermodynamics; Time series, Oceanography, Ekman transport; experimental study; in situ measurement; mass transport; mixed layer; momentum transfer; oceanic general circulation model; sea surface temperature; thermocline; thermodynamics; time series; upper ocean; nonlinearity; oceanic current, Indian Ocean; Indian Ocean (North)
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 12 Aug 2014 05:22
Last Modified: 12 Aug 2014 05:22
URI: http://moeseprints.incois.gov.in/id/eprint/676

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