interannual variability in the arabian sea warm pool and its response to varying surface forcing

31 Pages·2006·1.84 MB·English

INTERANNUAL VARIABILITY IN THE ARABIAN
SEA WARM POOL AND ITS RESPONSE TO
VARYING SURFACE FORCING
Bijoy Thompson, C. Gnanaseelan,
R. Deepa, J. S. Chowdary and P.S. Salvekar
Objective
Introduction
MMooddeell
Results
Summary
Objectives
(cid:153)To compare the warm pool structure during
contrasting monsoons 2002 and 2003.
(cid:153)To understand the interannual variability in the
warm pool.
(cid:153)To study the winter time temperature inversions
in the SEAS.
MONTHLY SST CLIMATOLOGY (LEVITUS 98)
CLIMATOLOGICAL SST (LEFT) & 50 m HEAT CONTENT (RIGHT) 1010 J/m2
Model
(cid:190)The model used is Princeton Ocean Model (POM)
(cid:190)POM is a general circulation model as well as a
coastal ocean model for the North Indian Ocean
(20oS to 25oN, 35oE to 115oE).
(cid:190)Three dimensional sigma co-ordinate, free surface,
primitive equation model.
(cid:190)Zonal and meridional resolution of 1o x 1o
(cid:190)High vertical resolution with 21 sigma levels
Data sets
(cid:190)ETOPO5 - 5-Minute ocean depth land elevation.
(cid:190)Annual climatology of temperature &salinity
(Levitus1998).
(cid:190)Monthly climatological wind from Southampton
Oceanographic Center (1998).
(cid:190)Monthly climatological surface heat fluxes from
Oberhuber (COADS).
For interannual simulations
(cid:190)Monthly Air Temperature, Humidity from NCEP
Reanalysis.
(cid:190)Daily Surface wind from Quikscat Sea Winds
(cid:190)Daily Outgoing Longwave Radiation from NCEP CPC.
(cid:190)Model is integrated for the period 1999-2004.
(cid:190)Daily Sea Surface Temperature from TMI satellite
ARMEX 2003 (March –April)
Cross sections
&
Time series
Shenoi et al., (2005)
TIME – DEPTH SECTION OF TEMPERATURE AT TSL (9.21oN, 74.5oE)
MODEL
ARMEX