Abstract
Upper layer heat content (HC) in the tropical Indian Ocean (TIO) extending from 40°E to 120°E and 20°S to 30°N was estimated from satellite observations of sea surface temperature and sea level anomaly (SLA). For this estimation, a regression relation was developed from long-period observations of subsurface temperature profiles derived by Argo floats. It was assumed that a reduced gravity approximation is appropriate for representing the oceanic upper layer. Satellite-based HC was computed on a monthly basis and was validated with various independent in situ observations in the TIO. The correlation between satellite and in situ estimates was found to be reasonably good. It was also found that signatures of several dipole events during the study period were well reflected in the estimates. Propagating features such as Kelvin and Rossby waves were also quite clearly visible in the corresponding Hovmoller diagrams.
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