SEASONAL VARIABILITY OF UPPER OCEAN HEAT CONTENT IN THE NORTH INDIAN OCEAN

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Year:
2017
Type of Publication:
Article
Keywords:
OHC, OHC variability, TCHP, seasons, north Indian Ocean
Authors:
M. Suresh Kumar, C.V Rao M.M. Ali
Abstract:
The thermal energy needed for hurricanes and monsoons come from the upper layers of the oceans, but not from the thin layer represented by sea surface temperature alone. Different ocean layers have different modes of variability of the Ocean Heat Content (OHC) due to the ocean-atmosphere interaction that varies with the ocean depth. However, which layer of the ocean has which type of variability is not precisely known due to the non-availability of the in situ measurements at required spatial and temporal scales.Here, we use the OHC estimated using the remote sensing observations of sea surface height anomalies and sea surface temperature estimated at a spatial scale of 0.25 degrees on daily basis and report the OHC variability of the north Indian Ocean during 1998-2014. Daily, monthly, seasonal and annual variations are estimated for the Arabian Sea (AS) and the Bay of Bengal (BoB) separately. Seven layers (surface to 50m, 100m, 150m, 200m, 300m, 500m and 700m) are considered for this analysis. OHC has both temporal and seasonal variations. The OHC values are high in AS compared to BoB for all months at 50m depth and it isreversed at 700m depth. Tropical Cyclone Heat Potential (TCHP), an integral of OHC from surface to 26 ĚŠCisotherm, has the maximum value in May for both AS, BoB.
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