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Estimation of Vertical Heat Diffusivity at the Base of the Mixed Layer in the Bay of Bengal
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2020
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Source: Journal of Geophysical Research: Oceans, 125(5)
[PDF-5.76 MB]
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Journal Title:Journal of Geophysical Research: Oceans
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Description:One approach to estimating vertical heat diffusivity (KT) is to compute it from
the residual of the mixed layer (ML) heat budget. Based on this approach, we use moored buoy
data at 15°N, 12°N, and 8°N along 90°E over the period of 2007–2018 to estimate the seasonal average
of KT at the base of the mixed layer in the Bay of Bengal (BoB). We find that KT is lower during
spring and higher during winter compared to summer and fall at the mooring locations. Moreover, KT
is generally higher in the southern BoB compared to the northern BoB. The present study also
shows that the seasonal and spatial variability of KT is modulated both by stratification at the base
of ML and by seasonal and spatial heterogeneity in atmospheric forcing, most notably wind stress
and buoyancy flux. The availability of information on the spatial and seasonal variability of KT in
the BoB will facilitate evaluation and validation of turbulent mixing parameterization schemes
incorporated into ocean models.
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Source:Journal of Geophysical Research: Oceans, 125(5)
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