EGU General Assembly 2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Dissipation in the Bay of Bengal from a Seaglider

Gillian Damerell, Peter Sheehan, Rob Hall, Adrian Matthews, and Karen Heywood
Gillian Damerell et al.
  • Centre for Ocean and Atmospheric Sciences, University of East Anglia, Norwich, United Kingdom

In July 2016, a Seaglider equipped with a microstructure sensor system was deployed in the southern Bay of Bengal at 7° 54.0′ N, 89° 4.5′ E.  162 profiles (of which 146 were to 1000 m) of microstructure shear and temperature were collected as a time series at the same location.  Dissipation is calculated independently from both shear and temperature.  The time-average profile shows high dissipation (nearly 1×10-5 W kg-1) near the surface, dropping rapidly over the uppermost 50 m to ~1×10-7 W kg-1, followed by a more gradual decrease to ~5×10-10 W kg-1 at 300m.  A band of slightly higher dissipation around 500 m (~8×10-10 W kg-1) could facilitate an increased vertical flux of nutrients, heat, salinity, etc at these depths.  From 600 to 1000 m dissipation remains roughly constant at ~1×10-10 W kg-1.  Variability of the near surface dissipation in response to atmospheric forcing is also discussed.

How to cite: Damerell, G., Sheehan, P., Hall, R., Matthews, A., and Heywood, K.: Dissipation in the Bay of Bengal from a Seaglider, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-1295,, 2021.


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