Dipanjan Chaudhuri Postdoctoral Scholar dchaudhuri@apl.uw.edu |
Research Interests
Physical and observational oceanography, oceanographic instrumentation, tropical cyclones, air-sea interaction, statistical signal processing.
Education
Bachelor of Engineering Instrumentation and Electronics Engineering, Jadavpur University, 2009
Masters of Engineering Electrical Engineering, Jadavpur University, 2012
Ph.D. Climate Science, Indian Institute of Science, Bangalore, 2020
Publications |
2000-present and while at APL-UW |
Near-inertial response of a salinity-stratified ocean Chaudhuri, D., D. Sengupta, E. D'Asaro, J.T. Farrar, M. Mathur, and S. Ranganathan, "Near-inertial response of a salinity-stratified ocean," J. Phys. Oceanogr., 54, 1841-1855, doi:10.1175/JPO-D-23-0173.1, 2024. |
More Info |
1 Sep 2024 |
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We study the near-inertial response of the salinity-stratified north Bay of Bengal to monsoonal wind forcing using 6 years of hourly observations from four moorings. The mean annual energy input from surface winds to near-inertial mixed layer currents is 1020 kJ m-2, occurring mainly in distinct synoptic "events" from AprilSeptember. A total of fifteen events are analyzed: Seven when the ocean is capped by a thin layer of low-salinity river water (fresh) and eight when it is not (salty). The average near-inertial energy input from winds is 40% higher in the fresh cases than in the salty cases. During the fresh events, 1) mixed layer near-inertial motions decay about two times faster and 2) near-inertial kinetic energy below the mixed layer is reduced by at least a factor of three relative to the salty cases. The near-inertial horizontal wavelength was measured for one fresh and one salty event; the fresh was about three times shorter initially. A linear model of near-inertial wave propagation tuned to these data reproduces 2); the thin (10 m) mixed layers during the fresh events excite high modes, which propagate more slowly than the low modes excited by the thicker (40 m) mixed layers in the salty events. The model does not reproduce 1); the rapid decay of the mixed layer inertial motions in the fresh events is not explained by the linear wave propagation at the resolved scales; a different and currently unknown set of processes is likely responsible. |