A5031803664- Oceanographic and Atmospheric Processes
- Ocean Waves and Remote Sensing
- Tropical and Extratropical Cyclones Research
- Climate variability and models
- Geomagnetism and Paleomagnetism Studies
- Astro and Planetary Science
- Solar and Space Plasma Dynamics
- Marine and fisheries research
- Underwater Acoustics Research
- Earthquake Detection and Analysis
- Coastal and Marine Dynamics
- Geophysics and Gravity Measurements
- Ionosphere and magnetosphere dynamics
- Arctic and Antarctic ice dynamics
- Scientific Research and Discoveries
Indian Institute of Science Bangalore
2018-2024
University of Washington Applied Physics Laboratory
2019-2024
Indian National Centre for Ocean Information Services
2020
Scripps Institution of Oceanography
2020
University of California, San Diego
2020
National Centre for Antarctic and Ocean Research
2019
National Institute of Ocean Technology
2019
Oceanography Society
2016
Recent observations of surface meteorology and exchanges heat, freshwater, momentum between the ocean atmosphere in Bay Bengal are presented.These characterize air-sea interaction at 18°N, 89.5°E from December 2014 to January 2016 also other locations northern Bengal.Monsoonal variability dominated records, with winds northeast summer southwest winter.This included a strong annual cycle atmospheric forcing Bengal, winter monsoon marked by sustained heat loss resulting cooling, storm events...
Continuous time-series measurements of near surface meteorological and ocean variables obtained from Research Moored Array for African-Asian-Australian Monsoon Analysis Prediction (RAMA) moorings at 15°N, 90°E; 12°N, 8°N, 90°E an Ocean buoy Network Northern Indian (OMNI) mooring 18°N, are used to improve understanding air-sea interaction processes mixed layer (ML) temperature variability in the Bay Bengal (BoB) seasonal time scales.Consistent with earlier studies, this analysis reveals that...
Abstract Cyclone Phailin, which developed over the Bay of Bengal in October 2013, was one strongest tropical cyclones to make landfall India. We study response salinity-stratified north Phailin with help hourly observations from three open-ocean moorings 200 km cyclone track, a mooring close daily sea surface salinity (SSS) Aquarius , and one-dimensional model. Before arrival moored showed shallow layer low-salinity water lying above deep, warm “barrier” layer. As winds strengthened,...
contributing to seasonal and longerterm storage, transport, vertical mixing of heat, both in exchange with the atmosphere melting sea ice.Though different latitude temperature, Arctic Ocean Bay
Winds generate inertial and near-inertial currents in the upper ocean.These dominate kinetic energy contain most of vertical shear horizontal currents.Subsequent instabilities lead to mixing.In Bay Bengal, annual mean wind input mixed layer is almost as large mid-latitude storm tracks.Also, mixing associated with these waves known affect heat content, sea surface temperature, and, thus, precipitation coupled global models.Therefore, mechanisms leading decay below are considerable...
Abstract We study the near-inertial response of salinity-stratified north Bay Bengal to monsoonal wind forcing using 6 years hourly observations from four moorings. The mean annual energy input surface winds mixed layer currents is 10–20 kJ m −2 , occurring mainly in distinct synoptic “events” April–September. A total fifteen events are analyzed: Seven when ocean capped by a thin low-salinity river water (fresh) and eight it not (salty). average 40% higher fresh cases than salty cases....
Abstract Tropical cyclones are among the most destructive natural disasters. However, lack of detailed observations and simplifications inherent in operational ocean models, lead to incomplete knowledge underlying processes. Using high‐fidelity large‐eddy simulations moored away from storm track, we show that mutually interacting shear convective processes, govern evolving state upper ocean. Our simulation agrees well with observed sea surface temperature salinity. Shear driven turbulence...
Abstract A year‐long mooring data are used to study the upper ocean unstable events and instabilities at 18°N 89°E, which is a climatologically important region in North Bay of Bengal. Near‐surface stability studied from context buoyancy frequency normalized shear ( V z / N ) reduced S 2 −4 convenient measures quantify flow stability, compared more widely Richardson number R i ). The analysis carried out across three contrasting time periods, monsoon, postmonsoon, winter year 2012. Although...
Horizontal currents in the Bay of Bengal were measured on eight cruises covering a total 8600 $km$ using 300 $kHz$ Acoustic Doppler Current Profiler (ADCP). The are distributed over multiple seasons and regions Bay. wavenumber spectra these depths 12--54 m wavelengths from 2--400 km decomposed into vortical divergent components assuming isotropy. An average across along track all shows that spectral slope horizontal kinetic energy for 10--80 scales with an exponent $-1.7 \pm 0.05$, which...
Abstract We study the nature of ocean currents forced by summer monsoon winds in Bay Bengal using data from two cruises within a pool low‐salinity (<32 psμ) river water, and one cruise outside pool. Upper (5–70 m) temperature, salinity, velocity profiles were measured at sub‐kilometer horizontal resolution along 800–1800‐km‐long tracks. find that beneath density stratification 5–15 m depth can be 10 times stronger than typically seen much subtropical or tropical ocean. The shallow...
July 3–4 —A moderate storm began at 00 h 40 m GMT, 3, with a sudden increase of 0′.4 in westerly D and 14 gammas H , decrease 3 Z . to rise slowly till 03 36 when there was steep 26 gammas. Thereafter it 07 16 second sharp At 30 further 27 reach its maximum 32 3.
February 1–2 —;A moderate disturbance began at about 07 h GMT, 1. H reached a minimum value 20 08 m , 1, and the storm ended 10, 2. Ranges: D 5″.3; 114 gammas; Z 29 gammas. 6–7 —A of great intensity 04 43 6. to fall rapidly from 54 6, 13 Two prominent humps were recorded between .5 15 16 17 . The practically 01 .5, 7. 7″.1; 196 53
July 4–5 —A moderate disturbance began with a sudden commencement at 12 h 02 m GMT, 4, in which the initial movement H was +10 gammas. reached minimum value 13 58 , 4. Two conspicuous bays were noticeable during periods 20 56 to 21 55 on 4 and from 04 19 05 34 5. The ended 08