Oceans occupy almost 3/4th of the surface of our planet. They have
profound impact on climate and weather. SAC has dedicated team of
scientist and researcher for oceanography. The current research
includes Advanced Ocean State Forecast (AOSF) using numerical
models and space-borne observations, Ocean Process Studies, and
development of Data Assimilation (DA) techniques.
1. Advanced Ocean State Forecasting The
centre, generates accurate and timely forecasts of ocean state
using numerical models and DA methods. The Salient activities are
SWAN/WAM based wave forecasting system (assimilating
Altika data) routinely runs and alerts provided through MOSDAC
Data-assimilative circulation system using POM model
also runs routinely and outputs are hosted on MOSDAC website.
Development of capability of setting up very-high
resolution wave and circulation models.
Storm surge forecasts using ADCIRC is now operationally
run to produce the surge forecasts for the coastal area.
High resolution Sea surface temperature and
Salinity from MOM-3 model
2. Ocean Process Studies The
study of the ocean processes is crucial in understanding the ocean
dynamics. Thus several process studies have been undertaken. Some
of them are mentioned below:
Bio-Physical Coupling in Ocean Model is the new
component that has been added to ocean research arena to study
the bio-physical exchange mechanisms
Initiated research on prediction of El Nino using
coupled models. Satellite data are used to study the role of
oceans in cyclone activities during La Nina/El Nina times
Thermal fronts from GHRSST and INSAT-3D SST have been
useful to study ocean mixing
AWARE demonstrated potential renewable energy resource
derived from Jason-2 and Altika altimeters over Indian Ocean
region and the product is hosted on MOSDAC website
Methodology developed to extract wind, wave and sea
level from 40 Hz Altika waveform near the Indian mainland
coastal region. Sample product is hosted on MOSDAC website
RISAT-1 data have been utilized to derive high wind
condition during the cyclone and also ocean features like eddies
and fronts. The study of the ocean processes is crucial in
understanding the ocean dynamics. Several process studies have
Winds over cyclone Megh from RISAT-1
RISAT-1 MRS data (January 2014
At Full Resolution(25m) Diameter of eddy is 6.5
3. Development of the Data Assimilation
Techniques Satellite data are backbone of the ocean
research and forecasting. Some of the activities carried out at
centre the field of DA in ocean models are summarized below:
Singular Evolutive Extended Kalman (SEEK) Filter
implemented in a global ocean model to assimilate SARAL/AltiKa
sea level and Aquarius salinity data.
The polynomial chaos and particle filter data
assimilation techniques are implemented in the coupled
SEEK filter algorithm tested and operationally
implemented in Storm surge model.
Algorithm developed for Ensemble Optimal Interpolation
technique for AOSF.