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Prasad, K. V. S. R.
- Shallow Water Wave Characteristics during Laila Cyclone Using Satellite and In-situ Wave Measurements
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International Journal of Innovative Research and Development, Vol 1, No 10Sp (2012), Pagination: 390-397Abstract
Extreme weather events like cyclones cause severe damage to coasts by inducing very high waves. Studies of such waves are important for several coastal processes. Satellite altimetry data used to study one of such extreme events LAILA cyclone during the year 2010 over Bay of Bengal. This cyclone caused severe erosion along the coast and of course first ever severe cyclone crossed Andhra coast since may- 1990. The satellite altimetry data showed that prolonged high waves during and after the cyclone. The in-situ observations show wave heights up to 3m under the influence of cyclone. The satellite altimetry gridded data performs well with In-situ data. Keywords: Coastal processes, Erosion, Extreme events, Satellite altimetry, Wave heights- Upper Ocean Thermal Features during Tropical Cyclones over Bay of Bengal
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Authors
Venkata Ramu
,
K. V. K. R. K. Patnaik
,
K. V. S. R. Prasad
,
S. V. V. Arun Kumar
,
P. S. N. Acharyulu
Source
International Journal of Innovative Research and Development, Vol 1, No 10Sp (2012), Pagination: 525-536Abstract
The upper ocean is dramatically affected during tropical cyclones (TCs). Cyclones interact not only with the surface but also with the deeper oceans, the depth depending upon the strength of the wind mixing. Hence, it is necessary to consider the thermal structure of the upper ocean for cyclone studies. Rapid intensification of cyclone Nargis in the Bay of Bengal from category-1 to category-4 within 24 hours was attributed to the presence of a pre-existing warm SSHA evidenced by the insitu (Argo data) and altimeter observations. The warmer layers of 26°C extended up to 100 m beneath the surface such as Isothermal layer depth (ILD) and barrier layer thickness (BLT) and Upper Ocean Heat Content (UOHC) during the cyclone progression were computed. The rate of intensification and final intensity of cyclones are sensitive to the initial spatial distribution of the mixed layer. The most apparent effect of TC passage is noted by the marked SST cooling, and the response of the ocean mixed layer temperature typically 1 to 6°C towards the right of the storm track. In the present work, the response of Upper Ocean to the tropical cyclones over Bay of Bengal based on the satellite Altimetry, ARGO, RAMA buoys and QUICKSCAT forced (MOM-GODAS) data. The present studies suggest the use of sea surface height anomalies (SSHA) data derivable from satellite altimeters are more useful instead of sea surface temperatures in the atmospheric models, particularly, in the cyclone and coupled models.- Seasonal Behaviour of Upper Ocean Freshwater Content in the Bay of Bengal:Synergistic Approach Using Model and Satellite Data
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Authors
Smitha Ratheesh
1,
Rashmi Sharma
1,
K. V. S. R. Prasad
2,
Neeraj Agarwal
1,
Rashmi Sharma
1,
V. S. R. Prasad
2
Affiliations
1 Space Applications Centre, Oceanic Sciences Division, Ahmedabad 380 058, IN
2 Department of Meteorology and Oceanography, Andhra University, Visakhapatnam 530 003, IN
1 Space Applications Centre, Oceanic Sciences Division, Ahmedabad 380 058, IN
2 Department of Meteorology and Oceanography, Andhra University, Visakhapatnam 530 003, IN
Source
Current Science, Vol 115, No 1 (2018), Pagination: 99-107Abstract
Any Change In Precipitation, Evaporation And River Discharge, By Virtue Of Its Impact On The Distribution Of Ocean Salinity, Leaves Its Inevitable Signature On The Freshwater Content (fwc) In The Oceans. In This Study, Synergistic Use Of Satellite Data And Numerical Ocean Circulation Model Is Explored To Examine The Seasonality Of Fwc Of The Upper 30 M Water Column Of The Bay Of Bengal (bob). For This Purpose, First The Sea Surface Salinity (sss) From Aquarius Is Assimilated Into A Model Of The Indian Ocean. Strength Of Assimilation Is Judged By Comparing Simulated Sss With Satellite And Argo Datasets. An Overall Improvement Of 39% Is Observed In Sss Over Free Run Of The Model Without Data Assimilation. Next, The Focus Is Shifted To The Spatial And Temporal Variability Of Fwc Of The Upper 30 M Of Bob In Relation To The Different Components Of Freshwater Forcing. A Delay Of Three Months In The Peak Of Fwc Is Observed With Respect To The Peak Of Net Freshwater Influx For Bob As A Whole. However, The Nature Of The Response Of Fwc To The Total Freshwater Input Forcing In The Major River-dominated Regions Of Bob Is Different From That For The Whole Bob. The Relative Role Of River Influx In Controlling Fwc In These Regions Is Well Brought Out In The Study. For The Ganga–brahmaputra Region, River Run-off Is Observed To Be A Crucial Parameter In Regulating Fwc, Whereas For Both Irrawaddy River Region And Central Bob, Precipitation Dominates The Response. The Response Of Salinity In The Uppermost Part Of The Northern Bob To The Total Freshwater Input Is Much More Rapid Than In The Other Regions.Keywords
Freshwater Content, Sea Surface Salinity, Seasonal Variability, Upper Ocean Region.References
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- Retrieval of High-Resolution Nearshore Bathymetry from Sentinel-2 Twin Multispectral Imagers using a Multi-Scene Approach
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Authors
Surisetty V. V. Arun Kumar
1,
Ch. Venkateswarlu
2,
B. Sivaiah
2,
K. V. S. R. Prasad
2,
Rashmi Sharma
1,
Raj Kumar
1
Affiliations
1 Earth, Ocean, Atmosphere, Planetary Sciences and Applications Area, Space Applications Centre (ISRO), Ahmedabad 380 015, IN
2 Department of Meteorology and Oceanography, Andhra University, Visakhapatnam 530 004, IN
1 Earth, Ocean, Atmosphere, Planetary Sciences and Applications Area, Space Applications Centre (ISRO), Ahmedabad 380 015, IN
2 Department of Meteorology and Oceanography, Andhra University, Visakhapatnam 530 004, IN