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Seshasayanan, R.
- Initial set of oceanographic data from Bay of Bengal using an underwater glider as mobile sensor node
Abstract Views :293 |
PDF Views:122
Authors
Shijo Zacharia
1,
R. Seshasayanan
1,
V. Gowthaman
2,
S. Muthukumaravel
2,
Tata Sudhakar
2,
M. A. Atmanand
2
Affiliations
1 College of Engineering, Guindy Campus, Anna University, Chennai 600 025, IN
2 National Institute of Ocean Technology, Ministry of Earth Sciences, Pallikaranai, Chennai 600 100, IN
1 College of Engineering, Guindy Campus, Anna University, Chennai 600 025, IN
2 National Institute of Ocean Technology, Ministry of Earth Sciences, Pallikaranai, Chennai 600 100, IN
Source
Current Science, Vol 109, No 5 (2015), Pagination: 918-929Abstract
Underwater gliders measure high-resolution spatiotemporal oceanographic data. However, glider operations have not been carried out in the Indian Ocean region so far. In September 2013, the National Institute of Ocean Technology, Chennai introduced a mobile sensor node, the underwater glider ‘Barathi’, for observation in the Bay of Bengal (BoB). Herein we address ballasting procedure of the glider operated in highly variable density waters of the BoB. The temperature and conductivity data collected by us are strongly correlated with commercially available instrument with coefficient of determination R2 > 0.97. This article reports results from a long-duration (127 days) mission in 2014. The variation of temperature, salinity, density, sound velocity, mixed layer depth, sonic layer depth and lower cutoff frequency of surface duct along 13°N lat. and between 80.76°E and 86.28°E long. are also presented. The results show a trace of the East Indian Coastal Current. The glider operations demonstrate a novel in situ observation platform in the BoB.Keywords
Mobile sensor node, oceanographic data, underwater glider, underwater acoustics.Full Text
References
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- Design, Development and Validation of Smart Sensor Drifting Node with INSAT Telemetry for Oceanographic Applications
Abstract Views :274 |
PDF Views:106
Authors
Shijo Zacharia
1,
R. Seshasayanan
2,
R. Srinivasan
1,
T. Thamarai
1,
Tata Sudhakar
1,
R. R. Rao
1,
M. A. Atmanand
1
Affiliations
1 National Institute of Ocean Technology, Ministry of Earth Sciences, Pallikaranai, Chennai 600 100, IN
2 College of Engineering, Guindy Campus, Anna University, Chennai 600 025, IN
1 National Institute of Ocean Technology, Ministry of Earth Sciences, Pallikaranai, Chennai 600 100, IN
2 College of Engineering, Guindy Campus, Anna University, Chennai 600 025, IN
Source
Current Science, Vol 106, No 6 (2014), Pagination: 831-840Abstract
Drifter buoys are globally deployed to measure surface meteorological and oceanographic variables. A Lagrangian drifting buoy (Pradyu II) to measure sea-surface temperature and current has been developed at the National Institute of Ocean Technology, Chennai. The drifter buoy with geostationary satellite communication (INSAT-3C) to have near real-time data at every hour is a unique attempt in the history of drifting buoy nodes. This article describes Pradyu II drifting buoy node, design of low-power embedded system, communication network and field test results from an experiment conducted in the Bay of Bengal during March-April 2013. The results from Pradyu II are compared with commercially available drifting buoy (Marlin-Yug), moored data buoy (BD11) and remotely sensed data.Keywords
Drifting Buoy, Embedded System, Seasurface Temperature, Sensor Node.Full Text
- Observed Variability of Surface Layer in the Central Bay of Bengal:Results of Measurements Using Glider
Abstract Views :248 |
PDF Views:107
Authors
Affiliations
1 National Institute of Ocean Technology, Ministry of Earth Sciences, Pallikaranai, Chennai 600 100, IN
2 College of Engineering, Guindy Campus, Anna University, Chennai 600 025, IN
1 National Institute of Ocean Technology, Ministry of Earth Sciences, Pallikaranai, Chennai 600 100, IN
2 College of Engineering, Guindy Campus, Anna University, Chennai 600 025, IN
Source
Current Science, Vol 113, No 11 (2017), Pagination: 2151-2159Abstract
Underwater gliders measure high-resolution spatiotemporal oceanographic data. In April 2014, the National Institute of Ocean Technology, Chennai operated an underwater glider ‘Barathi’, for 127 days for observation of Bay of Bengal (BoB). In this article we present the effectiveness of the glider Barathi for high resolution temporal sampling of the surface layer in the central BoB for studying variation of temperature, salinity and density structures and acoustic characteristics on 26–27 May 2014. The results showed ‘afternoon effect’ on acoustic characteristics and formation of secondary sound channel. Our data set is strongly correlated (coefficient of determination r2 > 0.96) with data from a nearby Array for real-time geostrophic Oceanography (Argo) float.Keywords
Bay of Bengal, Density, Eddy, Glider, Salinity, SLD, MLD, Ocean Observation, Temperature.Full Text
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