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Unnikrishnan, A. S.
- Sea-Level-Rise Trends off the Indian Coasts during the last Two Decades
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PDF Views:76
Authors
Affiliations
1 CSIR-National Institute of Oceanography, Dona Paula, Goa 403 004, IN
2 LOCEAN Laboratory, Sorbonne Universités (UPMC, Univ Paris 06), CNRS–IRD–MNHN, IPSL, Paris, FR
1 CSIR-National Institute of Oceanography, Dona Paula, Goa 403 004, IN
2 LOCEAN Laboratory, Sorbonne Universités (UPMC, Univ Paris 06), CNRS–IRD–MNHN, IPSL, Paris, FR
Source
Current Science, Vol 108, No 5 (2015), Pagination: 966-971Abstract
The present communication discusses sea-level-rise trends in the north Indian Ocean, particularly off the Indian coasts, based on estimates derived from satellite altimeter and tide-gauge data. Altimeter data analysis over the 1993-2012 period reveals that the rate of sea-level rise is rather spatially homogeneous over most of the north Indian Ocean, reaching values close to global mean sea-level-rise trend (3.2 mm yr-1) estimated over the same period. The only notable exception lies in the northern and eastern coasts of the Bay of Bengal, which experience larger trends (5 mm yr-1 and more). These recent trends derived from altimeter data are higher than those estimated from tide-gauge records over longer periods during the 20th century. This communication calls for an improved understanding of the mechanisms behind this accelerated sea-level-rise recorded over the past two decades, that could either be a direct response to global warming or a result from an aliasing by the natural variability.Keywords
Global Warming, Natural Variability, Sea-Level-Rise Trend, Satellite Altimetry, Tide-Gauges.Full Text
- Perigean spring tides along the Indian coast
Abstract Views :139 |
PDF Views:78
Authors
Affiliations
1 Shreyas Co-operative Housing Society, Rego Bagh, P.O. Bambolim Complex, Goa 403 202, India, IN
1 Shreyas Co-operative Housing Society, Rego Bagh, P.O. Bambolim Complex, Goa 403 202, India, IN
Source
Current Science, Vol 123, No 8 (2022), Pagination: 1050-1053Abstract
Sea level measurements from tide-gauges, installed in harbours along the Indian coast by the Survey of India, are used to illustrate the differences in high tides during spring tides that occurred during lunar perigee and apogee (closest and farthest position of the moon in its elliptical orbit around the earth) in January and August 1974 respectively. The difference in maximum tidal heights between 9 January and 4 August of the year for Mumbai tidal record is about 87 cm, whereas for Chennai, Visakhapatnam and Paradip, the differences vary between 20 and 25 cm. Kochi record shows a difference of about 13 cm, whereas the difference in predicted high tides at Bhavnagar is more than 1 m. Similar results are found for March and April 1980 during spring tides close to perigee and apogee respectively. Perigean spring tides can cause flooding in low-lying coastal areas along the northern parts of the Indian coast, which will get enhanced in future with mean sea-level rise due to global warmingFull Text
References
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- Unnikrishnan, A. S., Nidheesh, A. G. and Lengaigne, M., Sea-level-rise trends off the Indian coasts during last two decades. Curr. Sci., 2015, 108(5), 966–971.
- Swapna, P., Ravichandran, M., Nidheesh, G., Jyothi, J., Sandeep, N., Deepa, J. S. and Unnikrishnan, A. S., Sea-level rise. Assessment of climate change over the Indian region. A report of the Ministry of Earth Sciences, Government of India, 2020, pp. 175–189; Springer Open; https://doi.org/10.1007/978-981-15-4327-2_9.
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- Climate Change Impacts on the Coastal Regions
Abstract Views :52 |
PDF Views:40
Authors
Affiliations
1 Shreyas Co-Operative Housing Society, Rego Bagh, P.O. Bambolim Complex, Goa 403 202, IN
1 Shreyas Co-Operative Housing Society, Rego Bagh, P.O. Bambolim Complex, Goa 403 202, IN
Source
Current Science, Vol 125, No 4 (2023), Pagination: 361-362Abstract
No Abstract.Keywords
No Keywords.Full Text
References
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- Fox-Kemper, B. et al., In Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change (eds Masson-Delmotte, V. et al.), Cambridge University Press, Cambridge, UK, 2021, pp. 1211–1362; doi:10.1017/9781009157896.011.
- Cooley, S. et al., In Climate Change 2022: Impacts, Adaptation and Vulnerability. Contribution of Working Group II to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change (eds Portner, H. O. et al.), Cambridge University Press, Cambridge, UK, 2022, pp. 379–550; doi:10.1017/9781009325844.005.
- Chatterjee, A. and Shenoy, L. R., Ocean Sci., 2022, 18, 639–657; https://doi.org/10.5194/os-18-639-2022.
- Sweet, W., Park, J., Marra, J., Zervas, C. and Gill, S., Sea level rise and nuisance flood frequency changes around the United States, NOAA Technical Report NOS CO-OPS 073, National Oceanic and Atmospheric Association, 2014, p. 66; http://tidesandcurrents.noaa.gov/publications/NOAA_Technical_Report_NOS_COOPS_073.pdf
- Vinayachandran, P. N., Seng, D. C. and Schmid, A., In Blue Economy. An Ocean Science Perspective (eds Urban Jr, E. R. and Ittekkot, V.), Springer, Singapore, 2022, pp. 341–378; ISBN 978-981-19-5064-3; https://doi.org/10.1007/978-981-19-5065-0
- Unnikrishnan, A. S., Tangang, F. and Durreheim, R. J. (eds), Extreme Natural Events. Sustainable Solutions for Developing Countries, Springer Nature, Singapore, 2022, p. 455; ISBN 978-981-19-2510-8; https://doi.org/10.1007/978-981-19-2511-5.
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