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| Titel |
Coastal sea level response to the tropical cyclonic forcing in the northern Indian Ocean |
| VerfasserIn |
P. Mehra, M. Soumya, P. Vethamony, K. Vijaykumar, T. M. Balakrishnan Nair, Y. Agarvadekar, K. Jyoti, K. Sudheesh, R. Luis, S. Lobo, B. Harmalkar |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 11, no. 1 ; Nr. 11, no. 1 (2015-02-03), S.159-173 |
| Datensatznummer |
250117132
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| Publikation (Nr.) |
 copernicus.org/os-11-159-2015.pdf |
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| Zusammenfassung |
| The study examines the observed storm-generated sea level variation due to
deep depression (event 1: E1) in the Arabian Sea from 26 November to
1 December 2011 and a cyclonic storm "THANE" (event 2: E2) over the Bay of
Bengal during 25–31 December 2011. The sea level and surface meteorological
measurements collected during these extreme events exhibit strong synoptic
disturbances leading to storm surges of up to 43 cm on the west coast and 29 cm
on the east coast of India due to E1 and E2. E1 generated sea level
oscillations at the measuring stations on the west coast (Ratnagiri, Verem
and Karwar) and east coast (Mandapam and Tuticorin) of India with significant
energy bands centred at periods of 92, 43 and 23 min. The storm surge is a
well-defined peak with a half-amplitude width of 20, 28 and 26 h at
Ratnagiri, Verem and Karwar, respectively. However, on the east coast, the sea
level oscillations during Thane were similar to those during calm period
except for more energy in bands centred at periods of ~ 100, 42 and
24 min at Gopalpur, Gangavaram and Kakinada, respectively. The residual sea
levels from tide gauge stations in Arabian Sea have been identified as
Kelvin-type surges propagating northwards at a speed of
~ 6.5 m s−1 with a surge peak of almost constant amplitude.
Multi-linear regression analysis shows that the local surface meteorological
data (daily mean wind and atmospheric pressure) is able to account for
~ 57 and ~ 69% of daily mean sea level variability along the
east and west coasts of India. The remaining part of the variability observed
in the sea level may be attributed to local coastal currents and remote
forcing. |
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