Intensification of tidally generated internal waves in the north-central Bay of Bengal.

Tytuł:: Intensification of tidally generated internal waves in the north-central Bay of Bengal.
Autorzy:: Jithin AK; Indian National Centre for Ocean Information Services (INCOIS), Hyderabad, 500090, Telangana, India. .; Department of Meteorology and Oceanography, Andhra University, Visakhapatnam, 530003, Andhra Pradesh, India. .
Subeesh MP; National Centre for Polar and Ocean Research (NCPOR), Vasco-da-Gama, Goa, 403 804, India.
Francis PA; Indian National Centre for Ocean Information Services (INCOIS), Hyderabad, 500090, Telangana, India.
Ramakrishna SSVS; Department of Meteorology and Oceanography, Andhra University, Visakhapatnam, 530003, Andhra Pradesh, India.
Źródło:: Scientific reports [Sci Rep] 2020 Apr 08; Vol. 10 (1), pp. 6059. Date of Electronic Publication: 2020 Apr 08.
Typ publikacji:: Journal Article; Research Support, Non-U.S. Gov't
Język:: English
Imprint Name(s):: Original Publication: London : Nature Publishing Group, copyright 2011-
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Entry Date(s):: Date Created: 20200410 Date Completed: 20200904 Latest Revision: 20210408
Update Code:: 20240105
PubMed Central ID:: PMC7142159
DOI:: 10.1038/s41598-020-62679-4
PMID:: 32269246
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Pełny tekst

Flow of barotropic tidal currents over topographic features, such as continental slopes and submarine ridges, generates internal gravity waves at tidal periods known as internal tides. Amplitude of these waves are generally large near the generation regions. Analysis of Sea Surface Height (SSH) data, derived from satellite altimeter revealed the amplification of internal tides in the semidiurnal period in the north-central Bay of Bengal (BoB) (around 89[Formula: see text]E, 16[Formula: see text]N), which is about 450 km away from their generation sites. SSH signals found in the north-central BoB ([Formula: see text]3 cm) were comparable to the maximum amplitudes (2.5 to 3.5 cm) observed near their potential generation sites in the BoB such as continental slopes in the head of the bay and Andaman-Nicobar (AN) Ridge. Simulations from a high-resolution regional ocean model also confirmed the presence of large internal tide amplitude in the north-central BoB. Our study revealed that convergence of internal tides, which were generated along the concave-shaped source (continental slopes in the head of the bay and the northern parts of AN Ridge), into its focal region caused their amplification in the north-central BoB. It was also found that internal tide energy dissipation rates in this focal region were about 10 times larger than those in other open ocean regions.

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