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Semidiurnal M 2 internal tides in the Indo‐Australian Basin
Author(s) -
Katsumata K.,
Wijffels S.
Publication year - 2006
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2006gl026861
Subject(s) - bathythermograph , internal tide , geology , throughflow , structural basin , oceanography , archipelago , abyssal zone , internal wave , geomorphology , soil science
Clear signals of internal tide propagation are found at the semidiurnal M 2 frequency in the eastern South Indian Ocean over the abyssal plain of the Indonesian Australian Basin. We find a spatially and temporally coherent internal tide with phase propagation estimated from satellite altimetry suggesting generation along the Indonesian Archipelago and the Australian North West Shelf east of 115°E. A sinusoidal fit is used to estimate internal tide phase and amplitude along vertical cross sections from expendable bathythermograph (XBT) data along volunteer merchant shipping lines. It is likely tidal energy in the middle of the Indonesian Australian Basin is from both northern and southern source regions, and may sustain a second region of enhanced mixing for the Indonesian Throughflow.