Manifestations of the Indian Ocean tsunami of 2004 in satellite nadir-viewing radar backscatter variations

Details Manifestations of the Indian Ocean tsunami of 2004 in satellite nadir-viewing radar backscatter variations Manifestations of the Indian Ocean tsunami of 2004 in satellite nadir-viewing radar backscatter variations

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3304607t&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 4, CiteID L04607

Physics

Geophysics

Oceanography: Physical: Surface Waves And Tides (1222), Oceanography: Physical: Tsunamis And Storm Surges, Nonlinear Geophysics: Nonlinear Waves, Shock Waves, Solitons (0689, 2487, 3280, 3285, 4275, 6934, 7851, 7852), Oceanography: Physical: Air/Sea Interactions (0312, 3339), Radio Science: Remote Sensing

Scientific paper

The paper reports on the first experimental evidence for space-observed manifestation of the open ocean tsunami in the microwave radar backscatter (in C- and Ku-bands electromagnetic wave lengths 6cm and 2 cm respectively). Significant (a few dB) variations of the radar cross section synchronous with the sea level anomaly were found in the geophysical data record of the altimetry satellite Jason-1 for the track which crossed the head wave of the catastrophic tsunami of 26 December 2004. The simultaneous analysis of the available complementary data provided by the satellite three-channel radiometer enabled us to exclude meteorological factors as possible causes of the observed signal modulation. A possible physical mechanism of modulation of short wind waves due to transformation of the thin boundary layer in the air by a tsunami wave is discussed. The results open new possibilities of monitoring tsunamis from space.

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