Manifestations of the Indian Ocean tsunami of 2004 in satellite nadir-viewing radar backscatter variations
This paper reports on the first experimental evidence for space-observed manifestations of the open ocean tsunami in the microwave radar backscatter (in the C and Ku bands; electromagnetic wavelengths of 6 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 that 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, for example by support to warning systems based on fixed moorings and coastal stations.
No Reference information available - sign in for access.
No Citation information available - sign in for access.
No Supplementary Data.
No Article Media
Document Type: Research Article
Affiliations: Institute of Applied Physics Russian Academy of Sciences, Nizhny Novgorod, Russia
Publication date: November 1, 2008