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Modeling Envisat RA-2 waveforms in the coastal zone: case-study of calm water contamination

By Jesus Gómez-Enri, Stefano Vignudelli, Graham D. Quartly, Christine P. Gommenginger, Paolo Cipollini, Peter G. Challenor and Jérôme Benveniste

Abstract

Radar altimeters have so far had limited use in the coastal zone, the area with most societal impact. This is due to both lack of, or insufficient accuracy in the necessary corrections, and more complicated altimeter signals. This paper examines waveform data from the Envisat RA-2 as it passes regularly over Pianosa (a 10 km2 island in the NW Mediterranean). Forty-six repeat passes were analysed, with most showing a reduction in signal upon passing over the island, with weak early returns corresponding to the reflections from land. Intriguingly one third of cases showed an anomalously bright hyperbolic feature. This feature may be due to extremely calm waters in the Golfo della Botte (northern side of the island), but the cause of its intermittency is not clear. The modelling of waveforms in such a complex land/sea environment demonstrates the potential for sea surface height retrievals much closer to the coast than is achieved by routine processing. The long-term development of altimetric records in the coastal zone will not only improve the calibration of altimetric data with coastal tide gauges, but also greatly enhance the study of storm surges and other coastal phenomena

Topics: GC, GE
Year: 2010
OAI identifier: oai:eprints.soton.ac.uk:69721
Provided by: e-Prints Soton

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Citations

  1. (2006). A coastal retracking system for satellite radar altimeter waveforms: Application to ERS-2 around doi
  2. (2006). A satellite altimeter model for ocean slick detection,” doi
  3. (1995). A two-dimensional tidal model for the Mediterranean Sea,” doi
  4. (1998). Determination of oceanic rain rate and rain cell structure from altimeter waveform data. Part I: doi
  5. (1998). Determination of rain cell characteristics from the analysis of TOPEX altimeter echo waveforms,” doi
  6. (1990). Effect of islands in doi
  7. (2008). Exploiting the potential of an improved multi-mission altimetric data set over the coastal ocean,” doi
  8. Handbook of Radar Scattering Statistics for Terrain.
  9. (2005). Improved satellite altimetry in coastal systems:
  10. (2007). Measuring global ocean wave skewness by retracking RA-2 doi
  11. (1986). On the joint distribution of surface elevation and slopes for a nonlinear random sea, with an application to radar altimetry,” doi
  12. (1987). Radar scattering and equilibrium ranges in wind-generated waves with application to scatterometry,” doi
  13. (2007). Signature of lighthouses, ships, and small islands in altimeter waveforms,” doi
  14. (1977). The average impulse response of a rough surface and its applications,” doi
  15. (1996). The effects of rain on Topex radar altimeter data,” doi
  16. (1989). The extraction of geophysical parameters from radar altimeter return from a nonlinear sea surface,”
  17. (1993). Using transponders with ERS-1 and TOPEX altimeters to measure orbit altitude to doi

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