First Results of Recovery of Short Wavelength Gravity Field Signals from CryoSat-2 Data

Lars Stenseng, Ole Baltazar Andersen

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A number of geophysical phenomena in the open ocean are still unresolved by conventional 1 Hz altimetry, but could be observed through the potential improvements offered by SAR, or Delay-Doppler (DD), altimetry. The DD altimeter offers the following benefits with respect to conventional satellite altimetry: Factor of 20 improvements in along track resolution. Along-track footprint length that does not vary with wave height (sea state). Improved precision in sea surface height measurements / sea surface slope measurements. These improvements are studied with respect to retrieval of short wavelength geophysical signal related to mainly bathymetric features. The combination of upward continuation from the sea bottom and smoothing the altimeter observations resulted in the best recovery of geophysical signal for simulated 5-Hz DD observations. The first validation of these theoretical modeling results with respect to resolution and noise are presented using various CryoSat-2 data and evaluation against conventional Radar altimeter data from older GM missions onboard ERS-1 is presented. A comparison of L2 products for LRM, SAR and SAR-in data are carried out with re-tracked L1 data for the same data types.
Original languageEnglish
Title of host publicationProceedings of Cryosat Validation Workshop 2011
PublisherEuropean Space Agency
Publication date2011
ISBN (Print)978-92-9092-254-4
Publication statusPublished - 2011
EventCryoSat Validation Workshop 2011 - Francati (Rome), Italy
Duration: 1 Feb 20113 Feb 2011


ConferenceCryoSat Validation Workshop 2011
CityFrancati (Rome)

Cite this

Stenseng, L., & Andersen, O. B. (2011). First Results of Recovery of Short Wavelength Gravity Field Signals from CryoSat-2 Data. In Proceedings of Cryosat Validation Workshop 2011 (Vol. CD). European Space Agency.