Sea-ice thickness retrieval in the Sea of Okhotsk using dual-polarization SAR data
Abstract:We investigated the feasibility of using multi-polarization synthetic aperture radar (SAR) data to estimate the thickness of undeformed first-year ice. Analysis of the radar signatures for the C- and L-bands showed that the correlation between the ice thickness and VV-to-HH backscattering ratio is larger than the correlation between the ice thicknesses and the backscattering coefficients. This is in part because the ice surface salinity and hence the surface reflection coefficient decreases as the ice thickens. The backscattering ratio had low sensitivity to the small-scale ice surface roughness for the C-band and is almost independent of roughness at L-band. Given that the ratio is most sensitive to ice surface dielectric constants, which depend on salinity, we developed an algorithm for retrieving the ice thickness that is based on the backscattering ratio and on the integral-equation-method (IEM) surface scattering model. Comparison of the observed and estimated ice thicknesses showed that the correlation was much better when the thicknesses were estimated using the backscattering ratio than when the backscattering coefficient was used directly. The algorithm also performed better than previous retrievals using an empirical technique.
Document Type: Research Article
Publication date: 2006-11-01
- The Annals of Glaciology is a peer-reviewed, thematic journal published 2 to 4 times a year by the International Glaciological Society (IGS). Publication frequency is determined and volume/issue numbers assigned by the IGS Council on a year-to-year basis and with a lead time of 3 to 4 years. The Annals of Glaciology is included in the ISI Science Citation Index from volume 50, number 50 onwards.
Themes can be on any aspect of the study of snow and ice. Individual members can make a suggestion for a theme for an Annals issue to the Secretary General, who will forward it to the IGS Publications Committee. The IGS Publication Committee will make a recommendation for an individual themed Annals issue, together with a potential Annals Chief Editor for that issue, to IGS Council. The IGS Council will make the decision whether to proceed, taking into account the spread of topics and the overall capacity for publication of pages in Annals.
Beginning in 2016, content will be available at https://www.cambridge.org/core/journals/annals-of-glaciology.
- Editorial Board
- Information for Authors
- Ingenta Connect is not responsible for the content or availability of external websites