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- Title
C-Band Polarimetric Coherences and Ratios for Discriminating Sea Ice Roughness.
- Authors
Gupta, Mukesh; Scharien, Randall K.; Barber, David G.
- Abstract
The rapid decline of sea ice in the Arctic has resulted in a variable sea ice roughness that necessitates improved methods for efficient observation using high-resolution space borne radar. The utility of C-band polarimetric backscatter, coherences, and ratios as a discriminator of ice surface roughness is evaluated. An existing one-dimensional backscatter model has been modified to two dimensions (2D) by considering deviation in the orientation (i.e., the slopes) in azimuth and range direction of surface roughness simultaneously as an improvement in the model. It is shown theoretically that the circular coherence (ρRRLL) decreases exponentially with increasing surface roughness .The crosspolarized coherence (ρHHVH) is found to be less sensitive to surface roughness, whereas the copolarized coherence (ρVVHH) decreases at far-range incidence angles for all ice types. A complete validation of the adapted 2D model using direct measurements of surface roughness is suggested as an avenue for further research.
- Subjects
ARCTIC regions; SEA ice; SURFACE roughness; POLARIMETRY; COHERENCE (Optics); RADAR
- Publication
International Journal of Oceanography, 2013, p1
- ISSN
1687-9406
- Publication type
Article
- DOI
10.1155/2013/567182