Comptes Rendus
no. 9
Probing matter with electromagnetic waves / Sonder la matière par les ondes électromagnétiques
Scattering properties of a stratified air/snow/sea ice medium. Small slope approximation
[Diffusion par un milieu stratifié air/neige/mer glacée. Modèle des faibles pentes]
Richard Dusséaux1  ; Saddek Afifi2  ; Monique Dechambre1
1 Université de Versailles Saint-Quentin-en-Yvelines, LATMOS/IPSL, 10–12, av. de l'Europe, 78140 Vélizy, France
2 Département d'Électronique, Université Badji Mokhtar Annaba, P.O. Box 12, 23000 Annaba, Algeria
Comptes Rendus. Physique, Volume 17 (2016) no. 9, pp. 995-1002.

L'épaisseur des glaces de mer est un paramètre clé pour l'étude du fonctionnement de la zone arctique. Cette grandeur est obtenue à l'aide de mesures faites depuis un altimètre radar spatial du bord franc de la banquise. Mais ceci suppose que non seulement la charge de neige qui recouvre la glace de mer, mais aussi la distance de pénétration de l'onde dans le milieu soient connues, ce qui n'est en général pas le cas. Dans ce contexte, nous étudions à l'aide de la méthode des faibles pentes la signature radar en bande Ku (f=13 GHz, λ=2.31 cm dans l'air) d'une mer gelée enneigée sous la forme d'une configuration air/neige/glace/mer. La couche de neige est inhomogène et représentée comme un empilement de plusieurs couches ayant des permittivités relatives différentes. Nous mettons en évidence l'influence combinée sur la signature radar du facteur d'isotropie de l'interface air/neige et des facteurs de corrélation entre les différentes interfaces.

The sea-ice thickness, a key parameter in Arctic studies, is derived from radar altimeter height measurements of the freeboard, taking into account not only snow load, but also the penetration depth of the electromagnetic waves inside the snow—this is the not generally the case. Within the framework of the small slope approximation method, we study in Ku-band (f=13 GHz, λ=2.31 cm in the air) the electromagnetic signature of an air/snow/sea ice rough layered medium. The snow is inhomogeneous and is represented as a stack of several layers with different relative permittivities. We show that the electromagnetic response is very sensitive to the isotropy factor of the air/snow interface and to the cross-correlation parameters of interfaces.

Publié le :
DOI : 10.1016/j.crhy.2016.07.017
Keywords: Small slope approximation, Layered medium, Scattered intensity
Mot clés : Modèle des faibles pentes, Milieu multicouches, Intensité diffractée
Richard Dusséaux 1 ; Saddek Afifi 2 ; Monique Dechambre 1

1 Université de Versailles Saint-Quentin-en-Yvelines, LATMOS/IPSL, 10–12, av. de l'Europe, 78140 Vélizy, France
2 Département d'Électronique, Université Badji Mokhtar Annaba, P.O. Box 12, 23000 Annaba, Algeria 
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     pages = {995--1002},
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     number = {9},
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Richard Dusséaux; Saddek Afifi; Monique Dechambre. Scattering properties of a stratified air/snow/sea ice medium. Small slope approximation. Comptes Rendus. Physique, Volume 17 (2016) no. 9, pp. 995-1002. doi : 10.1016/j.crhy.2016.07.017. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2016.07.017/

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