Arid
DOI10.1109/TGRS.2004.840646
Microwave backscatter modeling of Erg surfaces in the Sahara desert
Stephen, H; Long, DG
通讯作者Stephen, H
来源期刊IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
ISSN0196-2892
EISSN1558-0644
出版年2005
卷号43期号:2页码:238-247
英文摘要

The Sahara desert includes large expanses of sand dunes called ergs. These dunes are formed and constantly reshaped by prevailing winds. Previous study shows that Saharan ergs exhibit significant radar backscatter (sigmadegrees) modulation with azimuth angle (phi). We use alphadegrees measurements observed at various incidence angles and phi from the NASA Scatterometer (NSCAT), the SeaWinds scatterometer, the ERS scatterometer (ESCAT), and the Tropical Rainfall Measuring Mission’s Precipitation Radar to model the sigmadegrees response from sand dunes. Observations reveal a characteristic relationship between the backscatter modulation and the dune type, i.e., the number and orientation of the dune slopes. Sand dunes are modeled as a composite of tilted rough facets, which are characterized by a probability distribution of tilt with a mean value, and small ripples on the facet surface. The small ripples are modeled as cosinusoidal surface waves that contribute to the return signal at Bragg angles only. Longitudinal and transverse dunes are modeled with rough facets having Gaussian tilt distributions. The model results in a sigmadegrees response similar to NSCAT and ESCAT observations over areas of known dune types in the Sahara. The response is high at look angles equal to the mean tilts of the rough facets and is lower elsewhere. This analysis provides a unique insight into scattering by large-scale sand bedforms.


英文关键词backscatter Erg ERS Scatterometer (ESCAT) NASA Scatterometer (NSCAT) sand dune sand sheet Sea Winds scatterometer (QSCAT) Tropical Rainfall Measuring Mission Precipitation Radar (TRMM-PR)
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000226502100004
WOS关键词SCATTEROMETER DATA ; SEA-ICE ; SATELLITE
WOS类目Geochemistry & Geophysics ; Engineering, Electrical & Electronic ; Remote Sensing ; Imaging Science & Photographic Technology
WOS研究方向Geochemistry & Geophysics ; Engineering ; Remote Sensing ; Imaging Science & Photographic Technology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/149256
作者单位(1)Brigham Young Univ, Ctr Earth Remote Sensing, Provo, UT 84602 USA
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Stephen, H,Long, DG. Microwave backscatter modeling of Erg surfaces in the Sahara desert[J],2005,43(2):238-247.
APA Stephen, H,&Long, DG.(2005).Microwave backscatter modeling of Erg surfaces in the Sahara desert.IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING,43(2),238-247.
MLA Stephen, H,et al."Microwave backscatter modeling of Erg surfaces in the Sahara desert".IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING 43.2(2005):238-247.
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