Publication Date:
2019-07-13
Description:
Spatial and temporal backscatter intensity (sigma(sup o)) variations from ice growing on shallow lakes during winter 1991-92 near Barrow, NW Alaska, have been quantified for the first time using ERS-I C-band SAR data acquired at the Alaska SAR Facility. A field and laboratory validation program, including measurements of the thickness and structure-stratigraphy of the ice, indicates that sigma(sup o) values are strongly dependent on whether the ice freezes to the lake bottom, or remains afloat. Backscatter intensity decreases significantly when the ice grounds on the bottom. Strong backscatter from floating ice is attributed to a specular ice-water interface and vertically oriented tubular bubbles. During the spring thaw, backscatter undergoes a reversal; sigma(sup o) values from ice that was grounded increase, while sigma(sup o) values from ice that was afloat decrease. This phenomenon has not previously been reported.
Keywords:
ENVIRONMENT POLLUTION
Type:
NASA-CR-199629
,
NIPS-95-05488
,
NAS 1.26:199629
,
IEEE-93CH3294-6
,
1993 International Geoscience and Remote Sensing Symposium (IGARSS 1993). Better Understanding of Earth Environment, Volume 4; Aug 18, 1993 - Aug 21, 1993; Tokyo; Japan
Format:
application/pdf
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