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NASA Technical Reports Server (NTRS) 19960003125: Backscatter from ... |
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by NASA Technical Reports Server (NTRS) |
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The timing of freeze-up and break-up of Arctic lake ice |
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is a potentially useful environmental indicator that |
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could be monitored using SAR. In order to do this, it is |
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important to understand how the properties and structure |
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of the ice during its growth and decay affect radar |
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backscatter and thus lake ice SAR signatures. The |
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availability of radiometrically and geometrically |
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calibrated digital SAR data time series from the Alaska |
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SAR Facility has made it possible for the first time to |
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quantify lake ice backscatter intensity (sigma(sup o)) |
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variations. This has been done for ice growing on shallow |
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tundra lakes near Barrow, NW Alaska, from initial growth |
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in September 1991 until thawing and decay in June 1992. |
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Field and laboratory observations and measurements of the |
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lake ice were made in late April 1992. The field |
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investigations of the coastal lakes near Barrow confirmed |
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previous findings that, (1) ice frozen to the lake bottom |
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had a dark signature in SAR images, indicating weak |
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backscatter, while, (2) ice that was floating had a |
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bright signature, indicating strong backscatter. At all |
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sites, regardless of whether the ice was grounded or |
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floating, there was a layer of clear, inclusion-free ice |
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overlaying a layer of ice with dense concentrations of |
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vertically oriented tubular bubbles. At some sites, there |
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was a third layer of porous, snow-ice overlaying the |
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clear ice. |
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Date Published: 2016-10-03 15:36:39 |
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Identifier: NASA_NTRS_Archive_19960003125 |
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Item Size: 2979147 |
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Language: english |
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Media Type: texts |
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