Abstract
In this paper, we investigate the possibilities of ice thickness remote sensing on freshwater lakes based on Sentinel-1 observations. Fr. was selected as a test site. Kurungnakh Island, located in the Lena River delta, was selected as a test site, where 10 lakes with floating and grounded ice were selected. For the test lakes, the time series of backscatting coefficients measured by Sentinel-1 at horizontal-horizontal polarization (EW mode) and at an angle of 18-20 from September 2015 to June 2017 were analyzed. The average lakes ice thickness was estimated based on the Lebedev’s model and air temperature according to the European Center for Medium-Range Weather Forecasts (ECMWF ERA5). It is shown that, the dependence between backscattering coefficient and ice thickness (120-140 cm) can be described a linear function (with a standard deviation of 13.5-25.3 cm and a determination coefficient of 0.70-0.79). The preliminary studies shows that the Sentinel-1 radar data is promising for remote sensing of ice thickness on freshwater arctic lakes.
Highlights
The Sentinel-1 radar data is not used for remote sensing of the ice thickness on Arctic freshwater lakes
This paper investigates the possibilities of ice thickness remote sensing for a group of freshwater lakes located on the Kurungnakh Island (Lena River Delta) based on Sentinel-1 radar data
Note that a strong correlation and a small error between the air temperature calculated on the basis of ECMWF data and measured by the Stolb Island weather station [4], located several kilometers south east of Kurungnah Island, which allows to use of ECMWF data to estimate air temperatures in the Arctic regions, where weather station data are not available
Summary
The Sentinel-1 radar data is not used for remote sensing of the ice thickness on Arctic freshwater lakes. The the ice lake thickness is a sensitive indicator, reflected the state of the climate system, and an esential climatic variable, recommended by the World Meteorological Organization for global observation [1]. This paper investigates the possibilities of ice thickness remote sensing for a group of freshwater lakes located on the Kurungnakh Island (Lena River Delta) based on Sentinel-1 radar data (operats on a frequency of 5.4 GHz, wavelength is about 5.6 cm). The backscatter coefficient (RBC) over test lakes was measured by the Sentinel-1 satellite at HH-polarization (horizontalhorizontal) at an angle between 18-20 degrees from September 2015 to June 2017 in EW mode. Radar images were processed in Sentinel Application Platform (SNAP) according to the standard procedure: applying precise orbits, radiometric calibrate, thermal noise removal, speckle filtering (5x5 Lee filter), range Doppler terrain correction
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