Articles | Volume 17, issue 9
Brief communication
25 Sep 2023
Brief communication |  | 25 Sep 2023

Brief communication: Identification of tundra topsoil frozen/thawed state from SMAP and GCOM-W1 radiometer measurements using the spectral gradient method

Konstantin Muzalevskiy, Zdenek Ruzicka, Alexandre Roy, Michael Loranty, and Alexander Vasiliev

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Cited articles

Chang, A. T. C. and Shiue, J. C.: A comparative study of microwave radiometer observations over snowfields with radiative transfer model calculations, Remote Sens. Environ., 10, 215–229,, 1980. 
Chaubell, J., Chan, S., Dunbar, R. S., Peng, J., and Yueh, S.: SMAP Enhanced L1C Radiometer Half-Orbit 9 km EASE-Grid Brightness Temperatures, Version 3, Boulder, Colorado, USA NASA National Snow and Ice Data Center [data set],, 2020. 
Derksen, C., Xu, X., Dunbar, R. S., Colliander, A., Kim, Y., Kimball, J. S., Black, T. A., Euskirchen, E., Langlois, A., Loranty, M.M., Marsh, P., Rautiainen, K., Roy, A., Royer, A., and Stephens, J.: Retrieving Landscape Freeze/Thaw State from Soil Moisture Active Passive (SMAP) Radar and Radiometer Measurements, Remote Sens. Environ., 194, 48–62,, 2017. 
De Roo, R. D. and Ulaby, F. T.: Bistatic specular scattering from rough dielectric surfaces, IEEE T. Antenn. Propag., 42, 220–231,, 1994. 
Dunbar, S., Xu, X., Colliander, A., Derksen, C., Kimball, J., and Kim, Y.: Algorithm Theoretical Basis Document (ATBD), SMAP Level 3 Radiometer Freeze/Thaw Data Products, JPL CIT: JPL D-56288, 33, (last access: 15 September 2023), 2016. 
Short summary
A new all-weather method for determining the frozen/thawed (FT) state of soils in the Arctic region based on satellite data was proposed. The method is based on multifrequency measurement of brightness temperatures by the SMAP and GCOM-W1/AMSR2 satellites. The created method was tested at sites in Canada, Finland, Russia, and the USA, based on climatic weather station data. The proposed method identifies the FT state of Arctic soils with better accuracy than existing methods.