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Detection of Soil Freeze/Thaw Processes using SMOS and ELBARA-II Finnish Meteorological Institute (FMI) K. Rautiainen, J. Lemmetyinen, J. Pulliainen, A.

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Presentation on theme: "Detection of Soil Freeze/Thaw Processes using SMOS and ELBARA-II Finnish Meteorological Institute (FMI) K. Rautiainen, J. Lemmetyinen, J. Pulliainen, A."— Presentation transcript:

1 Detection of Soil Freeze/Thaw Processes using SMOS and ELBARA-II Finnish Meteorological Institute (FMI) K. Rautiainen, J. Lemmetyinen, J. Pulliainen, A. Kontu, J. Ikonen, J. Vehviläinen

2 SMOS ELBARA-II

3 ELBARA-II measurements vs frost tube observations Inc. angle: 50  Snow Frost

4 Two winter time-series: ELBARA-II and frost/snow Winter 2009-10 Winter 2010-11 Snow Frost

5 Two winter time-series: ELBARA-II and frost/snow Snow Frost Freezing period 2009 Freezing period 2010

6 Two winter time-series: ELBARA-II and frost/snow Snow Frost Early spring 2010 Early spring 2011

7 Two winter time-series: ELBARA-II and frost/snow Snow Frost Snow melt-off 2010 Snow melt-off 2011

8 Soil freezing and ELBARA-II Frost depth from frost tube observations (blue circles) Triangles: soil freezing state defined using ELBARA-II data L-band signal saturates as the soil frost depth reaches ~ 50 cm

9 Detecting frost using SMOS data From ELBARA-II to SMOS data SMOS incidence angles 50-60 degrees used L1C data – H,V polarizations Test area: Finland Over 2000 smos grid pixels within the area Each pixel checked with the Frost algorithm to monitor the soil freezing state  Here used soil frost depths of 10, 20 and 30 cm and no frost  Soil frost maps over Finland

10 Soil Frost map vs ECMWF surface temperature Frost information derived from SMOS data Surface (2m) temperature (20 day moving average) interpolated from ECMWF 2m temperature observations Frost map Temperature map

11 Soil Frost map vs ECMWF surface temperature Frost map Temperature map

12 Soil Frost map vs ECMWF surface temperature Frost map Temperature map

13 Soil Frost map vs ECMWF surface temperature Frost map Temperature map

14 Soil Frost map vs ECMWF surface temperature Frost map Temperature map

15 Soil Frost map vs ECMWF surface temperature Frost map Temperature map

16 Soil Frost map vs ECMWF surface temperature Frost map Temperature map

17 Soil Frost map vs ECMWF surface temperature Frost map Temperature map

18 Soil Frost map vs ECMWF surface temperature Frost map Temperature map

19 Soil Frost map vs ECMWF surface temperature Frost map Temperature map

20 Soil Frost map vs ECMWF surface temperature Frost map Temperature map

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