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 transcript:

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

SMOS ELBARA-II

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

Two winter time-series: ELBARA-II and frost/snow Winter Winter Snow Frost

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

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

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

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

Detecting frost using SMOS data From ELBARA-II to SMOS data SMOS incidence angles 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

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

Soil Frost map vs ECMWF surface temperature Frost map Temperature map

Soil Frost map vs ECMWF surface temperature Frost map Temperature map

Soil Frost map vs ECMWF surface temperature Frost map Temperature map

Soil Frost map vs ECMWF surface temperature Frost map Temperature map

Soil Frost map vs ECMWF surface temperature Frost map Temperature map

Soil Frost map vs ECMWF surface temperature Frost map Temperature map

Soil Frost map vs ECMWF surface temperature Frost map Temperature map

Soil Frost map vs ECMWF surface temperature Frost map Temperature map

Soil Frost map vs ECMWF surface temperature Frost map Temperature map

Soil Frost map vs ECMWF surface temperature Frost map Temperature map

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