SMOS soil moisture validation: status at the Upper Danube cal/val site eight months after launch SMOS cal/val proposal: AO ID 3236 Johanna Dall‘Amico 1 , Alexander Löw 2 , Florian Schlenz 1 , Wolfram Mauser 1 1 University of Munich, Department of Geography, Munich, Germany 2 Max-Planck-Institute for Meteorology, KlimaCampus, Hamburg, Germany Funded by German Aerospace Center (50EE0731)
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FR1.L10.5: SMOS SOIL MOISTURE VALIDATION: STATUS AT THE UPPER DANUBE CAL/VAL SITE EIGHT MONTHS AFTER LAUNCH
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SMOS soil moisture validation: status at the UpperDanube cal/val site eight months after launch
SMOS cal/val proposal: AO ID 3236
Johanna Dall‘Amico1, Alexander Löw2, Florian Schlenz1, Wolfram Mauser1
1University of Munich, Department of Geography, Munich, Germany2Max-Planck-Institute for Meteorology, KlimaCampus, Hamburg, Germany
Funded by German Aerospace Center (50EE0731)
IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
Cal/val approach
The Upper Danube Catchment cal/val site
Overview campaigns and data
Preliminary SMOS data analysis
Conclusions and outlook
IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
Objectives
SMOS cal/val objectives
Validate SMOS products Soil moisture (L2)
Brightness temperatures (L1c)
... over a large area (entire Upper Danube)
a smaller, but well instrumented area (Vils)
... using Field measurements
Large scale land surface modelling
Ancillary remote sensing data
Approach
validation
Land surfaceModel (PROMET)
1km
SMOSL2 SM product
Soil moistureSoil moisture station
1
IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
2
IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
Approach
validation
Land surfacemodel PROMET
1km
SMOSL2 SM product
API
Soil moistureSoil moisture station
L2 Processor
SMOS„L1c Brightness temperature“
Radiative Transfer model
comparisonvalidation
Radiometer
L-MEB
12
3
Approach
validation
Land surfacemodel PROMET
1km
SMOSL2 SM product
API
Soil moistureSoil moisture station
L2 Processor
SMOS„L1c Brightness temperature“
Radiative Transfer model
comparisonvalidation
Radiometer
L-MEB
• Two airborne campaigns•Comparison with ancillary remote sensingdata: soil moisture product from ENVISAT ASAR (VISTA GmbH)
12
3
IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
Upper Danube Catchment Vils test site
Radiometer
Size: 77000 km²
IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
Instrumentation Vils test site
Soil moisture• Profile (5 probes per station:
2x5,10,25,40cm )
– TDR Probes (IMKO GmbH)
– ECHO probes (Decagon)
• Automatic data transmission
• Start: 2007 (one station since
2002)
Meteorological data• Precipitation
• Longwave radiation
• Temperature (2m)
• Wind speed
• Solar radiation
• Relative humidity
• Temperature @ 5,40 cm
50 km
1
IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
Land surface modelling
Meteorological data from a dense network of in situ stations (NRT availability; subset shown)
2
PROMET land surface model
IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
Model validation
PROMET model has been extensively validated and is still being validated regularly using in-situ data
ELBARA 2 radiometer
GrasslandRape
Meteorologicaldata
3
IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
ELBARA 2 radiometer
Data of ELBARA available through a web client
(full access to instrument ancillary data)
IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
Radiometer data comparison 2008
Two complementary radiometers during SMOS airborne campaignsprovide added value:
- HUT-2D: imaging system, good spatial resolution
- EMIRAD: better radiometric calibration
-60
-50
-40
-30
-20
-10
0
10
20
30
08/04/2008 15/04/2008
firs
t s
toke
s p
ara
me
ter
[K]
flight days during rehearsal campaign 2008
EMIRAD minus HUT-2D after temperature correction
Lochheim
Engersdorf SouthEngersdorf NorthSteinbeissen SouthSteinbeissen North
IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
SMOS cal/val campaign 2010
Five flights: 17, 22, 25 May, 12, 17 June 2010
Most overflights covered 10 ground stations and the ELBARA radiometer (white) and 5 focus areas (red)
Intensified ground campaign compared to 2008
Basic objective
• Representative coverage of
parts of one SMOS pixel
SMOS cal/val campaign 2010
First data SMOS campaign 2010
EMIRAD data on lake Chiemsee HUT-2D data example (black areas: forest)
IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
SMOS cal/val campaign 2010
Vils test site
TIR brightness temperatures (raw data)
IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
Field measurements 2010
Soil moisture 60 points covering whole focus area (spacing ~ 500m) 90 points covering smaller sub-area (spacing ~ 100 m) =>~ 3000 SM measurements per day in the whole Vils
Soil temperature
Vegetation parameters Height, phenology, biomass
Land cover mapping
Meteo data Neusling (014)
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tem
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°C]
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mm
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precipitation
air temperature
Flights
Conditions during campaign
Different soil moisture conditions between saturated and medium dry Vegetation growth phase optical depth Air temperature between
10 and 30°C
IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu
Dynamics of ground measurements
IEEE International Symposium on Geoscience and Remote Sensing - IGARSS 2010 in Honolulu