Soil moisture in Tibet derived from satellite obsevations

Soil moisture in Tibet

derived from satellite obsevations

C. Simmer and R. Lindau University of Bonn

ANOVA of Soil Moisture measurements

Variance in mm² Number

of bins Error of the total

mean

Seeming external variance

Error of external

means

Internal

variance True external variance

Relative external variance

Annual Cycle 36 2 388 51 10343 338 3.16%

Interstation 48 2 9133 10 1558 9123 85.40%

Interannual 8 2 39 12 10654 26 0.25%

Total variance External variance Internal variance

= Variance between + Mean variance the means of the within the subsamples subsamples

Local longtime means

single cumulative

Climatolog. rain 58.6 58.6

Soil texture 0.5 69.0

Vegetation 37.7 72.8

Terrain slope 2.8 73.0

73% of the soil moisture variance is explained by four parameters :

Two-step Retrieval

Climatological mean derived from:

• Longterm precipitation

• Soil texture

• Vegetation density

• Terrain slope

Temporal anomalies from:

• Brightness temperatures at 10 GHz

• Anomalies of rain and air temperature

+

Application: DEKLIM

BALTIMOS within DEKLIM (Deutsches

Klimaforschungsprogramm):

Validation of a 10-years climate run of the regional model REMO using SMMR.

Example: Oder catchment

R. Lindau and C. Simmer: Derivation of a root zone soil moisture algorithm and its

application to validate model data. Nordic Hydrology, accepted for publ.

Application: AMSR

GEOLAND within GMES (Global Monitoring for Environment and Security):

Derivation of global soil moisture fields from AMSR

M. Leroy, R. Lacaze, R. Lindau, F. Oleson, L.

Pessanha, I. Piccard, A. Rosema, J-L.

Roujean, F. Rubel, W. Wagner, M. Weiss, 2004: Towards a European Service Center for Monitoring land surfaces at global and regional Scales: The GEOLAND/ CSP Project

International Archives of Photogrammetry and Remote Sensing, XXth ISPRS Congress, Istanbul, 35 (B4), 783-790.

Longterm meanTemporal anomaly

Mean Soil Moisture in Tibet

• The longtime mean field is

characterized by strong gradients

Three points on the above section show decreasing soil moisture towards NW with a minimum in August

Annual Cycle

Feb

Aug

May

Nov