High-resolution satellite soil moisture evaluation and ... ·...

High-resolutionsatellitesoilmoistureevaluationandestimation

JianPeng,EwanPinnington,EmmaRobinson,JonathanEvans,TristanQuaife,PhilHarris,EleanorBlyth,SimonDadson

Email:jian.peng@ouce.ox.ac.uk

Jian Peng, Ewan Pinnington, Emma Robinson, Jonathan Evans, Tristan Quaife, Phil Harris, Eleanor Blyth, Simon Dadson, High-resolution soil moisture estimation and evaluation from Earth observation in UK mainland, In preparation.

Outline

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•  Several high spatial resolution satellite soil moistureproductsatseveralkilometersareavailable

•  Evaluation of these methods/products is essential andhighlyrequiredbyresearchcommunities

•  Objectives•  Inter-comparehigh-resolutionsatellitesoilmoistureproductsusing

triplecollocationapproachandCOSMOS-UKmeasurements

•  Investigatethepotentialofmergingexistingsoilmoistureproductstoobtainthebesthigh-resolutionsoilmoistureestimate

Study area and data

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COSMOS%UK((Cosmic(ray,soil,moisture,monitoring,network),

(

Soilmoistureproduct Temporalresolution

Gridsize Originalband/frequency

SMOS Daily 1km L-band(1.4GHz)

SMAP Daily 9km L-band(1.41GHz)

Sentinel-1 Daily 1km C-band(5.405GHz)

Sentinel-1/SMAPcombined Daily 3km /

JULES-CHESS Daily 1km /

38 sites

Validation against COSMOS measurements

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ErrorstatisticsforeachstationDirectcomparison

(a)

(b)

Validation against COSMOS measurements

5

ErrorstatisticsforeachstationAnomalycomparison

(a)

(b)

Validation against COSMOS measurements

6

Comparisonbasedoncollocatedsamples

(a)

(b)

(a)

(b)

Direct comparison

Anomaly comparison

Triple collocation analysis

7

(a)

(b)

Truth?

In-situ

Model

Satellite

Triple collocation merging scheme

8

Spatial pattern of merged soil moisture

9

2016.03

Evaluation of merged soil moisture product

10

Evaluation of merged soil moisture product

11

(a)

(b)

(c)

(d)

(a)

(b)

(c)

(d)

Direct comparison

Anomaly comparison

Conclusion

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•  SMAP soil moisture product outperforms other existingsatelliteproductscomparedtoCOSMOS-UKmeasurements

•  Merged soil moisture integrates the benefit of satelliteobservations and JULES-CHESS output, based on TC errorestimationandleastsquaremergingscheme

•  9kmand1kmintegratedandgaplesssoilmoistureproductwillbegeneratedovertheUKmainland