Jackson072311.ppt

SMOS Soil Moisture Validation With U.S. In Situ Networks T. J. Jackson, R. Bindlish, M. Cosh, and T. Zhao USDA ARS Hydrology and Remote Sensing Lab Beltsville. MD 20705 USA [email_address] July 25, 2011

Overview ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

USDA ARS Watershed Networks ,[object Object],[object Object],[object Object],[object Object],AZ-WG OK-LW GA-LR ID-RC

Role of AMSR-E in Validating SMOS Soil Moisture Products ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

SMOS Validation Results ,[object Object],[object Object],[object Object],[object Object],[object Object]

SMOS Validation (Jan. 2010-May 2011)

SMOS Algorithm Performance (Jan. 2010-May 2011) ,[object Object],[object Object],[object Object],Watershed Product SMOS Asc. 0600 SMOS Dsc. 1800 RMSE Bias R N RMSE Bias R N Walnut Gulch, AZ SMOS 0.033 -0.003 0.826 184 0.030 0.002 0.758 222 Little Washita, OK SMOS 0.041 -0.001 0.780 188 0.043 -0.007 0.792 194 Little River, GA SMOS 0.053 0.030 0.716 205 0.082 0.061 0.577 212 Reynolds Creek, ID SMOS 0.039 -0.023 0.152 51 0.045 -0.016 0.136 42 RMSE (Root mean square error), and Bias are in m 3 /m 3 . R=Linear correlation coefficient, N=Number of samples

SMOS Validation: AMSR-E Benchmark SMOS exhibited overestimation that we did not encounter with AMSR-E….why?

SMOS and AMSR-E SCA Algorithm Performance (Jan. 2010-May 2011). ,[object Object],Watershed Product SMOS Asc. 0600 AMSR-E Dsc 0130 SMOS Dsc. 1800 AMSR-E Asc. 1330 RMSE Bias R N RMSE Bias R N Walnut Gulch, AZ SMOS 0.033 -0.003 0.826 184 0.030 0.002 0.758 222 AMSR-E 0.026 -0.016 0.505 292 0.032 -0.022 0.479 350 Little Washita, OK SMOS 0.041 -0.001 0.780 188 0.043 -0.007 0.792 194 AMSR-E 0.057 -0.033 0.530 321 0.058 -0.036 0.650 366 Little River, GA SMOS 0.053 0.030 0.716 205 0.082 0.061 0.577 212 AMSR-E 0.051 0.036 0.501 317 0.037 0.020 0.717 346 Reynolds Creek, ID SMOS 0.039 -0.023 0.152 51 0.045 -0.016 0.136 42 AMSR-E 0.041 -0.035 0.172 74 0.044 -0.039 0.045 76 RMSE (Root mean square error), and Bias are in m 3 /m 3 . R=Linear correlation coefficient, N=Number of samples

General Comments on SMOS Soil Moisture Retrievals ,[object Object],[object Object],[object Object],[object Object]

A Closer Look at WG ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],WG Temporal Plots of SMOS and In Situ Soil Moisture and Antecedent Precipitation (Rain Gage) (Asc.)

Possible Impacts of Precipitation ,[object Object],[object Object],[object Object],[object Object],[object Object]

Apply a Precipitation Flag? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],Effect of Precipitation Flagging on SMOS Soil Moisture Algorithm Performance Watershed Flag SMOS Asc. 0600 SMOS Des. 1800 RMSE Bias R N RMSE Bias R N Walnut Gulch, AZ None 0.033 -0.003 0.826 184 0.030 0.002 0.758 222 ECMWF 0.029 -0.007 0.749 170 0.023 -0.003 0.744 199 Active Rain 0.030 -0.006 0.834 177 0.022 -0.005 0.726 180 6-Hour Ant. 0.022 -0.011 0.714 162 0.021 -0.005 0.728 169 RMSE (Root mean square error), and Bias are in m 3 /m 3 . R=Linear correlation coefficient, N=Number of samples. 6-Hour Ant.=6-Hour Antecedent

Vegetation Parameter Tau ,[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],Walnut Gulch Watershed

[object Object],[object Object],[object Object],Little Washita Watershed

[object Object],[object Object],[object Object],Little River Watershed

[object Object],Comparison of Tau Retrieved by SMOS (Asc.) and Estimated from MODIS NDVI (Jan. 2010-May 2011) Watershed SMOS Tau MODIS estimated Tau Walnut Gulch, AZ 0.19 0.06 Little Washita, OK 0.21 0.11 Little River, GA 0.30 0.14 Reynolds Creek, ID 0.22 0.08

Assessment of the SMOS Tau ,[object Object],[object Object],[object Object]

Summary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

SMOS FOV ,[object Object],[object Object],[object Object],[object Object]

Jackson072311.ppt

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