ECV Requirements Wolfgang Wagner.

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Presentation transcript:

ECV Requirements Wolfgang Wagner

GCOS Requirements Table

https://www.wmo-sat.info/oscar/variables/view/149

Proposal for Revised GCOS Table DEFINITION NAME: Surface soil moisture DEFINITION: Surface soil moisture refers to the water content in the topmost soil layer (usually taken to be 0-5 cm) MEASURMENT UNIT: m3/m3 (volumetric soil moisture) UNCERTAINTY METRIC: Unbiased root mean square error UNIT OF UNCERTAINTY METRIC: m3/m3 STABILITY METRIC: Maximum drift over reference period UNIT OF STABILITY METRIC: m3/m3 per reference period REQUIREMENTS UNCERTAINTY STABILITY HORIZONTAL RESOLUTION VERTICAL RESOLUTION (may by NA) TEMPORAL SAMPLING TIMELINESS? METHODS Uncertainty propagation Direct comparison with area-averaged in situ soil moisture over densely instrumented networks All field require explanatory notes Account for different climate applications by three levels approach?

Terminology for 3-Level Approach OSCAR: threshold – breakthrough – goal EUMETSAT H-SAF: threshold – target - optimal On-line Validation Report for H111 Metop ASCAT DR2017 SSM time series 12.5 km sampling http://rs.geo.tuwien.ac.at/h-saf/H111/report.html