Validation of ASCAT measurements over cold target regions

Validation of ASCAT measurements over cold target regions.

The purpose of this study is to evaluate the suitability of cold target regions (Antarctic ice sheet) for a cross-validation of scatterometer data from different instruments and assess the long term stability of instrument calibration.

Study Meetings



The objective of this short study is the preparation of the validation of the upcoming ASCAT instrument on Metop-C, by developing a suitable cross-validation method to evaluate the radiometric properties (stability, relative accuracy) of the ASCAT instruments on Metop-A and B


A statistical analysis of the ASCAT time series from Metop-A and -B over a well-selected area in Antarctica will be performed using a 3-year period of data. ASCAT-A/B data variations will be explored with season, meteorological conditions and surface variations, with the help of auxiliary data from the global Numerical Weather Prediction model ARPEGE. Based on the results, a stable target region will be selected and the ASCAT backscatter signal will be evaluated with respect to the meteorological and surface conditions. The multi-year database of CNRM (Centre National de Recherches Météorologiques) surface emissivities will be used for preliminary statistical and quantitative analysis of microwave emissivities versus ASCAT backscatter over our target region in Antarctica to examine the backscatter variability with season and surface type. The potential of combining active and passive microwave data to explore new perspectives for inter-calibration of instruments will be investigated. The feasibility of using stable natural targets will be evaluated, aiming to propose a methodology to combine relevant measurements from passive and active instruments in order to perform cross-calibration of present and future microwave instruments.


Phase Details
Kick-Off 27/07/2018
Duration 6 months
Status Ongoing
WP100 First review of literature
WP210 Preparation of collocated passive microwave surface emissivity time series
WP220 Comparison with passive microwave surface emissivities and updated review
WP300 Passive/Active synergy applied to instrument inter-calibration
WP400 Synthesis of results

Study Meetings

Phase Date and location
Kick-Off 27/07/2018, Telecon
PM1 27/09/2018, Telecon
PM2 TBD, Météo-France
PM3 03/12/2018, Telecon
Final presentation TBD, EUMETSAT


EUMETSAT Project Manager
Dr Stefanie Linow
Remote Sensing Scientist - Scatterometry
Remote Sensing and Products Division
Dr Jean-François Mahfouf
CNRM – CNRS/Météo-France
Centre National de Recherches Météorologiques - UMR 3589
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