SMOS-BEC – Barcelona (Spain) Assessment of impact of new ECMWF cycle 38r2 BEC team SMOS Barcelona Expert Centre Pg. Marítim de la Barceloneta 37-49, Barcelona.

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Presentation transcript:

SMOS-BEC – Barcelona (Spain) Assessment of impact of new ECMWF cycle 38r2 BEC team SMOS Barcelona Expert Centre Pg. Marítim de la Barceloneta 37-49, Barcelona SPAIN URL:

SMOS-BEC 2 objectives Analysis on the impact of using old version of ECMWF products vs new version (cycle 38r2 ) ARGANS processed 100 orbits with new ECMWF. Comparison has been performed with new data vs DPGS data from to Compute differences at SSS L2 at ASC/DES. Compute errors of SMOS L2 versus ARGO floats.

SMOS-BEC Meteorological contents of the new cycle: Number of vertical levels increased from 91 to 137 Revised background error variances at 137 levels based on IFS cycle 38r1. Revised EDA calibration and filtering for 137 levels. Model error cycling in stratosphere switched off. Modification of surface drag. Modified test parcel entrainment in boundary layer and shallow convection. Adjustment of non-orographic gravity wave drag to be consistent with System-4. Oxygen absorption correction. Revision of Sea-ice/SST quality control over the Caspian Sea. Cycles comparison from ECMWF webpage

SMOS-BEC Impact: Meteorological impact of the new cycle: IFS cycle 38r2 increases the vertical resolution of the model throughout the troposphere and stratosphere. It enables a better representation of physical processes, clouds, inversions and vertically propagating gravity waves, for example. Weather parameters: For precipitation and temperature the overall conclusion is a slight improvement in the extra- tropics and a slight degradation in the tropics. The scores for 10m wind show neutral to slightly positive impact both in extra-tropics and tropics. There is an overall slight reduction of wind speed, most notable in Europe at 12 UTC. Cycles comparison from ECMWF webpage

SMOS-BEC SSS3 NEW_ECMWF – OLD_ECMWF Max dif : 23 psu !!! Large differences in the Antarctic current region -> maybe due to WS 1

SMOS-BEC SSS3 NEW_ECMWF – OLD_ECMWF 1

SMOS-BEC Comparison vs ARGO floats NEW ECMWF ASCENDING SMOS- ARGO OLD ECMWF ASCENDING SMOS- ARGO +/- 5 days +/- 50 km

SMOS-BEC NEW ECMWF ASCENDING SMOS- ARGO OLD ECMWF ASCENDING SMOS- ARGO Comparison vs ARGO floats +/- 5 days +/- 50 km

SMOS-BEC NEW ECMWF ASCENDING SMOS- ARGO OLD ECMWF ASCENDING SMOS- ARGO Comparison vs ARGO floatsV LATITUDE +/- 5 days +/- 50 km

SMOS-BEC Comparison vs ARGO floats NEW ECMWF ASCENDING SMOS- ARGO OLD ECMWF ASCENDING SMOS- ARGO LATITUDE +/- 5 days +/- 50 km

SMOS-BEC Comparison vs ARGO floats - region [-40S, -60S] region [-40S, -60S]

SMOS-BEC CONCLUSIONS Most evident effects are observed near the poles, in particular near Antarctica. Comparisons between SSS L2 vs ARGO show a very small improvement with the new ECWMF cycle. Mean (SSS-ARGO) ~ 0.01 Std (SSS-ARGO) ~ Higher improvements are observed bellow -40ºS (Std (SSS-ARGO) ~ 0.01). With 3 days of data it is not recommended to perform analysis with L3 maps.