SSHCCI-product assessment

The RCSM4 coupled regional model

NEMOMED8Regional version of NEMO-V2with filtered free surface (Madec, 2008)Horizontal resolution 1/8°x1/8°cos(Φ), 43

vertical levelsAn Atlantic buffer zone (3D T-S and SSH

toward COMBINE reanalysis)

ALADIN-Climat V5Regional climate model

(Colin et al., 2010)

Horizontal resolution 50km, 31 vertical levels

Spectral nudging (toward ERA-Interim reanalysis)

TRIPRiver routeing model (Oki and Sud, 1998; Decharme et al., 2010)

0.5° resolution of the river network

OASIS coupler (Valcke, 2006)

Time series of mean sea level anomalies averaged over the Mediterranean Sea for the period 1980-2012 (m)

Seasonal cycle of mean sea level anomaly over the Mediterranean Sea over the period 1993-2010 (cm)

Trends of sea surface height anomalies over the period 1993-2010 (mm/yr)

Sea Surface Height

The confrontation with the model lets some open questions concerning the way to facilitate the comparison between the models and the observations. There is the need for an “SSH observation simulator”, either at the global or at the regional scale.

CCI SSH product is suitable for regional climate studies over the Mediterranean basin, even at a scale of a few tens of kilometres.

There is the opportunity to evaluate consistency with other CCI products over the Mediterranean region taking advantage of the development of regional climate system models, of the MedCORDEX model intercomparison project and of the HyMEX experiment.

O3CCI-products assessment

Histograms of total columns ozone cumulated in October 2008 (Dobson Units)

DU

%

Vertical profiles of zonal mean differences of ozone mixing ratios between NIWA and MERGED_LP (ppmv)

Histograms of total columns ozone cumulated in October 2008 (Dobson Units)

%

DU

Annual cycle over the year 2008 of monthly mean ozone mixing ratio averaged over 90S – 60S (ppmv)

3 hPa

10 hPa

50 hPa

Ozone

The uncertainty range attributed to the CCI MERGED_LP product seems underestimated at upper level at least in some regions like near the 3hPa level.

The development of ozone CCI-products can take advantage of a confrontation with the NIWA products that include in-situ observations.

The confrontation with model simulations confirms that the CCI ozone products are suitable for model intercomparison.

The inclusion of IASI data in the CCI-products construction could be an added value.