000003722 001__ 3722
000003722 005__ 20200129120319.0
000003722 0247_ $$2DOI$$a10.5194/acp-2018-1097
000003722 037__ $$aSCART-2019-0016
000003722 100__ $$aBerckmans, Julie
000003722 245__ $$aValidating the water vapour content from a reanalysis product and a regional climate model over Europe based on GNSS observations
000003722 260__ $$c2018
000003722 520__ $$aThe use of ground-based observations is suitable for the assessment of atmospheric water vapour in climate models. Global Navigation Satellite Systems (GNSS) provide information on the Integrated Water Vapour (IWV), at a high temporal and spatial resolution. We used IWV observations at 100 European GNSS sites to evaluate the regional climate model ALARO running at 20 km horizontal resolution and coupled to the land surface model SURFEX, driven by the European Centre for Medium-Range Weather Forecasts (ECMWF) Interim Re-Analysis (ERA-Interim) data. The observations recorded in the selected stations span from 1996 to 2014 (with minimum 10 years) and were homogeneously reprocessed during the second reprocessing campaign of the EUREF Permanent Network (EPN Repro2). The outcome of the reprocessing was then used to compute IWV time series at these stations. The yearly cycle of the IWV for the 19-year period from 1996 to 2014 reveals that the model simulates well the seasonal variation. Although the model overestimates IWV during winter and spring, it is consistent with the driving field of ERA-Interim. However, the agreement with ERA-Interim is less in summer, when the model demonstrates an underestimation of the IWV. The model presents a cold and dry bias in summer that feedbacks to a lower evapotranspiration and results in too few water vapour. The spatial variability among the sites is high and shows a dependence on the altitude of the stations which is strongest in summer and by ALARO-SURFEX. The IWV diurnal cycle presents best results with ERA-Interim in the morning, whereas ALARO-SURFEX presents best results at midnight.
000003722 594__ $$aSTCE
000003722 700__ $$aVan Malderen, Roeland 
000003722 700__ $$aPottiaux, Eric 
000003722 700__ $$aPacione, Rosa
000003722 700__ $$aHamdi, Rafiq
000003722 773__ $$pAtmospheric Chemistry and Physics Discussion (ACPD)$$y2018
000003722 85642 $$ahttps://www.atmos-chem-phys-discuss.net/acp-2018-1097/
000003722 8560_ $$feric.pottiaux@observatoire.be
000003722 905__ $$apublished in
000003722 980__ $$aREFERD