Naslov
EURO-­CORDEX and MED-CORDEX near‐surface wind field over the Adriatic region: is there an added value in high resolution RCM simulations?

Autori
Belušić, Andreina ; Telišman Prtenjak, Maja ; Güttler, Ivan

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Skup
ICRC-CORDEX 2016

Mjesto i datum
Stockholm, Švedska, 17.05.2016. - 20.05.2016

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
added value; near-surface wind; RCM

Sažetak
Over the past few decades the horizontal resolution of regional climate models (RCMs) has steadily increased. In parallel, efforts were put into creation of coordinated sets of regional downscaled simulations with typical horizontal resolutions ranging from 50 km to 12.5 km. This enables to tackle two important questions: Do RCMs add value beyond the resolution of the global reanalysis or global climate simulations? Do the 12.5 km resolution simulations provide further information to 50 km resolution simulations, and if so how it is perceived? To address these questions, our study explores observed and simulated near-surface wind over the eastern Adriatic and Pannonian regions. Due to the diverse topography, these particular regions represent an excellent test area for the climate simulations of the latest generation of the RCMs. Surface station observation data from the 1996‐2008 period have been compared against the daily output obtained from a suite of nine CORDEX RCM simulations (six from EURO‐CORDEX: CLMcom ‐CCLM4-­8‐17, DMI‐HIRHAM5, IPSL‐INERIS‐WRF331F, KNMI‐RACMO22E, SMHI‐RCA4, DHMZ‐RegCM4, and three from MED‐CORDEX: CNRM‐ALADIN5, ICTP‐RegCM4, UCLM‐PROMES), where all simulations are forced by the ECMWF ERA‐Interim reanalysis. Each ensemble member has a 12.5 km and 50 km resolution simulations. Furthermore, for the proper comparison between 12.5 km and 50 km resolution simulations, the upscaling of the 12.5 km model resolution is performed. This approach adds nine wind fields to the evaluation set. Moreover, several methodological aspects related to the interpolation techniques when comparing RCMs and observations (or RCMs at two different resolutions) are examined. To provide an answer to the first question of interest, we discuss a measures‐oriented approach (e.g. Brier skill score) and a distributions-oriented approach (e.g. Perkins skill score), both disclosing season and location dependence. The evaluation reveals strong sensitivity of the simulated wind flow to the RCM horizontal resolution (12.5 km vs. 50 km), giving an insight to the later question. Moreover, RCMs are explored in terms of skill in reproducing specific wind regimes over the Adriatic region (e.g. the bora) where large spread in the RCM ensemble is found. The results of this study will provide the basis for the next steps where wind field, in an ensemble of RCMs forced by the GCMs in historical and future climate runs, will be examined over the Adriatic and Pannonian regions.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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