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WRF evaluation exercise using open sea in situ measurements and land coastal data

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#Modelli meteorologici

pubblicazioni - Memoria

WRF evaluation exercise using open sea in situ measurements and land coastal data

The present work regards a model evaluation exercise concerning the well known WRF meteorological model (http://wrf-model.org) and in situ measurements collected both on land and in open sea. In particular, this exercise is finalised to understand the skill of the model to act as meteorological pre-processor in order to simulate aerosol emissions from the sea, an important factor to correctly predict pollutant levels. The WRF dynamics and physics options have been set up by “Research on Energy Systems” (RSE S.p.A.) studies in order to simulate the meteorological fields over two different domains: a master domain with 45 km spatial resolution that covers the whole Europe and it is intended to capture synoptic features and general circulation patterns, and a nested one that covers the whole Italian Peninsula, with a grid step of 15 km. Among the WRF outputs, we focus on wind velocity, temperature, pressure and relative humidity, which are the most relevant ones for our purpose. The test is carried out for the July-December 2005 period over the Ligurian Sea region, a very complex area where the strong air-sea interactions and orography significantly affect the atmospheric circulation. Data for evaluation were collected both over land at four WMO meteorological coastal/inland stations and over the sea by the ODAS Italia 1 observing system (http://www.odas.ge.issia.cnr.it) that is the only spar buoy in the Mediterranean sea. It is a stable measuring platform for collecting meteorological and surface data offshore and it is moored in the Ligurian Sea on a seabed of 1270 m at about 75 km far from the coast. The buoy hosts a small laboratory on its top and it is equipped with a set of meteorological and marine sensors whose measurements are continuously collected and transmitted in near real time to the station ashore at CNR in Genoa. Performances of two model versions, WRF 3.0 and WRF 3.2.1, have been compared using both graphical methodologies and the statistical processor AMET (Atmospheric Model Evaluation Tool, implemented by CMAS, http://www.cmascenter.org).

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#Modelli meteorologici

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