WRF-Chem Sensitivity to Vertical Resolution During a Saharan Dust Event
Publication date: Available online 8 May 2015 Source:Physics and Chemistry of the Earth, Parts A/B/C Author(s): J.C. Teixeira , A.C. Carvalho , Paolo Tuccella , Gabriele Curci , A. Rocha The Saharan dust event that occurred between the 22 nd and 30 th of June 2012 influenced the atmospheric radiative properties over North Africa, the Iberian Peninsula, the Western Mediterranean basin, extending its effects to France and Southern England. This event is well documented in satellite imagery, as well as on the air quality stations over the Iberian Peninsula and the AERONET NASA network. In order to assess the effect of the model vertical resolution on the extinction coefficient fields, as a proxy to the particulate matter concentrations in the atmosphere, the WRF-Chem model was applied during this period over a mother domain with a resolution of 18 km, covering Europe and North Africa. To this end five model setups differing in the number of vertical levels were tested. Model skills were evaluated by comparing the model results with CALIPSO and EARLINET LIDAR data. Results show that the model is able to simulate the higher level aerosol transport but it is susceptible to the vertical resolution used. This is due to the thickness of the transport layers which is, eventually, thinner than the vertical resolution of the model.When comparing model results to the observed vertical profiles, it becomes evident that the broad features of the extinction coeff...
Source: Physics and Chemistry of the Earth, Parts ABC - Category: Science Source Type: research