Raúl Arasa

Meteosim S.L.

The effects of increasing the surface reflectance by albedo modifications have been evaluated using an air quality modelling system. We have evaluated the influence over pollutant concentrations of increasing from 0.20 to 0.55 the roof surface albedo (scenario called Albedo1) and increasing from 0.15 to 0.30 the ground surface albedo and from 0.20...

The effects of increasing the surface reflectance by albedo modifications have been evaluated using an air quality modelling system. We have evaluated the influence over pollutant concentrations of increasing from 0.20 to 0.55 the roof surface albedo (scenario called Albedo1) and increasing from 0.15 to 0.30 the ground surface albedo and from 0.20...

The present study has generated and analyzed Climate Change projections in Nicaragua for the period 2010-2040. The obtained results are to be used for evaluating and planning more resilient transport infrastructures in the next decades. This study has focused its efforts to pay attention into the effect of Climate Change on precipitation and temper...

In this work, we compare two state of the art models to simulate large emitters in the local scale. The area of study is in the surroundings of Barcelona, where an important contributor to the SO2 levels is considered. The first modelling system uses the mesoscale meteorological model WRF-ARW, the Air Emission Model of Meteosim, AEMM, and the air q...

The dust generated in arid areas of the planet is a very important source of particulate matter in the air, especially favoured by the presence of winds that can raise erodible material from the surface. These particles have an important influence when making an assessment of the air quality, due to its direct and indirect impact on public health....

Model Output Statistics (MOS) is a well-known technique that allows improving outputs from numerical atmospheric models. In this contribution, we present the development of a MOS algorithm to improve air quality forecasts in Catalonia, a region in the northeast of Spain. These forecasts are obtained from an Eulerian coupled air quality modelling sy...

Meteorological inputs are of great importance when implementing an air quality prediction system. In this contribution, the Weather Research and Forecast (WRF-ARW) model was used to compare the performance of the different cumulus, microphysics and Planet Boundary Layer pa-rameterizations over Bogotá, Colombia. Surface observations were used for co...

In this contribution we present an evaluation of different mitigation plans to improve NO2 levels in Andalusia, a region in the south of Spain. Specifically, we consider four possible mitigation plans: the effects over NO2 concentration of apply changes in the distribution of Vehicles Park; the effect of realize traffic restrictions (affecting to t...

SIAM is an integrated prediction-alert system that provides meterorological and air quality modelling information for industrial activity impact assessment and production emissions daily control. The aim of this system is to provide predictive and hindcast operational products that alert the exceedance of critical thresholds for environmental and m...

SIAM is an integrated prediction-alert system which provides environmental information. The aim of this system is to provide prediction and hindcast products operationally in order to alert the exceedance of critical air quality thresholds. SIAM tool has been developed in order to help performing a better management of the impacts and the conflicti...

SIAM is an integrated prediction-alert system which provides environmental information. The aim of this system is to provide prediction and hindcast products operationally in order to alert the exceedance of critical thresholds in different meteorological dependent fields. The basis of this system is the coupling of meteorological models with appli...

We present a detailed evaluation of the seasonal performance of the Community Multiscale Air Quality (CMAQ) modelling system and the PSU/NCAR meteorological model coupled to a new Numerical Emission Model for Air Quality (MNEQA). The combined system simulates air quality at a fine resolution (3 km as horizontal resolution and 1 h as temporal resolu...

For air quality models, it is important that the meteorological fields derived from meteorological models reflect the best characterisation of the atmosphere. Under strongly thermally-stratified conditions, the determining factors are turbulent kinetic energy and surface layer parameterisations. In this study, the 5th generation Mesoscale Model (MM...

The Community Multiscale Air Quality (CMAQ) model was used along with the Weather Research and Forecasting (WRF) model to study air quality modelling sensitivity to various Planetary Boundary Layer (PBL) schemes and Land Surface Models (LSMs). The performance is assessed and quantified by comparing results with surface observations and the outputs...

During the last decades the amount of gaseous and particulate pollutants that have been injected into the atmosphere has increased significantly. Evidence of this information is the high concentration of NO2 and aerosols that are usually measured in urban and industrial areas, or high concentrations of ozone in many rural areas. Parallel to this in...

The structure and evolution of the sea breeze in the north-west part of the Mediterranean (Catalonia, north-east Spain) is studied both experimentally and, predominantly, using numerical models to increase understanding of sea-breeze structure and three-dimensional (3D) pollution distributions in coastal environments. Sea-breeze components are mode...

After evaluating some meteorological simulations, we detect an error of over 5°C in surface temperature. In order to assess the effect of this anomaly in temperature, we perform new simulations of an emission model and a photochemical model using the correct surface temperature in the meteorological data. Our goal is not to solve the problem in sur...

We examine the ability of a modelling system to forecast the formation and transport of ozone over the North-eastern region of Spain known as Catalonia. To this end, the Community Multiscale Air Quality (CMAQ) modelling system developed by the United States Environmental Protection Agency (US EPA) and the PSU/NCAR mesoscale modelling system MM5 are...

This study focuses on a new emissions model, Numerical Emissions Model for Air Quality (MNEQA), to be used in photochemical simulations and emission control strategies relating to tropospheric ozone pollutants. MNEQA processes available local information from external files and is easily adaptable to any desired spatial resolution. Top-down and bot...

In this study, we show our investigations about the effect on atmospheric aerosol concentrations caused by sea-salt emissions generated in open oceans and in surf zones. We use the CMAQ/MM5/MECA air quality modelling system, taking and do not taking into account sea-salt emissions in order to find that they produce several differences in particulat...

Màster Oficial en Meteorologia, curs 2006-2007 El material particulat a l'atmosfera juga un paper important en el clima i en la química atmosfèrica. Actualment la Comissió Europea determina el valor de 50 µg m-3 com el valor límit diari que no s'ha de superar més de 35 vegades en un any, ja que aquest contaminant afecta la salut dels éssers vius i...

Abstract: The aim of this study is to analyze the dynamics of the sea-breeze and its effects on the 3D pollution transport using ground based monitoring station, Sodar measurements and numerical simulation. We use the non-hydrostatic atmospheric model MM5 coupled to the photochemical model CMAQ. Measurements are basically focused on the determinati...