Clemente Tomás

• PhD
• Senior Researcher at University of Salamanca

The use of six indices associated with geostrophic wind and vorticity has allowed a classification of circulation weather types to be determined. This classification was employed to study the impact of low-level circulations at low levels on the daily number of forest fires over the western Iberian Peninsula (Portugal and the Spanish region of Gali...

This study analyses the research on disdrometers based on published studies. To do so, a wide data base of bibliographic references has been used: the Web of Science (published by Thomson Reuters). The search was carried out for all of the articles whose "TOPIC" was disdrometer. The more than 300 articles found were analysed according to various cr...

This study was carried out in the region of Castile and Leon, Spain, from 1980 to 1998 and analyzes the relationship between the number of monthly deaths caused by cardiovascular, respiratory and digestive diseases and three meteorological variables: temperature, pressure and humidity. One of the innovations in this study is the application of prin...

The aim of this study is to evaluate the possible associations between daily hospital admissions for cardiovascular, respiratory and digestive diseases in Salamanca (Spain) and weather conditions during the winters of 1995–2005. An objective daily air mass classification was performed by means of statistical analysis of ground-level meteorological...

We examined the possible relationships between pollutant concentrations and mortality at seven different locations of Castilla-León, Spain, and the relationships between such concentration levels and emergency admissions (morbidity) at four hospitals in the region, taking into account the possible masking effect of other atmospheric variables. The...

The characteristics (annual and diurnal cycle, polarity, multiplicity and first stroke peak current) of ∼4.3×106 cloud-to-ground flashes recorded in the Iberian Peninsula during the first decade of measurements of the lightning detection network installed in Spain are analyzed. The mean monthly variation shows maximum lightning activity between May...

The relationship between the North Atlantic oscillation (NAO) and winter (November to March) convection is analysed using two convective parameters: convective precipitation (CP) and cloud-to-ground (CG) lightning. Using winter CP values from 1950 to 2000 over the North Atlantic and western European area (30–70 °N, 60 °W–10 °E), positive correlatio...

Based on the use of an objective classification method for the general atmospheric circulation observed over the Iberian Peninsula for the 1990–98 period, we have characterized the daily circulation by means of a set of indices associated with the direction and vorticity of the geostrophic flow. We analyse the synoptic characteristics of the types...

Several new studies published over the past decade have demonstrated a link between ambient air pollution and several adverse effects on human health even at the lower concentrations typically observed in North America and Europe today, suggesting that air pollution may pose a risk to public health. The effects on human health of gaseous air pollut...

This work presents a regionalization of Castilla y León, an area located in the northwest portion of Spain, using 5-day rainfall. Daily data were available for 119 sites for the 6-year period 1990-1995, between the months of September and May. The region presents a special orography which affects the final results. Following similar studies (Van Re...

Ozone is a secondary air pollutant that has received extensive attention in the literature, mainly because of the adverse effects that exposure to it can cause, particularly in vegetation during the growing season. Because meteorological conditions strongly influence the efficiency of photochemical processes leading to ozone formation and destructi...

In this study a set of cyclone frequency statistics is developed and the prevailing tracks of cyclones are derived for a region of the world that has not been previously investigated in detail. Analysis reveals that Turkey experiences the effects of five dominant cyclone trajectories. Investigation of the seasonal variability of the cyclone frequen...

The primary aim of the present work is to describe and analyze the temporal trends of concurrent hourly observations and its daily averaged series of the pollutants CO, NO2, NO and SO2 in the urban area of the City of Salamanca (environmental survey station SA001) for the period between 1 December 1993 and 30 November 1994. Using daily series corre...

This is a first-approach study tending to correlate solar radiation and temperature with total particulate matter in Santiago, Chile, a city heavily polluted by this contaminant.Experimental data for monthly average total radiation, , were provided by the Chilean Meteorological Bureau. Diffuse monthly average radiation, , was calculated. The concen...