Twenty-five years ago to this date, Atmósfera joined the already established journals in the field of the atmospheric sciences and provided a new venue for the dissemination of results of research in that area.

We are very thankful to Dr. Graciela B. Raga and her coeditors for the preparation of this thematic issue, which initiates the celebration of Atmósfera's 25th anniversary.

In this anniversary issue of Atmósfera we include an excellent revision of the literature on chlorine in the stratosphere prepared by Thomas von Clarmann, who is a senior researcher and head of the Satellite-Borne Remote Sensing of Trace Gases group…

The year 2014 will be full of challenges for all who are devoted to atmospheric sciences. The weather events of 2013 warn us that the effects of climate change are becoming increasingly severe. In Mexico, for example, for the first…

In this issue we continue to publish review articles focused mainly in mid-latitudes and the Latin American area, as a way of celebrating the 25th anniversary of Atmósfera. In this occasion, Chilean researchers P. Monsalves Gavilán, J. Pincheira Ulbrich and…

In this article synthetic records of longer duration than the historic records of the North Atlantic Oscillation Index were compared. The synthetic records were obtained using the year interchange method and the Svanidze fragments method, as well as the Fiering…

The use of meteorological radars in hydrological modeling is a tool that is becoming more important each day throughout the world. In order to validate its use in hydrological modeling, a study was carried out in the sub-watershed of the…

Anomalies of mean monthly air temperature at 50 surface stations in the contiguous United States during the winter months of January, February and March from 1951 to 1980 are statistically screened as functions of earlier, centered or future time means…

Components of the thermotopographic wind regime in the Mexico City basin are examined in their interaction with the heat island induced centripetal circulation. The resulting wind regime is such that convergent surface flow over the city is predominant mainly during…

Smith's (1969) analytical absorption spectrum of the atmosphere is incorporated in a thermodynamic model. This radiative formulation is applied to the infrared region. It computes separately the absorptivity by carbon dioxide and by water vapor, with a high wave length…