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CALIOPE és un sistema de predicció de la qualitat de l’aire desenvolupat pel Departament de Ciències de la Terra del Barcelona Supercomputing Center - Centre Nacional de Supercomputació (BSC-CNS). Gràcies al potencial quant a tractament i anàlisi de dades que proporciona la supercomputació, CALIOPE ofereix pronòstics de la qualitat de l’aire per a Catalunya, la península Ibèrica i Europa, amb informació detallada sobre els principals contaminants regulats per les autoritats europees. A més, els propers mesos el sistema inclourà la simulació de Barcelona a escala urbana (CALIOPE Urban). Aquesta informació és fàcilment accessible des d’un web dirigit tant a gestors públics com a la ciutadania.Paraules clau: qualitat de l’aire, contaminació atmosfèrica, meteorologia, sistema de pronòstic, emissions, supercomputació., CALIOPE is the air quality forecast system developed by the Earth Sciences Department of Barcelona Supercomputing Center - Centre Nacional de Supercomputació (BSC-CNS). Thanks to the data processing and analysis potential that supercomputing provides, CALIOPE offers air quality forecasts for Catalonia, the Iberian Peninsula and Europe at large, with detailed information on the main pollutants regulated by the European authorities. In the next few months, the system will include Barcelona’s simulation on an urban scale (CALIOPE Urban). This information is easily accessible on a website so that both public administrations and citizens can consult it.Keywords: air quality, air pollution, meteorology, forecast system, emissions, supercomputing.

© 2015 The Authors. Geoscience Data Journal published by Royal Meteorological Society and John Wiley & Sons Ltd. The International Surface Pressure Databank (ISPD) is the world's largest collection of global surface and sea-level pressure observations. It was developed by extracting observations from established international archives, through international cooperation with data recovery facilitated by the Atmospheric Circulation Reconstructions over the Earth (ACRE) initiative, and directly by contributing universities, organizations, and countries. The dataset period is currently 1768–2012 and consists of three data components: observations from land stations, marine observing systems, and tropical cyclone best track pressure reports. Version 2 of the ISPD (ISPDv2) was created to be observational input for the Twentieth Century Reanalysis Project (20CR) and contains the quality control and assimilation feedback metadata from the 20CR. Since then, it has been used for various general climate and weather studies, and an updated version 3 (ISPDv3) has been used in the ERA-20C reanalysis in connection with the European Reanalysis of Global Climate Observations project (ERA-CLIM). The focus of this paper is on the ISPDv2 and the inclusion of the 20CR feedback metadata. The Research Data Archive at the National Center for Atmospheric Research provides data collection and access for the ISPDv2, and will provide access to future versions.