Copernicus Atmosphere Monitoring Service – Regional Air Quality Production System v1.0
Authors: Colette Augustin , Collin Gaëlle , Besson François , Blot Etienne , Guidard Vincent , Meleux Frederik , Royer Adrien , Petiot Valentin , Miller Claire , Fermond Oihana , Jeant Alizé , Adani Mario , Arteta Joaquim , Benedictow Anna , Bergström Robert , Bowdalo Dene , Brandt Jorgen , Briganti Gino , Carvalho Ana C. , Christensen Jesper Heile , Couvidat Florian , D’Elia Ilia , D’Isidoro Massimo , Denier van der Gon Hugo , Descombes Gaël , Di Tomaso Enza , Douros John , Escribano Jeronimo , Eskes Henk , Fagerli Hilde , Fatahi Yalda , Flemming Johannes , Friese Elmar , Frohn Lise , Gauss Michael , Geels Camilla , Guarnieri Guido , Guevara Marc , Guion Antoine , Guth Jonathan , Hänninen Risto , Hansen Kaj , Im Ulas , Janssen Ruud , Jeoffrion Marine , Joly Mathieu , Jones Luke , Jorba Oriol , Kadantsev Evgeni , Kahnert Michael , Kaminski Jacek W. , Kouznetsov Rostislav , Kranenburg Richard , Kuenen Jeroen , Lange Anne Caroline , Langner Joachim , Lannuque Victor , Macchia Francesca , Manders Astrid , Mircea Mihaela , Nyiri Agnes , Olid Miriam , Pérez García-Pando Carlos , Palamarchuk Yuliia , Piersanti Antonio , Raux Blandine , Razinger Miha , Robertson Lennard , Segers Arjo , Schaap Martijn , Siljamo Pilvi , Simpson David , Sofiev Mikhail , Stangel Anders , Struzewska Joanna , Tena Carles , Timmermans Renske , Tsikerdekis Thanos , Tsyro Svetlana , Tyuryakov Svyatoslav , Ung Anthony , Uppstu Andreas , Valdebenito Alvaro , van Velthoven Peter , Vitali Lina , Ye Zhuyun , Peuch Vincent-Henri , Rouïl Laurence 
Published: December 2024

Abstract. The Copernicus Atmosphere Monitoring Service (CAMS) delivers a range of full, free and open products in relation to atmospheric composition at global and regional scales. The CAMS Regional Service produces daily forecasts, analyses, and reanalyses of air quality in Europe. This Service relies on a distributed modelling production by eleven teams in ten European countries: CHIMERE (France), DEHM (Denmark), EMEP (Norway), EURAD-IM (Germany), GEM-AQ (Poland), LOTOS-EUROS (The Netherlands), MATCH (Sweden), MINNI (Italy), MOCAGE (France), MONARCH (Spain), SILAM (Finland). The project management and coordination of the service is devoted to a Centralised Regional Production Unit. Each model produces every day 24 h analyses for the previous day and 97 h forecasts for 19 chemical species over a spatial domain at 0.1x01. degree resolution (approximately 10 km x 10 km) with 420 points in latitude and 700 in longitude and 10 vertical levels. Six pollen species are also delivered for the surface forecasts. The eleven individual models are then combined into an ENSEMBLE median. In total, more than 82 billion data points are made available for public use on a daily basis. The design of the system follows clear technical requirements in terms of consistency in the model setup and forcing fields (meteorology, surface anthropogenic emission fluxes, and chemical boundary conditions). But it also benefits from a diversity of in the description of atmospheric processes through the design of the eleven European Chemistry Transport Models (CTM) involved. The present article aims to provide a comprehensive technical documentation, both for the setup as well as for the diversity of CTM involved in the Service. We also include an overview of the main output products, their public dissemination and the related evaluation and quality control strategy.