A
Alan J. Geer
Researcher at European Centre for Medium-Range Weather Forecasts
Publications - 58
Citations - 32953
Alan J. Geer is an academic researcher from European Centre for Medium-Range Weather Forecasts. The author has contributed to research in topics: Data assimilation & Numerical weather prediction. The author has an hindex of 22, co-authored 49 publications receiving 23509 citations. Previous affiliations of Alan J. Geer include University of Reading.
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Journal ArticleDOI
The ERA-Interim reanalysis: configuration and performance of the data assimilation system
Dick Dee,S. Uppala,Adrian Simmons,Paul Berrisford,Paul Poli,Shinya Kobayashi,Ulf Andrae,Magdalena Balmaseda,Gianpaolo Balsamo,Peter Bauer,Peter Bechtold,Anton Beljaars,L. van de Berg,Jean Bidlot,Niels Bormann,C. Delsol,Rossana Dragani,Manuel Fuentes,Alan J. Geer,Leopold Haimberger,Sean Healy,Hans Hersbach,Elías Hólm,Lars Isaksen,P. Kallberg,Martin Köhler,Marco Matricardi,A. P. McNally,B. M. Monge-Sanz,Jean-Jacques Morcrette,B.-K. Park,Carole Peubey,P. de Rosnay,Christina Tavolato,Jean-Noël Thépaut,Frederic Vitart +35 more
TL;DR: ERA-Interim as discussed by the authors is the latest global atmospheric reanalysis produced by the European Centre for Medium-Range Weather Forecasts (ECMWF), which will extend back to the early part of the twentieth century.
Journal ArticleDOI
The ERA5 global reanalysis
Hans Hersbach,Bill Bell,Paul Berrisford,Shoji Hirahara,András Horányi,Joaquín Muñoz-Sabater,Julien Nicolas,Carole Peubey,Raluca Radu,Dinand Schepers,Adrian Simmons,Cornel Soci,Saleh Abdalla,Xavier Abellan,Gianpaolo Balsamo,Peter Bechtold,Gionata Biavati,Jean Bidlot,Massimo Bonavita,Giovanna de Chiara,Per Dahlgren,Dick Dee,Michail Diamantakis,Rossana Dragani,Johannes Flemming,Richard G. Forbes,Manuel Fuentes,Alan J. Geer,Leo Haimberger,Sean Healy,Robin J. Hogan,Elías Hólm,Marta Janisková,Sarah Keeley,Patrick Laloyaux,Philippe Lopez,Cristina Lupu,Gabor Radnoti,Patricia de Rosnay,Iryna Rozum,Freja Vamborg,Sebastien Villaume,Jean-Noël Thépaut +42 more
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An update on the RTTOV fast radiative transfer model (currently at version 12)
Roger Saunders,James Hocking,Emma Turner,Peter Rayer,David A. Rundle,Pascal Brunel,Jérôme Vidot,Pascale Roquet,Marco Matricardi,Alan J. Geer,Niels Bormann,Cristina Lupu +11 more
TL;DR: An update of the RTTOV (Radiative Transfer for TOVS) fast radiative transfer model, which is widely used in the satellite retrieval and data assimilation communities, is given, highlighting the updates and increased capability of the latest versions.
Journal ArticleDOI
Direct 4D-Var assimilation of all-sky radiances. Part I: Implementation
TL;DR: A new radiance-assimilation scheme for microwave-imager observations is described, which unifies the treatment of clear-sky, cloudy and precipitation-affected situations, giving an all-sky approach and minimizes successfully through the use of an incremental technique.
Journal ArticleDOI
All-sky satellite data assimilation at operational weather forecasting centres
Alan J. Geer,Katrin Lonitz,Peter Weston,Masahiro Kazumori,Kozo Okamoto,Yanqiu Zhu,Emily Liu,Andrew Collard,William Bell,Stefano Migliorini,Philippe Chambon,Nadia Fourrié,Min-Jeong Kim,Christina Köpken‐Watts,Christoph Schraff +14 more
TL;DR: In this article, the authors review the development towards assimilating cloud and precipitation-affected satellite radiances at operational forecasting centers and present a framework for the assimilation of humidity retrieved from cloudy observations using Bayesian techniques.