Technical Memoranda

819
Michail Diamantakis; Anna Agusti-Panareda
A positive definite tracer mass fixer for high resolution weather and atmospheric composition forecasts
2017
17914-positive-definite-tracer-mass-fixer-high-resolution-weather-and-atmospheric-composition.pdf
817
Thomas Haiden; Martin Janousek; Jean-Raymond Bidlot; Laura Ferranti; F. Prates; Frédéric Vitart; Peter Bauer; David Richardson
Evaluation of ECMWF forecasts, including 2016-2017 upgrades
2017
17913-evaluation-ecmwf-forecasts-includuing-2016-2017-upgrades.pdf
816
Robin Hogan; Maike Ahlgrimm; Gianpaolo Balsamo; Anton Beljaars; P. Berrisford; Alessio Bozzo; Francesca Di Giuseppe; R.M. Forbes; Thomas Haiden; Simon Lang; Michael Mayer; I. Polichtchouk; Irina Sandu; Frédéric Vitart; Nils Wedi
Radiation in numerical weather prediction
2017
17771-radiation-numerical-weather-prediction.pdf
815
Alan Geer; Maike Ahlgrimm; Peter Bechtold; Massimo Bonavita; Niels Bormann; Stephen English; Mark Fielding; Richard Forbes; Robin Hogan; Elias Hólm; Marta Janiskova; Katrin Lonitz; Philippe Lopez; Marco Matricardi; Irina Sandu; P. Weston
Assimilating observations sensitive to cloud and precipitation
2017
17718-assimilating-observations-sensitive-cloud-and-precipitation.pdf
814
Sebastien Massart; Anna Agusti-Panareda; Johannes Flemming
Evidence of a stratospheric methane bias in the IFS against MIPAS data
2017
17698-evidence-stratospheric-methane-bias-ifs-against-mipas-data.pdf
812
Marco Matricardi; López Puertas; B. Funke
Modeling of nonlocal thermodynamic equilibrium effects in the classical and principal component based version of the RTTOV fast radiative transfer model
2017
17672-modeling-nonlocal-thermodynamic-equilibrium-effects-classical-and-principal-component-based.pdf
811
D.L. Bergman; L. Magnusson; J. Nilsson; Frédéric Vitart
Forecasting tropical cyclone landfall using ECMWF's seasonal forecasts from System 4
2017
17679-forecasting-tropical-cyclone-landfall-using-ecmwfs-seasonal-forecasts-system4.pdf
810
Massimo Bonavita; Mohamed Dahoui; Philippe Lopez; F. Prates; Elias Hólm; Giovanna De Chiara; Alan Geer; L. Isaksen; B. Ingleby
On the initialization of Tropical Cyclones
2017
17677-initialization-tropical-cyclones.pdf
809
I. Polichtchouk; Robin Hogan; T.G. Shepherd; Peter Bechtold; Tim Stockdale; S. Malardel; Sarah-Jane Lock; L. Magnusson
What influences the middle atmosphere circulation in the IFS?
2017
17670-what-influences-middle-atmosphere-circulation-ifs.pdf
808
A.T. Weaver; S. Gurol; J. Tshimanga; Marcin Chrust; A. Piacentini
"Time" -parallel diffusion-based correlation operators
2017
17578-time-parallel-diffusion-based-correlation-operators.pdf
807
B. Ingleby
An assessment of different radiosonde types 2015/2016
2017
17551-assessment-different-radiosonde-types-20152016.pdf
806
Roberto Buizza; Erik Andersson; Richard Forbes; M. Sleigh
The ECMWF research to operations (R20) process
2017
17549-ecmwf-research-operations-r20-process.pdf
805
H. Xiao; Michail Diamantakis; S. Saarinen
An OpenACC GPU adaptation of the IFS cloud microphysics scheme
2017
17320-openacc-gpu-adaptation-ifs-cloud-microphysics-scheme.pdf
804
Niels Bormann; Cristina Lupu; Alan Geer; Heather Lawrence; P. Weston; Stephen English
Assessment of the forecast impact of suface-sensitive microwave radiances over land and sea-ice
2017
17674-assessment-forecast-impact-suface-sensitive-microwave-radiances-over-land-and-sea-ice.pdf
803
Steffen Tietsche; Magdalena Alonso-Balmaseda; Hao Zuo; Patricia de Rosnay
Comparing Arctic winter sea-ice thickness from SMOS and ORAS5
2017
17275-comparing-arctic-winter-sea-ice-thickness-smos-and-oras5.pdf
802
P. Chambon; Alan Geer
All-sky assimilation of Megha-Tropiques/SAPHIR radiances in the ECMWF numerical weather prediction system
2017
17253-all-sky-assimilation-megha-tropiquessaphir-radiances-ecmwf-numerical-weather-prediction.pdf
801
Alessio Bozzo; S. Remy; Angela Benedetti; Johannes Flemming; Peter Bechtold; Mark Rodwell; J.-J. Morcrette
Implementation of a CAMS-based aerosol climatology in the IFS
2017
17219-implementation-cams-based-aerosol-climatology-ifs.pdf
800
Massimo Bonavita; Y. Trémolet; Elias Hólm; S. Lang; Marcin Chrust; Marta Janiskova; Philippe Lopez; Patrick Laloyaux; Patricia de Rosnay; Mike Fisher; M. Hamrud; Stephen English
A Strategy for Data Assimilation
2017
17179-strategy-data-assimilation.pdf
799
Peter Lean; Alan Geer; Katrin Lonitz
Assimilation of Global Precipitation Mission (GPM) Microwave Imager (GMI) in all-sky conditions
2017
17174-assimilation-global-precipitation-mission-gpm-microwave-imager-gmi-all-sky-conditions.pdf
798
Heather Lawrence; F. Carminati; W. Bell; Niels Bormann; S. Newman; Nigel Atkinson; Alan Geer; S. Migliorini; Qifeng Lu; K. Chen
An evaluation of FY-3C MWRI and Assessment of the long-term quality of FY-3C MWHS-2 at ECMWF and the Met Office
2017
17206-evaluation-fy-3c-mwri-and-assessment-long-term-quality-fy-3c-mwhs-2-ecmwf-and-met-office.pdf
797
Tim Hewson
Use and verification of ECMWF products in Member and Co-operating States (2016)
2017
17100-use-and-verification-ecmwf-products-member-and-co-operating-states-2016.pdf
796
L. Magnusson
Diagnostic methods for understanding the origin of forecast errors
2017
17097-diagnostic-methods-understanding-origin-forecast-errors.pdf
795
Hao Zuo; Magdalena Alonso-Balmaseda; Eric de Boisseson; S. Hirahara; Marcin Chrust; Patricia de Rosnay
A generic ensemble generation scheme for data assimilation and ocean analysis
2017
17831-generic-ensemble-generation-scheme-data-assimilation-and-ocean-analysis.pdf
794
K.S. Mogensen; L. Magnusson; Jean-Raymond Bidlot
Tropical Cyclone Sensitivity to Ocean Coupling
2017
16980-tropical-cyclone-sensitivity-ocean-coupling.pdf