Technical Memoranda

895
Chloe Brimicombe; Tiago Quintino; Simon Smart; Claudia Di Napoli; Robin Hogan; Hannah Cloke; Florian Pappenberger
Calculating the Cosine of the Solar Zenith Angle for Thermal Comfort Indices
04/2022
20336-calculating-cosine-solar-zenith-angle-thermal-comfort-indices.pdf
894
Alan Geer; Katrin Lonitz; David Duncan; Niels Bormann
Improved surface treatment for all-sky microwave observations
04/2022
20337-improved-surface-treatment-all-sky-microwave-observations.pdf
893
Takafumi Kanehama; Irina Sandu; Anton Beljaars; Annelize van Niekerk; Nils Wedi; Souhail Boussetta; Simon Lang; Stephanie Johnson; Linus Magnusson
Evaluation and optimizaton of orographic drag in the IFS
03/2022
20333-evaluation-and-optimizaton-orographic-drag-ifs.pdf
892
Philippe Lopez; Marco Matricardi; Mark Fielding
Validation of IFS+RTTOV/MFASIS solar reflectances against GOES-16 ABI obs
03/2022
20332-validation-ifsrttovmfasis-solar-reflectances-against-goes-16-abi-obs.pdf
891
Linus Magnusson; Magdalena Alonso-Balmaseda; Mohamed Dahoui; Richard Forbes; Thomas Haiden; David Lavers; Irina Sandu; Steffen Tietsche
Summary of the UGROW subproject on tropospheric temperature bias during JJA over the Northern Hemisphere
03/2022
20356-summary-ugrow-subproject-tropospheric-temperature-bias-during-jja-over-northern-hemisphere.pdf
890
Peter Janssen
Notes on shallow water extension of Miles Theory
02/2022
20286-notes-shallow-water-extension-miles-theory.pdf
889
Frédéric Vitart; Rebecca Emerton; Mark Rodwell; Magdalena Alonso-Balmaseda; Thomas Haiden; Stephanie Johnson; L. Magnusson; Christopher Roberts; Irina Sandu
Investigating biases in the representation of the Pacific sub-tropical jet stream and associated teleconnections (a UGROW sub-project)
01/2022
20281-investigating-biases-representation-pacific-sub-tropical-jet-stream-and-associated.pdf
888
Linus Magnusson; Sharan Majumdar; Rebecca Emerton; David Richardson; Magdalena Alonso-Balmaseda; C. Baugh; Peter Bechtold; Jean-Raymond Bidlot; Antonino Bonanni; Massimo Bonavita; Niels Bormann; Andy Brown; Philip Browne; Hilda Carr; Mohamed Dahoui; Giovanna De Chiara; Michail Diamantakis; David Duncan; Stephen English; Richard Forbes; Alan Geer; Thomas Haiden; Sean Healy; Tim Hewson; B. Ingleby; Martin Janousek; Christian Kuehnlein; Simon Lang; Sarah-Jane Lock; Tony McNally; Kristian Mogensen; Florian Pappenberger; Inna Polichtchouk; Fernando Prates; C. Prudhomme; Florence Rabier; Patricia de Rosnay; Tiago Quintino; Michael Rennie
Tropical cyclone activities at ECMWF
10/2021
20228-tropical-cyclone-activities-ecmwf.pdf
887
Ryan Williams; Robin Hogan; Inna Polichtchouk; Michaela Hegglin; Tim Stockdale; Johannes Flemming
Evaluating the impact of prognostic ozone in IFS NWP forecasts
10/2021
20190-evaluating-impact-prognostic-ozone-ifs-nwp-forecasts.pdf
886
Niels Bormann
Investigating the use of Lambertian reflection in the assimilation of surface-sensitive microwave sounding radiances over snow and sea-ice
09/2021
20180-investigating-use-lambertian-reflection-assimilation-surface-sensitive-microwave-sounding.pdf
885
Tim Hewson
Use and Verification of ECMWF products in Member and Co-operating States
09/2021
20179-use-and-verification-ecmwf-products-member-and-co-operating-states.pdf
884
Thomas Haiden; Martin Janousek; Frédéric Vitart; Zied Ben-Bouallegue; Laura Ferranti; Fernando Prates
Evaluation of ECMWF forecasts, including the 2021 upgrade
09/2021
20142-evaluation-ecmwf-forecasts-including-2021-upgrade.pdf
882
Peter Janssen; Jean-Raymond Bidlot
On the consequences of nonlinearity and gravity-capillary waves on wind-wave interaction
02/2021
19943-consequences-nonlinearity-and-gravity-capillary-waves-wind-wave-interaction.pdf
881
Adrian Simmons; Hans Hersbach; Joaquin Munoz-Sabater; Julien Nicolas; Freja Vamborg; Paul Berrisford; Patricia de Rosnay; Kate Willett; Jack Woollen
Low frequency variability and trends in surface air temperature and humidity from ERA5 and other datasets
02/2021
19911-low-frequency-variability-and-trends-surface-air-temperature-and-humidity-era5-and-other.pdf
880
Thomas Haiden; Martin Janousek; Frédéric Vitart; Zied Ben-Bouallegue; Laura Ferranti; Crtistina Prates; David Richardson
Evaluation of ECMWF forecasts, including the 2020 upgrade
01/2021
19879-evaluation-ecmwf-forecasts-including-2020-upgrade.pdf
879
Tomas Pucik; Pieter Groenemeijer; Ivan Tsonevsky
Vertical wind shear and convective storms
01/2021
19905-vertical-wind-shear-and-convective-storms.pdf
878
Peter Düben; Umberto Modigliani; Alan Geer; Stephan Siemen; Florian Pappenberger; Peter Bauer; Andy Brown; Martin Palkovic; Baudouin Raoult; Nils Wedi; Vasileios Baousis
Machine learning at ECMWF: A roadmap for the next 10 years
01/2021
19877-machine-learning-ecmwf-roadmap-next-10-years.pdf
877
Inna Polichtchouk; Peter Bechtold; Massimo Bonavita; Richard Forbes; Sean Healy; Robin Hogan; Patrick Laloyaux; Michael Rennie; Tim Stockdale; Nils Wedi; Michail Diamantakis; Johannes Flemming; Stephen English; Lars Isaksen; Filip Vána; Sonja Gisinger; Nicholas Byrne
Stratospheric modelling and assimilation
01/2021
19875-stratospheric-modelling-and-assimilation.pdf
876
Ervin Zsótér; C. Baugh; Eleanor Hansford; K O'Regan; Claudia Vitolo; Fredrik Wetterhall; C. Prudhomme
Floods, droughts, fire and beyond ... are existing forecasts enough?
01/2021
19907-floods-droughts-fire-and-beyond-are-existing-forecasts-enough.pdf
874
Peter Bechtold; M Bramberger; A. Dörnbrack; L. Isaksen; Martin Leutbecher
Experimenting with a Clear Air Turbulence (CAT) Index from the IFS
01/2021
19870-experimenting-clean-air-turbulence-cat-index-ifs.pdf
875
Irina Sandu; Thomas Haiden; Gianpaolo Balsamo; Polly Schmederer; Gabriele Arduini; Jonathan Day; Anton Beljaars; Zied Ben-Bouallegue; Souhail Boussetta; Martin Leutbecher; L. Magnusson; Patricia de Rosnay
Addressing near-surface forecast biases: outcomes of the ECMWF project 'Understanding uncertainties in surface atmosphere exchange' (USURF)
11/2020
19849-addressing-near-surface-forecast-biases-outcomes-ecmwf-project-understanding-uncertainties.pdf
873
Frederico Johannsen; Linus Magnusson; Emanuel Dutra
Evaluation of biases and skill of ECMWF Summer sub-seasonal forecasts in the Northern Hemisphere
10/2020
19805-evaluation-biases-and-skill-ecmwf-summer-sub-seasonal-forecasts-northern-hemisphere.pdf
872
Philippe Lopez
Quality Control for GOES Geostationary Lightning Mapper Level-2 flash products
10/2020
19804-quality-control-goes-geostationary-lightning-mapper-level-2-flash-products.pdf
871
Ervin Zsótér; Hannah orcid.org/0000-0002-1472-868X; C. Prudhomme; Shaun Harrigan; Patricia de Rosnay; J. Munoz-Sabater; E. Stephens
Trends in the GloFAS-ERA5 river discharge reanalysis
09/2020
81194-trends-glofas-era5-river-discharge-reanalysis.pdf