Technical Memoranda

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 Bouallègue; Souhail Boussetta; Martin Leutbecher; Linus Magnusson; Patricia de Rosnay
Addressing near-surface forecast biases: outcomes of the ECMWF project 'Understanding uncertainties in surface atmosphere exchange' (USURF)
11/2020
81202-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; Christel Prudhomme; Shaun Harrigan; Patricia de Rosnay; Joaquin Munoz Sabater; E. Stephens
Trends in the GloFAS-ERA5 river discharge reanalysis
09/2020
81194-trends-glofas-era5-river-discharge-reanalysis.pdf
870
Sebastien Massart; Niels Bormann; Massimo Bonavita; Cristina Lupu
Skin Temperature Analysis for the Assimilation of Clear-Sky Satellite Radiances
08/2020
19723-skin-temperature-analysis-assimilation-clear-sky-satellite-radiances.pdf
869
Inna Polichtchouk; Sylvie Malardel; Michail Diamantakis
Potential temperature as a prognostic variable in hydrostatic semi-implicit semi-Lagrangian IFS
08/2020
19718-potential-temperature-prognostic-variable-hydrostatic-semi-implicit-semi-lagrangian-ifs.pdf
868
Anton Beljaars
Towards optimal parameters for the prediction of near surface temperature and dewpoint
07/2020
19618-towards-optimal-parameters-prediction-near-surface-temperature-and-dewpoint.pdf
867
D Mason; J Garcia-Pintado; Hannah Cloke; Sarah Dance; Joaquin Munoz Sabater
Assimilating high resolution remotely sensed soil moisture into a distributed hydrologic model to improve runoff prediction
06/2020
81176-assimilating-high-resolution-remotely-sensed-soil-moisture-distributed-hydrologic-model.pdf
866
Irina Sandu; Peter Bechtold; L. Nuijens; Anton Beljaars; Andrew Brown
On the causes of systematic forecast biases in near-surface wind direction over the oceans
06/2020
19545-causes-systematic-forecast-biases-near-surface-wind-direction-over-oceans.pdf
865
Zied Ben Bouallègue
Accounting for representativeness in the verification of ensemble forecasts
06/2020
81173-accounting-representativeness-verification-ensemble-forecasts.pdf
864
Michael Rennie; Lars Isaksen
The NWP impact of Aeolus Level-2B Winds at ECMWF
06/2020
19538-nwp-impact-aeolus-level-2b-winds-ecmwf.pdf
863
Alan Geer
Learning earth system models from observations: machine learning or data assimilation?
05/2020
19525-learning-earth-system-models-observations-machine-learning-or-data-assimilation.pdf
861
Alan Geer; Massimo Bonavita; Mats Hamrud
All-sky microwave radiances assimilated with an ensemble Kalman filter
02/2020
19387-all-sky-microwave-radiances-assimilated-ensemble-kalman-filter.pdf
860
Timothy Hewson
Use and Verification of ECMWF products in Member and Co-operating States (2019)
03/2020
81157-use-and-verification-ecmwf-products-member-and-co-operating-states-2019.pdf
859
Adrian Simmons; Cornel Soci; Julien Nicolas; Bill Bell; P. Berrisford; Rossana Dragani; Johannes Flemming; Leopold Haimberger; Sean Healy; Hans Hersbach; Andras Horányi; Antje Inness; Joaquin Munoz Sabater; Raluca Radu; Dinand Schepers
Global stratospheric temperature bias and other stratospheric aspects of ERA5 and ERA5.1
01/2020
81149-global-stratospheric-temperature-bias-and-other-stratospheric-aspects-era5-and-era51.pdf
858
Christopher Roberts; Antje Weisheimer; Stephanie Johnson; Tim Stockdale; Magdalena Alonso Balmaseda; Philip Browne; Andrew Dawson; Martin Leutbecher; Frédéric Vitart
Reduced-resolution ocean configurations for efficient testing with the ECMWF coupled model
01/2020
81145-reduced-resolution-ocean-configurations-efficient-testing-ecmwf-coupled-model.pdf
857
Peter Bauer; Tiago Quintino; Nils Wedi; Antonino Bonanni; Marcin Chrust; Willem Deconinck; Michail Diamantakis; Peter Dueben; Stephen English; Johannes Flemming; Paddy Gillies; Ioan Hadade; James Hawkes; Mike Hawkins; Olivier Iffrig; Christian Kühnlein; Michael Lange; Peter Lean; Olivier Marsden; Andreas Müller; Sami Saarinen; Domokos Sarmany; Michael Sleigh; Simon Smart; Piotr Smolarkiewicz; Daniel Thiemert; Giovanni Tumolo; Christian Weihrauch; Cristiano Zanna; Pedro Maciel
The ECMWF Scalability Programme: Progress and Plans
02/2020
81155-ecmwf-scalability-programme-progress-and-plans.pdf
855
B. Ingleby; L. Isaksen; T. Kral
Evaluation and impact of aircraft humidity data in ECMWF's NWP system
01/2020
19327-evaluation-and-impact-aircraft-humidity-data-ecmwfs-nwp-system.pdf
856
Sebastien Massart
A new hybrid formulation for the background error covariance in the IFS: evaluation
12/2019
19340-new-hybrid-formulation-background-error-covariance-ifs-evaluation.pdf
854
Frédéric Vitart; Magdalena Alonso Balmaseda; Laura Ferranti; Angela Benedetti; Beena Balan-Sarojini; Steffen Tietsche; Junchen Yao; Martin Janousek; Gianpaolo Balsamo; Martin Leutbecher; Peter Bechtold; Inna Polichtchouk; David Richardson; Tim Stockdale; Christopher Roberts
Extended-range prediction
11/2019
81133-extended-range-prediction.pdf
853
Thomas Haiden; Martin Janousek; Frédéric Vitart; Laura Ferranti; Fernando Prates
Evaluation of ECMWF forecasts, including the 2019 upgrade
11/2019
19277-evaluation-ecmwf-forecasts-including-2019-upgrade.pdf
852
orcid.org/0000-0002-4223-5831 Groenemeijer; orcid.org/0000-0002-4983-0449 Púcik; Ivan Tsonevsky; Peter Bechtold
An Overview of Convective Available Potential Energy and Convective Inhibition provided by NWP models for operational forecasting
11/2019
19278-overview-convective-available-potential-energy-and-convective-inhibition-provided-nwp-models.pdf
851
Linus Magnusson
ECMWF Severe Event Catalogue for Evaluation of Multi-scale Prediction of Extreme Weather
10/2019
81119-ecmwf-severe-event-catalogue-evaluation-multi-scale-prediction-extreme-weather.pdf