Niels Bormann
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View article: A first global view of sub-millimetre radiances from the Arctic Weather Satellite
A first global view of sub-millimetre radiances from the Arctic Weather Satellite Open
View article: Identification and attribution of RFI Sources using NWP departure statistics
Identification and attribution of RFI Sources using NWP departure statistics Open
View article: Impact of RFI on Numerical Weather Prediction and Climate Reanalysis
Impact of RFI on Numerical Weather Prediction and Climate Reanalysis Open
View article: GraphDOP: Towards skilful data-driven medium-range weather forecasts learnt and initialised directly from observations
GraphDOP: Towards skilful data-driven medium-range weather forecasts learnt and initialised directly from observations Open
We introduce GraphDOP, a new data-driven, end-to-end forecast system developed at the European Centre for Medium-Range Weather Forecasts (ECMWF) that is trained and initialised exclusively from Earth System observations, with no physics-ba…
View article: Data driven weather forecasts trained and initialised directly from observations
Data driven weather forecasts trained and initialised directly from observations Open
Skilful Machine Learned weather forecasts have challenged our approach to numerical weather prediction, demonstrating competitive performance compared to traditional physics-based approaches. Data-driven systems have been trained to foreca…
View article: Using Model Cloud Information to Reassign Low-Level Atmospheric Motion Vectors in the ECMWF Assimilation System
Using Model Cloud Information to Reassign Low-Level Atmospheric Motion Vectors in the ECMWF Assimilation System Open
This paper investigates the use of model cloud information in the assimilation of low-level atmospheric motion vectors (AMVs) in the ECMWF global data assimilation system, with the aim to characterize and address issues encountered in the …
View article: The potential of numerical prediction systems to support the design of Arctic observing systems: Insights from the <scp>APPLICATE</scp> and <scp>YOPP</scp> projects
The potential of numerical prediction systems to support the design of Arctic observing systems: Insights from the <span>APPLICATE</span> and <span>YOPP</span> projects Open
Numerical systems used for weather and climate predictions have substantially improved over past decades. We argue that despite a continued need for further addressing remaining limitations of their key components, numerical prediction sys…
View article: Multi-sensor analyses of the skin temperature for the assimilation of satellite radiances in the European Centre for Medium-Range Weather Forecasts (ECMWF) Integrated Forecasting System (IFS, cycle 47R1)
Multi-sensor analyses of the skin temperature for the assimilation of satellite radiances in the European Centre for Medium-Range Weather Forecasts (ECMWF) Integrated Forecasting System (IFS, cycle 47R1) Open
The assimilation of clear-sky radiance in the European Centre for Medium-Range Weather Forecasts (ECMWF) atmospheric analysis relies on the clear-sky radiances observation operator. Some of these radiances have frequencies that make them s…
View article: Comment on gmd-2021-37
Comment on gmd-2021-37 Open
Abstract. The assimilation of clear-sky radiance in the European Centre for Medium-Range Weather Forecasts (ECMWF) atmospheric analysis relies on the clear-sky radiances observation operator. Some of these radiances have f…
View article: Comment on gmd-2021-37
Comment on gmd-2021-37 Open
Abstract. The assimilation of clear-sky radiance in the European Centre for Medium-Range Weather Forecasts (ECMWF) atmospheric analysis relies on the clear-sky radiances observation operator. Some of these radiances have f…
View article: Multi-sensor analyses of the skin temperature for the assimilation of satellite radiances in the European Centre for Medium-Range Weather Forecasts (ECMWF) Integrated Forecasting System (IFS, cycle 47R1)
Multi-sensor analyses of the skin temperature for the assimilation of satellite radiances in the European Centre for Medium-Range Weather Forecasts (ECMWF) Integrated Forecasting System (IFS, cycle 47R1) Open
The assimilation of clear-sky radiance in the European Centre for Medium-Range Weather Forecasts (ECMWF) atmospheric analysis relies on the clear-sky radiances observation operator. Some of these radiances have frequencies that make them s…
View article: Relative impact of observations on a regional Arctic numerical weather prediction system
Relative impact of observations on a regional Arctic numerical weather prediction system Open
The impact of Arctic conventional and satellite observations on regional short‐range weather forecasts is assessed using observing‐system experiments, in which observations are removed (denied) when creating the initial conditions of the f…
View article: Continuous data assimilation for global numerical weather prediction
Continuous data assimilation for global numerical weather prediction Open
A new configuration of the European Centre for Medium‐Range Weather Forecasts (ECMWF) incremental 4D‐Var data assimilation (DA) system is introduced which builds upon the quasi‐continuous DA concept proposed in the mid‐1990s. Rather than w…
View article: Assessment of New Satellite Missions within the Framework of Numerical Weather Prediction
Assessment of New Satellite Missions within the Framework of Numerical Weather Prediction Open
Confidence in the use of Earth observations for monitoring essential climate variables (ECVs) relies on the validation of satellite calibration accuracy to within a well-defined uncertainty. The gap analysis for integrated atmospheric ECV …
View article: Increased Arctic influence on the midlatitude flow during Scandinavian Blocking episodes
Increased Arctic influence on the midlatitude flow during Scandinavian Blocking episodes Open
Recent studies have suggested that Arctic teleconnections affect the weather of the midlatitudes on time‐scales relevant for medium‐range weather forecasting. In this study, we use several numerical experimentation approaches with a state‐…
View article: Use and impact of Arctic observations in the ECMWF Numerical Weather Prediction system
Use and impact of Arctic observations in the ECMWF Numerical Weather Prediction system Open
This paper presents an assessment of the usage of Arctic atmospheric observations in the Numerical Weather Prediction (NWP) system of the European Centre for Medium‐Range Weather Forecasts, and of their impact on the quality of short‐ to m…
View article: Global observing system experiments in the ECMWF assimilation system
Global observing system experiments in the ECMWF assimilation system Open
View article: An update on the RTTOV fast radiative transfer model (currently at version 12)
An update on the RTTOV fast radiative transfer model (currently at version 12) Open
This paper gives 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. RTTOV is a fast radiative transfer model for simulating…
View article: An update on the RTTOV fast radiative transfer model (currently at version 12)
An update on the RTTOV fast radiative transfer model (currently at version 12) Open
This paper gives 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. RTTOV is a fast radiative transfer model for simulating …
View article: On the representation error in data assimilation
On the representation error in data assimilation Open
Representation, representativity, representativeness error, forward interpolation error, forward model error, observation‐operator error, aggregation error and sampling error are all terms used to refer to components of observation error i…
View article: Slant path radiative transfer for the assimilation of sounder radiances
Slant path radiative transfer for the assimilation of sounder radiances Open
This paper reports on the influence of taking the slanted satellite viewing geometry better into account in the simulation and assimilation of sounding radiances. The traditional approach is to use a vertical profile extracted at the geo-l…
View article: Assessment of FY-3A and FY-3B MWHS Observations
Assessment of FY-3A and FY-3B MWHS Observations Open
The Fengyun-3 series of satellites (FY-3) began in May 2008 with the launch of FY-3A. The onboard Microwave Humidity Sounders (MWHSs) provide vertical information about water vapor, which is important for numerical weather prediction (NWP)…