David Duncan works on maintaining and improving the usage of microwave sounder data assimilated at ECMWF. This includes the monitoring of current microwave sounders, as well as research into and implementation of next generation sensors into the data assimilation system. Increased utilisation of current sensors is also a focus, through greater use of all-sky assimilation and treatment of correlated observation errors.
- The global observing system
- Information content in satellite measurements
- Radiative transfer in clouds and precipitation
- Observation errors for satellite sensors
- Variational methods
David earned his master's and doctoral degrees at Colorado State University in Fort Collins, Colorado working with Professor Chris Kummerow from 2010 to 2017. His PhD thesis was on the limits of one-dimensional variational retrievals of microwave imagers, with a focus on clouds and precipitation from the AMSR2 and GMI sensors. From 2017 to early 2019 David was a postdoctoral researcher at Chalmers University in Gothenburg, Sweden working with Professor Patrick Eriksson on clouds and precipitation as seen from active sensors and passive sensors from microwave to sub-millimetre wavelengths. David joined ECMWF in May 2019 as a EUMETSAT research fellow.
- 2025
- Linus Magnusson, Sharanya J. Majumdar, Mohamed L. Dahoui, Niels Bormann, Massimo Bonavita, Philip A. Browne, Andy R. Brown, Giovanna De Chiara, David I. Duncan, Stephen English, Alan J. Geer, Sean Healy, Bruce Ingleby, Anthony P. McNally, Florian Pappenberger, Fernando Prates, Florence Rabier, Patricia de Rosnay, Michael P. Rennie, Francis Warrick (January 2025) The role of observations in ECMWF tropical cyclone initialisation and forecasting, Quarterly Journal of the Royal Meteorological Society. DOI: 10.1002/qj.4924
- 2024
- (December 2024) Forecast impact assessment of a potential ATMS instrument in the early-morning orbit using the EDA method, Technical Memoranda n. 925. DOI: 10.21957/59eb3a9b44
- (October 2024) Assessing RFI flags at passive microwave bands with an NWP model, ESA Contract Report n. ESA AO/1-11605/22/NL/SD. DOI: 10.21957/eefd6f0954
- (May 2024) Vicarious calibration monitoring for MWI and ICI using NWP fields, Eumetsat Contract Report. DOI: 10.21957/7c2d18d2e1
- (February 2024) SURFEM-ocean microwave surface emissivity evaluated, ECMWF Technical Memoranda n. 915. DOI: 10.21957/0af49d82e2
- David I. Duncan, Niels Bormann, Alan J. Geer, Peter Weston (August 2024) Superobbing and Thinning Scales for All-Sky Humidity Sounder Assimilation, Monthly Weather Review. DOI: 10.1175/MWR-D-24-0020.1
- 2023
- (March 2023) Superobbing and Finer Thinning for All-sky Humidity Sounder Assimilation, ECMWF Technical Memoranda n. 905. DOI: 10.21957/5c3b9c8d9f
- (October 2023) Characterisation and correction of orbital biases in AMSU-A and ATMS observations in the ECMWF system, ECMWF Technical Memoranda n. 912. DOI: 10.21957/d281dc221a
- (December 2023) Assimilating FY-3E MWHS-2 obs, and assessing all-sky humidity sounder thinning scales, EUMETSAT/ECMWF Fellowship Programme Research Report n. RR62. DOI: 10.21957/f42a9d9542
- 2022
- Katrin Lonitz, Alan Geer, David I. Duncan, Niels Bormann (April 2022) Developing an all-surface capability for all‑sky microwave radiances, ECMWF Newsletter, issue 171, pp. 23-27. DOI: 10.21957/ag94h613vk
- (May 2022) Assimilation of AMSU-A in All-sky Conditions, Monthly Weather Review n. "5", pp. 1023-1041. DOI: 10.1175/mwr-d-21-0273.1
- Alan Geer, Katrin Lonitz, David I. Duncan, Niels Bormann (April 2022) Improved surface treatment for all-sky microwave observations, ECMWF Technical Memoranda n. 894. DOI: 10.21957/zi7q6hau
- David I. Duncan, Niels Bormann, Alan Geer (August 2022) All-sky Assimilation of AMSU-A Window Channels, EUMETSAT/ECMWF Fellowship Programme Research Report n. 59. DOI: 10.21957/daefm16p8
- (February 2022) Synergistic radar and sub-millimeter radiometer retrievals of ice hydrometeors in mid-latitude frontal cloud systems, Atmospheric Measurement Techniques. DOI: 10.5194/amt-15-677-2022
- 2021
- Linus Magnusson, Sharanya Majumdar, Rebecca Emerton, David Richardson, Magdalena A. Balmaseda, Calum Baugh, Peter Bechtold, Jean Bidlot, Antonino Bonanni, Massimo Bonavita, Niels Bormann, Andy Brown, Philip Browne, Hilda Carr, Mohamed Dahoui, Giovanna De Chiara, Michail Diamantakis, David I. Duncan, Stephen English, Richard Forbes, Alan Geer, Thomas Haiden, Sean Healy, Timothy Hewson, Bruce Ingleby, Martin Janousek, Christian Kühnlein, Simon Lang, Sarah-Jane Lock, Tony McNally, Kristian S. Mogensen, Florian Pappenberger, Inna Polichtchouk, Fernando Prates, Christel Prudhomme, Florence Rabier, Patricia de Rosnay, Tiago Quintino, Michael Rennie (October 2021) Tropical cyclone activities at ECMWF, ECMWF Technical Memoranda n. 888. DOI: 10.21957/zzxzzygwv
- (August 2021) On the Addition of Microwave Sounders and Numerical Weather Prediction Skill, Quarterly Journal of the Royal Meteorological Society. DOI: 10.1002/qj.4149
- (February 2021) Can machine learning correct microwave humidity radiances for the influence of clouds?, Atmospheric Measurement Techniques. DOI: 10.5194/amt-14-2957-2021
- (March 2021) Dual-Polarization Deconvolution and Geophysical Retrievals from the Advanced Microwave Precipitation Radiometer during OLYMPEX/RADEX, Journal of Atmospheric and Oceanic Technology.
- (August 2021) Growing Operational Use of FY-3 Data in the ECMWF System, Advances in Atmospheric Sciences. DOI: 10.1007/s00376-020-0207-3
- Simon Pfreundschuh, Stuart Fox, Patrick Eriksson, David Duncan, Stefan A. Buehler, Manfred Brath, Richard Cotton, Florian Ewald (October 2021) Synergistic radar and sub-millimeter radiometer retrievals of ice hydrometeors in mid-latitude frontal cloud systems. DOI: 10.5194/amt-2021-306
- David I. Duncan, Niels Bormann, Alan Geer, Peter Weston (October 2021) Assimilation of AMSU-A in All-sky Conditions, EUMETSAT/ECMWF Fellowship Programme Research Report. DOI: 10.21957/b3qsdrf2l
- 2020
- (August 2020) Synergistic radar and radiometer retrievals of ice hydrometeors, Atmospheric Measurement Techniques. DOI: 10.5194/amt-13-4219-2020
- Inderpreet Kaur, Patrick Eriksson, Simon Pfreundschuh, David Ian Duncan (December 2020) Can machine learning correct microwave humidity radiances for the influence of clouds?. DOI: 10.5194/amt-2020-464
- David I. Duncan, Niels Bormann (September 2020) On the Addition of Microwave Sounders and NWP Skill, Including Assessment of FY-3D Sounders, EUMETSAT/ECMWF Fellowship Programme Research Report n. 55. DOI: 10.21957/iimhohmqt
- 2019
- (May 2019) On the distinctiveness of observed oceanic raindrop distributions, Atmospheric Chemistry and Physics. DOI: 10.5194/acp-19-6969-2019
- (December 2019) An experimental 2D-Var retrieval using AMSR2, Atmospheric Measurement Techniques. DOI: 10.5194/amt-12-6341-2019
- David Ian Duncan, Patrick Eriksson, Simon Pfreundschuh, Christian Klepp, Daniel C. Jones (February 2019) On the distinctiveness of oceanic raindrop regimes. DOI: 10.5194/acp-2019-34
- David Duncan (April 2019) Response to Reviewers. DOI: 10.5194/acp-2019-34-AC1
- David Ian Duncan, Patrick Eriksson, Simon Pfreundschuh (May 2019) An experimental 2DVAR retrieval using AMSR2. DOI: 10.5194/amt-2019-178
- David Duncan (August 2019) Response to Reviewers. DOI: 10.5194/amt-2019-178-AC1
- Simon Pfreundschuh, Patrick Eriksson, Stefan A. Buehler, Manfred Brath, David Duncan, Richard Larsson, Robin Ekelund (October 2019) Synergistic radar and radiometer retrievals of ice hydrometeors. DOI: 10.5194/amt-2019-369
- Simon Pfreundschuh, Patrick Eriksson, Stefan A. Buehler, Manfred Brath, David Duncan, Richard Larsson, Robin Ekelund (October 2019) Supplementary material to "Synergistic radar and radiometer retrievals of ice hydrometeors". DOI: 10.5194/amt-2019-369-supplement
- 2018
- (July 2018) Towards variational retrieval of warm rain from passive microwave observations, Atmospheric Measurement Techniques. DOI: 10.5194/amt-11-4389-2018
- (February 2018) An update on global atmospheric ice estimates from satellite observations and reanalyses, Atmospheric Chemistry and Physics. DOI: 10.5194/acp-18-11205-2018
- (August 2018) A neural network approach to estimate a posteriori distributions of Bayesian retrieval problems, Atmospheric Measurement Techniques n. 8, pp. 4627-4643. DOI: 10.5194/amt-11-4627-2018
- David Duncan (June 2018) Response to reviewers. DOI: 10.5194/amt-2018-96-AC1
- Simon Pfreundschuh, Patrick Eriksson, David Duncan, Bengt Rydberg, Nina Håkansson, Anke Thoss (March 2018) A neural network approach to estimate a posteriori distributions of Bayesian retrieval problems. DOI: 10.5194/amt-2018-91
- David Ian Duncan, Christian D. Kummerow, Brenda Dolan, Veljko Petković (April 2018) Towards variational retrieval of warm rain from passive microwave observations. DOI: 10.5194/amt-2018-96
- David Ian Duncan, Patrick Eriksson (April 2018) An update on global atmospheric ice estimates from satellite observations and reanalyses. DOI: 10.5194/acp-2018-275
- David Duncan (April 2018) Cloud frequency vs. cloud fraction. DOI: 10.5194/acp-2018-214-SC1
- David Duncan (June 2018) Response to reviewers. DOI: 10.5194/acp-2018-275-AC1
- 2017
- David Ian Duncan, Christian D. Kummerow, Walter N. Meier (September 2017) An Integrated Examination of AMSR2 Products Over Ocean, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing. DOI: 10.1109/jstars.2017.2718535
- (February 2017) Exploring The Limits Of Variational Passive Microwave Retrievals.
- 2016
- David I. Duncan, Christian D. Kummerow (June 2016) A 1DVAR retrieval applied to GMI: Algorithm description, validation, and sensitivities, Journal of Geophysical Research: Atmospheres. DOI: 10.1002/2016jd024808
- 2014
- David I. Duncan, Christian D. Kummerow, Gregory S. Elsaesser (March 2014) A Lagrangian Analysis of Deep Convective Systems and Their Local Environmental Effects, Journal of Climate. DOI: 10.1175/jcli-d-13-00285.1
- 2013
- (February 2013) A Lagrangian perspective on deep convective tropical raining systems.