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Recent Book “Inverse Modeling” … Roland at the RIKEN (Intern. Symposium on Data Assimilation in Kobe, Japan) March 2017
Data Assimilation and Inverse Problems
Our Division for Data Assimilation (FE12) of the German Weather Service (DWD), a part of the
German Ministery of Transport and Digital Infrastructure (BMVI),
is working on data assimilation for numerical weather prediction (NWP).
Our main task is to provide
operational data assimilation for the global ICON NWP-model (13km resolution, 90 layers 75km height), run every 3 hours 24/7,
with its mesoscale two-way-nesting area over Europe (6.5km resolution) and the
high-resolution convection-permitting COSMO model over central Europe (2.8/2.2km resolution, 24km height) every hour 24/7.
This includes ensemble data assimilation for the ensemble prediction systems ICON-EPS (40/20km resolution)
as well as COSMO-DE-EPS (2.8/2.2km resolution) and a mean (best) state estimator for the
deterministic runs (13/6.5km and 2.8/2.2km). A core goal is to replace COSMO by the ICON-LAM model with
2/1km resolution over central Europe operationally in about 2020/21. We run a hybrid
ensemble-variational data assimilation scheme (EnVar) globally and a Local Ensemble Transform Kalman
Filter (4D-LETKF) for our reginal data assimilation.
Data Assimilation includes the use of a broad varity of both direct and remote sensing measurements
Ground Stations and Ships (SYNOP),
Radio Sondes (TEMP) and dropsondes,
Air Planes (AMDAR, AIREP, ACAR, …),
Atmospheric Motion Vectors (AMV),
Infrared Sounders (IR),
Microwave Sounders (MW) and Microwave Radiometers (MWR),
LIDAR including Clound Bottom Height (CBH), Cloud Top Height (CTH), Backscatter Profiles, Line-of-Sight Winds (AEOLUS), Ceilometers,
RADAR including RADAR Radial Winds, RADAR Reflectivity and RADAR Dual Polarization,
GPS/GNSS including Radio Occultations (RO), Zenith Total Delay (ZTD), Slant Total Delay (STD),
Geostationary satellites and polar orbiting satellites
are used operationally, while a lot of research is going into the better use of
hyperspectral observations (many thousand frequencies per observed atmospheric column) in particular over land and in cloudy situations. The observation and reconstruction
of snow, ice, sea surface temperature, land surface temperature, coverage, emissivity and soil moisture is a very active area of research. Also, the observation and data assimilation of
clouds and convective processes with high-impact phenomena
such as thunderstorms, heavy rain and wind gusts with lead times from minutes to days is a special
focus of our research.
The research of our group at the University of Reading, UK, is concerned with
inverse problems and data assimilation in three areas:
numerical weather prediction (NWP),
cognitive neuroscience / neural field theory (NFT),
inverse scattering problems / remote sensing.
These are extremely exciting areas scientifically and very important for society,
for example for air traffic control, severe weather warnings and
national energy supply,
in medicine by medical imaging and for many
industrial and environmental questions.
Workshop and Seminar News
Oct 8-13, 2018, Berlin: Hans-Ertel Zentrum (HErZ) Conference 2018
Sept 3-7, 2018, St. Petersburg, Russia: COSMO General Meeting
May 14-20, 2018, Visit and Seminar Talk of Prof. Gen Nakamura, Sapporo, Japan, at DWD and our group
May 7-9, 2018, London, UK: Workshop on Particle Filter Methods at Imperial College, Invited Talk
April 27-28, 2018, Nanjing, China: NUIST Conference on Meteorology and Weather Prediction, Co-Chair
April 15-25, 2018, Shanghai, China: Invited Research Visit at Fudan University
Feb 26-28, 2018, DWD, Germany: COSMO User Seminar ICCARUS Web
Feb 7-8, 2018, Kobe, Japan: 8th AICS International Symposium, Invited Talk
Dec 19-23, 2017: Visit and Seminar Talk of Prof. Matthias Morzfeld, Arizona, at DWD and our group
Dec 11, 2017: Visit of Dr. Frank Beyrich and Team, Lindenberg Observatory, at out Group
Dec 4, 2017: Visit and Seminar Talk of Prof. Colin Cotter, Imperial College, at DWD and our group
Nov 15-16, 2017, Karlsruhe, Ger: Karlsruhe Institute of Technology (KIT) international review - DWD is associated partner for the ATMO programm on atmospherical sciences.
Nov 7-10, 2017, Kobe, Japan: External Reviewer of RIKEN Data Assimilation Unit Web
Nov 2-3, 2017: Visit and Seminar Talk of Prof. Dan Crisan, Imperial College, at DWD and our group
Due to the possible eruption of the volcano on Bali, the WMO meeting has been moved to Geneva:
Oct 23-24, 2017, Geneva, Switzerland: WMO
Commission of Atmospheric Sciences (CAS) Meeting Web CAS Docs
May 31-Jun 2, 2017, Jeju Island, Korea. “International Workshop on Real Time NWP Forecast System” with a strong Data Assimilation component https://www.kiaps.org/eng/main.do
, Invited Speaker
May 30-June 2, 2017, Colorado, USA: International Conference on Mathematical Neuroscience 2017 Web
May 23, 2017: Seminar Talk at the University of Karlsruhe, Ensemble Data Assimilation and Numerical Weather Prediction
April 19, 2017: Seminar Talk at Eumetsat, Darmstadt, about Satellite Data and Numerical Weather Prediction
March 28-30, 2017, Offenbach, Germany: HErZ General Meeting (Hans Ertel Center for Weather Research) General Structure PDF Open Talks
, Mentor for the data assimilation branch
March 27-29, 2017, Berlin, International conference on “Scaling Cascades in Complex Systems” by the Collaborative Research Center 1114
, Minisymposium on “balanced data assimilation”
For more news see IP News and
Previous News can be found at News RP 2016.
My group consists of about 30 researchers on data assimilation and inverse problems in Frankfurt/Offenbach and
Reading (UK), see group.
Jan 2017: Meetings DWD Data Assimilation Group with our partners from the
HErZ Center on Data Assimilation from LMU Munich.
My Christian Blog
Thinking about faith and life has always been a passion for me. I have become a Christian and have started to explore the world as someone who follows Jesus - that has turned out to be quite an adventure and highly exciting. In my daily blog I explore thoughts and arguments about faith, and monitor how faith works on a daily basis: Jesus Network
Recent publications can be found on publications. A book Inverse Modeling by Nakamura and Potthast with an introduction into data assimilation
and inverse problems has recently appeared at IOP.
Working in an operational center, our focus is to develop
state-of-the-art inversion methods which can be run in a reliable way on a supercomputer in near real-time. It includes
codes on scattering of waves, propagation of light and radiation, tomography, large-scale optimization and uncertainty
quanitfication, ensemble and particle methods.
(Our computer at Deutscher Wetterdienst is no 99 on the TOP-500 Supercomputer List Web)
However, the development of insight into the scientific problems we need to solve is an indispensible
ingredient of our daily work. Part of this insight is based on mathematical analysis and the testing of computational
methods for purpuse-built small-scale demonstration systems.
COST Action 1303 “TOPROF” Website;
Prof. Dr. Roland Potthast
Deutscher Wetterdienst (DWD)
Frankfurter Strasse 135
63067 Offenbach, Germany
Professor for Applied Mathematics
Department of Mathematics and Statistics,
Whiteknights, PO Box 220,
Reading RG6 6AX, UK