A scalable dynamical core for Next Generation Weather and Climate Prediction - Phase 2
Lead Research Organisation:
University of Reading
Department Name: Meteorology
People |
ORCID iD |
| Hilary Weller (Principal Investigator) |
Publications
Weller H
(2014)
Curl-Free Pressure Gradients over Orography in a Solution of the Fully Compressible Euler Equations with Implicit Treatment of Acoustic and Gravity Waves
in Monthly Weather Review
Weller H
(2014)
Non-orthogonal version of the arbitrary polygonal C-grid and a new diamond grid
in Geoscientific Model Development
Weller H
(2016)
Comparison of Terrain-Following and Cut-Cell Grids Using a Nonhydrostatic Model
in Monthly Weather Review
Shaw J
(2017)
Multidimensional method-of-lines transport for atmospheric flows over steep terrain using arbitrary meshes
in Journal of Computational Physics
Chen Y
(2017)
Comparison of dimensionally split and multi-dimensional atmospheric transport schemes for long time steps
in Quarterly Journal of the Royal Meteorological Society
| Description | I have been developing numerical methods for transporting pollutants and other atmospheric constituents that are stable and accurate even when a large time-step are used and even on quasi-uniform grids of the sphere. The Met Office is moving a way from the highly non-uniform latitude-longitude grid to a quasi-uniform grid such as the cubed sphere. Therefore it is not possible to use the same kind of transport scheme. The question is, should we use a one-dimensional scheme applied in every direction separately or a multi-dimensional scheme that does not rely on grid points being aligned in particular directions. With an MSc student, we have developed a new transport scheme that does not rely on grid alignment. However we have found that the classic schemes that do rely on grid alignment, perform extremely well even when grids are not aligned. We have also compared the accuracy of different techniques for taking long, stable time-steps. Implicit time-stepping is usually thought to suffer from large errors when using large time-steps while semi-Lagrangian schemes are thought to be more accurate. In contrast, we have found that the more Lagrangian type of transport scheme is unstable when long time-steps are taken on distorted grids while the implicit time-stepping retains stability. |
| Exploitation Route | Continued discussions with the Met Office and with ECMWF |
| Sectors | Aerospace, Defence and Marine,Environment |
| URL | https://arxiv.org/abs/1701.06907 |
| Description | Options for the next Met Office prediction model were analysed. Several originally promising methods were eliminated and some new methods were explored. |
| First Year Of Impact | 2014 |
| Sector | Aerospace, Defence and Marine |
| Impact Types | Policy & public services |
| Description | Transport scheme in next generation Met Office model |
| Geographic Reach | National |
| Policy Influence Type | Participation in a guidance/advisory committee |
| URL | https://arxiv.org/abs/1701.06907 |
| Title | AtmosFOAM |
| Description | A suite of numerical models and methods for atmospheric modelling using emerging numerical techniques |
| Type Of Material | Computer model/algorithm |
| Year Produced | 2014 |
| Provided To Others? | Yes |
| Impact | Papers and collaborative code development with students |
| URL | https://github.com/AtmosFOAM/ |
| Description | Long time step transport with ECMWF |
| Organisation | European Centre for Medium Range Weather Forecasting ECMWF |
| Country | United Kingdom |
| Sector | Public |
| PI Contribution | Developing transport schemes for atmospheric modelling that are conservative and stable for long time steps. |
| Collaborator Contribution | Advising on requirements and current capabilities. |
| Impact | No |
| Start Year | 2019 |
| Description | MSc project on transport schemes with the Met Office |
| Organisation | Meteorological Office UK |
| Country | United Kingdom |
| Sector | Academic/University |
| PI Contribution | Tested various transport schemes which could be suitable for the next Met Office forecasting model. |
| Collaborator Contribution | Met Office staff jointly supervised an MSc dissertation on numerical methods suitable for the next Met Office forecasting model. |
| Impact | Publication submitted: https://arxiv.org/abs/1701.06907 |
| Start Year | 2015 |
| Title | AtmosFOAM |
| Description | A set of library routines and applications for simulating the atmosphere using arbitrary meshes |
| Type Of Technology | Software |
| Year Produced | 2015 |
| Open Source License? | Yes |
| Impact | This is a research tool and has enabled the research for all of my publications. |
| URL | https://github.com/AtmosFOAM |
| Description | Dynamical Core Model Intercomparison Project (DCMIP) |
| Form Of Engagement Activity | Participation in an activity, workshop or similar |
| Part Of Official Scheme? | No |
| Geographic Reach | International |
| Primary Audience | Professional Practitioners |
| Results and Impact | Series of lectures at the Dynamical Core Model Intercomparison Project workshop in order to train post-graduates and weather forecast model developers in the latest modelling techniques. |
| Year(s) Of Engagement Activity | 2016 |
| URL | https://www.earthsystemcog.org/projects/dcmip-2016/ |
| Description | Plenary talk at SIAM student chapter |
| Form Of Engagement Activity | A talk or presentation |
| Part Of Official Scheme? | No |
| Geographic Reach | National |
| Primary Audience | Postgraduate students |
| Results and Impact | The talk on "New mathematical techniques for weather and climate prediction" sparked questions and interest from the students and informed students about the mathematical challenges of weather and climate prediction none |
| Year(s) Of Engagement Activity | 2014 |
| URL | http://www.reading.ac.uk/maths/siamstudentchapter/conference.html |