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4. LFRic: Meeting the challenges of scalability and performance portability in Weather and Climate models

Author

Adams, S. V., Ford, R. W., Hambley, M., Hobson, J. M., Kavcic, I., Maynard, C. M., Melvin, T., Mueller, E. H, Mullerworth, S., Porter, A. R., Rezny, M., Shipway, B. J., and Wong, R.

Subjects
Computer Science - Distributed, Parallel, and Cluster Computing
Abstract

This paper describes LFRic: the new weather and climate modelling system being developed by the UK Met Office to replace the existing Unified Model in preparation for exascale computing in the 2020s. LFRic uses the GungHo dynamical core and runs on a semi-structured cubed-sphere mesh. The design of the supporting infrastructure follows object orientated principles to facilitate modularity and the use of external libraries where possible. In particular, a `separation of concerns' between the science code and parallel code is imposed to promote performance portability. An application called PSyclone, developed at the STFC Hartree centre, can generate the parallel code enabling deployment of a single source science code onto different machine architectures. This paper provides an overview of the scientific requirement, the design of the software infrastructure, and examples of PSyclone usage. Preliminary performance results show strong scaling and an indication that hybrid MPI/OpenMP performs better than pure MPI., Comment: 41 pages, 10 figures. EASC2018

Published
2018
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34. Ceramic and Pottery Workers

Author

Smith, H., English, John S. C., Hobson, J., John, Swen Malte, editor, Johansen, Jeanne Duus, editor, Rustemeyer, Thomas, editor, Elsner, Peter, editor, and Maibach, Howard I., editor

Published
2020
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43. Risk-benefit considerations in evaluating commensal anticoagulant rodenticide impacts to wildlife

Author

Kaukeinen, D. E., Spragins, C. W., and Hobson, J. F.

Subjects
anticoagulant, rodenticide, brodifacoum, bromadiolone, chlorophacinone, diphacinone, non-target hazard, risk-benefit, pesticide residue, commensal rodent, Norway rat, house mouse, roof rat, Rattus norvegicus, Rattus rattus, Mus musculus
Abstract

Evaluation of the possible impacts of rodenticides on wildlife must be conducted in the context of risk-benefit considerations. Harmful introduced pests (e.g., commensal rats and mice) historically have required management around human habitation for economic and public health reasons. Disparate views of limited data have accumulated concerning the wildlife impacts resulting from commensal rodent control activities. The founding of the Rodenticide Registrants Task Force (RRTF), a trade association that includes all the major manufacturers and importers of anticoagulant rodenticide products (and bromethalin, a non-anticoagulant rodenticide) in the U.S., is described. The potential for anticoagulant dispersion in wildlife via primary and secondary routes is considered. Toxicology and pharmacokinetic studies are analyzed to obtain a better understanding of the biological and toxicological significance of low levels of rodenticide in animal tissue. A framework to address rodenticide impact to wildlife is presented. It is based upon the example of long-term cooperative efforts in England involving government, environmental, and manufacturer groups.

Published
2000

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