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Journal article

Single-precision in the tangent-linear and adjoint models of incremental 4D-VAr

Abstract:

The use of single-precision arithmetic in ECMWF’s forecasting model gave a 40% reduction in wall-clock time over double-precision, with no decrease in forecast quality. However, using reduced-precision in 4D-Var data assimilation is relatively unexplored and there are potential issues with using single-precision in the tangent-linear and adjoint models. Here, we present the results of reducing numerical precision in an incremental 4D-Var data assimilation scheme, with an underlying two-layer ...

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Publication status:
Published
Peer review status:
Peer reviewed

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Publisher copy:
10.1175/MWR-D-19-0291.1

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Department:
PHYSICS
Subgroup:
Atmos Ocean & Planet Physics
Role:
Author
ORCID:
0000-0002-7121-2196
Publisher:
American Meteorological Society Publisher's website
Journal:
Monthly Weather Review Journal website
Volume:
148
Issue:
4
Pages:
1541-1552
Publication date:
2020-03-26
Acceptance date:
2019-12-17
DOI:
EISSN:
1520-0493
ISSN:
0027-0644
Pubs id:
1109958
Local pid:
pubs:1109958

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