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| Titel |
Methods for automatized detection of rapid changes in lateral boundary condition fields for NWP limited area models |
| VerfasserIn |
M. Tudor |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 8, no. 8 ; Nr. 8, no. 8 (2015-08-24), S.2627-2643 |
| Datensatznummer |
250116510
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| Publikation (Nr.) |
 copernicus.org/gmd-8-2627-2015.pdf |
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| Zusammenfassung |
| Three-hourly temporal resolution of lateral boundary data for limited area
models (LAMs) can be too infrequent to resolve rapidly moving storms. This
problem is expected to be worse with increasing horizontal resolution. In
order to detect intensive disturbances in surface pressure moving rapidly
through the model domain, a filtered surface pressure field (MCUF) is
computed operationally in the ARPEGE global model of Météo France.
The field is distributed in the coupling files along with conventional
meteorological fields used for lateral boundary conditions (LBCs) for the
operational forecast using limited area model ALADIN (Aire Limitée
Adaptation dynamique Développement InterNational) in the Meteorological
and Hydrological Service of Croatia (DHMZ). Here an analysis is performed of
the MCUF field for the LACE coupling domain for the period from
23 January 2006, when it became available, until 15 November 2014. The MCUF
field is a good indicator of rapidly moving pressure disturbances (RMPDs).
Its spatial and temporal distribution can be associated with the usual
cyclone tracks and areas known to be supporting cyclogenesis. An alternative
set of coupling files from the IFS operational run in the European Centre for
Medium-Range Weather Forecasts (ECMWF) is also available operationally in
DHMZ with 3-hourly temporal resolution, but the MCUF field is not available.
Here, several methods are tested that detect RMPDs in surface pressure a
posteriori from the IFS model fields provided in the coupling files. MCUF is
computed by running ALADIN on the coupling files from IFS. The error function
is computed using one-time-step integration of ALADIN on the coupling files
without initialization, initialized with digital filter initialization (DFI)
or scale-selective DFI (SSDFI). Finally, the amplitude of changes in the mean
sea level pressure is computed from the fields in the coupling files. The
results are compared to the MCUF field of ARPEGE and the results of same
methods applied to the coupling files from ARPEGE. Most methods give a signal
for the RMPDs, but DFI reduces the storms too much to be detected. The error
functions without filtering and amplitude have more noise, but the signal of
a RMPD is also stronger. The methods are tested for NWP LAM ALADIN, but could
be applied to other LAMs and benefit the performance of climate LAMs. |
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