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| Titel |
Improved simulation of precipitation in the tropics using a modified BMJ scheme in the WRF model |
| VerfasserIn |
R. M. Fonseca, T. Zhang, K.-T. Yong |
| 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. 9 ; Nr. 8, no. 9 (2015-09-22), S.2915-2928 |
| Datensatznummer |
250116560
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| Publikation (Nr.) |
 copernicus.org/gmd-8-2915-2015.pdf |
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| Zusammenfassung |
| The successful modelling of the observed precipitation, a very important
variable for a wide range of climate applications, continues to be one of
the major challenges that climate scientists face today. When the Weather
Research and Forecasting (WRF) model is used to dynamically downscale the
Climate Forecast System Reanalysis (CFSR) over the Indo-Pacific region, with
analysis (grid-point) nudging, it is found that the cumulus scheme used,
Betts–Miller–Janjić (BMJ), produces excessive rainfall suggesting that
it has to be modified for this region. Experimentation has shown that the
cumulus precipitation is not very sensitive to changes in the cloud
efficiency but varies greatly in response to modifications of the
temperature and humidity reference profiles. A new version of the scheme,
denoted "modified BMJ" scheme, where the humidity reference profile is
more moist, was developed. In tropical belt simulations it was found to give
a better estimate of the observed precipitation as given by the Tropical
Rainfall Measuring Mission (TRMM) 3B42 data set than the default BMJ scheme
for the whole tropics and both monsoon seasons. In fact, in some regions the
model even outperforms CFSR. The advantage of modifying the BMJ scheme to
produce better rainfall estimates lies in the final dynamical consistency of
the rainfall with other dynamical and thermodynamical variables of the
atmosphere. |
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