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| Titel |
Modelling of orographic precipitation over Iberia: a springtime case study |
| VerfasserIn |
M. J. Costa, R. Salgado, D. Santos, V. Levizzani, D. Bortoli, A. M. Silva, P. Pinto |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: Precipitation: Measurement, Climatology, Remote Sensing, and Modeling (EGU Session 2009) ; Nr. 25 (2010-05-07), S.103-110 |
| Datensatznummer |
250015744
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| Publikation (Nr.) |
 copernicus.org/adgeo-25-103-2010.pdf |
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| Zusammenfassung |
| Orographic precipitation is a result of very complex processes and its study
using numerical models is of utmost importance since it can open an
important avenue to the improvement of precipitation forecasts, especially
during the warm season. Mainland Portugal is characterised by a very
variable terrain between the north and south regions, the latter being much
smoother, with sparse mountains that barely reach 1000 m. Conversely,
several mountain ranges are distributed over Spain with heights often
exceeding 1500 m altitude. A mesoscale non-hydrostatic atmospheric model
(MesoNH) is used to study the orographic precipitation during a limited
period in spring of 2002 over the Iberian Peninsula. In order to assess the
effects of the mountains, case study simulations are done, with and without
the orography. MesoNH is initialized and forced by the ECMWF analyses. The
effects of orography on precipitation over neighbouring regions are also
analyzed. Simulations show that orography is a key factor in determining the
spatial distribution of precipitation over the Iberian Peninsula, with
enhancements in the regions with mountain ranges and diminution or
suppression over certain valleys. The simulated precipitation fields were
visually compared with radar observations in central Portugal and
quantitatively compared with rain gauge data all over Portugal in order to
assess the model performance in the analyzed cases. |
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