Numerical modelling of heavy precipitation events over Eastern Pyrenees: Analysis of orographic effects
Identifieur interne : 001709 ( Main/Exploration ); précédent : 001708; suivant : 001710Numerical modelling of heavy precipitation events over Eastern Pyrenees: Analysis of orographic effects
Auteurs : L. Trapero [Andorre] ; J. Bech [Espagne] ; J. Lorente [Espagne]Source :
- Atmospheric research [ 0169-8095 ] ; 2013.
Descripteurs français
- Pascal (Inist)
English descriptors
Abstract
This study examines the effect of the orography on two heavy precipitation events (HPE1 and HPE2) which exceeded 100 mm in 24 h and affected the Eastern Pyrenees (Andorra, NE Spain and SE France) in the NW Mediterranean. High resolution simulations (3 km) performed with the Weather and Research Forecasting model (WRF) were compared with precipitation, observations to assess the ability of the model to reproduce the spatial distribution of the rainfall field in this mountainous area and determine the prominent factors of intense precipitation occurrence. The analysis has been focused on the association of the heavy rainfall to the existing atmospheric disturbance and the presence of orographic induced vertical motions. For both episodes at 3 km resolution, on exposed mountain sides, vertical moisture fluxes characterized with the orographic moisture flux index (OMF) yielded values above 7 g kg-1 m s-1, consistent with previous studies. The spatial distribution of the OMF maximum is in agreement with the observed rainfall maxima over the Eastern Pyrenees according to the combination of two factors, namely the normal orientation of mountain range with respect to the prevailing moisture flows and large wind speeds of the impinging upstream flows (∼20 m/s). Moreover, the analyses of a triggering term and moist Froude number also reflect the complexity of applying theoretical results obtained in idealized simulations with 2D mountain ridges to numerical simulations with dynamic evolving conditions over areas with complex orography as the Eastern Pyrenees.
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Bech</name><affiliation wicri:level="2"><inist:fA14 i1="02"><s1>University of Barcelona (UB), Department of Astronomy and Meteorology, C/Marti i Franques 1</s1><s2>08028 Barcelona</s2><s3>ESP</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Espagne</country><placeName><region nuts="2" type="communauté">Catalogne</region></placeName></affiliation></author><author><name sortKey="Lorente, J" sort="Lorente, J" uniqKey="Lorente J" first="J." last="Lorente">J. Lorente</name><affiliation wicri:level="2"><inist:fA14 i1="02"><s1>University of Barcelona (UB), Department of Astronomy and Meteorology, C/Marti i Franques 1</s1><s2>08028 Barcelona</s2><s3>ESP</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Espagne</country><placeName><region nuts="2" type="communauté">Catalogne</region></placeName></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">13-0334190</idno><date when="2013">2013</date><idno type="stanalyst">PASCAL 13-0334190 INIST</idno><idno type="RBID">Pascal:13-0334190</idno><idno type="wicri:Area/PascalFrancis/Corpus">000054</idno><idno type="wicri:Area/PascalFrancis/Curation">000953</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000055</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">000055</idno><idno type="wicri:doubleKey">0169-8095:2013:Trapero L:numerical:modelling:of</idno><idno type="wicri:Area/Main/Merge">001726</idno><idno type="wicri:Area/Main/Curation">001709</idno><idno type="wicri:Area/Main/Exploration">001709</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Numerical modelling of heavy precipitation events over Eastern Pyrenees: Analysis of orographic effects</title><author><name sortKey="Trapero, L" sort="Trapero, L" uniqKey="Trapero L" first="L." last="Trapero">L. Trapero</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Snow and Mountain Research Centre of Andorra, Institut d'Estudis Andorrans (CENMA-IEA), Av. Rocafort 21-23, Edifici Moli, Sant Julià de Lòria AD600</s1><s3>AND</s3><sZ>1 aut.</sZ></inist:fA14><country>Andorre</country><wicri:noRegion>Snow and Mountain Research Centre of Andorra, Institut d'Estudis Andorrans (CENMA-IEA), Av. Rocafort 21-23, Edifici Moli, Sant Julià de Lòria AD600</wicri:noRegion></affiliation></author><author><name sortKey="Bech, J" sort="Bech, J" uniqKey="Bech J" first="J." last="Bech">J. Bech</name><affiliation wicri:level="2"><inist:fA14 i1="02"><s1>University of Barcelona (UB), Department of Astronomy and Meteorology, C/Marti i Franques 1</s1><s2>08028 Barcelona</s2><s3>ESP</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Espagne</country><placeName><region nuts="2" type="communauté">Catalogne</region></placeName></affiliation></author><author><name sortKey="Lorente, J" sort="Lorente, J" uniqKey="Lorente J" first="J." last="Lorente">J. Lorente</name><affiliation wicri:level="2"><inist:fA14 i1="02"><s1>University of Barcelona (UB), Department of Astronomy and Meteorology, C/Marti i Franques 1</s1><s2>08028 Barcelona</s2><s3>ESP</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Espagne</country><placeName><region nuts="2" type="communauté">Catalogne</region></placeName></affiliation></author></analytic><series><title level="j" type="main">Atmospheric research</title><title level="j" type="abbreviated">Atmos. res.</title><idno type="ISSN">0169-8095</idno><imprint><date when="2013">2013</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Atmospheric research</title><title level="j" type="abbreviated">Atmos. res.</title><idno type="ISSN">0169-8095</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Orography</term><term>Pyrenees</term><term>atmospheric precipitation</term><term>high resolution</term><term>mountains</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Précipitation atmosphérique</term><term>Orographie</term><term>Massif montagneux</term><term>Haute résolution</term><term>Pyrénées</term><term>Modèle WRF</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">This study examines the effect of the orography on two heavy precipitation events (HPE1 and HPE2) which exceeded 100 mm in 24 h and affected the Eastern Pyrenees (Andorra, NE Spain and SE France) in the NW Mediterranean. High resolution simulations (3 km) performed with the Weather and Research Forecasting model (WRF) were compared with precipitation, observations to assess the ability of the model to reproduce the spatial distribution of the rainfall field in this mountainous area and determine the prominent factors of intense precipitation occurrence. The analysis has been focused on the association of the heavy rainfall to the existing atmospheric disturbance and the presence of orographic induced vertical motions. For both episodes at 3 km resolution, on exposed mountain sides, vertical moisture fluxes characterized with the orographic moisture flux index (OMF) yielded values above 7 g kg<sup>-1</sup> m s<sup>-1</sup>, consistent with previous studies. The spatial distribution of the OMF maximum is in agreement with the observed rainfall maxima over the Eastern Pyrenees according to the combination of two factors, namely the normal orientation of mountain range with respect to the prevailing moisture flows and large wind speeds of the impinging upstream flows (∼20 m/s). Moreover, the analyses of a triggering term and moist Froude number also reflect the complexity of applying theoretical results obtained in idealized simulations with 2D mountain ridges to numerical simulations with dynamic evolving conditions over areas with complex orography as the Eastern Pyrenees.</div></front></TEI><affiliations><list><country><li>Andorre</li><li>Espagne</li></country><region><li>Catalogne</li></region></list><tree><country name="Andorre"><noRegion><name sortKey="Trapero, L" sort="Trapero, L" uniqKey="Trapero L" first="L." last="Trapero">L. Trapero</name></noRegion></country><country name="Espagne"><region name="Catalogne"><name sortKey="Bech, J" sort="Bech, J" uniqKey="Bech J" first="J." last="Bech">J. Bech</name></region><name sortKey="Lorente, J" sort="Lorente, J" uniqKey="Lorente J" first="J." last="Lorente">J. Lorente</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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