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| Titel |
South America Low-Level Jet and its effects on the precipitation over La Plata Basin |
| VerfasserIn |
Marta Llopart, Erika Coppola, Filippo Giorgi |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250101957
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| Publikation (Nr.) |
 EGU/EGU2015-1226.pdf |
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| Zusammenfassung |
| Studies with climate models have shown a dry bias in precipitation over La
Plata Basin region for both regional and global models, which suggests a
common deficiency in simulating the precipitation of the region. These
deficiencies could be tied with the models parameterizations, which are
not able to capture the dynamical systems as for example the low level
jet, resulting in a weak latitudinal and meridional moisture transport.
The goal of this work was to analyze the simulated South America low level
jet and its impacts on the precipitation over La Plata Basin using
different model parameterizations. In this work we used the Regional
Climate Model (RegCM4) over CORDEX South America Domain. The model results
were compared against Era-Interim analysis and CRU data. The results show
that the low level jet representation is tied to both the precipitation
convection scheme and the land-surface scheme. Several combinations of
both convection and land-surface scheme have been tested and this can
result in a weaker or stronger representation of the jet.
The optimal configuration has been obtained and the physical explanation
is presented.
The jet position and strength is clearly influencing the precipitation
spatial distribution and intensity over La Plata basin and by modeling the
correct position and intensity the jet the dry bias over this basin is
reduced. |
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