Synoptic forcing associated with extreme precipitation events over Southeastern South America as depicted by a CORDEX FPS set of convection-permitting RCMs
| Autor: | Alvaro Lavin-Gullon, Jesús Fernández, R. P. da Rocha, Maria Laura Bettolli, Silvina Alicia Solman, M. Feijoo |
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| Přispěvatelé: | Ministerio de Economía y Competitividad (España), European Commission, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Brasil) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Convection
Atmospheric Science 010504 meteorology & atmospheric sciences Atmospheric circulation Magnitude (mathematics) Forcing (mathematics) 010502 geochemistry & geophysics Spatial distribution 01 natural sciences Climatology Spatial ecology Environmental science Climate model Precipitation Physics::Atmospheric and Oceanic Physics 0105 earth and related environmental sciences |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname |
| Popis: | Southeastern South America (SESA) stands out as a remarkable region of occurrence of deep convection. This is mainly due to the proximity of the Andes, which eventually determine their magnitude and intensity. In this work, we used a set of convection-permitting (4 km horizontal resolution) regional climate models to explore their ability to reproduce the synoptic forcings that trigger deep convection over La Plata basin. The study considered simulating three extreme convective precipitation events in two different timescales. On one hand, a short-term simulation initiated a few hours before the onset of each event, spanning 3–4 days. On the other hand, as regional climate modelling, a 6-month simulation that includes the three selected events. In contrast to parameterized convection, the convection-permitting resolutions not only intensified the events, but also modified the location of the maximum precipitation by modulating the low-level atmospheric circulation. Vertically integrated moisture flux convergence emerged as a noticeable footprint of deep moist convection, regardless of the model and timescale. The performance of the models in reproducing the observed precipitation was also quantitatively analyzed. The skill depends on the spatial scale. The results were case-dependent in the short-term simulations. However, an analysis over multiple events in the long-term simulations revealed that, in general, convection-permitting resolutions better capture the spatial distribution of the extreme precipitation in SESA. The study comprises the first multi-model ensemble of convection-permitting simulations over the region, a seed for a further analysis with a more complete ensemble to better understand the results presented here. AL-G acknowledges the support by the Spanish government through Grant BES-2016-078158 and MINECO/FEDER co-funded project MULTI-SDM (CGL2015-66583-R). JF acknowledges support by the Spanish government through the MINECO/FEDER co-funded project INSIGNIA (CGL2016-79210-R). UCAN simulations have been carried out on the Altamira Supercomputer at the Instituto de Física de Cantabria (IFCA-CSIC), member of the Spanish Supercomputing Network. This work has been partially supported by UBACYT2018 Grant 20020170100117BA and CNPq-Brazil Grant 304949/2018-3. |
| Databáze: | OpenAIRE |
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