Understanding the influence of orography on the precipitation diurnal cycle and the associated atmospheric processes in the central Andes

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dc.contributor.authorJunquas, Clémentine
dc.contributor.authorTakahashi, Ken
dc.contributor.authorCondom, Thomas
dc.contributor.authorEspinoza, Jhan Carlo
dc.contributor.authorChávez Jara, Steven Paul
dc.contributor.authorSicart, J. E.
dc.contributor.authorLebel, Thierry
dc.coverage.spatialAndes centrales
dc.date.accessioned2018-08-06T15:04:27Z
dc.date.available2018-08-06T15:04:27Z
dc.date.issued2018-06
dc.description.abstractIn the tropical Andes, the identification of the present synoptic mechanisms associated with the diurnal cycle of precipitation and its interaction with orography is a key step to understand how the atmospheric circulation influences the patterns of precipitation variability on longer time-scales. In particular we aim to better understand the combination of the local and regional mechanisms controlling the diurnal cycle of summertime (DJF) precipitation in the Northern Central Andes (NCA) region of Southern Peru. A climatology of the diurnal cycle is obtained from 15 wet seasons (2000–2014) of 3-hourly TRMM-3B42 data (0.25° × 0.25°) and swath data from the TRMM-2A25 precipitation radar product (5 km × 5 km). The main findings are: (1) in the NCA region, the diurnal cycle shows a maximum precipitation occurring during the day (night) in the western (eastern) side of the Andes highlands, (2) in the valleys of the Cuzco region and in the Amazon slope of the Andes the maximum (minimum) precipitation occurs during the night (day). The WRF (Weather Research and Forecasting) regional atmospheric model is used to simulate the mean diurnal cycle in the NCA region for the same period at 27 km and 9 km horizontal grid spacing and 3-hourly output, and at 3 km only for the month of January 2010 in the Cuzco valleys. Sensitivity experiments were also performed to investigate the effect of the topography on the observed rainfall patterns. The model reproduces the main diurnal precipitation features. The main atmospheric processes identified are: (1) the presence of a regional-scale cyclonic circulation strengthening during the afternoon, (2) diurnal thermally driven circulations at local scale, including upslope (downslope) wind and moisture transport during the day (night), (3) channelization of the upslope moisture transport from the Amazon along the Apurimac valleys toward the western part of the cordillera.es_ES
dc.description.peer-reviewPor pareses_ES
dc.formatapplication/pdfes_ES
dc.identifier.citationJunquas, C., Takahashi, K., Condom, T., Espinoza, J.-C., Chávez, S., Sicart, J.-E., & Lebel, T. (2017). Understanding the influence of orography on the precipitation diurnal cycle and the associated atmospheric processes in the central Andes.==$Climate Dynamics, 50$==(11-12), 3995-4017. https://doi.org/10.1007/s00382-017-3858-8es_ES
dc.identifier.doihttps://doi.org/10.1007/s00382-017-3858-8es_ES
dc.identifier.govdocindex-oti2018
dc.identifier.journalClimate Dynamicses_ES
dc.identifier.urihttp://hdl.handle.net/20.500.12816/2259
dc.language.isoenges_ES
dc.publisherSpringeres_ES
dc.relation.ispartofurn:issn:0930-7575
dc.rightsinfo:eu-repo/semantics/restrictedAccesses_ES
dc.subjectPrecipitationes_ES
dc.subjectDiurnal cyclees_ES
dc.subjectCentral Andeses_ES
dc.subjectWRF modeles_ES
dc.subjectMoisture fluxes_ES
dc.subjectPerues_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.00es_ES
dc.subject.ocdehttp://purl.org/pe-repo/ocde/ford#1.05.09es_ES
dc.titleUnderstanding the influence of orography on the precipitation diurnal cycle and the associated atmospheric processes in the central Andeses_ES
dc.typeinfo:eu-repo/semantics/articlees_ES

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