1. Diagnóstico de um Complexo Convectivo de Mesoescala Observado no Semiárido do Nordeste Brasileiro
- Author
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Vladimir Levit, Matheus José Arruda Lyra, Osmar Evandro Toledo Bonfim, and Natalia Fedorova
- Subjects
Atmospheric Science ,Intertropical Convergence Zone ,Geography, Planning and Development ,Northeast brazil ,Tropical rainfall ,Trade wind ,Mesoscale convective complex ,Geophysics ,Air temperature ,Environmental science ,Computers in Earth Sciences ,Geomorphology ,Earth-Surface Processes ,General Environmental Science - Abstract
Este estudo apresenta uma completa analise do ciclo de vida, da trajetoria e das condicoes sinoticas e termodinâmicas associadas a atuacao de um Complexo Convectivo de Mesoescala (CCM) observado no dia 02 de marco de 2015 sobre o semiarido brasileiro no Nordeste do Brasil (NEB). O CCM foi identificado atraves da analise das imagens do satelite GOES-13 nos canais infravermelho e vapor d’agua, com intervalos de 1 hora entre os dias 01 e 02 de Marco de 2015. Dados de reanalise II do National Centers for Environmental (NCEP) foram usados em conjunto com o software GrADS para a confeccao dos campos meteorologicos. Os dados de trovoada foram obtidos atraves do satelite Tropical Rainfall Measuring Mission (TRMM). O estudo termodinâmico foi baseado na analise dos perfis verticais de temperatura e umidade previstos com ate 48h de antecedencia. O CCM em estudo apresentou um ciclo de vida de 7 horas, englobando uma area de cerca de 110.000 km² ocasionando aumento na precipitacao e eventos de trovoadas para a regiao. A Zona de Convergencia Intertropical (ZCIT) se mostrou o principal sistema associado a formacao do CCM, alem da contribuicao dos ventos alisios de sudeste para o transporte de umidade vindo do Oceano Atlântico. As condicoes termodinâmicas da atmosfera para o dia do evento, como temperatura e umidade do ar, mostraram-se favoraveis ao desenvolvimento do CCM observado. A previsao foi realizada atraves das trajetorias das parcelas de ar utilizando o modelo HYSPLIT nos 10 niveis padroes. Os perfis previstos com 24 horas de antecedencia foram considerados satisfatorios. A B S T R A C T This study presents a complete analysis of the life cycle, trajectory, synoptycal and thermodynamic conditions associated with a Mesoscale Convective Complex (MCC). It was observed on 02 of March 2015 on semi-arid region in the Brazilian Northeast (BNE). GOES-13 satellite infrared (IR) and Water Vapor (WV) images were used in the MCC identification, with intervals of 1 hour from 01 to 02 of March 2015. Reanalysis data II of the National Center for Environmental (NCEP) were used together with the GrADS software for the construction of meteorological fields. Thunderstorm data were provided by the Tropical Rainfall Measuring Mission satellite (TRMM). Thermodynamic study was based on the analysis of the temperature and humidity vertical profiles provided for up to 48 hours antecedence. The MCC under study presented a life cycle of 7 hours, encompassing an area of about 110,000 km², causing an increase in precipitation and thunderstorm events for the region. The Intertropical Convergence Zone (ITCZ) was the main system associated with the formation of the MCC, in addition to the contribution of the southeast trade winds to the transport of moisture from the Atlantic Ocean. Thermodynamic conditions of the atmosphere for the event day, such as air temperature and humidity, were favorable to the development of the observed MCC. The prediction was performed through the air trajectories parcels using the HYSPLIT model in the 10 standard levels. Vertical profiles with 24 hours antecedence were considered satisfactory. Keywords: Precipitation, Synoptic Scales, Thermodynamic Conditions of the Atmosphere.
- Published
- 2018
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