Diurnal cycle in convergence patterns in the boundary layer east of the Andes and convection

The South American Low-Level Jet Experiment [SALLJEX] provided a unique dataset to investigate the existence of a mesoscale low-level circulation and of a diurnal cycle in its related convergence pattern over the Southeastern South American region east of the Andes, as well as its relationship with...

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Detalles Bibliográficos
Autor principal: Nicolini, María Gabriela
Otros Autores: García Skabar, Yanina
Formato: Artículo
Lenguaje:Inglés
Materias:
ANDES MOUNTAIN RANGE
BOUNDARY LAYER CONVERGENCE
INITIATION OF DEEP CONVECTION
LOW-LEVEL JET
MESOSCALE MOUNTAIN-PLAIN WIND REGIME
ARGENTINA
DATA SETS
DEEP CONVECTION
DIURNAL CYCLE
DIURNAL OSCILLATIONS
FIELD CAMPAIGN
FLOW REGIMES
FRONTAL ZONES
HIGH RESOLUTION ANALYSIS
HORIZONTAL ADVECTION
IN-PHASE
LOW DENSITY
LOW LEVEL
LOW LEVEL JET
MEAN DIVERGENCE
MESOSCALE
MESOSCALE CIRCULATION
MOUNTAIN RANGES
PARANA RIVER
SOUTHERN BRAZIL
SUBTROPICAL LATITUDES
SYNOPTIC CONDITIONS
WARM SEASONS
WIND SPEED
ZONAL WIND
BOUNDARY LAYERS
NATURAL CONVECTION
WIND
LANDFORMS
ATMOSPHERIC CIRCULATION
ATMOSPHERIC CONVECTION
ATMOSPHERIC FORCING
ATMOSPHERIC MOISTURE
DATA ASSIMILATION
DIURNAL VARIATION
JET
MESOSCALE MOTION
NOCTURNAL BOUNDARY LAYER
ANDES
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2011Nicolini.pdf
LINK AL EDITOR
Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central (FAUBA) de Universidad de Buenos Aires
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520 |a The South American Low-Level Jet Experiment [SALLJEX] provided a unique dataset to investigate the existence of a mesoscale low-level circulation and of a diurnal cycle in its related convergence pattern over the Southeastern South American region east of the Andes, as well as its relationship with deep convection during the warm season. The present paper builds upon high-resolution analyses produced, assimilating the data collected during the SALLJEX field campaign using BRAMS, and explores their capability to reproduce mesoscale circulations not resolved by the low density observational network available in this region. Results of the analyses show a diurnal oscillation signal in the mean boundary layer convergence pattern over the plains with a nocturnal [daytime] convergence [divergence] maximum. These results are coherent with previous findings of a nocturnal phase in the mature stage of organized deep convection and related precipitation in subtropical latitudes east of the Andes during the warm season. The diurnal cycle of convergence/divergence in the boundary layer is described over a 15-day period, during which different synoptic conditions occurred. During weakly forced environments a regime characterized by nocturnal eastward anomaly flow and convergence and daytime westward anomaly flow and divergence related to a mesoscale northwestern mountain-central plain flow regime dominates over the plains between the Andes Mountains, the Parana River Valley, and the southern Brazil mountain range. In contrast, during synoptic conditions dominated by the presence of a deep thermal low over northwestern Argentina and a related low-level jet, convergence at night is mainly accomplished by the predominantly meridional low-level jet, which exhibits an anomalous weak wind speed diurnal cycle with respect to its summer climatological mean. On the other hand daytime divergence is completely produced by the zonal wind component as in the previous synoptic situation. Mesoscale circulations are altered [still effecting mean divergence in the domain, which exhibits a diurnal oscillation] upon the initiation of deep convective circulations in the evening in an increasingly convectively unstable atmosphere driven by a persistent horizontal advection of heat and moisture at low levels and forced by convergence generated by the low-level jet and the presence of a frontal zone. Convection intensifies at night when its related convergence over the plains comes in phase with the convergence related to the nocturnal maximum in the low-level jet. 
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773 |t Atmospheric Research  |g Vol.100, no.4 (2011), p.377-390 
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900 |a ^aNicolini^bM. 
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900 |a ^aNicolini, M.^tCentro de Investigaciones del Mar y la Atmósfera, CONICET, Universidad de Buenos Aires, Pab. 2, 2 Piso, Ciudad Universitaria, C1428EGA, Ciudad Autónoma, Buenos Aires, Argentina 
900 |a ^aSkabar, Y.G.^tDepartamento de Ciencias de la Atmósfera y los Océanos, FCEyN, Universidad de Buenos Aires, Pab. 2, 2 Piso, Ciudad Universitaria, C1428EGA, Ciudad Autónoma, Buenos Aires, Argentina 
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900 |a MESOSCALE MOUNTAIN-PLAIN WIND REGIME 
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900 |a IN-PHASE 
900 |a INITIATION OF DEEP CONVECTION 
900 |a LOW DENSITY 
900 |a LOW LEVEL 
900 |a LOW LEVEL JET 
900 |a MEAN DIVERGENCE 
900 |a MESOSCALE 
900 |a MESOSCALE CIRCULATION 
900 |a MOUNTAIN RANGES 
900 |a PARANA RIVER 
900 |a SOUTHERN BRAZIL 
900 |a SUBTROPICAL LATITUDES 
900 |a SYNOPTIC CONDITIONS 
900 |a WARM SEASONS 
900 |a WIND SPEED 
900 |a ZONAL WIND 
900 |a BOUNDARY LAYERS 
900 |a NATURAL CONVECTION 
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900 |a LANDFORMS 
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900 |a ATMOSPHERIC FORCING 
900 |a ATMOSPHERIC MOISTURE 
900 |a DATA ASSIMILATION 
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900 |a The South American Low-Level Jet Experiment [SALLJEX] provided a unique dataset to investigate the existence of a mesoscale low-level circulation and of a diurnal cycle in its related convergence pattern over the Southeastern South American region east of the Andes, as well as its relationship with deep convection during the warm season. The present paper builds upon high-resolution analyses produced, assimilating the data collected during the SALLJEX field campaign using BRAMS, and explores their capability to reproduce mesoscale circulations not resolved by the low density observational network available in this region. Results of the analyses show a diurnal oscillation signal in the mean boundary layer convergence pattern over the plains with a nocturnal [daytime] convergence [divergence] maximum. These results are coherent with previous findings of a nocturnal phase in the mature stage of organized deep convection and related precipitation in subtropical latitudes east of the Andes during the warm season. The diurnal cycle of convergence/divergence in the boundary layer is described over a 15-day period, during which different synoptic conditions occurred. During weakly forced environments a regime characterized by nocturnal eastward anomaly flow and convergence and daytime westward anomaly flow and divergence related to a mesoscale northwestern mountain-central plain flow regime dominates over the plains between the Andes Mountains, the Parana River Valley, and the southern Brazil mountain range. In contrast, during synoptic conditions dominated by the presence of a deep thermal low over northwestern Argentina and a related low-level jet, convergence at night is mainly accomplished by the predominantly meridional low-level jet, which exhibits an anomalous weak wind speed diurnal cycle with respect to its summer climatological mean. On the other hand daytime divergence is completely produced by the zonal wind component as in the previous synoptic situation. Mesoscale circulations are altered [still effecting mean divergence in the domain, which exhibits a diurnal oscillation] upon the initiation of deep convective circulations in the evening in an increasingly convectively unstable atmosphere driven by a persistent horizontal advection of heat and moisture at low levels and forced by convergence generated by the low-level jet and the presence of a frontal zone. Convection intensifies at night when its related convergence over the plains comes in phase with the convergence related to the nocturnal maximum in the low-level jet. 
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