Some mean atmospheric characteristics for snowfall occurrences in southern Brazil

Mintegui, Jéssica Melo; Puhales, Franciano Scremin; Boiaski, Nathalie Tissot; Nascimento, Ernani de Lima; Anabor, Vagner

doi:10.1007/s00703-018-0578-5

Cited by 5 publications

(4 citation statements)

References 19 publications

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“…A high number of snowfall days (11) were observed in southern Brazil (Mintegui et al, 2018) and several of the coldest air intrusions in the twenty-first century were documented (Lanfredi and de Camargo, 2018).…”

Section: Discussionmentioning

confidence: 99%

Synoptic and Mesoscale atmospheric features associated with an extreme Snowstorm over the Central Andes in August 2013

Zamuriano

Froidevaux

Moreno³

et al. 2019

Preprint

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Abstract. We study the synoptic and mesoscale characteristics of a snowfall event over the Bolivian Altiplano in August 2013 that caused severe damage to people, infrastructure and livestock. This event was associated with a cold front episode following the eastern slope of the Andes-Amazon interface and a cut-off low pressure system (COL) over the Pacific Ocean. Large scale analyses suggest a two-stage mechanism: The first phase consisted of a strong cold surge to the east of the Andes inducing low level blocking of southward moisture transport over the SW Amazon basin due to post-frontal high-pressure up to 500 hPa synchronized to a Rossby wave train. The second stage was initiated by the displacement of 500 hPa anticyclone over the Andes due to a Rossby wave passage and a subsequent increase in north-easterly moisture transport, while another cold front along the eastern Andes provided additional lifting. We analyse an analog event (July 2010) to confirm the influence of these large-scale features on snow formation. We conduct a mesoscale analysis using the Weather Research and Forecasting (WRF-ARW) model. For this purpose, we perform a series of high-resolution numerical experiments that include sensitivity studies where we apply orographic and lake Titicaca temperature modifications. We compare our findings to MODIS snow cover estimates and in-situ measurements. The control simulation is able to capture the snow cover spatial distribution and sheds light over several aspects of the snowfall dynamics. In our WRF simulations, daytime snowfall mainly occurs around complex orography whereas nocturnal snowfall is concentrated over the plateau due to a combination of nocturnal winds and complex orography inside the plateau. The sensitivity experiments indicate the importance of the lake and mountain for thermal wind circulation affecting the spatial distribution of snowfall by shifting the position of the convergence zones. The influence of the lake's thermal effect is not evident around the regions surrounding the lake.

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Section: Discussionmentioning

confidence: 99%

Synoptic and Mesoscale atmospheric features associated with an extreme Snowstorm over the Central Andes in August 2013

Zamuriano

Froidevaux

Moreno³

et al. 2019

Preprint

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“…The southern region of Brazil, which includes the states of RS, Santa Catarina and Paraná (Figure 1a), is characterized by cold air incursions in wintertime (e.g., Garreaud (1999, 2000); Vera and Vigliarolo (2000)), which sometimes produce frosts (e.g., Müller and Berri (2007, 2012)) and snowfall (Mintegui et al, 2019). On the other hand, such a region is characterized by hot summer periods.…”

Section: Methodsmentioning

confidence: 99%

Winter heat waves characteristics associated with downslope windstorm in south Brazil

Rosa

Stefanello

Reis

et al. 2023

Intl Journal of Climatology

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The air temperature anomaly was analysed in 16 consecutive winters from 2004 to 2019 in southern Brazil using reanalysis data and hourly atmospheric observations. In this study, 13 heat wave (HW) episodes were identified using the percentile methodology. All identified episodes are associated with the occurrence of a downslope windstorm known as Vento Norte (VNOR; Portuguese for ‘North Wind’). The VNOR is characterized by a sharp increase in air temperature combined with constant, strong, gusty winds from the north and a drop in relative humidity. The average duration was about 5 days for HW and 18 h for VNOR being than in 59.5% of the HW hours, the VNOR windstorm was also detected. The main atmospheric variables were compared during the periods of winter, HW and the VNOR windstorm. The analysis showed that HW alters local weather and climate conditions, with the more pronounced features associated with the VNOR flow. A more detailed investigation comparing the atmospheric variables collected north and south of an abrupt change in terrain altitude (400 m) revealed that the main cause of the amplification of the atmospheric variable anomalies in the centre of the state of Rio Grande do Sul was the simultaneous occurrence of HW and VNOR.

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“…Segundo a AMERICAN METEOROLOGICAL SOCIETY (2016), neve é uma forma de precipitação composta de cristais de gelo brancos ou translúcidos, principalmente em forma hexagonal muitas vezes aglomerada em flocos de neve. O estado de Santa Catarina é conhecido pelas temperaturas baixas e precipitação de neve no período de abril à setembro Mintegui et al (2018). Desde os anos 60, segundo a defesa civil deste estado DEFESA CIVIL DE SANTA CATARINA (2013), apenas seis anos não registraram o fênomeno, o que mostra que a precipitação de neve é um fenômeno recorrente nessa região.…”

Section: Introductionunclassified

“…Desde os anos 60, segundo a defesa civil deste estado DEFESA CIVIL DE SANTA CATARINA (2013), apenas seis anos não registraram o fênomeno, o que mostra que a precipitação de neve é um fenômeno recorrente nessa região. Mintegui et al (2018) mostrou que há a precipítação de neve na região sul está associada a sistemas transientes de alta e baixa pressão, associados a um padrão de onda bem definido em todos níveis de pressão analisados. Além de um dipólo anômalo negativo que favorece o escoamento, que contribui para entrada de ar frio marítimo ocasionando a ocorrência do fenômeno.…”

Section: Introductionunclassified

Análise da taxa de queda de temperatura antes e durante eventos de neve em Santa Catarina

Mintegui

Puhales

Peliçário

2018

CeN

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In this work the average behavior of minimum and maximum temperatures for the state of Santa Catarina, before and during snowfall events, from 1979 to 2015, was analysed. To accomplish this study, have been employed minima and maxima temperature data from conventional meteorological stations which were provided by the Centro de Informações de Recursos Ambientais eHidrológicos de Santa Catarina (Ciram), linked to the Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina (Epagri). In general, a sharp decreses in temperatures from day D - 1 (the day before the snow event) to day D + 0 (day of snowfall) is observed.

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Some mean atmospheric characteristics for snowfall occurrences in southern Brazil

Cited by 5 publications

References 19 publications

Synoptic and Mesoscale atmospheric features associated with an extreme Snowstorm over the Central Andes in August 2013

Synoptic and Mesoscale atmospheric features associated with an extreme Snowstorm over the Central Andes in August 2013

Winter heat waves characteristics associated with downslope windstorm in south Brazil

Análise da taxa de queda de temperatura antes e durante eventos de neve em Santa Catarina

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