The Influence of the Antarctic Oscillation (AAO) on Cold Waves and Occurrence of Frosts in the State of Santa Catarina, Brazil

Abstract

This paper examines the relationship between the Antarctic Oscillation (AAO), cold waves and occurrence of frosts in the state of Santa Catarina, Brazil, during the winter quarter. Research on this topic can assist different spheres of society, such as public health and agriculture, since cold waves can influence and/or aggravate health problems and frosts can inflict economic losses especially in the agricultural sector. For the purpose of this paper, cold wave is considered as the event in which the daily average surface air temperature was at least two standard deviations below the average value of the series on the day and for two consecutive days or more. The data on the average air temperature and frost occurrences are provided by the Company of Agricultural Research and Rural Extension of Santa Catarina/Center for Environmental Information and Hydrometeorology (EPAGRI/CIRAM). The AAO was subjected to statistical analysis using significance tests for the averages (Student's t-test) and variances (F-test) with a significance level of α = 5%. The results show that cold waves are unevenly distributed in the agroecological zones of Santa Catarina. It is found that the AAO is associated with the occurrence of frosts (in the agroecological zones represented by the municipalities of Itajaí and São José) in the state of Santa Catarina.

Ondas de calor nas capitais do Sul do Brasil e Montevidéu - Uruguai (Heat waves in the capitals of southern Brazil and Montevideo - Uruguay)

“…Este método foi desenvolvido por Vavrus et al (2006), originalmente, para identificar episódios de frio intenso durante a estação de inverno e, para tal, a fórmula se dá com sinais distintos: T méd ≤ ( Tcli -2 S ), também por dois dias consecutivos ou mais. Outros estudos utilizaram o mesmo método para verificar as ondas de frio (OdF) no sul do Brasil (e.g., Alves et al, 2017;. O desvio padrão, S , é dado pelo valor médio anual dos 366 (1º de janeiro a 31 de dezembro, considerando o dia 29 de fevereiro) desvios padrões diário.…”

Onda De Frio? Análise De Diferentes Métodos De Identificação

“…Outros utilizam tais métodos em aplicações específicas, por vezes, com adaptações (REBOITA et al, 2015;ALVES, 2016;SILVEIRA RB, 2016;ALVES et al, 2017) A porcentagem de falhas (ausência de dados) para Florianópolis não ultrapassou 0,15% para a Tmín, Tmáx e Tméd e, foi de 0,17% no período observado (2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010), dados utilizados de acordo com o método de Firpo et al (2012); diante de toda série histórica da Tmín desta estação as falhas ficaram abaixo de 1,5%. Para Chapecó a porcentagem de falhas foi de 1,99% na Tmín, 1,86% na Tmáx, 4,45% na Tméd e, 1,86% no período observado para o método de Firpo et al (2012); para toda série histórica da Tmín desta estação as falhas foram de 14,77%.…”

The climatology of cold and heat waves in Brazil from 1961 to 2016

“…(), and Alves et al . () found links between CWs or HWs in Brazil and El Niño, La Niña, and Antarctic Oscillation, from a global perspective of the climate phenomenon. Ceccherini et al .…”

“…In other words, the threshold temperature that characterizes a HW is in the 90th percentile, and that of a CW is in the 10th percentile. Rusticucci and Vargas (2001), Firpo et al (2012), Bitencourt et al (2016), and Alves et al (2017a) found links between CWs or HWs in Brazil and El Niño, La Niña, and Antarctic Oscillation, from a global perspective of the climate phenomenon. Ceccherini et al (2016) reported increased magnitude and more frequent HWs in South America, manly in the last 10 years, but no significant changes were found in CWs.…”