Relations of South American summer rainfall interannual variations with the Pacific Decadal Oscillation

Kayano, Mary Toshie; Andreoli, Rita V.

doi:10.1002/joc.1417

Cited by 126 publications

(103 citation statements)

References 57 publications

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“…They found that El Niño signals in South American rainfall are more conspicuous for the warm PDO regime than for the cold PDO regime. Kayano and Andreoli (2007) suggested that the PDO creates a background for the ENSO teleconnections for the South American rainfall, acting to enhance (weaken) the rainfall anomalies when these phenomena are in the same (opposite) phase.…”

Section: Introductionmentioning

confidence: 99%

Interannual relations between South American rainfall and tropical sea surface temperature anomalies before and after 1976

Kayano¹,

Oliveira²,

Andreoli³

2008

Intl Journal of Climatology

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ABSTRACT:The differences between 1948-1976 and 1977-2002 periods in the interannual relationships of South American precipitation with sea surface temperature (SST) indices in selected oceanic sectors are documented using correlation analyses. For the total correlation between the eastern equatorial Pacific (EEP) and tropical South Atlantic (TSA) indices and the precipitation, the differences between the two periods reflect, in part, the El Niño-Southern Oscillation (ENSO) teleconnections over South America, with the Pacific decadal oscillation (PDO) background acting to enhance (weaken) the correlations when ENSO and PDO are in the same (opposite) phase. For the total correlation between the tropical North Atlantic (TNA) and southwest South Atlantic (SWA) indices and precipitation, the results here suggest that the differences between the two periods might be reflected as variations in the Bolivian high-pressure system. Both the TNA and TSA indices may act to weaken the positive ENSO relations with precipitation over central and eastern Brazil during the cold PDO phase. These analyses provide indications that the ENSO relationship with the TSA shows differences between the two analysed periods.

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Section: Introductionmentioning

confidence: 99%

Interannual relations between South American rainfall and tropical sea surface temperature anomalies before and after 1976

Kayano¹,

Oliveira²,

Andreoli³

2008

Intl Journal of Climatology

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“…Ou seja, nessas décadas do século 20, quando a ODP estava na fase fria, as mínimas e máximas anuais da temperatura mínima do ar tiveram tendência de diminuição e alcançaram os valores mais baixos da série histórica (Figura 1 C e E). Como durante a fase fria da ODP, os eventos de La Niña são mais intensos e frequentes, pois a ODP e o ENOS estão em fase fria (Kayano & Andreoli, 2007), no Rio Grande do Sul, as chuvas ocorrem abaixo da média (Berlato & Fontana, 2003), o que contribui para a menor concentração de vapor d'água na atmosfera e resulta em menor efeito estufa e maior redução ou abaixamento da temperatura durante a noite. Quando a ODP está na fase quente, os eventos El Niño são mais intensos e frequentes (Kayano & Andreoli, 2007;Streck et al, 2009), o que contribui, no Rio Grande do Sul, para a ocorrência de chuva acima da normal do período e, consequentemente, maior teor de vapor d'água na atmosfera, que favorece a ocorrência do efeito estufa e causa menor abaixamento da temperatura noturna, como ocorreu com a máxima anual e semestral da temperatura mínima, na fase quente da ODP de 1925-1946 (Figuras 1 E, 2 E e 3 E).…”

Section: Resultsunclassified

Variabilidade interdecadal na série secular de temperatura do ar em Santa Maria, RS

Streck

Gabriel

Buriol³

et al. 2011

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi verificar possíveis associações entre a variabilidade interdecadal das temperaturas mínima (T mín ) e máxima (T máx ) diárias do ar e da amplitude térmica diária (ATD) em Santa Maria, RS, com a Oscilação Decadal do Pacífico (ODP). Foram usados os valores diários de T mín e T máx de janeiro de 1912 a dezembro de 2009, e os valores mensais do índice da ODP do mesmo período. Há associação entre a variabilidade interdecadal da T mín e T máx e da ATD com a ODP nesse local. Na fase fria da ODP, de 1947ODP, de -1976, houve decréscimo nas T mín e T máx . Nas duas fases quentes da ODP, 1925ODP, -1946ODP, e de 1977ODP, -1998, houve aumento na T mín no primeiro período e na T máx no segundo período. Durante a fase fria da ODP, de 1947ODP, de -1976, houve redução da ATD, pela diminuição da T máx média e máxima. Houve aumento na ATD, no primeiro semestre na fase fria atual (1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009), em razão da diminuição na média da T mín . Esses ciclos de aquecimento e resfriamento, na escala decadal, podem nortear estratégias de adaptação e mitigação na agricultura, por meio do melhoramento genético e desenvolvimento de cultivares tolerantes a tais oscilações de temperatura.Termos para indexação: adaptação, agricultura, clima, mitigação, oscilação de baixa frequência. Interdecadal variability in the secular series of air temperature in Santa Maria, RS, BrazilAbstract -The objective of this work was to verify possible associations between the interdecadal variability of minimum (T min ) and maximum (T max ) daily air temperatures and daily thermal range (DTR) in Santa Maria, RS, Brazil, with the Pacific Decadal Oscillation (PDO). Daily T min and T max values, from January 1912 to December 2009, and the monthly values of the PDO index during the same period were used. There is association between the interdecadal variability of T min , T max , and DTR with the PDO in this location. There was a decrease in T min and T max , during the 1947-1976 cold phase of the PDO. In the two PDO's warm phases, 1925-1946 and 1977-1998, there was an increase in T min during the first period and in T max during the second period. There was a reduction in DTR during the 1947-1976 cold phase of the PDO, due to a reduction of average T max and maximum T max . There was an increase in DTR in the first semester during the current (1999-2009) cold phase of the PDO, due to a decrease in average T min . These warming and cooling cycles, on the decadal time scale, may help in defining adaptation and mitigating strategies in agriculture through plant breeding and the development of cultivars tolerant to such temperature oscillations.

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“…The study of the series of monthly cumulated precipitation in northwestern Patagonia has confirmed the presence of negative trends in summer, even if the Mann-Kendall test did not show any statistical significance (Table 4). According to Kayano and Andreoli [4] these trends could be explained using the Pacific Decadal Oscillation (PDO). The negative trends of precipitation during the warm months will surely influence the soil water budget, increasing the soil water deficit.…”

Section: Climate Data Analysismentioning

confidence: 99%

“…Recent studies realized by Kayano and Andreoli [4] provided diagnostic evidence on modulations of El Niño-Southern Oscillation (ENSO) teleconnections by lower frequency climate modes. One of these modes is the well known Pacific (inter-)Decadal Oscillation (PDO), which explains part of the decadal-multidecadal variability in the tropical and mid latitude Pacific.…”

Section: Introductionmentioning

confidence: 99%

Present Characteristics of Northwestern Patagonia (Argentina)

Scarpati

Botana

Capriolo³

et al. 2011

Water

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Changes experienced in temperature, precipitation, demography and land coverage are the main themes studied in northwestern Patagonia, Argentina, which includes part of Neuqué n, Rí o Negro and Chubut provinces. The precipitation shows important interannual variability and decreases during the warm semester. The mean minimum temperature in January in Neuqué n city increased with statistical significance. Forests and steppe are the more important ecosystems of the area and the native forests of Nothofagus sp. are located mainly in protected areas like National or Provincial Parks. Twenty-eight percent of the Andean-patagonic forests are in the Rí o Negro province, while Neuqué n province has 9% and Chubut province has 26%. The censuses of 1991 and 2001 showed that Los Lagos, Lacar, Picún Leufú and Cushamen are the counties with increasing population.

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Relations of South American summer rainfall interannual variations with the Pacific Decadal Oscillation

Cited by 126 publications

References 57 publications

Interannual relations between South American rainfall and tropical sea surface temperature anomalies before and after 1976

Interannual relations between South American rainfall and tropical sea surface temperature anomalies before and after 1976

Variabilidade interdecadal na série secular de temperatura do ar em Santa Maria, RS

Present Characteristics of Northwestern Patagonia (Argentina)

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