Bidecadal cycles in liquid precipitations in Brazil

Gusev, A. A.; Martin, I. M.; Mello, M. G. Silva; Pankov, V. M.; Pugacheva, G. I.; Schuch, N.; Spjeldvik, W. N.

doi:10.1016/j.asr.2003.03.048

Cited by 20 publications

(12 citation statements)

References 12 publications

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“…On the global scale, the correlation between sunspot number and meteorological parameters may be positive, negative, or even zero (Zhao et al, 2004). However, for South America, few studies on this issue have been reported (Rigozo et al, 2004;Gusev et al, 2004;Rampelotto et al, 2008).…”

Section: Introductionmentioning

confidence: 97%

Variability of rainfall and temperature (1912–2008) parameters measured from Santa Maria (29°41′S, 53°48′W) and their connections with ENSO and solar activity

Rampelotto

Rigozo

Rosa

et al. 2012

Journal of Atmospheric and Solar-Terrestrial Physics

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Section: Introductionmentioning

confidence: 97%

Variability of rainfall and temperature (1912–2008) parameters measured from Santa Maria (29°41′S, 53°48′W) and their connections with ENSO and solar activity

Rampelotto

Rigozo

Rosa

et al. 2012

Journal of Atmospheric and Solar-Terrestrial Physics

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“…There are several studies concerning the solar activity variations on climate (Herman and Goldberg 1978;Nesme-Ribes and Ferreira 1993;Hoyt and Schatten 1997;Haigh 1999;Lean and Rind 1999;Beer 2000;Pugacheva et al 2001;Waple et al 2002;Almeida et al 2004;Gusev et al 2004;Pudovkin 2004;Raspopov et al 2004a, b). Sunspot number is the longest solar activity index available and it is a representative of the general state of solar activity (Hoyt and Schatten 1997).…”

Section: Introductionmentioning

confidence: 98%

Wavelet analysis of a centennial (1895–1994) southern Brazil rainfall series (Pelotas, 31°46′19″S 52°20′ 33″W)

Echer

Nordemann

et al. 2007

Climatic Change

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In this work we apply the wavelet transform to the Pelotas (southern Brazil) total annual rainfall series . Classical, wavelet and cross-wavelet analyses were performed in the El Niño Southern Oscillation (ENSO), Quasi-Biennial Oscillation (QBO), sunspot number (Rz) and Pelotas rainfall time series. Classical spectral analysis for Pelotas has shown a large number of short periods -between 2.2-5.6 years (yr) and periods at 8.9, 11.7 and 24.9 yr. Further, we have found that the Pelotas rainfall wavelet spectrum shows the most significant periodicities around 2-8 yr, but they have an intermittent character. Cross-wavelet spectrum showed that: rainfall and QBO series are correlated at 2-3 yr (QBO) scales and this cross-power is continuous along the time series interval; rainfall and SOI have higher cross-power around 4-8 yr, but this signal is sporadic; rainfall and sunspot number (Rz) showed higher cross-power around the 11-yr solar cycle period, but this crosspower is sporadically high and low; finally, the rainfall cross-spectrum with the double sunspot number (Rz22) revealed a high cross-power around 20-22 yr which is more persistent in duration, compared to the 11-yr period. These wavelet results are compared with classical spectral analysis and with previous work results. We concluded that the phenomenon that influences most of Pelotas rainfall variability is ENSO, but only a minor part of the variance (∼30%) can be described by a simple multi-linear dependence on solar/ ENSO/QBO phenomena, this result could imply that non-linear coupling among sun and internal climatic variability (QBO, ENSO) has an important role in the local/regional climate variations.

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“…At longer timescales, solar activity variability can also affect temperature and rainfall patterns. A possible climatic modulation by solar activity at these timescales was suggested by Gusev et al (2004) andSouza Echer et al (2008). Spectral analysis of tree growth rings over the last centuries indicated climatic variations associated with ENSO on an interannual timescale and with solar activity on decadal to multidecadal timescales (Rigozo et al, 2003(Rigozo et al, , 2004Prestes et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Evidence for cosmic ray modulation in temperature records from the South Atlantic Magnetic Anomaly region

Frigo

Pacca²,

Filho³

et al. 2013

Ann. Geophys.

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Abstract. Possible direct or indirect climatic effects related to solar variability and El Niño-Southern Oscillation (ENSO) were investigated in the southern Brazil region by means of the annual mean temperatures from four weather stations 2 degrees of latitude apart over the South Atlantic Magnetic Anomaly (SAMA) region. Four maximum temperature peaks are evident at all stations in 1940, 1958, 1977 and 2002. A spectral analysis indicates the occurrence of periodicities between 2 and 7 yr, most likely associated with ENSO, and periodicities of approximately 11 and 22 yr, normally associated with solar variability. Cross-wavelet analysis indicated that the signal associated with the 22 yr solar magnetic cycle was more persistent in the last decades, while the 11 yr sunspot cycle and ENSO periodicities were intermittent. Phase-angle analysis revealed that temperature variations and the 22 yr solar cycle were in anti-phase near the SAMA center. Results show an indirect indication of possible relationships between the variability of galactic cosmic rays and climate change on a regional scale.

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Bidecadal cycles in liquid precipitations in Brazil

Cited by 20 publications

References 12 publications

Variability of rainfall and temperature (1912–2008) parameters measured from Santa Maria (29°41′S, 53°48′W) and their connections with ENSO and solar activity

Variability of rainfall and temperature (1912–2008) parameters measured from Santa Maria (29°41′S, 53°48′W) and their connections with ENSO and solar activity

Wavelet analysis of a centennial (1895–1994) southern Brazil rainfall series (Pelotas, 31°46′19″S 52°20′ 33″W)

Evidence for cosmic ray modulation in temperature records from the South Atlantic Magnetic Anomaly region

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