Long-term solar activity influences on South American rivers

Mauas, P. J. D.; Buccino, A. P.; Flamenco, Eduardo

doi:10.1016/j.jastp.2010.02.019

Cited by 32 publications

(27 citation statements)

References 23 publications

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“…Moreover, the occurrence years of both the maximum number of sunspots and the maximum lunar declination angle basically correspond to the crests of the reconstructed runoff time series with fluctuation periods of 8.5-12 and 17-21.5 years (Figures 6a-6f). This finding indicates that the crests and troughs of SLPMs activity could diminish or enhance the runoff, which is in agreement with previous studies related to the stream flow of South American rivers (Mauas et al, 2008;Mauas et al, 2011). This finding indicates that the crests and troughs of SLPMs activity could diminish or enhance the runoff, which is in agreement with previous studies related to the stream flow of South American rivers (Mauas et al, 2008;Mauas et al, 2011).…”

Section: The Impacts Of Slpms On Extreme Hydrological Eventssupporting

confidence: 92%

“…The runoff of most rivers in the world has approximately quasi 2 years, 4-to 7-year, 8-to 12-year, and 17-to 21-year periods of frequency fluctuation, which could be affected by a very complex set of natural climatic variabilities (Agnihotri et al, 2002;Mauas et al, 2011). Internal climate variability or natural forcing (e.g., the Pacific Decadal Oscillation and the Atlantic Multidecadal Oscillation) is likely to be the direct driver of inducing oscillation of the rivers discharge.…”

Section: Discussionmentioning

confidence: 99%

“…In addition, climatic conditions at different latitudes cause enhanced solar activities, producing greater evaporation in relatively cloud-free regions in the subtropics; the resulting moisture then converges into the precipitation convergence zones (Mauas et al, 2008;Milliman et al, 2008). For instance, large amounts of rainfall occurred at the equator and midlatitude, while low amounts of rainfall in subtropical zones (IPCC, 2007;Mauas et al, 2011). For instance, large amounts of rainfall occurred at the equator and midlatitude, while low amounts of rainfall in subtropical zones (IPCC, 2007;Mauas et al, 2011).…”

Section: Discussionmentioning

confidence: 99%

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Detection of Linkage Between Solar and Lunar Cycles and Runoff of the World's Large Rivers

Dai

Tang

et al. 2019

Earth and Space Science

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It is an ongoing concern that global hydrological cycle can be likely intensified under context of climate change and anthropogenic actions. Here, our results show that the solar and lunar periodic motions (SLPMs) have substantial impact on the runoff of the world's large rivers. We estimate that SLPMs can produce a change of the world's large rivers runoff by as much as 6.7%. Although climate models suggest that the increased frequency of extreme events is attributed to anthropogenic activities, it is out of our expectation that as much as 73% and 85% of the extreme flood and drought events (based on runoff discharged to the ocean) appear in resonance with SLPMs, respectively. A reevaluation of impacts of SLPMs on changes in the world's river runoff is urgently needed, especially when extreme drought and flood events are on the rise.

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Section: The Impacts Of Slpms On Extreme Hydrological Eventssupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Detection of Linkage Between Solar and Lunar Cycles and Runoff of the World's Large Rivers

Dai

Tang

et al. 2019

Earth and Space Science

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“…Another distinct SSN–PAR connection is through the ∼30‐year oscillation, previously detected by Mauas et al () and Mauas et al () as a multidecadal oscillation. It seems to be significant in the Morlet WTC s/n local spectrum throughout the analysed period.…”

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

“…Mauas et al (), after the elimination of secular trends and cycles with periods equal or smaller than 11 years in the time series of the sunspot numbers (SSNs) and the Paraná River (PAR) discharges at Corrientes gauging station (Figure ), obtained strong positive correlations at interdecadal scales. Furthermore, Mauas et al () have shown similar results for San Juan, Atuel and Colorado subtropical Andean rivers. The authors propose that at multidecadal scales ‘ higher solar activity corresponds to larger precipitation, both in summer and in wintertime, not only in the large basin of the Paraná, but also in the Andean region north of the limit with Patagonia ’.…”

Section: Introductionmentioning

confidence: 99%

Are southern South American Rivers linked to the solar variability?

Compagnucci

Berman

Herrera

et al. 2013

Intl Journal of Climatology

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This article explores the Sun's influence on the hydrological cycle in southern South America (SSA) at the range of interannual‐to‐multidecadal scales from the early 1900s to 2011. The solar variability is described by the sunspot number (SSN) index. The hydrological cycle is examined by using annual mean discharges of the Paraná River (PAR) and the Atuel River (ATU) that represents the behaviour of the subtropical Argentinean Andean hydrological system. Wavelet‐based methods are used in order to describe relationships in the entire time‐frequency domain. The SSN–PAR connection is statistically weak in oscillations with period about 11 years (the Schwabe's solar cycle). Therefore, the solar forcing at this scale must be considered with great caution. The periodicity about 30 years is highly significant throughout the analysed period. Two potential physical mechanisms affecting the Paraná discharge could be involved: one is the solar irradiance influence on the Inter Tropical Convergence Zone (ITCZ), and the other is the solar influence on the Pacific long‐term variability. The SSN–ATU connection shows by far the most striking, robust and convincing result for the Schwabe cycle. A large amplitude and statistically significant cycle with a period about 11 years is observed not only in the Morlet‐based global and local wavelet spectra of the Atuel discharges and SSN but also in the global and local spectra of Cross and Coherent wavelets in most of the analysed period. High (low) discharges occur following maxima (minima) of the Schwabe cycles with time lags of up to ∼2 years. Previous studies have shown a close relationship between the subtropical Argentinean Andean Rivers and the El Niño/Southern Oscillation (ENSO), as well as a solar influence on the ENSO variability. We suggest that El Niño events occurring a few years after solar maxima could explain the connection. Periodicities longer than 30 years are suggested.

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Wavelet analysis of some rivers in SE Europe and selected climate indices

Briciu

Mihăilă

2014

Environ Monit Assess

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The influence of some climatic oscillations and sunspot number on river flows in Romania, Ukraine, and Moldova is verified by using standard wavelet analyses. The selected climate oscillations are Arctic Oscillation (AO), Antarctic Oscillation (AAO), East Atlantic Oscillation (EAO), East Atlantic/West Russia Oscillation (EAWRO), NINO3.4, North Atlantic Oscillation (NAO), Pacific/North America Oscillation (PNAO), Pacific Decadal Oscillation (PDO), Polar/Eurasia Oscillation (PEO), Scandinavian Oscillation (ScandO), Southern Oscillation (SO), and West Pacific Oscillation (WPO). Forty-five hydrological stations from an area of 45,000 km(2) were used in order to discover the spatial evolution of the periodicities found in rivers. The wavelet analysis is novel for the rivers in the study area. There is an important difference between the periodicities found in mountain and plateau areas and those found in the plain area. There is a general downstream increase in the confidence level of the identified periods, even if the atmospheric precipitation has more relevant periodicities in the mountain area. The periodicities can be grouped into two compact groups: 1-16.5 and 27.8-55.6 years. The correlation matrix of the global wavelet spectrum (GWS) values indicates that NAO, EAWRO, PDO, and the sunspot number are the main factors that generate the periodicities in rivers. It is the first time when the influence of PDO on local rivers is proven. All river periodicities smaller than 16 years have a confidence level of 0.95 or above, as proven by the GWS analysis of the daily discharge data, and are caused by multiple external factors.

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Long-term solar activity influences on South American rivers

Cited by 32 publications

References 23 publications

Detection of Linkage Between Solar and Lunar Cycles and Runoff of the World's Large Rivers

Detection of Linkage Between Solar and Lunar Cycles and Runoff of the World's Large Rivers

Are southern South American Rivers linked to the solar variability?

Wavelet analysis of some rivers in SE Europe and selected climate indices

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