Celestial driver of Phanerozoic climate?

Shaviv, Nir J.; Veizer, Ján

doi:10.1130/1052-5173(2003)013<0004:cdopc>2.0.co;2

Cited by 252 publications

(206 citation statements)

References 49 publications

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“…The argument Article published by EDP Sciences A120, page 1 of 7 assumes that the low-altitude cloud coverage increases due to an increased formation of cloud-condensation nuclei when the CR flux is high (Svensmark et al 2007). Thus, an anticorrelation between temperature and CR flux is to be expected and is indeed reported by Shaviv & Veizer (2003). Most recently, Svensmark (2012) has found further evidence of a connection of nearby supernovae and their CR output and life on Earth.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic diffusion of Galactic cosmic ray protons and their steady-state azimuthal distribution

Effenberger

Fichtner

Scherer

et al. 2012

A&A

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Galactic transport models for cosmic rays involve the diffusive motion of these particles in the interstellar medium. Owing to the large-scale structured Galactic magnetic field, this diffusion is anisotropic with respect to the local field direction. We included this transport effect along with continuous loss processes in a quantitative model of Galactic propagation for cosmic ray protons that is based on stochastic differential equations. We calculated energy spectra at different positions along the Sun's Galactic orbit and compared them to the isotropic diffusion case. The results show that a larger amplitude of variation and different spectral shapes are obtained in the introduced anisotropic diffusion scenario, which in turn emphasizes the need for accurate Galactic magnetic field models.

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Section: Introductionmentioning

confidence: 99%

Anisotropic diffusion of Galactic cosmic ray protons and their steady-state azimuthal distribution

Effenberger

Fichtner

Scherer

et al. 2012

A&A

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“…A abertura e fechamento de bacias oceânicas (Fig. 24) de Fischer (1981); (B) Modos quente/frio de Frakes et al (1992); (C) Temperatura superficial do mar em baixa latitudes e registros de paleolatitude de detritos transportados pelo gelo, segundo Veizer et al (2000); (D) Nível do mar segundo Vail et al (1977); (E) Atividade magmática (vulcanismo) segundo Engel & Engel (1964); (F) Fluxo de raios cósmicos, segundo Shaviv & Veizer (2003); (G) Variação geológica da temperatura reconstruída e estimada, segundo Shaviv & Veizer (2003). Fonte: modificado a partir de Shaviv & Veizer (2003) aumenta.…”

Section: Movimentação Tectônicaunclassified

Ciclos climáticos e causas naturais das mudanças do clima

et al. 2018

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TerraeDid atic a IntroduçãoA presente histeria sobre aquecimento global -com a previsão apocalíptica de fusão das calotas de gelo polar, inundação de cidades costeiras e desertificação de zonas produtoras de alimentos -não ajuda os cidadãos a compreender as forças reais e complexas que moldam o clima da Terra (Hecht 1993(Hecht -1994.Tentar entender o clima tem sido prática de sobrevivência desde os primórdios da humanidade. Inegavelmente, compreender o momento ideal do plantio e da colheita fez parte das técnicas da agricultura primitiva que permitiram ao homem a transição do nomadismo para o sedentarismo. Assim, a partir da constatação da óbvia alternância entre o dia e a noite, da observação das fases da Lua, da dedução das estações do ano, foi-se descobrindo a estreita relação entre esses fenômenos (cíclicos e de origem astronômica) com as alterações do clima na Terra (também de caráter periódico). ABSTRACT:The periodic nature of climate changes on the Earth can be explained in terms of a limited number of terrestrial and astronomical factors. In annual/daily scales, the climate varies according to the Earth's revolution and rotation. Medium term climate cycles (decades/centuries/millennia) are related to changes in solar radiation caused by the influences of major planets of the Solar System. Oceanic oscillations (decadal order) are possibly caused by the planetary and lunar influences. Long term climate cycles (tens and hundreds of thousand years) are caused by variations in the parameters of Earth's orbit (eccentricity, obliquity and precession). Impact events of large bodies on the planet and mass extinction arise from supercycles (tens of millions of years) caused by the vertical oscillation of the solar system relative to the galactic plane. Tectonics, volcanism and the evolution of supercontinents exhibit supercycles (hundreds of million years) induced by the Solar System movement around the Milky Way center and by the cosmic rays variation. Astronomical factors permeate virtually all the climate cycles orders, acting directly or indirectly in many bio-geo-oceanic-atmospheric processes. It is concluded that the Earth's climate is characterized by cycles astronomically controlled by the Moon, the Sun, the planets, the Solar System and even the Galaxy. Ciclos climáticos e causas naturais das mudanças do clima

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“…By N. A. SchwAdroN, h. E. SpENcE, ANd r. cAmE controversial [Shaviv and Veizer, 2003]. This is because GCRs not only present a hazard to life through the breakdown of DNA but also may help to stimulate evolution by increasing the rate of cell mutation [Todd, 1994].…”

Section: Pages 297-298mentioning

confidence: 99%

“…Another topic intensely debated is how GCRs may affect life in indirect ways through climate variability [Shaviv and Veizer, 2003]. For example, the Maunder minimum was a prolonged solar minimum for the period spanning roughly 1645-1715 when sunspots became exceedingly rare.…”

Section: Indirect Effects Of Gcrsmentioning

confidence: 99%

Does the space environment affect the ecosphere?

Schwadron

Came

2011

EoS Transactions

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The Sun is now emerging from a deep and protracted solar minimum, when the power, pressure, flux, and magnetic flux of solar wind were at their lowest levels [McComas et al., 2008; Schwadron and McComas, 2008;Connick et al., 2011]. Because of an anomalously weak heliospheric magnetic field and low solar wind pressure, galactic cosmic rays (GCRs)—protons, electrons, and ionized nuclei of elements accelerated to high energies—achieved the highest fluxes observed in the space age (Figure 1) [Mewaldt et al., 2010]. Related observations have shown remarkably rapid changes in the fluxes of energetic neutral atoms (ENAs) used by NASA's Interstellar Boundary Explorer mission to image the global heliosphere surrounding the solar system [McComas et al., 2010]. These changes in ENAs are caused by decreasing solar wind pressure. Does the recent anomalous deep solar minimum hint at larger changes in store? And how do changing GCR fluxes and conditions on the Sun influence Earth's ecosphere? Given the fact that GCR radiation can damage living tissue, causing cellular mutagenesis, the changing state of the Sun may have serious implications for life on the planet.

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Celestial driver of Phanerozoic climate?

Cited by 252 publications

References 49 publications

Anisotropic diffusion of Galactic cosmic ray protons and their steady-state azimuthal distribution

Anisotropic diffusion of Galactic cosmic ray protons and their steady-state azimuthal distribution

Ciclos climáticos e causas naturais das mudanças do clima

Does the space environment affect the ecosphere?

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