5 research outputs found
Relationship Among a Supernova, a Transition of Polarity of the Geomagnetic Field and the Pliocene-Pleistocene Boundary
After the Middle Miocene, two important climatic changes took place, consisting mainly of cooling in both hemispheres. One occurred between 7.0 and 5.4 Ma and another at the end of the Pliocene, which marked the beginning of the Pleistocene in approximately 2.58 Ma. The proposal of thispresentation is to analyze diverse forcings of these climatic changes, such as the influence of the joint occurrence of reversions of the geomagnetic field andexplosions of a supernova. These events occurred coincidentally with thecooling of Earth. Also, biological changes in those time intervals are analyzed,especially the evolution of the Hominins since the oldest hominin fossils. Thecharacteristics of the Galactic Cosmic Rays, its influence on the climate and its potential mutogenetic effect were taken into account.Briefly, according to our analysis, it seems to be evident that together withother factors, the joint occurrence of the explosion of a supernova at less than100 pc from the Earth and the weakening and/or reversion of the GeomagneticField was an important factor that promoted these two climatic and ecosystemchanges.Fil: Compagnucci, Rosa Hilda. Universidad de Buenos Aires; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Orgeira, Maria Julia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; ArgentinaFil: Sinito, Ana Maria. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Cappellotto, Luiggina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geociencias Básicas, Aplicadas y Ambientales de Buenos Aires; ArgentinaFil: Plastani, María Sofía. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentin
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Solar Influence on Global and Regional Climates
The literature relevant to how solar variability influences climate is vast—but
much has been based on inadequate statistics and non-robust procedures. The common
pitfalls are outlined in this review. The best estimates of the solar influence on the global
mean air surface temperature show relatively small effects, compared with the response to
anthropogenic changes (and broadly in line with their respective radiative forcings).
However, the situation is more interesting when one looks at regional and season variations
around the global means. In particular, recent research indicates that winters in Eurasia
may have some dependence on the Sun, with more cold winters occurring when the solar
activity is low. Advances in modelling ‘‘top-down’’ mechanisms, whereby stratospheric
changes influence the underlying troposphere, offer promising explanations of the observed
phenomena. In contrast, the suggested modulation of low-altitude clouds by galactic
cosmic rays provides an increasingly inadequate explanation of observations