HR: 10:50h
AN: A52B-03    [Abstracts]
TI: On the nature of the solar influence on climate and its contribution to climate change
AU: * Vieira, L A
EM: vieira-le@uol.com.br
AF: Universidade do Vale do Paraíba, Instituto de Pesquisa e Desenvolvimento Av. Shishima Hifumi, 2911 - Urbanova , Sao Jose dos Campos, SP 12244-000, Brazil
AU: da Silva, L A
EM: ligia@cptec.inpe.br
AF: Instituto Nacional de Pesquisas Espaciais (INPE), Av. dos Astronautas, 1758, Sao Jose dos Campos, SP 12227-010, Brazil
AU: Guarnieri, F
EM: guarnieri@dge.inpe.br
AF: Universidade do Vale do Paraíba, Instituto de Pesquisa e Desenvolvimento Av. Shishima Hifumi, 2911 - Urbanova , Sao Jose dos Campos, SP 12244-000, Brazil
AU: Echer, E
EM: eecher@dge.inpe.br
AF: Instituto Nacional de Pesquisas Espaciais (INPE), Av. dos Astronautas, 1758, Sao Jose dos Campos, SP 12227-010, Brazil
AU: Dal Lago, A
EM: dallago@dge.inpe.br
AF: Instituto Nacional de Pesquisas Espaciais (INPE), Av. dos Astronautas, 1758, Sao Jose dos Campos, SP 12227-010, Brazil
AU: Wrasse, C M
EM: cmw@univap.br
AF: Universidade do Vale do Paraíba, Instituto de Pesquisa e Desenvolvimento Av. Shishima Hifumi, 2911 - Urbanova , Sao Jose dos Campos, SP 12244-000, Brazil
AU: Schuch, N
EM: njschuch@lacesm.ufsm.br
AF: Instituto Nacional de Pesquisas Espaciais (CRS - INPE), Campus da Universidade Federal de Santa Maria – UFSM Centro Tecnológico – LACESM – Cidade Universitária , Santa Maria, RS 97105-900, Brazil
AB: The influence of solar magnetic variability on the lower atmospheric regions has been observed on different atmospheric parameters in different time scales, but a plausible mechanism to explain these observations remains unclear. It is also indistinguishable whether or not the variability on the solar-terrestrial coupling drives the present climate change. New observations suggested that the existence of a geomagnetic signal in climate data would support a direct link between solar variability and their effects on climate. Usoskin and colleagues compared 1000-year reconstructions of sunspot numbers and cosmic ray flux, derived from cosmogenic isotope dates, with air temperature history in the Northern hemisphere. They observed higher temperatures during periods of intense solar activity. In addition, they report that three different statistical tests consistently indicate that the long-term trends in the temperature correlate better with cosmic rays than with sunspot numbers. Vieira and Da Silva observed that the clouds effects on the radiative flux in the atmosphere in the southern Pacific are related to the intensity of the geomagnetic field. They have also observed a cosmic rays modulation of the variability of the long wavelength radiative flux in the atmosphere. More recently, Vieira and colleagues reported that a correlation between increasing sea-level pressure in the tropical Pacific, and decreasing magnetic field intensity is observed. This indicates that the physical processes in the magnetosphere, ionosphere and upper atmosphere are mapped downward to the Earth's surface. It was suggested that that the coupling mechanism may be linked to the ozone depletion in the lower mesosphere, and in the upper stratosphere of the auroral region, and/or the southern hemisphere magnetic anomaly region. The depletion is caused by high energy protons produced during solar proton events (SPEs) released during large solar storms. Variations in solar irradiance, and ozone levels produced by highly energetic protons and/or electron precipitation in the magnetic anomaly, or auroral region, may lead to small but significant changes in global weather patterns. Numerical experiments have shown slight changes to the stratospheric diffusion resulted in quite different tropospheric circulations, when compared to unperturbed conditions. If the solar activity modulates the mesospheric and stratospheric, temperature and dynamics in this way, most of the observed correlations between cosmic rays and cloud coverage, at least in the south Pacific, may be due to changes in the circulation patterns. This view is opposed to atmospheric ionization, and changes in the atmospheric electric field due to cosmic rays. Here we discuss the fundamental physical processes of the space environment from the Sun to Earth and the possible connection of changes of the geomagnetic field configuration and the increase of the Earth's temperature.
DE: 1616 Climate variability (1635, 3305, 3309, 4215, 4513)
DE: 1650 Solar variability (7537)
DE: 3310 Clouds and cloud feedbacks
DE: 3337 Global climate models (1626, 4928)
DE: 7974 Solar effects
SC: Atmospheric Sciences [A]
MN: 2007 Joint Assembly