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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Evidence of high-energy particle precipitation effects on the atmosphere composition and dynamics in the Southern Hemisphere Magnetic Anomaly region Vieira Luis Lab. de Physique et Chimie de l'Environnement et de l'Espace, CNRS and University of Orleans, France Observations of atmospheric and oceanic parameters indicate that the climate is changing on global and regional scales. The changes of the solar energy output (e.g. total and spectral solar irradiance), atmospheric composition, oceanic dynamics, and Earth’s surface properties are the main causes of the observed climate change. In order to assess the causes of changes on regional scales, it is necessary to distinguish the mechanisms responsible for changes in semipermanent atmospheric systems such as the Intertropical Convergence Zone (ITCZ), subtropical high-pressure centers, and jet streams. The region encompassing the South America and adjacent oceans provides a unique scenario to investigate the role of natural drivers of climate change. From the point of view of atmospheric-oceanic sciences, the variability of climatic phenomena such as the El Nino-Southern Hemisphere Oscillation (ENSO) is crucial to understand the evolution of several atmospheric systems. From the point of view of space sciences, the presence of the southern hemisphere magnetic anomaly (SHMA) provides the opportunity to investigate the coupling between the neutral and ionized components of the atmosphere. However, we noted that the energetic coupling between phenomena observed in the neutral and ionized components of the atmosphere in the SHMA has not been extensively investigated. Here we show that the stratospheric patterns in the southern hemisphere tropical and subtropical regions match the pattern of the Southern Hemisphere Magnetic Anomaly (SHMA). We found that during the austral winter and spring, in the subtropical region (below 30o S), the reduction of the lower stratosphere temperature occurs systematically in the magnetic anomaly area. The differences between the temperatures inside the magnetic anomaly (60o W) and outside the anomaly (150o E) for 42.5o S from June to November are higher than 2 K. The maximum difference at this latitude is approximately 5.9 K and occurs in October during the austral spring.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Gravity Wave Coupling into the Tropical MLT Vincent Robert , Kovalam Sujata , Reid Iain University of Adelaide Gravity (buoyancy) waves play an important role in transferring momentum from source regions in the lower atmosphere to the middle and upper atmosphere. Body forces produced by breaking waves lead to residual circulations that profoundly affect the state of the atmosphere. This talk summarizes results from a campaign held near Darwin in northern Australia in January-February 2006 to measure wave generation and propagation and the associated momentum fluxes. The project used a variety of radars to study the spatial and temporal variability of rainfall and the associated latent heat release during large convective storms. A high-resolution numerical model utilized the latent heat release to compute the spatial and geographic variation of gravity wave generation and propagation into the lower stratosphere. Gravity wave ray-tracing techniques were then used to estimate the wave flux penetrating to heights near 90 km, where the results were compared with direct measurements made using a meteor radar. It is shown that there is excellent agreement between the direct and indirect estimates of wave activity. Wave fluxes show a high degree of temporal variability, with consequent variability in momentum flux deposition and wave drag
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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