FISSION TRACK DATA OF APATITE AND ZIRCON FROM LOWER YANGTZE AREA

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Carbon dioxide degassing flux from two geothermal fields in Tibet,China

Over geological time scales,Earth degassing has a significant impact on atmospheric carbon dioxide(CO2) concentrations,which are an important component of global carbon cycle models.In Tibet,structural conditions and associated widespread geothermal systems lead to carbon dioxide degassing during geothermal water migration.We characterized the hydrochemical conditions of two geothermal fields on the Tibetan Plateau.The chemical composition of geothermal waters was controlled by K-feldspar and albite.Geother...     

A semi-analytical model for the propagation of Rossby waves in slowly varying flow

Instead of using complicated general circulation models (GCMs), a simple semi-analytical model based on ray theory has been used to study energy evolution and ray path of Rossby waves in slowly varying mean flows. Our model yields similar results to those calculated from barotropic models, and also provides a chance to study Rossby waves in the slowly varying flows with both vertical and meridional shears. The model results show that upward Rossby waves can only grow in westerlies, and decay when further ascend. The baroclinic Rossky waves are restrained by the β effect in lower latitude. In the westerly jet with meridional and vertical shears, the barotropic Rossby waves originated from south of the westerly jet, and these can grow while propagating upper-northward. The baroclinic Rossby waves originated from north of the westerly jet and can grow while propagating upward and southward. Such a semi-analytical model provides a simple forecasting tool to allow study of the local weather anomalies to the heating/topography forcing associated with the global warming.