scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Middle Atmosphere Ozone Recovery and Climate Change Chipperfield Martyn Stratospheric ozone depletion has been observed over the past few decades. The dominant driver for this change has been increased loss from chlorine and bromine species, derived from source gases such as CFCs. Due to limits on production and emission of halogenated source gases the stratospheric abundance of chlorine and bromine is expected to return to 1980 levels (i.e. pre observed ozone loss) by about 2050. Therefore, stratospheric ozone is expected to recover on approximately the same timescale. However, there is a strong 2-way coupling between stratospheric ozone and climate. Past depletion of stratospheric ozone has had an important impact on climate both locally in the stratosphere and at the surface. Other climate-induced changes in the stratosphere (e.g. cooling due to CO2 increases) have significant impacts. In the future these impacts will determine the rate and extent of ozone recovery. In this talk I will discuss current science issues in ozone depletion/recovery. The talk will emphasise the interactions of ozone loss and climate change and will draw on 3D model results from the recent SPARC CCMVal activity.
STP12 Abstracts Berlin, 12 - 16 July 2010 SCOSTEP Symposium 2010 Solar dynamo and variability Choudhuri Arnab The sunspot cycle is believed to be produced by a flux transport dynamo, in which the toroidal field is produced from the poloidal field by stretching due to differential rotation, the poloidal field is produced by the Babcock-Leighton process and the meridional circulation plays an important role. I shall survey the important developments in the flux transport dynamo model and then discuss how this model can be applied to explain the irregularities of the sunspot cycle, leading to the possibility of predicting the strengths of future cycles.
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scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

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