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Water Vapour Exchange Study - WaVES A 3D Lagrangian Model study of Troposphere-Stratosphere exchange focusing on water vapour (WAVES)
Start date: Oct 1, 2007, End date: Sep 30, 2009 PROJECT  FINISHED 

Current state-of-the-art modelling tools do not fully explain the observational records for stratospheric water vapour. Observed stratospheric water vapour trends can only partially be explained by increasing methane. The development of a 3D Lagrangian coupled tropospheric-stratospheric model to study water vapour transport into the stratosphere is proposed.Existing state-of-the-art capabilities will be extended by improving vertical wind transport and mixing schemes, and incorporating a microphysical model. These advancements in modelling tools will allow the assessment of the radiative forcing and climate change implications due to particulate water transport into the stratosphere induced by anthropogenic aerosol emissions. Also, the implications for surf ace ultra-violet levels will be able to be assessed due to the role that stratospheric water vapour plays in stratospheric ozone loss processes.Advanced modelling capability over the current error prone assimilation methods for the vertical wind transport scheme will be achieved by radiative transfer calculations. A mixing parameterization will enable a physically realistic representation of transport processes in the tropical tropopause layer and into the stratosphere. Incorporation of a microphysical mod el will allow the interaction of non-equilibrium microphysics and sedimentation of particles to be studied.The modelling approach proposed will facilitate the examination of eddy transport processes on water vapour variability and allow drivers of observational stratospheric water vapour records to be assessed. Furthermore, the assessment and quantification of the impact of anthropogenic emissions on stratospheric water vapour will be able to be performed with more rigour than previously.
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