Three‐dimensional properties of Andes mountain waves observed by satellite: A case study

摘要: The southern Andes region has been clearly identified in previous satellite and balloon observations global models as a "hot spot" of small-scale gravity wave activity, with monthly mean momentum fluxes exceeding 10 times background values fall, winter, spring seasons. This makes this focus interest for circulation climate studies. We analyze case study on 8 May 2006, combining from the Atmospheric Infrared Sounder instrument Aqua High Resolution Dynamics Limb Aura to form three-dimensional picture field. show widespread pattern over extending eastward south Atlantic. Simulations Weather Research Forecasting model identify waves orographic origin, but observed is far simple two-dimensional field forced by steady flow mountain ridge. morphology consistent linear theoretical calculations downstream propagation latitudinal focusing into stratospheric jet. confirm importance process stratosphere, we find also occurring analysis forecasts European Centre Medium-Range Forecasting. Our evaluates some strengths weaknesses current drag parameterizations relevance parameterization assumptions high resolution. Copyright 2011 American Geophysical Union.