A Simple Technique to Infer the Missing Gravity Wave Drag in the Middle Atmosphere Using a General Circulation Model: Potential Vorticity Budget

• DOI: 10.1175/jas-d-13-0198.1
• Publication Date: 2013-10-11T15:38:18Z
• Authors: Manuel Pulido
• Keywords: Forcing (mathematics); Momentum (technical analysis); Wave drag

Abstract A simple technique to infer the missing momentum forcing in a general circulation model is developed and evaluated. The response of large-scale dynamic equations an external presents nonlocal zonal meridional wind. On other hand, potential vorticity (PV) local growing geostrophic mode, so that there direct relationship between PV. In this work, fact exploited diagnose extratropics using model. capability estimate concentrated gravity wave dynamical evolved with prescribed sources sinks PV then used these known sinks. found give much better diagnostic drag compared more traditional wind differences. also realistic environment, which Met Office analyses are determined. estimation given by complex data assimilation Pulido Thuburn and, general, good agreement found. can be online cycle, increments analysis, offline, observations.