Gravity Wave Effects On Short-Term Tidal Variability In WACCM/eCMAM

Friday, 19 December 2014: 11:35 AM
Ryan Matthew Agner1, Alan Z Liu1, Jian Du2 and Xian Lu3, (1)Embry-Riddle Aeronautical University, Daytona Beach, FL, United States, (2)Univ of Louisville, Louisville, KY, United States, (3)Univ of Colorado, Boulder, CO, United States
Gravity waves and atmospheric tides have strong interactions in the mesopause region and is a major contributor to short term variabilities of the tides in this region. How these two dynamical features interact with each other is poorly understood. In this work, short-term variability of tides in two GCMs, the Whole Atmosphere Community Climate Model and the extended Canadian Middle Atmosphere Model are examined and compared with variabilities in horizontal wind observed with meteor radar at Maui, Hawaii (20.7N, 156.3W) and Cerro Pachón, Chile (30.3S,70.7W). The contributions to these variabilities from parameterized GW forcing in the two GCMs are also analyzed, considering the effects of different model resolutions and GW parameterization schemes in the two models.