HR: 1340h
AN: A13A-0904    [Abstracts]
TI: Coupling Orographic and Non-Orographic Gravity Wave Parameterizations for Global Weather Forecast Models With a High Top
AU: * Kim, Y
EM: kimyj@nrlmry.navy.mil
AF: Naval Research Laboratory, 7 Grace Hopper Ave. Stop 2, Monterey, CA 93943 United States
AU: Peng, M S
EM: peng@nrlmry.navy.mil
AF: Naval Research Laboratory, 7 Grace Hopper Ave. Stop 2, Monterey, CA 93943 United States
AB: Representing the effects of subgrid-scale atmospheric gravity waves on grid-scale variables is an important task in global modeling effort. While based on similar pioneering studies, the parameterization for gravity waves has evolved rather independently, focusing on different areas in the atmosphere, i.e., the middle atmosphere and the lower atmosphere. These parameterizations targeted for different regions typically consider wave sources either of specific individual origins, such as mountains and convective systems for lower atmospheric models, or of collective origin as broad spectra for middle atmospheric models. The former is focused on medium-range weather prediction while the latter emphasizes on climate variability. Due to the advances in atmospheric modeling, computing technology as well as scientific knowledge, however, the distinction between these modeling efforts is becoming progressively vague. This thus may be the time to consolidate the parameterizations of different applications to form a unified parameterization suitable for models covering from earth­_s surface to high altitudes such as the middle atmosphere. The gravity wave parameterizations have generally been implemented independently for aforementioned regions, but it may be desirable to couple them loosely or tightly. For example, gravity waves originate mostly in the lower atmosphere, and currently there are not enough observations to constrain the source information for current spectral gravity-wave drag parameterizations, which generally utilize too idealized wave source information at an arbitrary source height. Whether coupled or not, the harmony of these parameterizations in a high-altitude model is an important issue. This study will report our efforts for coupling the three distinctive parameterizations, of orographic, convective and spectral gravity waves, with a global weather forecast / research model.
DE: 3319 General circulation (1223)
DE: 3334 Middle atmosphere dynamics (0341, 0342)
DE: 3337 Global climate models (1626, 4928)
DE: 3362 Stratosphere/troposphere interactions
DE: 3384 Acoustic-gravity waves
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005