Record:   Prev Next
作者 Kuester, Michele Ann
書名 Analysis of convectively generated gravity waves within a tropical cyclone environment: Model simulation and satellite observation
國際標準書號 9780549315285
book jacket
說明 166 p
附註 Source: Dissertation Abstracts International, Volume: 68-11, Section: B, page: 7188
Adviser: M. Joan Alexander
Thesis (Ph.D.)--University of Colorado at Boulder, 2007
This study investigates characteristics that are included in various parameterization schemes for gravity waves in short and long term numerical weather prediction (NWP) and global climate models (GCM). The results from this study show that it is important to include not only the heating depth of the source, but also the speed and direction of the source movement. Additionally, the affects of local winds at the source are needed to describe the generation of gravity waves from deep convection in tropical cyclones. This ensures that the forcing terms in the stratosphere from these sources are more representative of the entire wave spectrum. A collaboration with the National Oceanic and Atmospheric Administration (NOAA) has developed simulations of a North Atlantic tropical cyclone at both tropical storm and hurricane stages during NASA's fourth field campaign in the Convection and Moisture Experiment series (CAMEX-4) in 2001 using the Pennsylvania State University-National Center for Atmospheric Research (PSU-NCAR) fifth generation Mesoscale Model (MM5). MM5 simulations are validated by data collected during CAMEX-4 and used to investigate waves generated by the strong convection of a developing tropical cyclone. Observations of gravity waves created by deep convection during the 2005 North Atlantic hurricane season with the Atmospheric Infrared Sounder (AIRS) on the Earth Observing System (EOS) Aqua platform are used to locate and further investigate characteristics of these waves. Information about gravity waves and their sources can be inferred from horizontal and vertical wind and temperature perturbations. Fourier transform analysis of these perturbation fields gives a regional view while wavelet analysis gives a local picture of wave activity. Investigation of the movement of convective sources and local winds gives further insight into the mechanisms that can cause gravity wave generation. Analysis of AIRS Level 1B radiances and Level 2 temperature retrieval, and National Climate Data Center (NCDC) Next Generation Weather Radar (NEXRAD) Weather Surveillance Radar-1988 Doppler (WSR-88D) System data allow investigation of local wave events and the sources that generate them
School code: 0051
DDC
Host Item Dissertation Abstracts International 68-11B
主題 Atmospheric Sciences
Remote Sensing
0725
0799
Alt Author University of Colorado at Boulder. Astrophysical and Planetary Sciences
Record:   Prev Next