Observed and Navy Operational Global Model Climatologies of Synoptic Disturbances Over the Tropical Western Pacific During Winter 1991-92
Chang, C.-P. (Chih-Pei).
MetadataShow full item record
This study compares the structure and characteristics of tropical synoptic timescale wave disturbances over the western Pacific, particularly around the Caroline Islands where six upper air stations are present, as contained in radiosonde observations and the initial analysis (tau00) and 48-h forecast (tau48) of the Navy Operational Global Atmospheric Prediction System (NOGAPS) during northern winter of 1991-1992. The observed, analyzed and forecast disturbance climatologies are all determined from power spectral and cross-spectral analyses focusing on the synoptic frequency band encompassing three adjacent period points: 4.6-, 5.3- and 6.4-day. The meridional wind at 850 hPa is used as the principal parameter for defining the disturbances. The power spectra of the NOGAPS rau00 analysis agree reasonably closely with the radiosonde observations, but the tau48 forecast shows larger differences. Nevertheless, the observed horizontal structure of the disturbances are all well represented in both the analysis and the forecast at all levels. These include the westward propagation, a 850 hPa wavelength near 33 deg along 10 deg N and near 38 deg along the equator, a 200 hPa wavelength near 50-60 deg, and a northeast-southwest meridional tilt. In general, the analysis and the forecast produce a higher spatial coherency than that shown from the radiosonde observations.
Approved for public release; distribution is unlimited.
NPS Report NumberNPS-MR-93-003
Showing items related by title, author, creator and subject.
Corbeille, Reginald Claude (Monterey, California: U.S. Naval Postgraduate School, 1966-10);Radiosonde information is extensively used in the analysis and forecast of meteorological phenomena and the accuracy of both analyses and forecasts is dependent primarily upon the accuracy of the meteorological parameters ...
The numerical weather prediction system at the Italian Air Force Weather Service impact of non-conventional observations and increased resolution Torrisi, Lucio (Monterey California. Naval Postgraduate School, 2004-06);The impact of non-conventional observations and increased horizontal resolution on the numerical weather prediction (NWP) system of the National Center for Aeronautic Meteorology and Climatology of the Italian Air Force ...
Cloud Climatologies for Rocket Triggered Lightning from Launches at Cape Canaveral Air Force Station and Kennedy Space Center Strong, Greg J. (Monterey, California. Naval Postgraduate School, 2012-03);We have conducted a study on the development of detailed climatological probabilities of violating cloud related Lightning Launch Commit Criteria (LLCC) used by Cape Canaveral Air Force Station and Kennedy Space Center ...