HR: 11:05h
AN: A32C-04    [Abstracts]
TI: EOF Analysis of Temperature Anomalies in the Tropics with Radiosonde Data from the SHADOZ Program
AU: * Lee, S
EM: sl@meteo.psu.edu
AF: Penn State University, Meteorology Dept 503 Walker Building, Univ Park, PA 16802, United States
AU: Shelow, D M
EM: dms391@psu.edu
AF: Penn State University, Meteorology Dept 503 Walker Building, Univ Park, PA 16802, United States
AU: Thompson, A M
EM: anne@met.psu.edu
AF: Penn State University, Meteorology Dept 503 Walker Building, Univ Park, PA 16802, United States
AU: Miller, S K
AF: Penn State University, Meteorology Dept 503 Walker Building, Univ Park, PA 16802, United States
AU: Witte, J C
EM: witte@gavial.gsfc.nasa.gov
AF: SSAI at NASA/GSFC, Code 613.3 NASA/Goddard, Greenbelt, MD 20771, United States
AB: A principal component analysis is performed on the vertical temperature and ozone profiles of the Southern Hemisphere Additional Ozonesondes (SHADOZ) soundings (1998-2006). Because the soundings are launched at 5-10 day intervals, the analysis resolves variability at time scales that range from approximately two weeks to eight years. For selected SHADOZ sites, which are distributed throughout the tropics close to the equator, the two most dominant empirical orthogonal functions (EOFs) together represent the Quasi-biennial Oscillation (QBO) in the stratosphere. The third most dominant temperature EOF is found to be closely associated with the El Nino-Southern Oscillation (ENSO). While the principal component (PC) time series of the third EOF is significantly correlated with the Nino3 index, the time series also shows much shorter time scale fluctuations. The vertical scale of the temperature associated with the ENSO is consistent with vertically propagating Kelvin waves. These results indicate that next to the QBO, ENSO has the most ignificant impact on the tropical low stratosphere (LS) temperature signal, and that this LS/ENSO relationship may be realized through vertically propagating Kelvin waves, which have much shorter time scales than ENSO itself.
UR: http://croc.gsfc.nasa.gov/shadoz
DE: 0341 Middle atmosphere: constituent transport and chemistry (3334)
DE: 0350 Pressure, density, and temperature
DE: 3374 Tropical meteorology
DE: 9340 Indian Ocean
DE: 9355 Pacific Ocean
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting