Publication Abstracts
Wong 1998
Wong, S., 1998: The Impacts of the Antarctic Ozone Hole on the Middle Atmosphere. Ph.D. thesis. Columbia University.
The large ozone depletion in the southern polar lower stratosphere during austral spring changes the climate in the middle atmosphere. Comparisons between simulations using the GISS/Global Climate Middle Atmospheric Model and observational data analysis are carried out in this study. In the model simulations, it was found that planetary wave propagation from the troposphere plays an essential role in the interannual variability of the size of the ozone hole. The ozone hole can reach higher altitudes and lower latitudes in years of smaller July wave energy. From September onward, the temperatures in the polar lower stratosphere decrease due to local reduction in the solar radiation absorption. In October and November, the temperature changes in the polar lower stratosphere reach about -6 to -12 K. The enhanced meridional temperature gradient in the lower stratosphere increases the zonal winds at subpolar middle stratosphere and tightens the polar vortex. The changed zonal winds change the planetary wave propagation in October and November, with greater Eliassen-Palm (E-P) flux convergence in subpolar to polar latitudes, and maintain a changed residual circulation. The ascent of the changed residual circulation provides cooling in middle latitudes, and the descent, warming in the polar region. The changed residual circulation changes the N2O and CFC-11 distributions significantly in October and November. It takes about 2-3 months for the changes in the distributions to significantly affect the N2O and the CFC-11 lifetimes. In February, the N2O lifetime is reduced by about 5 years, and the CFC-11 lifetime, by about 0.8 years. Multivariate linear regression is carried out to correlate National Meteorological Center (NMC) temperatures, total ozone mapping spectrometer (TOMS) ozone, equatorial zonal winds at 30 mb, and solar variations. The nonlocal linear regression shows temperature change patterns similar to those predicted by model simulations in the southern hemisphere, indicating that the remote impacts simulated in models exist in the real world.
Export citation: [ BibTeX ] [ RIS ]
BibTeX Citation
@phdthesis{wo02000x,
author={Wong, S.},
title={The Impacts of the Antarctic Ozone Hole on the Middle Atmosphere},
year={1998},
school={Columbia University},
address={New York, N.Y.},
}
[ Close ]
RIS Citation
TY - THES ID - wo02000x AU - Wong, S. PY - 1998 BT - The Impacts of the Antarctic Ozone Hole on the Middle Atmosphere PB - Columbia University CY - New York, N.Y. ER -
[ Close ]
