Computer Science
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997phdt........22j&link_type=abstract
Thesis (PhD). CALIFORNIA INSTITUTE OF TECHNOLOGY, Source DAI-B 58/07, p. 3695, Jan 1998, 133 pages.
Computer Science
Scientific paper
In chapter 1, the decadal evolution of the Antarctic ozone hole is studied by using ozone column amounts obtained by the total ozone mapping spectrometer (TOMS) in the southern polar region during late austral winter and spring (Days 240-300) for 1980-1991 using area- mapping techniques and area-weighted vortex averages. The vortex here is defined using the -50 PVU contour on the 500 K isentropic surface. There is a distinct change after 1985 in the vortex averaged column ozone depletion rate during September and October, the period of maximum ozone loss. The mean ozone depletion rate in the vortex between Day 240 and the day of minimum vortex-averaged ozone is about 1 DU/day at the beginning of the decade, increasing to about 1.8 DU/day by 1985, and then apparently saturating thereafter. The vortex-average column ozone during September and October has declined at the rate of 11.3 DU/yr (3.8%) from 1980 to 1987 and at a smaller rate of 2 DU/yr (0.9%) from 1987 to 1991. In chapter 2, we show that standard deviation of column ozone from the zonal mean (COSDZ) provides a measure of the longitudinal inhomogeneity in column ozone and dynamical wave activities in the atmosphere. Simulation of this quantity by three-dimensional (3-D) models could provide a sensitive check on the wave activities in the stratosphere that are responsible for ozone transport. Analysis of the TOMS data shows a profound secular change in COSDZ from 1979 to 1992. In the southern higher latitudes, COSDZ shows a significant increase around 65o in August and September, whereas the changes are much smaller in the northern higher latitudes in the boreal spring. In chapter 3, an estimate of tropospheric ozone levels over tropical pacific South America is obtained from the difference in the TOMS data between the high Andes and the Pacific Ocean. From 1979 to 1992 tropospheric ozone apparently increased by 1.47 ± 0.40 %/yr or 0.21 ± 0.06 DU/yr over South America and the surrounding oceans. We model the direct and diffuse solar fluxes on the ground between tropospheric and stratospheric ozone in chapter 4. The characteristic signature of tropospheric ozone enables us to distinguish a change in tropospheric ozone from that of stratospheric ozone. Light reflected or transmitted by a planetary atmosphere contains information about the particles and molecules in the atmosphere. Therefore, accurately calculating the radiation field is necessary. In the appendix, the doubling-adding method for plane-parallel polarized radiative transfer model is studied in detail. A special Fourier expansion leading to a compact notation is developed for the azimuth-dependent quantities. The multi-layer model for a vertically inhomogeneous atmosphere is implemented. Preliminary runs from this model in the Huggins bands show the distinct features of linear polarization in the reflection spectrum due to the multiple Rayleigh scattering in the troposphere. (Abstract shortened by UMI.)
No associations
LandOfFree
Decadal evolution of atmospheric ozone and remote sensing of tropospheric ozone does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Decadal evolution of atmospheric ozone and remote sensing of tropospheric ozone, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Decadal evolution of atmospheric ozone and remote sensing of tropospheric ozone will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1294770