Title Dynamical modes associated with the Antarctic ozone hole
Author Weare, B.C.
Author Affil Weare, B.C., University of California-Davis, Department of Land, Air and Water Resources, Davis, CA
Source Atmospheric Chemistry and Physics, 9(15), p.5403-5416, . Publisher: Copernicus, Katlenburg-Lindau, International. ISSN: 1680- 7316
Publication Date 2009
Notes In English. Published in Atmospheric Chemistry and Physics Discussions: 25 February 2009, http://www.atmos-chem-phys- discuss.net/9/5055/2009/acpd-9-5055-2009.html ; accessed in Apr., 2011. 18 refs. Ant. Acc. No: 91579. GeoRef Acc. No: 310515
Index Terms atmospheric circulation; atmospheric pressure; chemical properties; clouds (meteorology); ozone; solar radiation; statistical analysis; stratosphere; temperature; temperature variations; thermodynamic properties; ultraviolet radiation; variations; velocity; wind velocity; Andes; Antarctica; annual variations; asymmetric distribution; chlorine; climate forcing; clouds; covariance analysis; eddies; electromagnetic radiation; environmental analysis; halogens; radiation damage; Rossby waves; seasonal variations; solar forcing; South America; time series analysis; troposphere; winds
Abstract Generalized Maximum Covariance Analysis (GMCA) has been developed and applied to diagnosing the dynamical modes associated with variations in the Antarctic spring ozone hole. GMCA is used to identify the most important patterns of co-variability between interannual ozone mixing ratio variations in the Antarctic region and temperature, zonal, meridional and vertical velocities between 100 and 10 hPa in the same region. The most important two pairs of GMCA time coefficients show large year-to-year variations and trends, which are connected with the growth of the Antarctic Ozone Hole and the increase of ozone depleting substances. The associated spatial patterns of ozone variations may be characterized as being quasi-symmetric and asymmetric about the pole. These patterns of ozone variations are associated with comparable patterns of variations of temperature and winds through most of the vertical domain. The year 2000 is shown to be dominated by the asymmetric mode, whereas the adjacent year 2001 is dominated by the quasi-symmetric mode. A case study, focusing on the asymmetric differences between these two years, shows the magnitude of the ozone mixing ratio, temperature and zonal wind differences to be in the range of 2 e-6 kg/kg, 10C and 10 m/s, respectively. Budget calculations show that transport processes contribute substantially to the ozone and temperature changes in the middle stratosphere over the Antarctic continent. However, both radiative and chemical processes also play important roles in the changes.
URL http://www.atmos-chem-phys.net/9/5403/2009/acp-9-5403-2009.pdf
Publication Type journal article
Record ID 65007086