@article{oai:nipr.repo.nii.ac.jp:00002966,
 author = {Hirota, Michio and Nagata, Kazuhiko and Yoshimatsu, Kazuyoshi and Miyagawa, Koji and Ikeda, Yukiko and Fujimoto, Toshifumi and Makino, Yukio},
 journal = {Polar meteorology and glaciology},
 month = {Nov},
 note = {P(論文), To determine the boundary region of the polar vortex objectively using the PV distribution on isentropic surfaces, the equivalent latitude(Eql) of the polar vortex boundary was calculated using a slightly modified form of the technique of E.R. Nash et al.(J. Geophys. Res., 101D, 9471, 1996). Using the NCEP/NCAR reanal- ysis data, the Eql of the polar vortex boundary region in the winter of 1999/2000 was calculated, and compared with the ozone mixing ratio in the lower stratosphere over Eureka observatory(80°N , 86°W ). The results indicate that this method determines the boundary region of the polar vortex well.},
 pages = {116--122},
 title = {Report on the method for determining the location of the polar vortex boundary region},
 volume = {17},
 year = {2003}
}