Report on the method for determining the location of the polar vortex boundary region

• Main Authors: Michio Hirota, Kazuhiko Nagata, Kazuyoshi Yoshimatsu, Koji Miyagawa, Yukiko Ikeda, Toshifumi Fujimoto, Yukio Makino
• Format: Report
• Language: English
• Published: Meteorological Research Institute/Japan Meteorological Agency/Japan Meteorological Agency/Aerological Observatory/Japan Meteorological Agency/Japan Meteorological Agency/Japan Meteorological Agency 2003
• Subjects: Eureka; Nash; Polar meteorology and glaciology
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2966; http://id.nii.ac.jp/1291/00002966/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2966&item_no=1&attribute_id=18&file_no=1

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.