第46次南極地域観測隊気象部門報告2005

• Main Authors: 佐藤 健, 西巻 英明, 岩城 貴信, 山本 浩嗣, 伊藤 大輔, Tatsuru Sato, Hideaki Nishimaki, Takanobu Iwaki, Hirotsugu Yamamoto, Daisuke Ito
• Format: Report
• Language: Japanese
• Published: 気象庁/気象庁/気象庁/気象庁/気象庁 2009
• Subjects: Nihon Nankyoku Chiiki Kansokutai; Japan. Kishōchō; 551.5; Antarctic; Syowa Station; Antarc*
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=9497; http://id.nii.ac.jp/1291/00009497/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=9497&item_no=1&attribute_id=18&file_no=1

この報告は,第46次南極地域観測隊気象部門が,2005年2月1日から2006年1月31日まで昭和基地において行った気象観測結果をまとめたものである.観測方法,測器,統計方法等は第45次隊とほぼ同様である. 越冬期間中,特記される気象現象として,次のものが挙げられる.1) 地上気象観測において,2005年の年平均相対湿度73は高い方から,年平均雲量7.5は多い方からの極値を更新し,年平均風速7.2m/sは大きい方から,年合計雪日数228日は多い方から第2位の記録となった.2) ブリザードの回数は,A級6回,B級9回,C級15回の計30回で平年並みだったが,5月は過去最多の5回を記録した.3) 昭和基地上空のオゾン全量日代表値は,8月下旬から10月中旬までオゾンホールの目安となる220m atm-cm以下の値を継続的に下回り,9月の月平均値は173m atm-cmで,過去4番目に少なかった.10月4日には越冬中の最低値である136m atm-cmを記録した. This report describes the results of meteorological observations at Syowa Station from February 1st, 2005 to January 31st, 2006, carried out by the Meteorological Observation Team of the 46th Japanese Antarctic Research Expedition (JARE-46). The observation methods, instruments and statistical methods used by the JARE-46 were almost the same as those used by the JARE-45 observation team. Remarkable weather phenomena observed during the period of JARE-46 are as follows.1) Annual mean relative humidity and cloud amount in 2005 at Syowa Station were 73 and 7.5, both records for Syowa Station. Annual mean wind speed and number of snow days were 7.2m/s and 228 days, both second highest values.2) There were 30 blizzards of which 6 were class A, 9 class B and, 15 class C, typical of a normal year.3) The amount of total ozone over Syowa Station became lower than or equal to 220m atm-cm from the end of August to mid-October. Monthly mean amount of total ozone in September was 173m atm-cm, which was the 4th lowest value in the historical record. On 4th October, the amount of total ozone was 136m atm-cm, which was the lowest value during JARE-46.