清浄な南極地域でもヘイズ現象が出現～大気化学過程・雲過程を介して気候変動に与える影響も～

2025-08-22 ,福岡大学理学部,京都大学生存圏研究所,名古屋大学大学院環境学研究科,国立極地研究所

＜関連情報＞

• https://www.nipr.ac.jp/info2025/20250822-3.html
• https://www.nature.com/articles/s41612-025-01176-9

南極の昭和基地における南極の霧現象：季節的な特徴と気化学への影響 Antarctic haze phenomena at Syowa Station, Antarctica: seasonal features and impacts on atmospheric chemistry

Keiichiro Hara,Kano Osato,Masanori Yabuki,Kazuo Osada,Naohiko Hirasawa,Masataka Shiobara & Takashi Yamanouchi
npj Climate and Atmospheric Science  Published:01 August 2025
DOI:https://doi.org/10.1038/s41612-025-01176-9

Abstract

Despite the cleanest conditions, haze phenomena were observed at Syowa Station, Antarctica. During our measurements period of 1997–2022, 113 haze events were identified. General characteristics of Antarctic haze such as duration and horizontal scale were obtained from haze event analyses. Antarctic haze near the surface was identified mostly during May–October. Seasonal features of the Antarctic haze appearance were that they were maximal in August and were associated with strong wind conditions and sea-ice extent. Aerosol enhanced layers (AELs) appeared in the surface – free troposphere (ca. 4 km). AELs were identified also in mid-April – October. Furthermore, surface ozone (O₃) was depleted during the Antarctic haze. The O₃ depletion amount was maximal during August and minimal during polar night (June). Findings suggest that Antarctic haze phenomena make important contributions to atmospheric oxidative capacity and cloud processes in the Antarctic troposphere.