日本地球惑星科学連合2023年大会

講演情報

[J] 口頭発表

セッション記号 S (固体地球科学) » S-EM 固体地球電磁気学

[S-EM15] 地磁気・古地磁気・岩石磁気

2023年5月23日(火) 10:45 〜 12:00 303 (幕張メッセ国際会議場)

コンビーナ:吉村 由多加(九州大学大学院比較社会文化研究院)、臼井 洋一(金沢大学)、座長:吉村 由多加(九州大学大学院比較社会文化研究院)、加藤 千恵(九州大学比較社会文化研究院)、北原 優(九州大学 大学院 比較社会文化研究院)


11:30 〜 12:00

[SEM15-08] Response of high-altitude clouds to the decadal cycle of galactic cosmic rays in tropical regions

★Invited Papers

*宮原 ひろ子1草野 完也2片岡 龍峰3、Touber Emile4 (1.武蔵野美術大学、2.名古屋大学、3.国立極地研究所、4.沖縄科学技術大学院大学)

キーワード:宇宙線変動、気候変動、雲活動、太陽気候影響

Direct and proxy-based observations of solar activity and climate in the past have suggested that the Earth’s climate is responding to solar activity at various time scales; however, the detailed mechanisms behind the connection are not clarified. Galactic cosmic rays are one of the possible mediators of the Sun-climate relation, and it has been suggested that they may impact cloud activity by forming aerosols or by affecting the collisional processes with electrical charges. Originally, it was suggested that low-altitude clouds over oceans are responding to GCR variations. However, cloud chamber experiments have indicated that GCR-induced aerosol formation is more efficient at lower temperatures (i.e., upper troposphere). In this presentation, we show that tropical clouds that are produced associated with deep convections are responding to the decadal cycle of GCRs. Furthermore, following the invigoration of deep convective cloud activity, an intensification of atmospheric circulation and an increase in sea surface temperature gradient over the Pacific were observed. We propose that deep convective cloud activity is mediating the GCR-climate connection.