Role of the subdaily air-sea interaction on the convection over the Maritime Continent

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K14560
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 17020:Atmospheric and hydrospheric sciences-related
• Research Institution: Japan Agency for Marine-Earth Science and Technology
• Principal Investigator: Zhao Ning (趙寧) 国立研究開発法人海洋研究開発機構, 地球環境部門(大気海洋相互作用研究センター), 研究員 (10823130)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: 大気海洋相互作用 / 日周期変動 / 対流活動 / 海大陸 / 大気海洋結合モデル / 領域気象モデル

Outline of Final Research Achievements

This study was conducted to evaluate the responses and related mechanisms of the diurnal atmospheric and oceanic variations in the Maritime Continent (MC) region to the large-scale atmospheric processes. With the help of observational data and high-resolution numerical models, the role of diurnal air-sea interaction in those processes was also evaluated. Results show that the large-scale processes could greatly influence the diurnal variations in the MC region by changing the background wind fields, which modulated the land-sea breeze and the evaporation at the sea surface, while the topography could also play a role according to the background wind direction. Furthermore, based on the sensitivity experiments using regional atmospheric model and a coupled atmosphere-ocean model, results suggest that the air-sea interaction could enhance convective activities via the enhanced surface evaporation during the daytime.

Free Research Field

大気水圏科学関連

Academic Significance and Societal Importance of the Research Achievements

海大陸における活発な大気海洋相互作用による生じた対流活動が全球の大気循環に影響を及ぼす。そこの対流活動と大気海洋相互作用の役割の理解を深めると、局域ではなく日本を含む全球規模の大気変動の再現性と予測改善が期待される。本研究では、観測と数値実験両方を用いて、海大陸における対流活動が大規模大気変動に対する新たな応答メカニズムを提唱し、対流活動の変動に対する大気海洋相互作用の役割も定量的に評価した。これらの知見は、我々が大気海洋相互作用に対する理解を深化できるとともに、現業の気候モデルと予報モデルの改善に貢献するものである。