Climatological features and influence of fluctuation in surface meteorological variables caused by tropical precipitation systems

2015 Fiscal Year Final Research Report

• Project/Area Number: 25800268
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Meteorology/Physical oceanography/Hydrology
• Research Institution: Japan Agency for Marine-Earth Science and Technology
• Principal Investigator: YOKOI Satoru 国立研究開発法人海洋研究開発機構, 大気海洋相互作用研究分野, 主任研究員 (40431902)
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: 降水システム / 冷気外出流 / 海面潜熱フラックス / マッデン・ジュリアン振動

Outline of Final Research Achievements

Data analyses on statistical features of fluctuation in surface meteorological variables caused by tropical precipitation systems reveal that variance of the fluctuation has positive and statistically-significant correlation with precipitation activity, and that the variance reaches its maximum during convectively active phase of Madden-Julian oscillation (MJO), while surface latent heat flux, which results from the fluctuation, reaches its maximum prior to the convectively active phase. Furthermore, the budget analysis of column-integrated moist static energy reveals that the surface latent heat flux variability destabilizes MJO while it tends to slow down phase progression of MJO.

Free Research Field

気象学