JpGU-AGU Joint Meeting 2017

講演情報

[EE] ポスター発表

セッション記号 A (大気水圏科学) » A-OS 海洋科学・海洋環境

[A-OS16] [EE] 地球規模環境変化に関する分野横断の海洋研究

2017年5月22日(月) 13:45 〜 15:15 ポスター会場 (国際展示場 7ホール)

コンビーナ:河宮 未知生(海洋研究開発機構)、伊藤 進一(東京大学大気海洋研究所)、栗原 晴子(琉球大学)、見延 庄士郎(北海道大学大学院理学研究院)

[AOS16-P07] Influences of coastal upwelling on the regional winds system off east Vietnam

*Zhe-Wen Zheng1 (1.National Taiwan Normal University, Institute of Marine Environmental Science and Technology)

キーワード:coastal upwelling, sea-breeze, air-sea interaction, WRF

The impacts of coastal upwelling off southeast Vietnam (CUEV) on local wind field using numerical simulations are elucidated based on atmospheric model of Weather Research and Forecasting (WRF). Several scenarios are simulated by forcing identical model configurations with different SST fields. Based on simulation outputs, the relationship between CUEV and reduction of wind forcing is identified. The local wind speeds can drop to less than 70% of original level while the influence of a typical cold patch with a temperature drop attains to 3-5 °C. We find that the mechanism of response of the wind reduction to CUEV is associated with the enhancement of sea-breeze driven wind modulation. Onshore sea-breeze will enhance, while the contrast between land and sea is even more striking due to the contribution of a distinct coastal upwelling. This implies that air-sea-land interaction dominates the process of local wind system modulation in response to transient CUEV. This result sheds a new light on the air-sea interaction process off southeast Vietnam.