日本地球惑星科学連合2023年大会

講演情報

[E] オンラインポスター発表

セッション記号 A (大気水圏科学) » A-AS 大気科学・気象学・大気環境

[A-AS01] 大気の鉛直運動を基軸とした地球環境学の新展開

2023年5月22日(月) 09:00 〜 10:30 オンラインポスターZoom会場 (1) (オンラインポスター)

コンビーナ:佐藤 正樹(東京大学大気海洋研究所)、佐藤 薫(東京大学 大学院理学系研究科 地球惑星科学専攻)、丹羽 洋介(国立環境研究所)、岡本 創(九州大学)

現地ポスター発表開催日時 (2023/5/21 17:15-18:45)

09:00 〜 10:30

[AAS01-P01] Fine-scale features in vertical velocity represented in a global cloud-resolving coupled model

*升永 竜介1宮川 知己2 (1.海洋研究開発機構、2.東京大学大気海洋研究所)

Deep convection frequently occurs in the tropical region owing to its high sea-surface temperature (SST). Although SST is relatively cold over the extra-tropical regions, intense updraft can be induced by tropical cyclones and atmospheric fronts. Also, recent studies argued that mesoscale ocean features, including Tropical Instability Wave, western boundary current and ocean eddies, can locally induce updraft that reaches the tropopause level. In the present study, we conducted global 10 ensemble simulations with an atmosphere and ocean coupled model to investigate the resolution dependence of fine-scale updraft features and its relation to SST. The horizontal resolution of the atmospheric model is either 14 km or 3.5 km, and that of the ocean model is 0.1 degrees. The sets of simulations were conducted over 40 days for midwinter in 2020 and midsummer in 2016.
Regardless of the horizontal resolution, the coupled model well resolves the intense ascent associated with cold atmospheric fronts in winter and typhoons in summer. Furthermore, updraft is intensified in the vicinity of steep SST fronts associated with the mesoscale ocean features, as consistent with the previous studies, in both resolutions. On the scale of O(100km), the horizontal feature of updraft is largely consistent between the resolutions. However, the higher-resolution model represents much finer updraft features with the horizontal scale of O(10km) and finer. Precipitation exhibits finer features as well. Thus, global atmosphere models with horizontal resolution of O(1km) can shed new light on the role of fine-scale updraft in the global climate and weather system.

Acknowledgements: This work was supported by MEXT as “Program for Promoting Researches on the Supercomputer Fugaku” (JPMXP1020200305) (Project ID: hp200128/hp210166/hp220167), and by JSPS KAKENHI Grant Number JP19H05703.