[A-AS02] [EE] Cloud-Resolving Model Simulations for Cloud-Related Processes in Climate and Weather Studies

[AAS02-06] Suggestions from a global cloud system resolving simulation to global climate model -Transportation of black carbon aerosol to the Arctic-

★招待講演

*佐藤 陽祐¹、三浦 裕亮²、八代 尚¹、五藤 大輔³、竹村 俊彦⁴、道端 拓朗⁴、鈴木 健太郎⁵、中島 映至⁶ (1.理化学研究所計算科学研究機構、2.東京大学大学院地球惑星科学専攻、3.国立環境研究所、4.九州大学応用力学研究所、5.東京大学大気海洋研究所、6.宇宙航空研究開発機構地球観測研究センター)

キーワード：Black carbon aerosol, Cloud system resolving model, Aerosol transpot model

In this study, we investigated effects of horizontal grid resolution on the transportation of black carbon aerosol (BCA) to the Arctic region. BCA in the Arctic has unique and large impact on the climate system through changing the albedo of snow-covered surface as well as absorbing and scattering sunlight. Despite its profound impact, most of the current generation general circulation models (GCM) underestimate BCA in the Arctic. To clarify the reason of the underestimation, the global aerosol transport simulation with kilometer order resolution (3.5km) was conducted. We also conducted sensitivity experiments with coarsening horizontal grid resolution from 3.5 km to 56 km to investigate the impacts of horizontal grid resolution. Our results indicated that BCA mass concentration in the Arctic increased with fining grid resolution, and the BCA mass concentration in the Arctic simulated with the 3.5-km grid resolution was 4.2 times larger than that simulated with a coarse (56-km) grid resolution. The underestimation of BCA was reduced by fining the grid resolution. Results of this study propose that global simulations using kilometre-order or finer horizontal resolution can lead to more accurate estimations of the distribution of BCA in the Arctic and reduce uncertainties regarding the effects of aerosols on global climate. As well as the BCA, we will introduce the several results of global cloud system resolving simulation coupled with aerosol transport model.