[A-AS02] High performance computing of next generation weather, climate, and environmental sciences using K

[AAS02-P06] 固定アンビル温度仮説の上層雲サイズへの依存性

★招待講演

*野田 暁¹、清木 達也¹、佐藤 正樹¹、山田 洋平¹ (1.海洋研究開発機構)

キーワード：気候変動、全球雲解像シミュレーション、上層雲

The applicability of the fixed anvil temperature (FAT) hypothesis is examined using data of a global non-hydrostatic model, focusing particularly on high cloud size dependency. Decomposition of outgoing-longwave radiation (OLR) into three components, including cloud-top temperature (T_CT), upward cloud emissivity (ε), and clear-sky OLR (F^CLR), reveals that the relative contributions of these three components to changes of OLR are highly dependent on cloud size. That is, the FAT hypothesis is applicable only to smaller clouds, because the contribution of T_CT by those clouds is small, and ε is more important. In contrast, for larger clouds, the contribution of ε is comparable to that of T_CT, and thus, both components are equally important. F^CLR slightly reduces OLR, but shows dependence on cloud size.