E224 熱帯太平洋における 2 次オーダ乱流クロージャー海洋混合層モデル実験

概要

論文の詳細を見る
The comparative experiments for several second-order turbulence closure schemes were conducted under the improved meteorological instrument (IMET) mooring data October, 1992 to March, 1993. The excessive high sea surface temperature (SST), which appears in Mellor and Yamada model under the weak wind stress and strong heating forcings, is improved for that in D'Alessio model. This is because the pressure transport of turbulence energy in D'Alessio model is successfully modeled at the ocean surface. Moreover, the effect of freshwater flux was investigated toward the forecast of SST in the tropical ocean. In the experiments, the "barrier layer" is reproduced well for Noh and D'Alessio models. It is found freshwater flux influences the development of mixed layer after the formation of barrier layer, in particular during the period of strong wind and cooling condition. The difference of SSTs is 0.3°∿0.5℃ between with and without freshwater flux during the IMET observation. Therefore, the freshwater flux may affect the SST forecast of ENSO through the general circulation model.
日本流体力学会の論文
2001-07-31