Improvement of Thermocline Structure that Affect ENSO Performance in a Coupled GCM
Improvement of Thermocline Structure that Affect ENSO Performance in a Coupled GCM
复制标题
耦合 GCM 中影响 ENSO 性能的温跃层结构的改进
作者：
Y. Imada;M. Kimoto
许多耦合的大气-海洋环流模式（AOGCM）很难再现厄尔尼诺/南方涛动（ENSO）现象。AOGCM MIROC低估了ENSO变率。本文研究了模拟的ENSO振幅对海洋次表层过程处理的依赖性，由于MIROC模式在垂直扩散计算中包含数值不稳定性，并使用了大的背景扩散系数，次表层海洋中过大的垂直扩散系数干扰了紧密分层温跃层的再现。稳定的数值方案和小的背景扩散系数的引入有助于改善分层。在厄尔尼诺阶段，温跃层的改善增强了温跃层上下的垂直热交换，从而增强了ENSO的振幅。
Many coupled atmosphere-ocean general circulation models (AOGCMs) have difficulty reproducing the El Nino/Southern Oscillation (ENSO) phenomenon. The AOGCM MIROC underestimates ENSO variability. This paper investigates the dependence of the simulated ENSO amplitude on the treatment of ocean subsurface processes.Excessive vertical diffusivity in the subsurface ocean interferes the reproduction of a tightly stratified thermocline because the MIROC model includes numerical instability in the vertical diffusion computation and uses a large background diffusivity. The introduction of a stable numerical scheme and small background diffusivity helped improve the stratification. The improved thermocline enhanced the ENSO amplitude because the vertical heat exchange between above and below the thermocline was enhanced during the El Nino phase.
使用新的海洋混合层模型从 OGCM 模拟更真实的上层海洋过程
DOI：
--
发表时间：
2002
期刊：
J.Phys.Oceanogr. 32
影响因子：
--
作者：
Noh;Y.;C.J.Jang;T.Yamagata;P.C.Chu;C.H.Kim
通讯作者：
C.H.Kim