Development of Kyushu University Atmosphere-Ocean General Circulation Model and Research of Climate

九州大学大气-海洋环流模型的开发与气候研究

基本信息

批准号：
63460045
负责人：
MIYAHARA Saburo
金额：
$ 3.84万
依托单位：
Kyushu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1990
项目状态：
已结题

项目摘要

The objective of this project is to develop the Kyushu University Atmosphere-Ocean general circulation model, and to investigate the short term climatic changes such as El nino and ENSO. The research of this project has been done by two different methods.At first, in order to understand the theoretical background of the coupled ocean-atmosphere dynamics, a simplified atmosphere-ocean coupled model is constructed by using Anderson-McCreary type ocean model and Gill type atmosphere model. Several numerical simulations have been done to investigate the necessary condition for generating the Elnino. It is found that the high oceanic heat content in the westem Pacific and the westerly burst over the western Pacific are the necessary condition for the generation of the El nino. Some numerical integrations have also been done to simulate the ENSO cycle. The model used in these integrations consists of a limited ocean surrounded by lands imitating the Pacific Ocean. An external land heating we … More st of the Pacific is added to simulate the land heating associated with the monsoon. The repetitious generation of the coupled disturbance has nothing to do with the linear model of Hirst (1988) as well as off-equatorial Rossby waves. It is perfectly determined by the amplitude of the external land heating. The mass budget analysis demonstrates that the change of zonal wind direction in the western Pacific, which is due to relative importance between the external land heating and the heating associated with the previous coupled disturbance, modulates the oceanic heat content relevant to the origin of the following coupled disturbance. This mechanism gives the oscillation between two stable equilibria (La Nina and El Nino), which are very different from those described in Battisti (1988), Schopf and Suarez (1987), and Zebiak and Cane (1987). Despite lots of model limitations, the present results seem to be compatible with the recent analyses of the air-sea-land system in the western Pacific.A numerical experiment has been performed using a coupled ocean-atmosphere model in order to examine possible relationships between the atmospheric intraseasonal oscillation and the air-sea coupled interannual disturbance. The model is composed of a T21 atmospheric general circulation model and a simple ocean model. When the ocean is kept motionless with a fixed SST, intraseasonal oscillation is reproduced in the atmosphere. When the ocean is replaced by the active one, the intraseasonal oscillation becomes rather sporadic both in space and time over the warm ocean region produced by the ocean-atmosphere interaction. The mean structure of this warm SST region is very similar to that obtained by the simple coupled ocean-atmosphere model. However, The coupled disturbance in this model has a multi-scale structure having both intraseasonal and interannual modes. Less

该项目的目的是开发九州大学气氛 - 海洋通用循环模型，并研究诸如El Nino和Enso之类的短期晶体变化。该项目的研究是通过两种不同的方法进行的。首先，为了了解耦合的海洋 - 大气动力学的理论背景，通过使用Anderson-Mccreary Type海洋模型和Gill类型大气模型来构建一个简化的大气 - 海洋耦合模型。已经进行了几个数值模拟来研究生成Elnino的必要条件。发现西部太平洋和西太平洋的西部爆发的海洋热含量高是产生埃尔尼诺的必要条件。还进行了一些数值集成以模拟ENSO循环。这些整合中使用的模型由模仿太平洋的土地周围有限的海洋组成。添加了一个外部土地加热我们…更多的太平洋st，以模拟与季风相关的土地加热。耦合灾难的重复一代与赫斯特（Hirst）的线性模型（1988）以及赤道罗斯比（Rossby Wave）无关。它由外部土地加热的放大器完美地确定。大规模预算分析表明，西太平洋地区的区域风向的变化是由于外部土地供暖和与先前耦合灾难相关的供暖之间的相对重要性，它调节了与以下耦合灾难的起源相关的海洋热含量。这种机制给出了两个稳定的平衡（La Nina和El Nino）之间的振荡，这与Battisti（1988），Schopf和Suarez（1987）以及Zebiak and Cane（1987）中所述的机制截然不同。尽管有很多模型限制，但目前的结果似乎与西太平洋中空气 - 地带系统的最新分析兼容。已经使用耦合的海洋 - 大气模型进行了数值实验，以研究大气内际振荡与空气海上搭配的临时灾难之间的可能关系。该模型由T21大气通用循环模型和简单的海洋模型组成。当海洋用固定的SST保持一动不动时，季节内振荡将在大气中繁殖。当海洋被活跃的海洋所取代时，季节内振荡在海洋 - 大气相互作用产生的温暖海洋区域的时空和时间上都变得相当弹性。该温暖的SST区域的平均结构与简单耦合的海洋 - 大气模型获得的平均结构非常相似。但是，该模型中造成的灾难具有多尺度结构，具有季节室和际地模式。较少的