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DEVELOPMENT OF MIDDLE ATMOSPHERE GENERAL CIRCULATION MODEL INCLUDING RADIATION PROCESSES

包括辐射过程的中层大气环流模型的开发

基本信息

批准号：
05452079
负责人：
NIYAHARA 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：
1993
资助国家：
日本
起止时间：
1993 至 1995
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05452079/
关键词：
Middle Atmosphere GCM long wave radiation ozone chemical transport ozone hole イオンドラッグダイナモ磁場変動

项目摘要

A radiation scheme developed at Center for Climate System and a rediation scheme developed by Fomichev were incorporated in a middle atmosphere general circulation model at Kyushu University.The former scheme is able to treat the short wave and long wave radiations. Some test runs have been done using a tropospheric-lower stratospheric general circulation model, and it has been confirmed that the GCM can simulate a realistic circulation and temperature distribution.Fomichev's scheme is a long wave radiation scheme treating the LTE and non-LTE radiation in the middle atmosphere. In this project, we have introduced this scheme to treat the long wave radiation in the middle atmosphere and lower thermosphere. The results show that zonal wind around the mesopause becomes strong by introducing the realistic radiation process. This means that we need stronger E-P flux divergence (convergence) to close the zonal wind around the mesopause.An ozone chemical transport process was incorporated to the middle atmosphere GCM,and three dimensional ozone simulation has been conducted to investigate ozone variation in the middle atmosphere and resulting general circulation change. By making an artificial ozone hole in the Antarctic region, variations of temperature distribution and general circulation had been investigated. It is found that temperature decreases around the ozone hole, and it increases above the ozone reduction height. This result is consistent with observations. The temperature change is induced by the changes of the polar night jet, planetary wave activity, and the residual circulation induced by the ozone reduction.

在九州大学的中层大气环流模式中，采用了气候系统中心的辐射方案和Fomichev的辐射方案，前者能处理短波和长波辐射。用对流层-平流层低层大气环流模式进行了试运行，结果表明，该模式能较好地模拟大气环流和温度分布。Fomichev方案是一个处理中层大气LTE和非LTE辐射的长波辐射方案。在本项目中，我们采用这种方案来处理中层大气和低热层的长波辐射。结果表明，引入真实辐射过程后，中层顶附近的纬向风变强。这意味着我们需要更强的E-P通量辐散（辐合）来闭合中层顶附近的纬向风。在中层大气GCM中加入一个臭氧化学输送过程，利用三维臭氧数值模拟研究了中层大气臭氧的变化及其引起的大气环流变化。通过在南极地区制造一个人工臭氧洞，研究了温度分布和大气环流的变化。结果表明，臭氧空洞附近温度降低，臭氧还原高度以上温度升高。这一结果与观测结果一致。这种温度变化是由极地夜间急流、行星波活动以及臭氧减少引起的残余环流的变化引起的。