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Forcing Mechanism of Normal Mode Rossby Waves

简正模罗斯贝波的强迫机制

基本信息

批准号：
07640574
负责人：
HIROOKA Toshihiko
金额：
$ 1.41万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07640574/
关键词：
Rossby wave free wave middle atmosphere satellite data general clrculation model

项目摘要

Normal mode Rossby waves are westward traveling free waves of the atmosphere with characteristic periods of 5-20 days. The present study consists of analyzes of observed data obtained by satellite measurements and numerical simulation by the use of general circulation models (GCMs).1 Results based on analyzes of observed data :(1) Global structures of 5-day and 10-day waves are firstly shown in the mesosphere by the use of UARS/ISAMS data obtained through NASA.(2) Both the 5-day and 10-day waves are gradually with height in the upper mesosphere ; nonetheless 10-day waves have large amplitudes in the winter hemisphere.2 Results based on GCM simulation :(1) Simulated 5-day waves have vertical and horizontal structure very similar to that of observed ones and appear irregularly with a lifetime of about one month.(2) Detailed analyzes for 5-day waves and precipitations show the evidence that 5-days wave activities are inclined to be largely enhanced when anomalies in the precipitation field of zonal wavenumber 1 are large with a westward period of 5 days.(3) 5-day waves also appear in conditions of no mountains and/or no land-sea contrast ; hence these are probably unimportant for excitation of the waves. However, 5-day wave activities are significantly weak in case of removal of the latent heat release.

简正模Rossby波是一种向西传播的大气自由波，其特征周期为5-20天。本研究包括对卫星观测资料的分析和利用大气环流模式进行的数值模拟。1基于观测资料分析的结果：（1）利用NASA提供的UARS/ISAMS资料，首次显示了5天和10天波在中层的全球结构。(2)结果表明：（1）模拟的5日波与观测的5日波具有相似的垂直和水平结构，且不规则，其存在期约为1个月。(2)对5天波和降水的详细分析表明，当纬向波数为1的降水场有较大的向西向周期时，5天波活动有明显增强的趋势。(3)5日波也出现在没有山脉和/或没有海陆对比的条件下;因此这些对于波的激发可能不重要。但在潜热释放消除后，5日波活动明显减弱。