Forcing Mechanism of Normal Mode Rossby Waves

简正模罗斯贝波的强迫机制

• 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

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.

正常模式的罗斯比波（Rossby Wave）是向西行驶的大气中，其特征周期为5-20天。本研究包括分析通过使用一般循环模型（GCMS）通过卫星测量获得的观察到的数据。1基于观察到的数据的分析结果：（1）5天和10天波的全球结构首先，通过使用NASA获得的UARS/ISAMS数据在Mesosphere中显示。（2）5天和10天的波逐渐在上层中的高度均逐渐为高度；但是，10天的波在冬季半球中具有较大的振幅。2基于GCM模拟的结果：（1）模拟的5天波的垂直和水平结构与观察到的垂直和水平结构非常相似，并且不规则地表现出大约一个月的生命周期。（2）对5天波和降水的详细分析表明，当Zonal波数1的降水场中的异常较大时，5天的波活性在很大程度上会增强，而向西的时间很大。3（3）（3个）（3个（3）。 ）5天的波浪也出现在没有山脉和/或没有陆地对比的条件下；因此，这些可能对波浪的激发不重要。但是，在去除潜热量的情况下，5天的波动活动明显较弱。

项目成果

A.Kohsiek: "Periods of planetary waves in geomagnetic variations" Ann.Geophysicae. 13. 168-176 (1995)

A.Kohsiek：“地磁变化中的行星波周期”Ann.Geophysicae。

三好勉信: "大気大循環モデル中のノーマルモード・ロスビー波の構造と出現特性について" 大気圏シンポジウム. 10. 13-16 (1996)

三好勉信：“论大气环流模式中正态罗斯贝波的结构和表现特征”，大气研讨会，10. 13-16 (1996)。