DYNAMICAL STUDIES ON THE FORMATION OF PLANETARY WAVES.

行星波形成的动力学研究。

基本信息

批准号：
13640440
负责人：
HIROOKA Toshihiko
金额：
$ 0.9万
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：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

Throughout the current study, we have investigated the formation mechanism of stationary and traveling planetary waves on the basis of meteorological reanalysis data along with general circulation model simulations.As regards the traveling planetary waves) interannual variability of the 5-day wave in the stratosphere has been examined by the use of the National Center for Environmental Prediction (NCEP)/ National Center for Atmospheric research (NCAR) reanalysis data. We have found the quasi-biennial variation of the 5-day wave amplitude in the stratosphere. This quasi-biennial variation is closely related to the zonal wind variation associated with the quasi-biennial oscillation (QBO) in the equatorial stratosphere : The 5-day wave amplitude during the easterly shear phase of the QBO is larger than that during the westerly shear phase.On the other hand, the Arctic Oscillation, whose spatial pattern shows a seesaw between the Arctic and mid-latitudes, has been widely discussed concerning the interannual variability of the general circulation. The AO is considered to be closely related to the variability of stationary planetary waves. We have investigated the relationship among the AO, the North Atlantic Oscillation (NAO) and the Pacific and North American (PNA) oscillation pattern on the basis of the NCEP/NCAR reanalysis data. As a result, we have found that the observed AO is almost apparent and two almost independent seesaws, i.e. the NAO and the PNA oscillation pattern, reconstructed from the observed data apparently reproduce the AO.

在当前的整个研究中，我们已经根据气象重新分析数据以及一般循环模型模拟研究了固定和行星行星波的形成机理。通过使用国家环境预测中心（NCEP）/国家大气研究中心（NCAR）重新分析数据来检查。我们发现平流层中5天波幅度的准生物生物变化。这种准双年生变化与赤道平流层中与准生物振荡（QBO）相关的区域风变化密切相关：QBO的东剪切阶段的5天波振幅大于在西风剪切中的剪切阶段。另一方面，北极振荡的空间模式显示了北极和中纬度之间的seesaw，已经广泛讨论了有关一般循环的年度变异性的广泛讨论。 AO被认为与固定行星波的变异性密切相关。我们根据NCEP/NCAR重新分析数据研究了AO，北大西洋振荡（NAO）以及太平洋和北美（PNA）振荡模式之间的关系。结果，我们发现观察到的AO几乎是显而易见的，并且两个几乎独立的Seesaws，即NAO和PNA振荡模式，从观察到的数据显然重现了AO。