Studies on the eguatorial middle atmosphere dynamics.

赤道中层大气动力学研究.

• 批准号: 04452072
• 负责人: HIROTA Isamu
• 金额: $ 4.22万
• 依托单位: KYOTO 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: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04452072/
• 关键词: Quasi-biennial oscillation; Eguatorial waves; Kelvin waves; Rossby-gravity waves; Internal gravity waves; Short-period disturbances; 内部動波; 赤道成層圏; 平均東西風

A statistical analysis was carried out of short-period disturbances in the equatorial lower stratosphere, with use of balloon observations at Singapore (lN,104E) for 15 years of 1978 - 1993. It is found that internal waves having a period of about 2 days are dominant independently from the well-known longer-period waves such as Kelvin waves and Rossby-gravity waves. Results of long-term statistics show that these short-period waves are strongly connected with the QBO.Space-time variations of atmospheric temperature in the equatorial lower stratosphere ax investigated using temperature data derived from UARS-CLAES observations for January 1992 to May 1993. During this period, clear evidence of Kelvin waves is observed for eastward progression of zonal wavenumber 1 temperature anomalies. The Kelvin wave activity is vigorous during the easterly regime, but rapidly decreases in the westerly regime of the QBO.Response of the atmosphere to transient localized heating in the tropics is studied theoretically and nemerically. The method of separation of variables is used to analyze the linearized primitive equations. Dependence of the wave excitation on several parameters of the heating is clarified. Time-integrations of a full nonlinear model with accurate radiative calculations are also done to investigate the propagation of excited waves in some climatological basic states including two opposite QBO phases.Laboratory experiment of QBO done by Plumb and McEwan (1978) was double cheked using same size of apparatus. The formation of mean flow and its reverse were confirmed. The period of reverse, however, was very sensitive to the stratification of narrow region at the source of wave, and varied significantly.

利用新加坡（lN,104E） 1978 - 1993年15年的气球观测资料，对赤道平流层下层的短周期扰动进行了统计分析。发现周期约为2天的内波独立于众所周知的更长的周期波，如开尔文波和罗斯比重力波，占主导地位。长期统计结果表明，这些短周期波与QBO密切相关。利用1992年1月至1993年5月的UARS-CLAES观测资料，研究了赤道平流层低层大气温度的时空变化。在此期间，观测到开尔文波的明显证据表明纬向1波数温度异常向东推进。开尔文波活动在QBO的东风区活跃，但在西风区迅速减弱。从理论上和数值上研究了热带地区大气对局部瞬态加热的响应。采用分离变量的方法对线性化的原始方程进行分析。阐明了波激励对加热几个参数的依赖性。用精确的辐射计算对全非线性模型进行了时间积分，研究了激发波在一些气候基本状态下的传播，包括两个相反的QBO相位。用相同尺寸的仪器对Plumb和McEwan（1978）所做的QBO实验室实验进行了双重检验。证实了平均流的形成及其反向。反转周期对波源处狭窄区域的分层非常敏感，变化显著。

项目成果

Sato,K.,Hasegawa,F.and Hirota,I.: "Short-period disturbances in the eguatorial lower stratosphere." J.Met.Soc.Japan. 72. 423-432 (1994)

佐藤，K.，长谷川，F.和广田，I.：“赤道低平流层的短期扰动。”

I.Hirota: "Dynamics of the Equatorial Middle Atmosphere." Proceeding of the 4-th International Symposium on Equatorial Atmosphere Observations over Indonesia.(1992)

I.Hirota：“赤道中层大气的动力学。”

塩谷雅人,J.Gille,A.Roche,J.Kumer: "UARS-CLAESデータから検出された下部成層圏赤道ケルビン波について" 第8回大気圏シンポジウム. 32-35 (1994)

Masato Shioya、J. Gille、A. Roche、J. Kumer：“根据 UARS-CLAES 数据检测到的低平流层赤道开尔文波”，第八届大气研讨会（1994 年）。

T.Horinouchi and S.Yoden: "Wave excitation by localized heating in the tropics and its propagation in the middle atmosphere." Proceeding of Eighth International Symposium on Solar Terrestrial physics. 203. (1994)

T.Horinouchi 和 S.Yoden：“热带地区局部加热引起的波激发及其在中层大气中的传播。”

Shiotani,M.and Hasebe,F.: "Stratospheric ozone variations in the equatorial region as seen in SAGE data." J.Geophys.Res.(1994)

Shiotani,M. 和 Hasebe,F.：“SAGE 数据中看到的赤道地区平流层臭氧变化。”