成層圏オゾンの全球的輸送に関する研究

平流层臭氧全球输送研究

• 批准号: 02044078
• 负责人: HIROTA Isamu
• 金额: $ 2.75万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for international Scientific Research
• 财政年份: 1990
• 资助国家: 日本
• 起止时间: 1990 至 1991
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02044078/
• 关键词: Stratospheric ozone; SBUV data; TOMS data; Equatorial Kelvin wave; Semiannual oscillation; Quasi-biennial oscillation; ENSO cycle; SBUVオゾンデ-タ; TOMSオゾンデ-タ; ENSO

Long-term variations in stratospheric ozone are investigated by using the ozone mixing ratio data from the solar backscatter ultraviolet (SBUV) and the total column ozone data from the total ozone mapping spectrometer (TOMS) on board the Nimbus 7 satellite.From a simple photochemical consideration, it is expected that ozone variations in the upper stratosphere are associated with temperature disturbances. Using the SBUV data, clear evidence is presented for the appearance of equatorially trapped "ozone Kelvin waves" above the 10 mb level having a zonal wavenumber one component and an eastward migration period of about 7 days. Statistical results for the SBUV ozone data over the 8 years shows how Kelvin wave amplitudes are closely related to the semiannual oscillation of the zonal mean wind around the stratopause level. Further discussions are made on the effect of the quasi-biennial oscillation (QBO) of the tropical lower stratosphere on the vertical propagation of fast Kelvin waves, which results in the QBO modulation of the mean field around the stratopause level.Equatorial total ozone variations are described, using 11 years of the TOMS data. Over the equator, an annual cycle in total ozone is conspicuous. The longitudinal structure shows a zonal wavenumber one pattern with minimum values in the western Pacific, indicating a close relationship to vigorous convective activity there. By removing the climatological annual cycle from the original data, there appears the QBO in total ozone. This variation is strongly coupled with the equatorial zonal-wind QBO. Moreover, subtracting zonal mean values from the anomaly data, we see an east-west seesaw variation with a nodal longitude around the date line. This east-west variation, having a characteristic time-scale of about four years, is clearly related to the El Nino and the Southern Oscillation (ENSO) cycle, which involves variations in convective cloud activity.

利用太阳后向散射紫外线（SBUV）的臭氧混合比数据和光轮7号卫星上的总臭氧测绘光谱仪（TOMS）的总柱臭氧数据，研究了平流层臭氧的长期变化。从简单的光化学角度考虑，预计平流层上层的臭氧变化与温度扰动有关。利用SBUV资料，提供了明确的证据，证明在10mb高度以上出现了赤道捕获的“臭氧开尔文波”，具有纬向波数1分量和大约7天的东移周期。对SBUV 8年臭氧数据的统计结果表明，开尔文波振幅与平流层周围纬向平均风的半年振荡密切相关。进一步讨论了热带平流层下层准两年一次振荡（QBO）对快速开尔文波垂直传播的影响，从而导致平流层顶附近平均场的QBO调制。利用TOMS 11年的数据，描述了赤道臭氧总量的变化。在赤道上空，臭氧总量的年循环是明显的。纵向结构表现为纬向1波数型，在西太平洋值最小，表明与那里的强对流活动密切相关。从原始资料中去掉气候年循环，臭氧总量出现了QBO。这种变化与赤道纬向风QBO强烈耦合。此外，从异常数据中减去纬向平均值，我们看到东西向的跷跷板变化与节点经度围绕日期线。这种东西向的变化，具有大约四年的特征时间尺度，显然与厄尔尼诺和南方涛动（ENSO）周期有关，后者涉及对流云活动的变化。

项目成果

I.Hirota: "Midwinter warmings in the southern hemisphere Stratosphere in 1988" Q.J.R.Meteorol.Soc.116. 929-941 (1990)

I.Hirota：“1988 年南半球平流层仲冬变暖”Q.J.R.Meteorol.Soc.116。

I.Hirota: "Kelvin waves near the Equatorial Stratopause as seen in SBUV Ozone data" J.Meteor.Soc.Japan. 69. 179-186 (1991)

I.Hirota：“SBUV 臭氧数据显示赤道平流层附近的开尔文波”J.Meteor.Soc.Japan。

I.Hirota: "Kelvin waves near the equatorial Stratopause as seen in SBUV ozone deta" J.Met.Soc.Japan. (1991)

I.Hirota：“在 SBUV 臭氧层中看到的赤道平流层附近的开尔文波”J.Met.Soc.Japan。

M.Shiotani: "Annual,Quasi-biennial and ENSO time-scale Variations in Equatorial Total Ozone" J.Geophy.Res.97. (1992)

M.Shiotani：“赤道总臭氧的年度、准两年期和 ENSO 时间尺度变化”J.Geophy.Res.97。

I. Hirota: "Kelvin waves near the Equatorial Stratopause as seen in SBUV Ozone data" J. Meteor. Soc. Japan. 69. 179-186 (1991)

I. Hirota：“在 SBUV 臭氧数据中看到的赤道平流层附近的开尔文波”J. Meteor。