赤道加热对大气波动的影响

研究了赤道大气加热对大气波动的影响，结果表明：(1)赤道加热可以产生赤道对称的定常气压波动，其强度与加热特别是凝结加热密切相关；(2)当加热强度变化时，可激发产生东移的开尔波和西移的Hossby波重力波。     

高空急流与重力内波

讨论了高空急流下重力内波的发展过程,结果表明：当稳定必数小时,急流可向内波扰动提供能量,使内波得以发展。在引入时空缓变量后,得到了弧立子解,这对于解释某些中尺系统的强烈发展具有一定的意义。     

Airglow observation by Fabry-Perot interferometer

An all-sky and a scanning Fabry-Perot interferometers (FPI) have been developed for observations of vertical winds and two-dimensional atmospheric motions in the low-thermosphere and the mesosphere region by the measurement of Doppler shift and broadening of airglow emission lines. The system of FPI is described and the method of data analysis is proposed, an example of observation is also given. Ai Yong: born in 1958, Ph.D graduate student     

赤道大气耦合运动的行波解和孤波解

本文讨论了耦合强迫下的赤道大气运动,求得其行波解和孤波解。     

重力波波包在水平风场中非线性传播的数值模拟——I．水平风场为均匀风场

采用全隐欧拉格式(FICE)对重力波波包在均匀风场中的三维非线性传播进行了数值模拟,给出了波包在三维空间中非线性传播的过程,分析了重力波的传播特性及风场对重力波传播的影响。计算结果表明：波振幅随高度的增加而增长,但比线性条件下的指数增长要慢;波包非线性传播的路径和能量传输速度不同于线性重力波理论给出的结果,非线性效应在顺风场中比在逆风场中更显著;风场会改变重力波传播的路径和速度。     

重力波波包在水平风场中非线性传播的数值模拟--Ⅱ.水平风场为非均匀风场

采用全隐欧拉格式(FICE)对重力波波包在非均匀风场中的三维非线性传播进行了数值模拟,给出了波包在三维空间中非线性传播的过程．分析了重力波的传播特性及风场对重力波传播的影响．计算结果表明：波振幅随高度的增加而增长．但比线性条件下的指数增长要慢;重力波在剪切风场中非线性传播时垂直波长随高度的增加而减小。     

Study on wavy distribution of rainfall associated with typhoon Matsa （2005）

An analysis is made to investigate the structure features of the extensive heavy rainfall left by typhoon Matsa, after its landfall in mainland China in August 2005, based on a range of observational results, including surface intensive observation data, TBB data from China's FY-2 satellite, and NCEP 1°×1° reanalysis data. The study tries to explore the interaction between atmospheric waves, 3-D atmospheric structures, and typhoon rainbands. Observational facts, diagnostic analysis, and atmospheric wave theory are used to look into the formation mechanism of distant typhoon rainbands. Results show that (1) Matsa rainbands have the features of noticeable wave train distribution and long distance propaga-tion; (2) the typhoon rainbands extend as far as 2000 km northwardly from the typhoon center, with a wavelength of 500―1000 km and a wave period of 12―24 h; (3) the wave structure of Matsa rainbands is closely associated with the corresponding wave variation of the ambient 3-D atmospheric structures, including disturbance vorticity, divergence field, vertical motion field, water vapor flux divergence field, etc. (4) both observational facts and theoretical analysis show that the northward extending typhoon rainbands are associated with the mixed effects of atmospheric inertia wave and internal gravity wave; (5) only under proper atmospheric stratification and vertical wavenumber of gravity wave, can a ty-phoon stimulate such a wave being able to reach such a distance, and result in extending wavy rain-bands.     

Gravity wave activity and spectra in the upper mesosphere at Wuhan, China during early March 1996

Sodium layers (75–105 km) were measured by Na lidar on three nights from 1 to 3 of March 1996. The lidar data were used to calculate the relative atmospheric density perturbations and their spectra. The average r. m. s. density perturbations for early March at Wuhan are 5%. The Vertical wave number spectra exhibit power-law shapes with an average slpoes of −2. 12 in the upper mesosphere when the associated density mean quantity of the day was used. Supported by the Fundation of Chinese Academy of Science Ai Yong: born in 1958, Ph. D. graduate student     

Gravity wave activity and spectra in the upper mesosphere at Wuhan, China during early March 1996

Sodium layers (75–105 km) were measured by Na lidar on three nights from 1 to 3 of March 1996. The lidar data were used to calculate the relative atmospheric density perturbations and their spectra. The average r. m. s. density perturbations for early March at Wuhan are 5%. The Vertical wave number spectra exhibit power-law shapes with an average slpoes of −2. 12 in the upper mesosphere when the associated density mean quantity of the day was used. Supported by the Fundation of Chinese Academy of Science Ai Yong: born in 1958, Ph. D. graduate student     

基于改进ICA算法对云南地区重力固体潮中地震前兆信息的提取与识别

固体潮信号是地球自转在月球和太阳作用下产生的混合复杂信号,其中包含大量的谐波分量,而实际重力固体潮信号中包含了丰富的地震前兆信息.该文提出一个重力固体潮信号的正交分解模型,通过将重力固体潮信号谐波分量,分解在两个正交的方向上,以提取独立的谐波分量：半日波信号、日波信号、长周期波信号.在重力固体潮地震前兆信息分析中引入ICA算法,结合ICA的自身的特点进行算法优化,对重力固体潮信号中包含的三类谐波进行提取.通过对重力固体潮信号中包含的长周期波的分析,研究长周期波的时序变化特征,从中读取其包含的震颤异常波从而提取地震前兆信息.通过对云南地区的实际震例分析表明,长周期波在地震前后的确存在异常变化特征量,此类异常变化常出现在地震前和地震后大约30 d左右.得到的时序特征量的变化容易观察,对于地震前兆信息的分析具有明确的物理意义.     

GPS radio occultation: A potential new data source for improvement of antarctic pressure field

Radio occultation technique, first demonstrated by the GPS/MET experiment in 1995[1], has the potential to provide improved spatial and temporal resolution in the probing of the Earth's neutral atmosphere, including pressure,temperature and water vapor profiles, in addition to traditional measurements (e.g.,radiosonde, spaceborne radiometers) and ground-based GPS networks for precipitable water vapor (PWV) measurements. This paper provides an overview of the radio occultation concept and retrieval procedure and current technical limitations including lower troposphere inhomogeneities, signal penetration, multipath, and water vapor ambiguity. The current limitations using atmospheric model pressure fields (ECMWF and NCEP) for the modeling of atmospheric mass load over Antarctica, for its separation from climate sensitive signals observed by gravity mapping satellite,GRACE, are quantified. Atmospheric pressure fields over Antarctica are poorly known and higher temporal variability of pressure causes an "aliasing" error in GRACE-observed climate-sensitive signals such as hydrology, mass balance and oceanic mass variations. In particular, comparison of ECMWF 6-hour data with the Automatic Weather Station (AWS) in Antarctica indicates mean differences of 5 hPa,and rms of 1.7 hPa, exceeding the accuracy requirement for GRACE. Aliasing effec tmanifests as high-frequency errors in GRACE-observed gravity signals and are more pronounced over Antarctica. The possibility of using current operating satellite(SAC-C, CHAMP and GRACE) occultation data to improve Antarctic surface pressure fields is proposed. Preliminary results indicate that in the absence of water vapor over Antarctica, retrieved CHAMP pressure profile agrees well with radiosonde data from Neumayer station, and that occultation signals reach near the surface.     

二维诱生引力的量子宇宙学波函数

本文用超空间方法对其有宇宙学常数的二维诱生引力进行量子化。我们用等效约束方法精确求解了宇宙波函数Ｗｈｅｅｌｅｒ－Ｄｅｗｉｔｔ方程，并且讨论了波函数的行为。