低纬电离层无线电波冬季吸收特性与中层大气动力学

低纬电离层无线电波冬季吸收特性与中层大气动力学 THE CHARACTERISTICS OF THE WINTER ABSORPTION OF THE RADIO WAVE OF THE IONOSPHERE AT THE LOWER LATITUDE AND THE MESOSPHERIC ATMOSPHERE DYNAMICS 熊年禄 first-author 龙咸灵 张训械 本文叙述了1982/83年冬季及1983/84年冬季所测的无线电波信号吸收实验结果。结合MAP第一个冬季动力学报告及本地大气层探空气象资料,对82/83年冬季的三次吸收峰值进行初步讨论。在平流层30mb上未发生温度梯度反转,不产生子午环流时,吸收影响主要来自70km左右由行星波上传产生的温升。当发生温度梯度反转,产生子午环流时,由北向南输送NO是产生低纬冬季吸收增大的主要原因。另外,本文也提出风剪变面上KH不稳定性产生的能量传输也可能会影响低纬冬季吸收。吸收中的准两年现象及4—5天周期波扰动存在显示了低纬"冬季吸收反常"的特点。 The experimental results of the radio wave absorption observed during the winter of 1982/83 and 1983/84 have been described in this paper. Combining with the first winter of MAP-Dynamics, 1982/83 and the meteologycal data of local atmospheric sounding, three peaks of the absorption appeared during the winter of 1982/83 have been discussed primarily. The effects on the absorption mainly caused from a warming due to propagating upwards planetary waves to about 70km when the reverse of the temperature gradient not occured on the stratosphere 30 mb isobar surface and a meridional circule not produced. When the temperature gradient reversed and the meridional circule have been produced the transportation of NO from north to souuth was a main cause produced an increasing absorption. Otherwise, it suggests in the paper that the transportation of an energy due to K-H instability produced at a shear surface could also effect the winter absoption The exis tence of the quesi-biennial periods and the turbulences with 4—5 day periods in the absorption showed some characteristics of the winter anomaly above the lower latitude. 中国科学院科学基金 1985-04-01 2021-04-01 4