Radiosonde observations of equatorial atmosphere dynamics over Indonesia: 1. Equatorial waves and diurnal tides

摘要: This paper describes the characteristics of mean winds, equatorial waves with periods ranging from 4 to 20 days, and diurnal tides determined by analyzing profiles wind velocity, temperature, humidity obtained every 5–7 hours in height range up about 35 km a resolution 150 m during an observation campaign conducted February 27 March 22, 1990, East Java, Indonesia. The structures winds troposphere lower stratosphere seemed be affected Australian monsoon quasi-biennial oscillation, respectively. Frequency spectra indicated that as well were dominant below 25 km, while gravity shorter than days became more significant above km. A 7-day oscillation showing antiphase relation between eastward northward components exhibiting large amplitudes was observed troposphere. time-height variations activity this clearly correlated region high relative humidity. Perturbations zonal temperature wave varying 15 17 also enhanced troposphere, Kelvin 7 detected stratosphere, near tropopause conspicuously enhanced. We found 20-day greatly modified structure tropopause, such minimum height, values Brunt-Vaisala frequency squared N2, which further suggests effects on transportation tropospheric water vapor into downward mixing stratospheric minor constituents compared those numerical model assuming only migrating tides, reasonably agreed Below however, 1–1.5 m/s, exceeding 10 times. Moreover, phase involved fluctuations small vertical scales, suggesting interference many nonmigrating short wavelengths.