科研之友
微信
新浪微博
Facebook
分享链接
摘要
In this paper an attempt is made to study equatorial Kelvin waves using a network of three radars: Kototabang (0.204 degrees S, 100.320 degrees E) meteor radar, Pameungpeuk (7.646 degrees S, 107.688 degrees E) medium-frequency radar, and Pontianak (0.003 degrees S, 109.367 degrees E) medium-frequency radar. We have used the continuous data gathered from the three radars during April-May 2010. Empirical mode decomposition (EMD), Lomb-Scargle periodogram (LSP) analysis, and wavelet techniques are used to study the temporal and altitude structures of planetary waves. Here, we used a novel technique called EMD to extract the planetary waves from wind data. The planetary waves of similar to 6.5 and similar to 3.6 days periodicity are observed in all three radar stations with peak amplitudes of about 12 and 11 m s(-1), respectively. The 3.6-day wave has an average vertical wavelength from the three radars of about 42 km. The 3.6- and 6.5-day planetary waves are particularly strong in the zonal wind component. We find that the two waves are present at the 84-94 km height region. The observed features of the 3.6- and 6.5-day waves at the three tropical-latitude stations show some correspondence with the results reported for the equatorial-latitude stations.
- 出版日期2018-6-21
