Zonally uniform tidal oscillations in the tropical stratosphere. Issue 21 (14th November 2015)

• Record Type: Journal Article
• Authors: Sakazaki, Takatoshi; Sasaki, Takuya; Shiotani, Masato; Tomikawa, Yoshihiro; Kinnison, Douglas
• Is Part Of: Geophysical research letters. Volume 42:Issue 21(2015:Nov.)
• Page Start: 9553
• Page End: 9560
• Publication Date: 2015-11-14
• Subjects: Tides -- Nonmigrating tides -- Zonally‐uniform tides -- Wavenumber zero -- Brewer‐Dobson Circulation -- CCM; Geophysics -- Periodicals; Planets -- Periodicals; Lunar geology -- Periodicals; 550
• DOI: 10.1002/2015GL066054
• Languages: English
• ISSNs: 0094-8276

Abstract

Abstract: By analyzing data from satellite measurements, a reanalysis, and a chemistry‐climate model, we found clear zonally uniform tidal signals in the tropical stratosphere, particularly during the Northern Hemisphere summer. Antisymmetric components with respect to the equator are dominant and are characterized by a vertical wavelength of ~15 km and a diurnal frequency. The temperature and vertical wind diurnal amplitudes in the stratosphere are 0.2–1 K and 1–7 mm s –1, respectively. The latter is generally larger than the climatological ascent motion in the stratosphere. The observed latitudinal and vertical structures can be explained by the second, propagating, antisymmetric Hough mode. These tidal oscillations should be carefully considered in analyses of zonal mean fields at a particular universal time. Key Points: Stratospheric zonally uniform tides are clearly observed during the Northern Hemisphere summer The characteristics can be mostly explained by the second, antisymmetric, propagating Hough mode Diurnal variations must be considered when calculating the climatological zonal mean field