The Spatiotemporal Variability of Non‐Migrating Tides in the Zonal Wind Component Detected From TIMED/TIDI Observations

Abstract

AbstractWith Doppler Interferometer instruments on thermosphere‐ionosphere‐mesosphere energetics and dynamics satellite (TIMED/TIDI) observations, the 1‐day resolution, non‐migrating DE3 tide in the zonal wind component can be extracted using the method from Li et al. (2015, https://doi.org/10.1002/2015JA021577). This paper presents the spatiotemporal variability of the DE3 tide in the zonal wind component between 85 and 105 km altitude and within ±30° latitude. The global structure and long‐term variation (intra‐annual and >1 year variability) are similar to the previous results. It is found that (a) it is dominant in the Southern Hemisphere between 95 and 105 km altitude and in the Northern Hemisphere between 90 and 100 km altitude; (b) the maximum amplitudes are in August and September around the equator, and the phases are stable and hardly vary with their latitudes; and (c) the influence of the quasi‐biennial oscillation (QBO) phenomenon can be noticeably detected. Additionally, the short‐term variability (after filtering out long‐term variability) can also be presented: (a) it increases with altitudes gradually between 85 and 105 km altitude, and the peak value is above 100 km; and (b) the short‐term variability does not demonstrate significant long‐term variation. Furthermore, through comparative analysis, we found that (a) the long‐term variations in DE3 in temperature and zonal wind are consistent with each other; however, the short‐term variabilities in DE3 are not similar. This indicates that the dominant dynamic processes of DE3 in the temperature and zonal wind components are different. (b) The symmetric DE3 tide in the zonal wind component is dominant at 0°–15° latitudes, and the asymmetric tide is dominant at 15°–30° latitudes. This indicates that the DE3 tide at different latitudes is dominated by wave modes with different symmetries.