edu.ucar.opensky::articles:22437 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-25T15:37:39.767552 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7wq06tp https://doi.org/10.5281/zenodo.2574994 https Related Dataset #1 Tidal wind data at Syowa Vertical structure of terdiurnal tides in the Antarctic MLT Region: 15-year observation over Syowa (69°S, 39°E) 2019-03-16T00:00:00Z publication https://n2t.org/ark:/85065/d7wq06tp https://doi.org/10.1029/2019GL082155 Liu, H. author Tsutsumi, M. author Liu, Hanli author UCAR/NCAR - Library publisher The terdiurnal tide (TDT) in the Antarctic mesosphere and lower thermosphere region is poorly known. This study examines TDT using neutral wind observations at Syowa during years of 2004-2018. TDT is found to be a significant tidal component with distinct vertical structures and seasonal evolution. (1) It shows a prominent height-dependent seasonal variation with phase reversal at 94 km. (2) The vertical wavelength in summer is similar to 40 km shorter than in winter. These features differ largely from those in the Arctic, indicating hemispheric asymmetry. The phase structure reveals a dominant upward propagating mode in local summer but superposition of more than one mode in other seasons. A downward propagating mode above 94 km in winter suggests Joule heating/ion drag as additional tidal sources to lower atmosphere ones. These results provide new constrains and benchmarks for model simulations that seek to understand terdiurnal tidal forcing mechanisms in polar regions. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright 2019 American Geophysical Union. None eng geoscientificInformation