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Impact of atmospheric tides simulated in a chemistry-climate model on sub-diurnal variations in UT1

Authors

Kadow,  C.
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Dobslaw,  Henryk
1.3 Earth System Modelling, 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Matthes,  K.
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Thomas,  Maik
1.3 Earth System Modelling, 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Citation

Kadow, C., Dobslaw, H., Matthes, K., Thomas, M. (2012): Impact of atmospheric tides simulated in a chemistry-climate model on sub-diurnal variations in UT1. - In: Schuh, H., Böhm, S., Nilsson, T., Capitaine, N. (Eds.), - Earth rotation, reference systems, and celestial mechanics: synergies of geodesy and astronomy, Journées 2011 'Systèmes de référence spatio-temporels' (Vienna, Austria 2011) (Vienna 2011).


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_246092
Abstract
Sub-diurnal variations in Earth rotation parameters as obtained from time-series of space geodetic observations contain substantial variability even after correcting for the effects of oceanic tides. These residuals are in particular apparent at frequencies of 1, 2 and 3 cycles per solar day, where atmospheric tides, principally excited by water vapor absorption and ozone heating in the middle atmosphere, are known to occur. By means of hourly data of the chemistry-climate model WACCM, the potential of atmospheric tides on the excitation of UT1 variations is re-assessed. Tidal signals are separated into migrating and non-migrating zonal waves for individual height levels. Only standing waves of wavenumber zero are found to be effective in exciting UT1 variations, which are subsequently discussed in terms of their characteristic surface pressure and vertically varying wind amplitudes.