The tidal displacements of ground-based stations are widely considered in the processing of space geodetic techniques (e.g., SLR and GNSS) for a higher accuracy. One of these tidal displacements is the atmospheric tidal loading (ATL). This loading is usually calculated from the sine and cosine terms of both diurnal S1 and semidiurnal S2 tides. More information can be found in IERS2010 convention and the following reference:
- Ray, R. D. and R. M. Ponte, 2003, Barometric tides from ECMWF operational analyses, Ann. Geophys., 21(8): 1897–1910, doi:10.5194/angeo-21-1897-2003.
An on-line ATL calculator service is kindly provided by T. M. van Dam at the University of Luxembourg and R. Ray at Space Geodesy Branch, NASA Goddard Space Flight Center (GSFC, https://geophy.uni.lu/atmosphere/tide-loading-calculator/).
A similar tidal displacement product is kindly provided by TU Wien
(https://vmf.geo.tuwien.ac.at/). This atmospheric tidal displacement is called the atmospheric pressure loading (APL), which includes two types: tidal and non-tidal displacement. The detailed reference is given as follows.
- D.D. Wijaya, J. Böhm, M. Karbon, H. Krasna, and H. Schuh (2013), Atmospheric pressure loading, Chapter 4 in Atmospheric effects in space geodesy, J. Böhm and H. Schuh (eds), Springer-Verlag Berlin Heidelberg.
My question is what is the difference between ATL and APL. I guess the ATL is the tidal displacement in APL. Thanks in advance for your answers.
The atmospheric pressure loading has causes the elastic deformation of the solid Earth and that is calculated by Tonie van dam using NCEP pressure data. Whilst the atmospheric tides are referring to the global-scale periodic oscillations of the atmosphere wherein it is primarily excited by the Sun's heating within the atmosphere.
Effects and Correction of Atmospheric Pressure Loading ...
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by C Yue - 2020 -
I think these two terms are related to the same geophysical mechanism, the variable distribution of atmospheric mass. The total variability can be represented by a combination of periodic and non-periodic variations.
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