Table 2
A priori models used in the VIE2020 and VIE2022b solutions.
| A priori modeling | |
|---|---|
| Station a priori position | |
| TRF with post-seismic deformation | ITRF2014 model (1) for VIE2020 |
| ITRF2020 model (2) for VIE2022b | |
| Station displacement | |
| solid Earth tides | IERS Conventions 2010 (3) |
| rotational deformation due to polar motion | secular polar motion (updated IERS Conventions 2010, version 2018-02-01) |
| ocean pole tide loading | IERS Conventions 2010 |
| ocean tidal loading | TPXO72 (4) |
| atmospheric tidal and nontidal loading | APL-VIENNA (5) |
| Earth orientation parameters | |
| *daily EOPs | IERS Bulletin A, finals2000A.all |
| subdaily EOP model | (6) ocean tides + libration; linear interpolation |
| tidal UT variations | IERS Conventions 2010, UT1S all constituents |
| precession/nutation model | IAU 2006/2000A (7), (8) |
| Troposphere | |
| hydrostatic delay | in situ pressure (9) |
| hydrostatic mapping function | VMF3 (10) |
| hydrostatic gradients | DAO gradients (11) |
| *wet mapping function | VMF3 (10) |
| VLBI specific effects | |
| thermal antenna deformation | (12) with in situ temperature and GPT3 as backup |
| antenna axis offsets | (12), antenna-info.txt version 2020-04-23 |
| station eccentricities | ECCDAT v2019Dec19.ecc |
| gravitational antenna deformation | (13) |
| CRF | ICRF3 (14) |
| galactic aberration | modeled with αGC = 266.4°, δGC = −28.94°, Ag = 5.8 µas yr−1, epoch 2015.0 |
Notes. The asterisk denotes a priori models that differ from the models used in our ITRF2020 contribution.
References. (1) Altamimi et al. (2016); (2) Altamimi et al. (2022); (3) Petit & Luzum (2010); (4) Egbert & Erofeeva (2002); (5) Wijaya et al. (2013); (6) Desai & Sibois (2016); (7) Mathews et al. (2002); (8) Capitaine et al. (2003); (9) Saastamoinen (1972); (10) Landskron & Böhm (2018); (11) MacMillan & Ma (1997); (12) Nothnagel (2009); (13) Artz et al. (2014); (14) Charlot et al. (2020).
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