Detail publikace

The geopotential value W0 for specifying the relativistic atomic time scale and a global vertical reference system

BURŠA, M., KENYON, S., KOUBA, J., ŠÍMA, Z., VATRT, V., VÍTEK, V. and VOJTÍŠKOVÁ, M.

Originální název

The geopotential value W0 for specifying the relativistic atomic time scale and a global vertical reference system

Typ

článek v časopise - ostatní, Jost

Jazyk

angličtina

Originální abstrakt

The TOPEX/Poseidon (T/P) satellite alti- meter mission marked a new era in determining the geopotential constant W 0. On the basis of T/P data during 1993-2003 (cycles 11-414), long-term variations in W 0 have been investigated. The rounded value W 0 = 62636856.0 +- 0.5) m 2 s -2 has already been adopted by the International Astronomical Union for the definition of the constant L G = W 0/c 2 = 6.969290134 x 10-10 (where c is the speed of light), which is required for the realization of the relativistic atomic time scale. The constant L G , based on the above value of W 0, is also included in the 2003 International Earth Rotation and Reference Frames Service conventions. It has also been suggested that W 0 is used to specify a global vertical reference system (GVRS). W 0 ensures the consistency with the International Terrestrial Reference System, i.e. after adopting W 0, along with the geocentric gravitational constant (GM), the Earth's rotational velocity (?) and the second zonal geopotential coefficient (J 2) as primary constants (parameters), then the ellipsoidal parameters (a,?) can be computed and adopted as derived parameters. The scale of the International Terrestrial Reference Frame 2000 (ITRF2000) has also been specified with the use of W 0 to be consistent with the geocentric coordinate time. As an example of using W 0 for a GVRS realization, the geopotential difference between the adopted W 0 and the geopotential at the Rimouski tide-gauge point, specifying the North American Vertical Datum 1988 (NAVD88), has been estimated.

Klíčová slova

Geopotential - Vertical datum unification - Relativistic atomic time scale

Autoři

BURŠA, M., KENYON, S., KOUBA, J., ŠÍMA, Z., VATRT, V., VÍTEK, V. and VOJTÍŠKOVÁ, M.

Rok RIV

2007

Vydáno

29. 9. 2006

ISSN

0949-7714

Periodikum

JOURNAL OF GEODESY

Ročník

81

Číslo

2

Stát

Spolková republika Německo

Strany od

103

Strany do

110

Strany počet

8

BibTex

@article{BUT44869,
  author="Marie {Vojtíšková}",
  title="The geopotential value W0 for specifying the relativistic atomic time scale and a global vertical reference system",
  journal="JOURNAL OF GEODESY",
  year="2006",
  volume="81",
  number="2",
  pages="103--110",
  issn="0949-7714"
}