Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
High-frequency variations in Earth rotation from Global Positioning Systemdata
Autore:
Rothacher, M; Beutler, G; Weber, R; Hefty, J;
Indirizzi:
Tech Univ Munich, Forschungseinrichtung Satellitengeodasie, D-80290 Munich, Germany Tech Univ Munich Munich Germany D-80290 eodasie, D-80290 Munich, Germany Univ Bern, Astron Inst, CH-3012 Bern, Switzerland Univ Bern Bern Switzerland CH-3012 stron Inst, CH-3012 Bern, Switzerland Univ Technol Vienna, Dept Theoret Geodsy, A-1040 Vienna, Austria Univ Technol Vienna Vienna Austria A-1040 Geodsy, A-1040 Vienna, Austria Slovak Tech Univ, Dept Theoret Geodesy, SK-81368 Bratislava, Slovakia Slovak Tech Univ Bratislava Slovakia SK-81368 81368 Bratislava, Slovakia
Titolo Testata:
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
fascicolo: B7, volume: 106, anno: 2001,
pagine: 13711 - 13738
SICI:
0148-0227(20010710)106:B7<13711:HVIERF>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
BASE-LINE INTERFEROMETRY; SUB-DAILY RESOLUTION; OCEAN TIDES; SEMIDIURNAL VARIATIONS; ANGULAR-MOMENTUM; FORCED NUTATIONS; PERIODIC CHANGES; WORLD OCEAN; ORIENTATION; PARAMETERS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
48
Recensione:
Indirizzi per estratti:
Indirizzo: Rothacher, M Tech Univ Munich, Forschungseinrichtung Satellitengeodasie, Arcisstr 21, D-80290 Munich, Germany Tech Univ Munich Arcisstr 21 Munich Germany D-80290 Germany
Citazione:
M. Rothacher et al., "High-frequency variations in Earth rotation from Global Positioning Systemdata", J GEO R-SOL, 106(B7), 2001, pp. 13711-13738

Abstract

Using the data of the global, dense Global Positioning System (GPS) network established by the International GPS Service a continuous, uninterrupted series of subdaily Earth rotation parameters (ERPs) with a time resolution of 2 hours has been generated at the Center for Orbit Determination in Europe. The series starts in January 1995 and has a length of more than 3 years. Starting from the 2-hour ERP values of this, to our knowledge, unique time series, the high-frequency variations in Universal Time (UTI) and polar motion (PM) due to ocean tides are studied and a set of sine and cosine coefficients is estimated for all the major tidal terms at nearly diurnal and semidiurnal frequencies. The GPS series is not very homogeneous (various processing changes during the 3 years) and still short compared to the length of very long baseline interferometry (VLBI) and satellite laser ranging (SLR) data sets. However, the results derived from this series are already of the same quality as the results from VLBI and SLR. A comparison of the tidal coefficients stemming from all three space-geodetic techniques shows an agreement on the 1 mus level for UT1 and 10 microarc seconds (mu as) for PM,respectively. The RMS difference between the ocean tide amplitudes estimated from GPS data and from TOPEX/Poseidon altimeter data amounts to 0.7-0.9 mus in UT1 and 9-13 mu as in PM. The residual spectrum that remains after the removal of all tidal terms has a noise level of similar to 5-10 mu as inPM and 0.5-1 mus in UT1 and contains nontidal signals (up to 55 mu as in PM and 3 mus in UT1) that might be due to the impact of the satellite orbit modeling (12-hour revolution period of the satellites) or, alternatively, due to atmospheric or oceanic normal modes.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/04/20 alle ore 11:39:19