| Titre | Data requirement for determining temporal change of the Canadian Geodetic Vertical Datum of 2013 (CGVD2013) and IHRF |
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| Auteur | Huang, J ;
Véronneau, M; Pavlic, G; Crowley, J W |
| Source | American Geophysical Union Fall Meeting 2019, abstracts; G23B-0765, 2019 p. 1  Accès ouvert |
| Liens | Online - En ligne
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| Image |  |
| Année | 2019 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20190251 |
| Éditeur | American Geophysical Union |
| Réunion | American Geophysical Union Fall Meeting 2019; San Francisco, CA; US; décembre 9-13, 2019 |
| Document | site Web |
| Lang. | anglais |
| Media | en ligne; numérique |
| Formats | html; pdf |
| Province | Canada; Colombie-Britannique; Alberta; Saskatchewan; Manitoba; Ontario; Québec; Nouveau-Brunswick; Nouvelle-Écosse; Île-du-Prince-Édouard; Terre-Neuve-et-Labrador; Territoires du Nord-Ouest; Yukon;
Nunavut; Canada |
| SNRC | 1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65;
66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 82; 83; 84; 85; 86; 87; 88; 89; 92; 93; 94; 95; 96; 97; 98; 99; 102; 103; 104; 105; 106; 107; 114O; 114P; 115; 116; 117; 120; 340; 560 |
| Sujets | géodésie; géodésie par satellite; isostasie; glaciers; glace; eau souterraine; eaux de surface; interprétations de la pesanteur; modèles; Données géographiques; Changement climatique; géophysique;
Sciences et technologie; tectonique; hydrogéologie; géologie des dépôts meubles/géomorphologie; Nature et environnement |
| Programme | Levés géodésiques du Canada Analyse et développement géodésiques - Gravimétrie et systèmes altimétriques |
| Diffusé | 2019 12 01 |
| Résumé | (disponible en anglais seulement)
CGVD2013 represents a modern vertical datum as it is compatible with today’s positioning technique through Global Navigation Satellite System (GNSS). It was
realized by the Canadian Gravimetric Geoid of 2013, an equipotential surface representing the best fit of mean sea level (MSL) for the North American region. Even though this geoid model is associated to an epoch (2011.0), NRCan considers currently
the geoid model as static, i.e., the geoid heights do not change in time. However, the real-time geoid varies with time in response to mass redistributions associated with various processes in the Earth system. These processes include atmospheric,
oceanic and hydrological circulations, glacial accumulation/loss, glacial isostatic adjustment (GIA), solid earth and ocean tides, earthquakes and volcanic eruption, and other mass variations inside the Earth. Observations from space and ground based
sensors are required to study these processes. To connect CGVD2013 to its defined equipotential surface in time, temporal change of the geoid needs to be determined from the observations and resulting models of these processes. This contribution aims
to define the data requirement for determining the geoid change greater than 1 cm and its corresponding spatial scale over a time scale of 10 years. We primarily focus on temporal geoid changes due to GIA, glacial/ice melt and terrestrial water
storage variations, which are three dominant processes in Canada. We have used two GIA models (ICE-5G and ICE-6G models), and GPS-absolute-gravity derived gravity changes, the ice mass balance model of RACMO2.3, and GLDAS prediction to quantify
spatial scales and amplitudes of the changes, and monthly GRACE models from three processing centers (CSR, GFZ, JPL) to determine the suitability of GRACE and GRACE FO for monitoring the geoid changes. The result of this regional study can be
extended to IHRF development. |
| GEOSCAN ID | 321468 |
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