| Title | Data requirement for determining temporal change of the Canadian Geodetic Vertical Datum of 2013 (CGVD2013) and IHRF |
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| Author | Huang, J ;
Véronneau, M; Pavlic, G; Crowley, J W |
| Source | American Geophysical Union Fall Meeting 2019, abstracts; G23B-0765, 2019 p. 1  Open Access |
| Links | Online - En ligne
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| Image |  |
| Year | 2019 |
| Alt Series | Natural Resources Canada, Contribution Series 20190251 |
| Publisher | American Geophysical Union |
| Meeting | American Geophysical Union Fall Meeting 2019; San Francisco, CA; US; December 9-13, 2019 |
| Document | Web site |
| Lang. | English |
| Media | on-line; digital |
| File format | html; pdf |
| Province | Canada; British Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut;
Canada |
| NTS | 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 |
| Lat/Long WENS | -141.0000 -50.0000 90.0000 41.7500 |
| Subjects | geophysics; Science and Technology; tectonics; hydrogeology; surficial geology/geomorphology; Nature and Environment; geodesy; satellite geodesy; isostasy; glaciers; ice; groundwater; surface waters;
gravity interpretations; models; Canadian Geodetic Vertical Datum of 2013 (CGVD2013); Gravity Recovery and Climate Experiment (GRACE); International Height Reference Frame (IHRF); global navigation satellite systems (GNSS); Geographic data; Climate
change |
| Program | Canadian Geodetic Survey Geodetic Analysis and Development - Gravity and heights systems |
| Released | 2019 12 01 |
| Abstract | 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. |
| Summary | (Plain Language Summary, not published)
This article discusses a critical aspect of geodetic data, known as CGVD2013, used for precise positioning and navigation, especially with Global
Navigation Satellite Systems (GNSS). CGVD2013 is an essential tool for accurately measuring elevations on the Earth's surface.
The researchers examine how this geodetic data varies over time due to various natural processes like changes in the
Earth's crust, melting ice, and shifts in water storage. Understanding these changes is crucial for maintaining the accuracy of geodetic data for ten years or more.
The study primarily focuses on the impact of processes such as glacial isostatic
adjustment (GIA), ice melting, and variations in water storage in Canada. To assess these changes, the researchers use various models and observations, including data from satellites and ground-based sensors.
The key finding is that these changes
can be significant, with the potential to alter the geodetic data by more than 1 centimeter over a ten-year period. This research helps define the data requirements and methods for monitoring and adjusting geodetic data to account for these
changes.
The scientific impact of this work is essential because accurate geodetic data is crucial for applications like navigation, land surveying, and infrastructure development. Understanding and accounting for the changes in geodetic data over
time is vital for maintaining the precision and reliability of these systems, which affect various aspects of our daily lives. |
| GEOSCAN ID | 321468 |
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