ISSN 0016-7126 (Print)
ISSN 2587-8492 (Online)
Abstract:
The purpose of this study is to determine marine gravity anomalies with high accuracy using the CryoSat-2 satellite altimetry data in the Middle Vietnamese Sea and the adjacent territory. For this, the mentioned data and the process of determining gravity anomalies from the CryoSat-2 data were analyzed. The record from 818 GNSS-leveling points in Vietnam were used to evaluate and select the best global gravity field model for use in the calculation process. The findings from 31 gauge tidal were also used to assess and select the best mean dynamic topography model for the study area. Marine gravity anomalies in the study area were calculated using data from the CryoSat-2 satellite altimeter at 72 483 measurement points. The calculated results are compared with the ship-derived gravity anomalies at 1025 measurement points for assessment. The research results show that of the Earth Geopotential Model EIGEN6C4 and the Mean Dynamic Topography Model DTU15MDT are the most suitable for the research area. The accuracy of satellite-derived gravity anomalies, calculated from the CryoSat-2 satellite altimetry data in the study area, reaches ±1,18 mGal. Compared to the available results in the study area, this accuracy is the highest.
The authors are grateful to: European Space Agency for providing satellite altimetry data, Vietnamese Ministry of Education and Training for supporting the project (B2021-MDA-06), Dr. V. V. Popadjev for help in the work.
References:
| 1. Nguen Van Shang. Uravnivanie peresechenii trekov sputnikovoi al'timetrii na akvatorii, prilegayushchei k V'etnamu. Izvestia vuzov. Geodesy and Aerophotosurveying, 2012, no. 3, pp. 8–12. |
| 2. Neyman Yu. M., Byvshev V. A. Variacionnyj metod fizicheskoy geodezii i kollokaciia [Variation method of physical geodesy and collocation]. Gravimetriia i geodezii, M.: Nauchnyj mir, 2010, pp. 120–174. |
| 3. Andersen O. B., Knudsen P., Kenyon S., Factor J. K., Holmes S. (2017) Global gravity field from recent satellites (DTU15) – Arctic improvements. First Break, no. 35 (12), pp. 37–40. DOI: 10.3997/1365-2397.2017022. |
| 4. Andersen O. B., Knudsen P., Philippa A. M. B. (2010) The DNSC08GRA global marine gravity field from double retracked satellite altimetry. Journal of Geodesy, no. 84, pp. 191–199. |
| 5. Bui Cong Que, Tran Tuan Dung, Le Tram (2008) Construction of Bouguer gravity anomaly map in the East Vietnam Sea and adjacent area. Vietnam Journal of Marine Science and Technology, no. 2, pp. 29–41. |
| 6. (2007) ESA-ESTEC 2007. CryoSat Mission and Data Description, Noordwijk, The Netherlands, European Space Agency ESTEC. no. 3, 82 p. |
| 7. Forsberg R., Tscherning C. C. (2008) An overview manual for the GRAVSOFT Geodetic Gravity Field Modelling Programs. 75 p. |
| 8. Ha Minh Hoa (2015) Research and assessment of sea level standards (depth “0” surface, average and highest depth) according to modern geodetic, marine and tectonic methods for construction of process and planning of coastal zones in Vietnam in the trend of climate change. Synthesis report of scientific research and technological development results of KC.09.19/11-15. Hanoi, Vietnam, 560 p. |
| 9. Ince E. S., Barthelmes F., Reißland S., Elger K., Förste C., Flechtner F., Schuh H. (2019) ICGEM – 15 years of successful collection and distribution of global gravitational models, associated services, and future plans. Earth Syst. Sci. Data, no. 11, pp. 647–674. |
Citation:
| (2022) Determination of gravity anomalies in the waters of Viet Nam and around using CryoSat-2 space altimetry. Geodesy and cartography = Geodezia i Kartografia, 83(5), pp. 19-27. (In Russian). DOI: 10.22389/0016-7126-2022-983-5-19-27 |
Publication History
|
Received: 01.04.2021 Accepted: 11.05.2022 Published: 20.06.2022 |
Authors:
Content
|
2022 May
DOI: 10.22389/0016-7126-2022-983-5
 |