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Communication

The Unique Role of the Jason Geodetic Missions for high Resolution Gravity Field and Mean Sea Surface Modelling

1
DTU Space, Technical University of Denmark, 2800 Lyngby, Denmark
2
School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China
3
Institute of Geophysics and Planetary Physics, Scripps Institute of Oceanography, University of California San Diego, La Jolla, CA 92093, USA
4
CNES, Av. Edouard Belin, 31401 Toulouse, France
5
NOAA, 5830 University Research Court, College Park, MD 20740, USA
*
Author to whom correspondence should be addressed.
Academic Editor: Xiaoxiong Xiong
Remote Sens. 2021, 13(4), 646; https://doi.org/10.3390/rs13040646
Received: 30 December 2020 / Revised: 2 February 2021 / Accepted: 5 February 2021 / Published: 11 February 2021
(This article belongs to the Section Satellite Missions for Earth and Planetary Exploration)
The resolutions of current global altimetric gravity models and mean sea surface models are around 12 km wavelength resolving 6 km features, and for many years it has been difficult to improve the resolution further in a systematic way. For both Jason 1 and 2, a Geodetic Mission (GM) has been carried out as a part of the Extension-of-Life phase. The GM for Jason-1 lasted 406 days. The GM for Jason-2 was planned to provide ground-tracks with a systematic spacing of 4 km after 2 years and potentially 2 km after 4 years. Unfortunately, the satellite ceased operation in October 2019 after 2 years of Geodetic Mission but still provided a fantastic dataset for high resolution gravity recovery. We highlight the improvement to the gravity field which has been derived from the 2 years GM. When an Extension-of-Life phase is conducted, the satellite instruments will be old. Particularly Jason-2 suffered from several safe-holds and instrument outages during the GM. This leads to systematic gaps in the data-coverage and degrades the quality of the derived gravity field. For the first time, the Jason-2 GM was “rewound” to mitigate the effect of the outages, and we evaluate the effect of “mission rewind” on gravity. With the recent successful launch of Sentinel-6 Michael Freilich (S6-MF, formerly Jason CS), we investigate the possibility creating an altimetric dataset with 2 km track spacing as this would lead to fundamental increase in the spatial resolution of global altimetric gravity fields. We investigate the effect of bisecting the ground-tracks of existing GM to create a mesh with twice the resolution rather than starting all over with a new GM. The idea explores the unique opportunity to inject Jason-3 GM into the same orbital plane as used for Jason-2 GM but bisecting the existing Jason-2 tracks. This way, the already 2-years Jason-2 GM could be used to create a 2 km grid after only 2 years of Jason-3 GM, rather than starting all over with a new GM for Jason-3. View Full-Text
Keywords: satellite altimetry; geodetic mission; marine gravity; mean sea surface satellite altimetry; geodetic mission; marine gravity; mean sea surface
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MDPI and ACS Style

Andersen, O.B.; Zhang, S.; Sandwell, D.T.; Dibarboure, G.; Smith, W.H.F.; Abulaitijiang, A. The Unique Role of the Jason Geodetic Missions for high Resolution Gravity Field and Mean Sea Surface Modelling. Remote Sens. 2021, 13, 646. https://doi.org/10.3390/rs13040646

AMA Style

Andersen OB, Zhang S, Sandwell DT, Dibarboure G, Smith WHF, Abulaitijiang A. The Unique Role of the Jason Geodetic Missions for high Resolution Gravity Field and Mean Sea Surface Modelling. Remote Sensing. 2021; 13(4):646. https://doi.org/10.3390/rs13040646

Chicago/Turabian Style

Andersen, Ole B., Shengjun Zhang, David T. Sandwell, Gérald Dibarboure, Walter H.F. Smith, and Adili Abulaitijiang. 2021. "The Unique Role of the Jason Geodetic Missions for high Resolution Gravity Field and Mean Sea Surface Modelling" Remote Sensing 13, no. 4: 646. https://doi.org/10.3390/rs13040646

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