Variations in the accuracy of gravity recovery due to ground track variability: GRACE, CHAMP, and GOCE

Following an earlier recognition of degraded monthly geopotential recovery from GRACE (Gravity Recovery And Climate Experiment) due to prolonged passage through a short repeat (low order resonant) orbit, we extend these insights also to CHAMP (CHAllenging Minisatellite Payload) and GOCE (Gravity fie...

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Bibliographic Details
Published in:Journal of geodesy 2008-12, Vol.82 (12), p.917-927
Main Authors: Klokočník, J., Wagner, C. A., Kostelecký, J., Bezděk, A., Novák, P., McAdoo, D.
Format: Article
Language:English
Subjects:
Accuracy
Earth and Environmental Science
Earth Sciences
Geodetics
Geophysics/Geodesy
Gravity
Marine
Ocean circulation
Original Article
Water circulation
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Summary:Following an earlier recognition of degraded monthly geopotential recovery from GRACE (Gravity Recovery And Climate Experiment) due to prolonged passage through a short repeat (low order resonant) orbit, we extend these insights also to CHAMP (CHAllenging Minisatellite Payload) and GOCE (Gravity field and steady state Ocean Circulation Explorer). We show wide track-density variations over time for these orbits in both latitude and longitude, and estimate that geopotential recovery will be as widely affected as well within all these regimes, with lesser track density leading to poorer recoveries. We then use recent models of atmospheric density to estimate the future orbit of GRACE and warn of degraded performance as other low order resonances are encountered in GRACE’s free fall. Finally implications for the GOCE orbit are discussed.
ISSN:0949-7714
1432-1394
DOI:10.1007/s00190-008-0222-0