Significant improvements in marine gravity from ongoing satellite missions

TitleSignificant improvements in marine gravity from ongoing satellite missions
Publication TypeJournal Article
Year of Publication2013
AuthorsMarks K.M, Smith W.HF, Sandwell DT
JournalMarine Geophysical Research
Volume34
Pagination137-146
Date Published2013/06
Type of ArticleArticle
ISBN Number0025-3235
Accession NumberWOS:000324499800005
Keywordsaltimetry; Bathymetry; Coherence; Multibeam; noise; Satellite gravity
Abstract

Incorporating new altimeter data from CryoSat-2 (30 months), Envisat (18 months), and Jason-1 (7 months) satellites into an updated marine gravity field yields significant reduction in noise and improved resolution. Compared to an older gravity field that did not include the new altimeter data, incoherent power is reduced globally by approximately 2.9 dB at 15 km, 1.6 dB at 20 km, and 1.0 dB at 25 km wavelengths. Coherence analyses between the updated gravity and recent multibeam surveys distributed throughout the world's oceans shows an average increase of similar to 0.023 in mean coherence in the 20-160 km waveband, with the biggest increase (> 0.08) over fast spreading ridges and smallest (< 0.02) over slow spreading ridges and continental shelves. The shortest wavelength at which coherence is above 0.5 decreased globally by similar to 2 km wavelength, with the biggest decrease (> 3.5 km) over fast spreading ridges and smallest (< 1.5 km) over slow spreading ridges and continental shelves. In the Clipperton fracture zone area these improvements result in seamounts that are more accurately located, the detection of smaller seamounts, and the expression of north-south trending abyssal hill fabric. As more altimeter data from the ongoing satellite missions are incorporated into future gravity field updates, finer-scale details of the seafloor will continue to emerge.

DOI10.1007/s11001-013-9190-8
Short TitleMar. Geophys. Res.
Student Publication: 
No