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GRAVSAT error analysis by means of global spectral analyses of the marine geoid from SEASAT altimeter dataThe geographical variability of short wavelength geoid power spectra (geoid roughness), was mapped for the world's oceans between latitudes 72 deg N and 72 deg S. A spectral analysis of SEASAT altimeter data, reduced to sea surface heights, was performed at 2 minute intervals for 15 consecutive days of the 3-day repeat orbit. The geoid roughness represented by these spectra for wavelengths shorter than about 220 km is separated from the total sea height variance and is displayed in the form of a global contour map. The global average geoid roughness is 32 cm RMS, varying from a high in excess of 2 m RMS near deep ocean trenches to a low of 2 cm RMS in the southeast Pacific near the East Pacific Rise. This average value agrees well with previous estimates based on gravimetry and GEOS-3 altimetry. In general, the smoothest areas in the marine geoid overlie relatively young seafloor adjacent mid-ocean spreading centers, where even short-wavelength topographic variations tend to be isostatically compensated.
Document ID
19830007477
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Date Acquired
September 4, 2013
Publication Date
April 29, 1982
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
E83-10105
NASA-CR-166819
NAS 1.26:166819
Accession Number
83N15748
Funding Number(s)
CONTRACT_GRANT: NAS5-26579
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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