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GRACE's spatial aliasing error

Cited 38 time in scopus
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Title
GRACE's spatial aliasing error
Other Titles
GRACE의 공간 알리아스 에러
Authors
Seo, Ki-Weon
Duane E. Waliser
Jianli Chen
Clark R. Wilson
Subject
Geochemistry & Geophysics
Keywords
GRACE; alias; time-varying gravity
Issue Date
2008
Publisher
Blackwell Synergy
Citation
Seo, Ki-Weon, et al. 2008. "GRACE's spatial aliasing error". GEOPHYSICAL JOURNAL INTERNATIONAL, 172(1): 41-48.
Abstract
The GRACE satellite mission provides a near-continuous sequence of approximately 30-d gravity field solutions in the form of spherical harmonics (SH). Because SH functions are global while GRACE measurements are sensitive mainly to variations along the ground-track, undersampling (alias contamination) occurs. Here we investigate how geophysical signals are likely to cause alias error in GRACE gravity fields. We use actual GRACE orbits and systematically sample several types of time-varying signals that might represent either errors in geophysical models such as tide models, or unmodelled geophysical signals. We show how error in semi-diurnal tides like S2 can alias into long period variations in particular harmonics, particularly as a possible error source in the degree 2, order 0 term (C20) of GRACE fields. We also show that aliasing associated with non-tidal geophysical model errors is significant at order 15 or multiples of 15, due to the GRACE ground track spacing in longitude. This can be predicted from Kaula’s resonance formula and might be reduced by suppressing amplitudes of affected harmonics.
URI
http://repository.kopri.re.kr/handle/201206/6406
DOI
http://dx.doi.org/10.1111/j.1365-246X.2007.03611.x
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