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IB and NIB Hypotheses and their possible discrimination by GRACE
Author(s) -
Foldvary Lorant,
Fukuda Yoichi
Publication year - 2001
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2000gl011775
Subject(s) - satellite , altimeter , satellite altimetry , geology , geodesy , gravitational field , amplitude , atmospheric pressure , geophysics , degree (music) , meteorology , climatology , remote sensing , oceanography , physics , quantum mechanics , astronomy , acoustics
The NASA, the GFZ and the DLR plan the GRACE satellite mission to obtain an accurate gravity field after every 2‐4 weeks. Because of its extreme high precision, GRACE is expected to determine the temporal variations of the gravity fields due to time varying geophysical phenomena. Among them, the effects of the atmospheric surface pressure have the largest signals and we investigated its effects mainly from the viewpoint of degree amplitudes. Behaviour of atmospheric variations over oceanic areas is unknown. The response of the ocean is essentially important not only for the corrections of the atmospheric effects on gravity fields, but also for many other studies such as satellite altimetry, crustal deformation and the Earth rotations. We proposed and applied several ocean response models, i.e., IB, NIB, and intermediate ones, and evaluated the degree power differences between each one of them. The results show that almost all the differences are distinguishable by GRACE.