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- W1596476263 abstract "The westward drift of the geomagnetic field implies fluid velocities in the outer core of 4×10−4 m s −1. The pressure associated with this flow is small (about 104 Pa) but it is shown that this is sufficient to produce observable deformations of the mantle. Changes in J 2, polar motion, and the length-of-day, are all measured with sufficient accuracy that these data could contain a component due to pressure anomalies, of this magnitude, at the core-mantle boundary. Relations between pressure at the core-mantle boundary and geodetic quantities such as J 2, polar motion, and the length-of-day are derived and the unexplained residual in each is used to set an upper limit on the decade-scale pressure fluctuations at the core-mantle boundary. The polar motion observations supply the most severe upper bound (< 2×103 Pa) but satellite observations of J 2 could soon prove to be more useful. It is evident that not more than 10% of the decade changes in the length-of-day can be due to pressure core-mantle coupling." @default.
- W1596476263 created "2016-06-24" @default.
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- W1596476263 date "2013-03-29" @default.
- W1596476263 modified "2023-10-16" @default.
- W1596476263 title "Planetary Scale Flow in the Earth's Core and Geodetic Observations" @default.
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- W1596476263 doi "https://doi.org/10.1029/gm046p0073" @default.
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