EarthRef.org Reference Database (ERR)
Development and Maintenance by the EarthRef.org Database Team

Detailed Reference Information
Dickman & Nam 1995
Dickman, S.R. and Nam, Y.S. (1995). Revised predictions of long-period ocean tidal effects on Earth’s rotation rate. Journal of Geophysical Research 100: doi: 10.1029/95JB00028. issn: 0148-0227.

The rotational response of Earth to long-period tidal forces, embodied in a ''zonal response function,'' can be expected to vary with frequency because of variable contributions by the oceans, mantle, and core. The zonal response function has been estimated from 9 years of International Radio Interferometric Surveying (IRIS) universal time (UT1) data and compared with theoretical predictions, using a spherical harmonic tide model to compute the oceans' dynamic response, at semiannual, monthly, fortnightly, and 9-day lunisolar tidal frequencies. Different amounts of mantle anelasticity have been considered for both the oceanic and solid earth responses; predictions have been made assuming axial core-mantle coupling which is either complete or absent. Additionally, an extensive recalibration of the ocean model's frictional parameters was performed using constraints derived in part from Space92 polar motion data; zonal response function predictions have also been made employing this recalibrated ocean tide model. Our results indicate that any amount of core coupling can be ruled out at a fortnightly period and probably at a 9-day period, but not at a monthly period. Our results also suggest that the mantle responds purely elastically at a 9-day period but may behave increasingly anelastically at longer periods. A simple dispersive rule is postulated for periods ranging up to the 14-month Chandler wobble period. ¿ American Geophysical Union 1995

BACKGROUND DATA FILES

Abstract

Keywords
Geodesy and Gravity, Rotational variations, Geodesy and Gravity, Tides—ocean, Geodesy and Gravity, Rheology of the lithosphere and mantle, Geodesy and Gravity, Earth's interior—dynamics
Journal
Journal of Geophysical Research
http://www.agu.org/journals/jb/
Publisher
American Geophysical Union
2000 Florida Avenue N.W.
Washington, D.C. 20009-1277
USA
1-202-462-6900
1-202-328-0566
service@agu.org
Click to clear formClick to return to previous pageClick to submit