Abstract
The influence of global warming in Earth rotation speed
Highlights
Introduction and motivationA distinguishing characteristic of the Earth's rotation is that the rate of rotation varies with time
This study based on the angular momentum (AAM) series computed with the zonal wind ®eld from NCAR/NCEP reanalyses shows that AAM present a measurable and clear positive trend over the last 49 years (1949±1997)
The trend in AAM is con®rmed by four independent data sets arising from dierent atmospheric operational centers, i.e. ECMWF, UKMO, Japan Meteorological Agency (JMA) and the NMC (
Summary
Introduction and motivationA distinguishing characteristic of the Earth's rotation is that the rate of rotation varies with time. There must be an average accelerative non tidal component in the Earth's rotation which acts to decrease the LOD by A0.6 0.1 ms/cy. Using laserranging data from Lageos and Starlette satellites, it has been possible to measure changes in the Earth's gravitational ®eld and estimate secular variability in LOD due to internal mass distribution within the Earth system. These measurements range from A0.44 0.05 ms/cy to A0.61 0.05 ms/cy, consistent with values we should expect from a postglacial rebound process (Peltier and Jiang, 1996)
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