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- W1969599221 abstract "We present a new estimate of the Earth's heat loss based on a new global compilation of heat flow measurements comprising 24,774 observations at 20,201 sites. On a 5 o x 5 o grid, the observations cover 62% of the Earth's surface. Empirical estimators, ref- erenced to geological map units and derived from the observations, enable heat flow to be estimated in areas without measurements. Corrections for the effects of hydrothermal circulation in the oceanic crest compen- sate for the advected heat undetected in measurements of the conductive heat flux. The mean heat flows of continents and oceans are 65 and 101 mW m -2, re- spectively, which when areally weighted yield a global mean of 87 mW m -2 and a global heat loss of 44.2 x 10 2 W, an increase of some 4-8% over earlier esti- mates. More than half of the Earth's heat loss comes from Cenozoic oceanic lithosphere. A spherical hat- monic analysis of the global heat flow field reveals strong sectoral components and lesser zonal strength. The spectrum principally reflects the geographic dis- tribution of the ocean ridge system. The rate at which the heat flow spectrum loses strength with increasing harmonic degree is similar to the decline in spectral strength exhibited by the Earth's topography. The spectra of the gravitational and magnetic fields fall off much more steeply, consistent with field sources in the lower mantle and core, respectively. Families of con- tinental and oceanic conductive geotherms indicate the range of temperatures existing in the lithosphere under various surface heat flow conditions. The heat flow field is very well correlated with the seismic shear wave velocity distribution near the top of the upper mantle." @default.
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- W1969599221 date "1993-01-01" @default.
- W1969599221 modified "2023-10-06" @default.
- W1969599221 title "Heat flow from the Earth's interior: Analysis of the global data set" @default.
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- W1969599221 doi "https://doi.org/10.1029/93rg01249" @default.
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