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            <title xml:lang="en">Analysis and Mapping of an Updated Terrestrial Heat Flow Data Set</title>
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                <title xml:lang="en">Analysis and Mapping of an Updated Terrestrial Heat Flow Data Set</title>
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              <p>Key Points: 5 • This compilation of terrestrial heat flow includes almost 70,000 measurements 6 • c1 Measured oceanic heat flow is significantly higher with recent measurements c2 7 • Subsidence at heat flow sites is larger c3 than that determined at the global scale, 8 especially for ages &gt;100 Ma 9 • A constant heat flow at the base of the lithosphere better explains heat flow and 10 subsidence data at heat flow sites 11 • Oceanic hydrothermal heat loss is c4 10.5 TW, i.e. 1.5 TW higher than previous 12 estimates, c5 which neglect the contribution of older than 65 Ma seafloor 13 • Continental heat flow is statistically consistent with previous analyses, but the dis-14 persion of values does not support a c6 significant relation with age 15 • Global heat loss based on measurements only ranges between 40-42 TW, close to 16 previous estimates using conductive cooling models c7 (45-47 TW) 17 • A generalized similarity method is used to map global variations of surface heat 18 flow c8 on a 0.5 • x 0.5 • grid. The best prediction is obtained for 14 observables. Abstract 20 The number of heat flow measurements at the Earth surface has significantly in-21 creased since the last global analysis (Pollack et al., 1993), and the most recent of them 22 provide insights into key locations. This paper presents a new compilation, which includes 23 approximately 70,000 measurements. Continental heat flow (67 mWm −2) does not change 24 significantly, but the differences are more important for oceanic heat flow. The diver-25 gence with conductive cooling models is reduced significantly for young ages of the seafloor, 26 since the most recent measurements (92 mWm −2) are significantly higher c1 on average 27 than the older ones (79 mWm −2). This is related to a better quality and a better sam-28 pling of measurements in regions affected by hydrothermal circulation. The total Earth 29 heat loss derived from these most recent measurements is estimated to ∼40-42 TW and 30 represents only 3-5 TW less than with a conductive cooling model (∼45-47 TW). Hy-31 drothermal heat loss in the oceanic domain is estimated with a new method based on 32 the ruggedness of the seafloor, and represents ∼1.5 TW more than previous estimates. 33 The heat flow variability on continents is so c2 large that defining a trend with stratigraphic 34 or tectono-thermal age is c3 very difficult. c4 On the other hand, additional geological and 35 geophysical information can be combined with age for better predictions and extrapo-36 lations. A generalized similarity method was used here to predict heat flow on a global 37 0.5 • x 0.5 • grid. The agreement with local measurements is generally good and increases 38 with the number and the quality of proxies.</p>
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