Earth's surface heat flux
We present a revised estimate of Earth's surface heat flux that is based upon a heat flow data-set with 38 347 measurements, which is 55% more than used in previous estimates. Our methodology, like others, accounts for hydrothermal circulation in young oceanic crust by utilising a half-space co...
Main Authors: | , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Copernicus GmbH
2015
|
Subjects: | |
Online Access: | http://hdl.handle.net/1885/65286 |
id |
ftanucanberra:oai:digitalcollections.anu.edu.au:1885/65286 |
---|---|
record_format |
openpolar |
spelling |
ftanucanberra:oai:digitalcollections.anu.edu.au:1885/65286 2023-05-15T13:36:32+02:00 Earth's surface heat flux Davies, J Davies, Rhodri 2015-12-10T23:17:36Z http://hdl.handle.net/1885/65286 unknown Copernicus GmbH 1869-9510 http://hdl.handle.net/1885/65286 Solid Earth Journal article 2015 ftanucanberra 2015-12-28T23:33:02Z We present a revised estimate of Earth's surface heat flux that is based upon a heat flow data-set with 38 347 measurements, which is 55% more than used in previous estimates. Our methodology, like others, accounts for hydrothermal circulation in young oceanic crust by utilising a half-space cooling approximation. For the rest of Earth's surface, we estimate the average heat flow for different geologic domains as defined by global digital geology maps; and then produce the global estimate by multiplying it by the total global area of that geologic domain. The averaging is done on a polygon set which results from an intersection of a 1 degree equal area grid with the original geology polygons; this minimises the adverse influence of clustering. These operations and estimates are derived accurately using methodologies from Geographical Information Science. We consider the virtually un-sampled Antarctica separately and also make a small correction for hot-spots in young oceanic lithosphere. A range of analyses is presented. These, combined with statistical estimates of the error, provide a measure of robustness. Our final preferred estimate is 47±2 TW, which is greater than previous estimates. Article in Journal/Newspaper Antarc* Antarctica Australian National University: ANU Digital Collections |
institution |
Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
unknown |
description |
We present a revised estimate of Earth's surface heat flux that is based upon a heat flow data-set with 38 347 measurements, which is 55% more than used in previous estimates. Our methodology, like others, accounts for hydrothermal circulation in young oceanic crust by utilising a half-space cooling approximation. For the rest of Earth's surface, we estimate the average heat flow for different geologic domains as defined by global digital geology maps; and then produce the global estimate by multiplying it by the total global area of that geologic domain. The averaging is done on a polygon set which results from an intersection of a 1 degree equal area grid with the original geology polygons; this minimises the adverse influence of clustering. These operations and estimates are derived accurately using methodologies from Geographical Information Science. We consider the virtually un-sampled Antarctica separately and also make a small correction for hot-spots in young oceanic lithosphere. A range of analyses is presented. These, combined with statistical estimates of the error, provide a measure of robustness. Our final preferred estimate is 47±2 TW, which is greater than previous estimates. |
format |
Article in Journal/Newspaper |
author |
Davies, J Davies, Rhodri |
spellingShingle |
Davies, J Davies, Rhodri Earth's surface heat flux |
author_facet |
Davies, J Davies, Rhodri |
author_sort |
Davies, J |
title |
Earth's surface heat flux |
title_short |
Earth's surface heat flux |
title_full |
Earth's surface heat flux |
title_fullStr |
Earth's surface heat flux |
title_full_unstemmed |
Earth's surface heat flux |
title_sort |
earth's surface heat flux |
publisher |
Copernicus GmbH |
publishDate |
2015 |
url |
http://hdl.handle.net/1885/65286 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Solid Earth |
op_relation |
1869-9510 http://hdl.handle.net/1885/65286 |
_version_ |
1766080226793619456 |