Topographic Correction of Geothermal Heat Flux in 10.1029/2020JF005598 Greenland and Antarctica Key Points: William Colgan1,2 , Joseph A
RESEARCH ARTICLE Topographic Correction of Geothermal Heat Flux in 10.1029/2020JF005598 Greenland and Antarctica Key Points: William Colgan1,2 , Joseph A. MacGregor3 , Kenneth D. Mankoff1 , • Deeply incised subglacial valleys Ryan Haagenson4 , Harihar Rajaram4 , Yasmina M. Martos5,6 , can double local geothermal 7 8 1 flux beneath the Greenland and Mathieu Morlighem , Mark A. Fahnestock , and Kristian K. Kjeldsen Antarctic ice sheets 1 • The magnitude of topographic Department of Glaciology and Climate, Geological Survey of Denmark and Greenland, Copenhagen, Denmark, 2 3 correction often exceeds uncertainty Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA, Cryospheric in geothermal heat flux where Sciences Laboratory (Code 615), NASA Goddard Space Flight Center, Greenbelt, MD, USA, 4Department of subglacial topography is best Environmental Health and Engineering, John Hopkins University, Baltimore, MD, USA, 5Planetary Magnetospheres resolved 6 • Positional uncertainties for Laboratory (Code 695), NASA Goddard Space Flight Center, Greenbelt, MD, USA, Department of Astronomy, 7 geothermal flux measurements of University of Maryland, College Park, MD, USA, Department of Earth System Science, University of California, Irvine, greater than 100 m can prevent CA, USA, 8Geophysical Institute, University of Alaska, Fairbanks, AK, USA robust topographic corrections thereof Abstract We present a new approach to account for the influence of subglacial topography on Supporting Information: geothermal heat flux beneath the Greenland and Antarctic ice sheets. We first establish a simple empirical • Supporting Information S1 proportionality between local geothermal flux and topographic relief within a given radius, based on a synthesis of existing observations of these properties elsewhere on Earth. This analysis essentially yields Correspondence to: a high-pass filter that can be readily applied to existing large-scale geothermal heat flux fields to render W.
[Show full text]