Greenland Geothermal Heat Flow Database and Map (Version 1)

Colgan, William; Wansing, Agnes; Mankoff, Kenneth D.; Lösing, Mareen; Hopper, John R.; Louden, K. E.; Ebbing, Jörg; Christiansen, Flemming G.; Ingeman‐Nielsen, Thomas; Liljedahl, Lillemor Claesson; MacGregor, Joseph A.; Hjartarson, Árni; Bernstein, Stefan; Karlsson, Nanna B.; Fuchs, Sven; Hartikainen, Juha; Liakka, Johan; Fausto, Robert S.; Dahl‐Jensen, Dorthe; Björk, Anders; Naslund, Jens-Ove; Mørk, Finn; Martos, Yasmina M.; Balling, Niels; Funck, Thomas; Kjeldsen, Kristian K.; Petersen, Dorthe; Gregersen, Ulrik; Dam, Gregers; Nielsen, Tove; Khan, Abbas; Løkkegaard, Anja

doi:10.5194/essd-2021-290

Cited by 4 publications

(4 citation statements)

References 47 publications

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“…Finally, there are two examples of plume‐craton interaction for which extensive focus has been placed on heat flux: Marie Byrd Land in Antarctica (Lösing et al., 2020; Maule et al., 2005; Seroussi et al., 2017; Shen et al., 2020), and the Iceland plume in Greenland (e.g., Colgan et al., 2021; Martos et al., 2018). In both locations, the heat flux associated with the plume can have significant effects on the melting rates of ice (Rogozhina et al., 2016; Rysgaard et al., 2018; Smith‐Johnsen et al., 2020).…”

Section: Introductionmentioning

confidence: 99%

On the Relation Between Basal Erosion of the Lithosphere and Surface Heat Flux for Continental Plume Tracks

Heyn

Conrad

2022

Geophysical Research Letters

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While hotspot tracks beneath thin oceanic lithosphere are visible as volcanic island chains, the plume‐lithosphere interaction for thick continental or cratonic lithosphere often remains hidden due to the lack of volcanism. To identify plume tracks with missing volcanism, we characterize the amplitude and timing of surface heat flux anomalies following a plume‐lithosphere interaction using mantle convection models. Our numerical results confirm an analytical relationship in which surface heat flux increases with the extent of lithosphere thinning, which is primarily controlled by the viscosity structure of the lower lithosphere and the asthenosphere. We find that lithosphere thinning is greatest when the plate is above the plume conduit, while the maximum heat flux anomaly occurs about 40–140 Myr later. Therefore, younger continental and cratonic plume tracks can be identified by observed lithosphere thinning, and older tracks by an increased surface heat flux, even if they lack extrusive magmatism.

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Section: Introductionmentioning

confidence: 99%

On the Relation Between Basal Erosion of the Lithosphere and Surface Heat Flux for Continental Plume Tracks

Heyn

Conrad

2022

Geophysical Research Letters

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“…As heat diffusion is generally well-represented and well-constrained in all ice flow models, this may suggest that this particular PISM simulation employs too high a geothermal heat flow into the ice sheet base. We note that the geothermal flow is poorly constrained under the Greenland ice sheet (Rezvanbehbahani et al, 2017;Colgan et al, 2022) and over long spin-up periods, so even small deviations in the geothermal heat flow can result in large variations in ice temperature.…”

Section: Comparison With Simulated Ice Temperaturesmentioning

confidence: 89%

“…Suggested additional heat sources include cryo-hydrological warming -which transfers latent heat when surface meltwater flows through englacial pathways and refreezes -deformational heating, and basal water heat flux (Funk et al, 1994;Wohlleben et al, 2009;Phillips et al, 2013;Lüthi et al, 2015;Zekollari et al, 2017;Karlsson et al, 2020). Modeled ice temperatures are likely also influenced by the choice of geothermal heat flow map, however, there is a diversity of opinion regarding the magnitude and spatial distribution of geothermal heat flow beneath the ice sheet (Rezvanbehbahani et al, 2017;Colgan et al, 2022).…”

Section: Comparison With Simulated Ice Temperaturesmentioning

confidence: 99%

Greenland and Canadian Arctic ice temperature profiles database

Løkkegaard,

Mankoff,

Zdanowicz

et al. 2023

The Cryosphere

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Abstract. Here, we present a compilation of 95 ice temperature profiles from 85 boreholes from the Greenland ice sheet and peripheral ice caps, as well as local ice caps in the Canadian Arctic. Profiles from only 31 boreholes (36 %) were previously available in open-access data repositories. The remaining 54 borehole profiles (64 %) are being made digitally available here for the first time. These newly available profiles, which are associated with pre-2010 boreholes, have been submitted by community members or digitized from published graphics and/or data tables. All 95 profiles are now made available in both absolute (meters) and normalized (0 to 1 ice thickness) depth scales and are accompanied by extensive metadata. These metadata include a transparent description of data provenance. The ice temperature profiles span 70 years, with the earliest profile being from 1950 at Camp VI, West Greenland. To highlight the value of this database in evaluating ice flow simulations, we compare the ice temperature profiles from the Greenland ice sheet with an ice flow simulation by the Parallel Ice Sheet Model (PISM). We find a cold bias in modeled near-surface ice temperatures within the ablation area, a warm bias in modeled basal ice temperatures at inland cold-bedded sites, and an apparent underestimation of deformational heating in high-strain settings. These biases provide process level insight on simulated ice temperatures.

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“…Finally, there are two examples of plume-craton interaction for which extensive focus has been placed on heat flux: Marie Byrd Land in Antarctica (Lösing et al, 2020;Maule et al, 2005;Seroussi et al, 2017;Shen et al, 2020), and the Iceland plume in Greenland (e.g., Colgan et al, 2021;Martos et al, 2018). In both locations, the heat flux associated with the plume can have significant effects on the melting rates of ice (Rogozhina et al, 2016;Rysgaard et al, 2018;Smith-Johnsen et al, 2020).…”

Section: Supporting Informationmentioning

confidence: 99%

On the relation between basal erosion of the lithosphere and surface heat flux for continental plume tracks

Heyn

Conrad

2022

Preprint

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One of the most prominent surface expressions of mantle convection is linked to the interaction of deep-rooted mantle upwellings, so-called plumes, with the lithosphere. The arrival of plume heads is thought to cause massive volcanism in the form of large igneous provinces (LIPs) (e.g., Richards et al., 1989;Torsvik et al., 2016), which are found on both continents and seafloor. For relatively thin oceanic plates, hotspot tracks of volcanic islands delineate the path of the plate over the plume tail (e.g., Dannberg & Gassmöller, 2018;Harrison et al., 2017;Morgan, 1971). These plume tracks can be used to link LIPs with current-day hotspot volcanism, and provide important information for the reconstruction of plate motions (Bono et al., 2019;Doubrovine et al., 2012). However, these hotspot tracks of continuous extrusive volcanism are often missing on thicker continental lithosphere (Davies, 1994;Yang & Leng, 2014). Oceanic hotspots and hotspot tracks have been analyzed with respect to several key properties, including their surface swell (

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Greenland Geothermal Heat Flow Database and Map (Version 1)

Cited by 4 publications

References 47 publications

On the Relation Between Basal Erosion of the Lithosphere and Surface Heat Flux for Continental Plume Tracks

On the Relation Between Basal Erosion of the Lithosphere and Surface Heat Flux for Continental Plume Tracks

Greenland and Canadian Arctic ice temperature profiles database

On the relation between basal erosion of the lithosphere and surface heat flux for continental plume tracks

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