| Title: |
Contrasting geothermal heat flux provinces unveiled beneath Antarctic subglacial lake districts |
| Authors: |
Fausto Ferraccioli; Pietro Latorraca; Shi Quan Ooi; Jonathan Ford; Ben Mather; Egidio Armadillo; Joerg Ebbing; Graeme Eagles; Karsten Gohl; Rene Forsberg; Chris Green; Javier Fullea; Massimo Verdoya |
| Contributors: |
Ferraccioli, Fausto; Latorraca, Pietro; Quan Ooi, Shi; Ford, Jonathan; Mather, Ben; Armadillo, Egidio; Ebbing, Joerg; Eagles, Graeme; Gohl, Karsten; Forsberg, Rene; Green, Chri; Fullea, Javier; Verdoya, Massimo |
| Publication Year: |
2025 |
| Collection: |
Università degli Studi di Genova: CINECA IRIS |
| Description: |
Antarctic geothermal heat flux (GHF) is poorly known restricting our ability to assess its influence on subglacial hydrology and ice sheet dynamics. Within the 4D Antarctica and the 3D Earth ESA projects, a new Antarctic aeromagnetic anomaly compilation, conformed at long wavelengths with SWARM satellite magnetic data was complied. All the datasets were levelled, microlevelled and stitched together. We also differentially continued all survey data to 4 km and re-gridded the compilation onto a 4 km grid mesh. Our new aeromagnetic anomaly compilation enables us to re-assess Antarctic geothermal heat flux (GHF) heterogeneity, a critical basal boundary condition that influences Antarctic ice sheet flow and subglacial melting and hydrology. To estimate GHF we applied Curie Depth Point (CDP) estimation using the centroid, modified centroid and fractal/defractal approaches. We compared our CDP results with independent constraints on crustal and lithosphere thickness derived from seismological, airborne gravity and satellite gravity modelling and effective elastic thickness estimates. We also considered empirical estimates of GHF derived from seismology and recent models of intracrustal heat production from gravity inversion to assess additional uncertainties associated with CDP to GHF conversion. We performed both automated continental scale estimates and nested manual analysis of CDP and GHF with a specific focus on different Antarctic subglacial lake districts. We found elevated GHF in the West Antarctic Rift System (WARS) beneath the rapidly changing Thwaites (THW) and Pine Island sectors of the West Antarctic Ice Sheet (WAIS) and along the edge of the Marie Byrd Land block. Focussed estimates of GHF were performed over the cascading active lakes beneath THW to provide new constraints for hydrological modelling in this critical sector of the WAIS. We image a large degree of heterogeneity in thermal basal boundary conditions beneath the active subglacial lake districts that underlie the ice streams flowing into the ... |
| Document Type: |
conference object |
| File Description: |
ELETTRONICO |
| Language: |
English |
| Relation: |
ispartofbook:Abstract; EGU General Assembly 2025; firstpage:1; lastpage:2; numberofpages:2; https://hdl.handle.net/11567/1232718 |
| Availability: |
https://hdl.handle.net/11567/1232718 |
| Accession Number: |
edsbas.4686C427 |
| Database: |
BASE |