Calculating geothermal heat flux in Antarctica and evaluating its impact on the cryosphere (2018)
Type of ContentOther
Geothermal heat flux (GHF) is an essential boundary condition that has a dynamic influence over ice sheet mass balance. Difficulties associated with obtaining GHF measurements in ice covered regions mean that GHF in Antarctica is not well understood. A combination of seismic, magnetic, and rock property analysis methods have given quantities for Antarctic GHF. Via manipulation of these past measurements this review finds the average GHF value across Antarctica to be ~70 mW/m2. This GHF value equates to 7 mm/year of ice melt directly from GHF. Integrated across the entire ice sheet this melt rate is almost negligible at <1% of the total ice melt in Antarctica. Where GHF is of greatest importance is the effect it has on basal hydrology. Meltwater generated from GHF beneath the ice sheet has the potential to alter ice flow properties. Consequences of meltwater include changing ice flow velocity, and the formation of drainage channels and lakes. These factors have a huge influence on ice sheet mass balance. Consideration of these effects is essential to create accurate ice mass balance models and understand the role of GHF in the Antarctic cryosphere. Moving forward it is imperative GHF is accurately quantified and appropriately interpreted in a subglacial hydrological system.
ANZSRC Fields of Research37 - Earth sciences::3701 - Atmospheric sciences::370105 - Atmospheric dynamics
04 - Earth Sciences::0401 - Atmospheric Sciences::040104 - Climate Change Processes
Showing items related by title, author, creator and subject.
No robust evidence of future changes in major stratospheric sudden warmings: a multi-model assessment from CCMI Ayarzaguena B; Polvani LM; Langematz U; Akiyoshi H; Bekki S; Butchart N; Dameris M; Deushi M; Hardiman SC; Jockel P; Klekociuk A; Marchand M; Michou M; Morgenstern O; O'Connor F; Oman LD; Plummer DA; Revell LE; Rozanov E; Saint-Martin D; Scinocca J; Stenke A; Stone K; Yamashita Y; Yoshida K; Zeng G (2018)Major mid-winter stratospheric sudden warmings (SSWs) are the largest instance of wintertime variability in the Arctic stratosphere. Because SSWs are able to cause significant surface weather anomalies on intra-season ...
Morgenstern O; Hegglin MI; Rozanov E; O'Connor FM; Abraham NL; Akiyoshi H; Archibald AT; Bekki S; Butchart N; Chipperfield MP; Deushi M; Dhomse SS; Garcia RR; Hardiman SC; Horowitz LW; Joeckel P; Josse B; Kinnison D; Lin M; Mancini E; Manyin ME; Marchand M; Marecal V; Michou M; Oman LD; Pitari G; Plummer DA; Revell LE; Saint-Martin D; Schofield R; Stenke A; Stone K; Sudo K; Tanaka TY; Tilmes S; Yamashita Y; Yoshida K; Zeng G (2017)We present an overview of state-of-the-art chemistry–climate and chemistry transport models that are used within phase 1 of the Chemistry–Climate Model Initiative (CCMI-1). The CCMI aims to conduct a detailed evaluation ...
Attribution of Chemistry-Climate Model Initiative (CCMI) ozone radiative flux bias from satellites Kuai L; Bowman KW; Miyazaki K; Deushi M; Revell L; Rozanov E; Paulot F; Strode S; Conley A; Lamarque J-F; Jöckel P; Plummer DA; Oman LD; Worden H; Kulawik S; Paynter D; Stenke A; Kunze M (Copernicus GmbH, 2020)The top-of-atmosphere (TOA) outgoing longwave flux over the 9.6 µm ozone band is a fundamental quantity for understanding chemistry–climate coupling. However, observed TOA fluxes are hard to estimate as they exhibit c ...