- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
NARROW
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Antarctica
-
Antarctic ice sheet
-
West Antarctic ice sheet (2)
-
-
East Antarctica (1)
-
West Antarctica (2)
-
Wilkes Land
-
Law Dome (1)
-
-
-
Australasia
-
Australia
-
South Australia
-
Lake Eyre (1)
-
Lake Frome (1)
-
-
-
-
-
elements, isotopes
-
isotope ratios (1)
-
isotopes
-
stable isotopes
-
O-18/O-16 (1)
-
-
-
oxygen
-
O-18/O-16 (1)
-
-
-
geochronology methods
-
Th/U (1)
-
-
geologic age
-
Cenozoic
-
Quaternary
-
Holocene (1)
-
Pleistocene
-
upper Pleistocene (1)
-
-
upper Quaternary (1)
-
-
-
-
minerals
-
carbonates
-
aragonite (1)
-
-
-
Primary terms
-
absolute age (1)
-
Antarctica
-
Antarctic ice sheet
-
West Antarctic ice sheet (2)
-
-
East Antarctica (1)
-
West Antarctica (2)
-
Wilkes Land
-
Law Dome (1)
-
-
-
Australasia
-
Australia
-
South Australia
-
Lake Eyre (1)
-
Lake Frome (1)
-
-
-
-
Cenozoic
-
Quaternary
-
Holocene (1)
-
Pleistocene
-
upper Pleistocene (1)
-
-
upper Quaternary (1)
-
-
-
climate change (1)
-
crust (1)
-
data processing (1)
-
deformation (1)
-
geomorphology (1)
-
geophysical methods (4)
-
glacial geology (3)
-
ground water (1)
-
hydrology (3)
-
isotopes
-
stable isotopes
-
O-18/O-16 (1)
-
-
-
oxygen
-
O-18/O-16 (1)
-
-
paleoclimatology (1)
-
paleogeography (1)
-
permafrost (2)
-
sedimentation (1)
-
sediments
-
carbonate sediments (1)
-
clastic sediments
-
boulders (1)
-
till (1)
-
-
-
stratigraphy (1)
-
-
sedimentary rocks
-
oolite (1)
-
-
sediments
-
oolite (1)
-
sediments
-
carbonate sediments (1)
-
clastic sediments
-
boulders (1)
-
till (1)
-
-
-
Antarctic subglacial groundwater: a concept paper on its measurement and potential influence on ice flow
Abstract Is groundwater abundant in Antarctica and does it modulate ice flow? Answering this question matters because ice streams flow by gliding over a wet substrate of till. Water fed to ice-stream beds thus influences ice-sheet dynamics and, potentially, sea-level rise. It is recognized that both till and the sedimentary basins from which it originates are porous and could host a reservoir of mobile groundwater that interacts with the subglacial interfacial system. According to recent numerical modelling, up to half of all water available for basal lubrication, and time lags between hydrological forcing and ice-sheet response as long as millennia, may have been overlooked in models of ice flow. Here, we review evidence in support of Antarctic groundwater and propose how it can be measured to ascertain the extent to which it modulates ice flow. We present new seismoelectric soundings of subglacial till, and magnetotelluric and transient electromagnetic forward models of subglacial groundwater reservoirs. We demonstrate that multifaceted and integrated geophysical datasets can detect, delineate and quantify the groundwater contents of subglacial sedimentary basins and, potentially, monitor groundwater exchange rates between subglacial till layers. The paper thus describes a new area of glaciological investigation and how it should progress in future.
Abstract Rare jökulhlaup events, also known as subglacial lake outburst flood events, have been observed at the Law Dome ice margin and provide an insight into the physical characteristics of subglacial meltwater and drainage. The subglacial topography based on data from the BEDMAP2 and ICECAP projects, together with subsurface transects of the ice margin obtained using ground-penetrating radar, reveal several lakes and lake-like depressions and the drainage pathways of two jökulhlaup events. Oxygen isotope typing of the meltwater during the most recent (2014) jökulhlaup event, combined with ice margin stratigraphy, enable the identification of ice tunnel melt pathways that exploit the 30–90° dipping basal ice layering. The presence of subglacial meltwater beneath Law Dome during the Holocene to Glacial periods is confirmed by the dendritic drainage pattern in the subglacial morphology and extensive layers of basal regelation ice and subglacial carbonate precipitate deposits found within the Løken Moraines sediments. These subglacial carbonates, including ooid layers, formed from the mixing of glacial meltwater and seawater at 72 ka BP. The combined evidence indicates that the ocean discharge of subglacial meltwater may be variable and/or is periodically blocked by basal freezing events near the ice sheet terminus.