Anna E. Hogg
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View article: Using observations of surface fracture to address ill-posed ice softness estimation over Pine Island Glacier
Using observations of surface fracture to address ill-posed ice softness estimation over Pine Island Glacier Open
Numerical models used to simulate the evolution of the Antarctic Ice Sheet require the specification of basal boundary conditions on stress and local deviations in the assumed material properties of the ice. In general, scalar fields relev…
View article: Spatio-temporal melt and basal channel evolution on Pine Island Glacier ice shelf from CryoSat-2
Spatio-temporal melt and basal channel evolution on Pine Island Glacier ice shelf from CryoSat-2 Open
Ice shelves buttress the grounded ice sheet, restraining its flow into the ocean. Mass loss from these ice shelves occurs primarily through ocean-induced basal melting, with the highest melt rates occurring in regions that host basal chann…
View article: Short and Long-term Grounding Zone Dynamics of Amery Ice Shelf, East Antarctica
Short and Long-term Grounding Zone Dynamics of Amery Ice Shelf, East Antarctica Open
The detection of grounding line (GL) positions in Antarctica is crucial for investigating the stability and health of ice sheets and glaciers. In reality the GL position is not fixed and will migrate upstream or downstream in response to v…
View article: Detection of 85 new active subglacial lakes in Antarctica from a decade of CryoSat-2 data
Detection of 85 new active subglacial lakes in Antarctica from a decade of CryoSat-2 data Open
Subglacial lake activity influences ice sheet flow, grounding line discharge and ice shelf basal melting. Although 146 active subglacial lakes have been detected in Antarctica via ice surface elevation change associated with their activity…
View article: Satellite-derived steric height in the Southern Ocean: trends, variability, and climate drivers
Satellite-derived steric height in the Southern Ocean: trends, variability, and climate drivers Open
The Southern Ocean circulation plays a central role in regulating the global ocean overturning, ventilating the deep ocean, and driving sea level rise by delivering heat to Antarctic ice shelves. Understanding heat and freshwater content i…
View article: Antarctic Ice Sheet grounding line discharge from 1996–2024
Antarctic Ice Sheet grounding line discharge from 1996–2024 Open
Grounding line discharge is a key component of the mass balance of the Antarctic Ice Sheet. Here, we present a time-varying estimate of Antarctic Ice Sheet grounding line discharge, at up to monthly intervals, from 1996 through to November…
View article: Antarctic Ice Sheet grounding line discharge from 1996 to 2024
Antarctic Ice Sheet grounding line discharge from 1996 to 2024 Open
This dataset provides estimates of grounding line discharge from the Antarctic Ice Sheet and all of it's drainage basins, as described in the following pre-print (under review): Davison, B. J., Hogg, A. E., Slater, T., Rigby, R., and Hanse…
View article: Polar Ocean Mixing by Internal Tsunamis (POLOMINTS)
Polar Ocean Mixing by Internal Tsunamis (POLOMINTS) Open
Mixing of the ocean around Antarctica is a key process that exerts influences over large scales and in multiple ways. By redistributing heat in the ocean, it exerts strong influences on the Antarctic Ice Sheet, with implications for sea le…
View article: Speed-up, slowdown, and redirection of ice flow on neighbouring ice streams in the Pope, Smith, and Kohler region of West Antarctica
Speed-up, slowdown, and redirection of ice flow on neighbouring ice streams in the Pope, Smith, and Kohler region of West Antarctica Open
The ice streams feeding the Dotson and Crosson ice shelves are some of the fastest changing in West Antarctica. We use satellite observations to measure the change in ice speed and flow direction on eight ice streams in the Pope, Smith, an…
View article: Short and Long-term Grounding Zone Dynamics of Amery Ice Shelf, East Antarctica
Short and Long-term Grounding Zone Dynamics of Amery Ice Shelf, East Antarctica Open
The detection of grounding line (GL) positions in Antarctica is crucial for investigating the stability and health of ice sheets and glaciers. In reality the GL position is not fixed and will migrate upstream or downstream in response to v…
View article: Pathways of Atmospheric Rivers in the Arctic: Dynamics, Moisture Transport, and Impacts on Sea Ice during April 202
Pathways of Atmospheric Rivers in the Arctic: Dynamics, Moisture Transport, and Impacts on Sea Ice during April 202 Open
In recent decades, the Arctic has warmed nearly four times faster than the global average, undergoing profound changes as a result. A key factor in this accelerated warming is the meridional transport of atmospheric water vapour. Particula…
View article: Drivers of recent ice speed variability on Cook West Glacier, East Antarctica
Drivers of recent ice speed variability on Cook West Glacier, East Antarctica Open
Changes in flow speed of large Antarctic outlet glaciers are a key indicator of the stability of the ice sheet. West Antarctica, primarily along the Amundsen Sea facing coast, is known to be in dynamic imbalance and losing significant mass…
View article: Basal Channels on Pine Island Glacier with CryoSat-2: their formation, melt evolution and impact on buttressing.
Basal Channels on Pine Island Glacier with CryoSat-2: their formation, melt evolution and impact on buttressing. Open
Ice shelves buttress the grounded ice sheet, slowing its flow into the ocean. Mass loss from these ice shelves occurs primarily through ocean-induced basal melting, with the highest melt rates concentrated within basal channels—elongated, …
View article: Ephemeral grounding of ice-keels on Pine Island Glacier Ice Shelf: observations, modelling, and dynamic impacts.
Ephemeral grounding of ice-keels on Pine Island Glacier Ice Shelf: observations, modelling, and dynamic impacts. Open
In Antarctica, changes in ice dynamics dominate the ice sheet’s contribution to global sea-level rise. Changes to the continent’s ice shelves play a key role in this dynamic evolution through the buttressing that they provide t…
View article: Spatio-temporal melt and basal channel evolution on Pine Island Glacier ice shelf from CryoSat-2
Spatio-temporal melt and basal channel evolution on Pine Island Glacier ice shelf from CryoSat-2 Open
Ice shelves buttress the grounded ice sheet, restraining its flow into the ocean. Mass loss from these ice shelves occurs primarily through ocean-induced basal melting, with the highest melt rates occurring in regions that host basal chann…
View article: Change in grounding line location on the Antarctic Peninsula measured using a tidal motion offset correlation method
Change in grounding line location on the Antarctic Peninsula measured using a tidal motion offset correlation method Open
The grounding line position of glaciers and ice shelves is an essential observation for the study of the Earth's ice sheets. However, in some locations, such as the Antarctic Peninsula, where many grounding lines have not been mapped since…
View article: Using observations of surface fracture to address ill-posed ice softness estimation over Pine Island Glacier
Using observations of surface fracture to address ill-posed ice softness estimation over Pine Island Glacier Open
Numerical models used to simulate the evolution of the Antarctic Ice Sheet require the specification of basal boundary conditions on stress and local deviations in the assumed material properties of the ice. In general, scalar fields repre…
View article: Coincident Lake Drainage and Grounding Line Retreat at Engelhardt Subglacial Lake, West Antarctica
Coincident Lake Drainage and Grounding Line Retreat at Engelhardt Subglacial Lake, West Antarctica Open
Antarctica has an active subglacial hydrological system, with interconnected subglacial lakes fed by subglacial meltwater. Subglacial hydrology can influence basal sliding, inject freshwater into the sub‐ice‐shelf cavity, and impact sedime…
View article: Data and code for "Change in grounding line location on the Antarctic Peninsula measured using a tidal motion offset correlation method" by Wallis et al. 2024
Data and code for "Change in grounding line location on the Antarctic Peninsula measured using a tidal motion offset correlation method" by Wallis et al. 2024 Open
This data and code is made available to support the article: "Change in grounding line location on the Antarctic Peninsula measured using a tidal motion offset correlation method" by Wallis et al. 2024". Includes: TMOC method output tide c…
View article: Widespread increase in discharge from west Antarctic Peninsula glaciers since 2018
Widespread increase in discharge from west Antarctic Peninsula glaciers since 2018 Open
Many glaciers on the Antarctic Peninsula have retreated and accelerated in recent decades. Here we show that there has been a widespread, quasi-synchronous, and sustained increase in grounding line discharge from glaciers on the west coast…
View article: Speed-up, slowdown, and redirection of ice flow on neighbouring ice streams in the Pope, Smith and Kohler region of West Antarctica
Speed-up, slowdown, and redirection of ice flow on neighbouring ice streams in the Pope, Smith and Kohler region of West Antarctica Open
The ice streams feeding Dotson and Crosson Ice Shelves are some of the fastest changing in West Antarctica. We use satellite observations to measure the change in ice speed and flow direction on eight ice streams in the Pope, Smith and Koh…
View article: Determining the Freshwater Fluxes from Antarctica with Earth Observation Data, Models, and In Situ Measurements: Uncertainties, Knowledge Gaps, and Prospects for New Advances
Determining the Freshwater Fluxes from Antarctica with Earth Observation Data, Models, and In Situ Measurements: Uncertainties, Knowledge Gaps, and Prospects for New Advances Open
International audience
View article: Comment on egusphere-2023-3050
Comment on egusphere-2023-3050 Open
Abstract. The Southern Ocean plays a central role in regulating the global overturing circulation, ventilating the deep ocean, and driving sea level rise by delivering heat to Antarctic ice shelves. Understanding heat and freshwater conten…
View article: Comment on egusphere-2024-232
Comment on egusphere-2024-232 Open
Abstract. Many glaciers on the Antarctic Peninsula have retreated and accelerated in recent decades. Here we show that there was a widespread, quasi-synchronous and sustained increase in grounding line discharge from glaciers on the west c…
View article: Characterizing Subglacial Hydrology Within the Amery Ice Shelf Catchment Using Numerical Modeling and Satellite Altimetry
Characterizing Subglacial Hydrology Within the Amery Ice Shelf Catchment Using Numerical Modeling and Satellite Altimetry Open
Meltwater forms at the base of the Antarctic Ice Sheet due to geothermal heat flux (GHF) and basal frictional dissipation. Despite the relatively small volume, this water has a profound effect on ice‐sheet dynamics. However, subglacial mel…
View article: Trends in Antarctic Ice Speed 2014-2023 From Big Data Processing of Satellite Observations
Trends in Antarctic Ice Speed 2014-2023 From Big Data Processing of Satellite Observations Open
The speed at which the Antarctic Ice Sheet (AIS) flows from the continental interior to the ocean is a key indicator of its stability, and satellite-derived ice velocity measurements play a major role in our assessment of changes in ice dy…
View article: Using observations of surface fracture to address ill-posed ice softness estimation over Pine Island Glacier
Using observations of surface fracture to address ill-posed ice softness estimation over Pine Island Glacier Open
Many numerical models used to simulate ice streams require the specification of control fields representing the slipperiness of the ice/bed interface and local deviations in the assumed rheological properties of the ice. These poorly const…
View article: New Active Antarctic Subglacial Lakes using 10 years of CryoSat-2 Altimetry
New Active Antarctic Subglacial Lakes using 10 years of CryoSat-2 Altimetry Open
Subglacial lakes beneath the Antarctic Ice Sheet were first identified using airborne radio-echo sounding (RES) surveys from the 1960s. In Antarctica, 20% of 675 currently identified subglacial lakes are “active,” exhibiting dr…