A5018242650- Cryospheric studies and observations
- Winter Sports Injuries and Performance
- Geology and Paleoclimatology Research
- Polar Research and Ecology
- Arctic and Antarctic ice dynamics
- Landslides and related hazards
- Climate change and permafrost
- Methane Hydrates and Related Phenomena
- Geomagnetism and Paleomagnetism Studies
- Atmospheric and Environmental Gas Dynamics
- Planetary Science and Exploration
- Spacecraft Design and Technology
- Astro and Planetary Science
- Geological and Geochemical Analysis
- Adventure Sports and Sensation Seeking
- Geophysical and Geoelectrical Methods
- Geochemistry and Geologic Mapping
- Geophysics and Gravity Measurements
- Geological Studies and Exploration
- Seismic Waves and Analysis
- Spacecraft and Cryogenic Technologies
- Calibration and Measurement Techniques
- Distributed systems and fault tolerance
- Aerospace Engineering and Energy Systems
- Spacecraft Dynamics and Control
The University of Texas at Austin
2016-2025
University of California, San Diego
2020-2025
Scripps Institution of Oceanography
2020-2025
Hokkaido University
2024
Australian Antarctic Division
2024
University of Tasmania
2024
University of Texas Institute for Geophysics
2013-2021
Mass loss from the West Antarctic ice shelves and glaciers has been linked to basal melt by ocean heat flux. The Totten Ice Shelf in East Antarctica, which buttresses a marine-based sheet with volume equivalent at least 3.5 m of global sea-level rise, also experiences rapid melt, but role forcing was not known because lack observations near shelf. Observations calving front confirm that (0.22 ± 0.07) × 106 m3 s-1 warm water enters cavity through newly discovered deep channel. transport into...
Abstract The Southern Ocean surrounding Antarctica is a region that key to range of climatic and oceanographic processes with worldwide effects, characterised by high biological productivity biodiversity. Since 2013, the International Bathymetric Chart (IBCSO) has represented most comprehensive compilation bathymetry for south 60°S. Recently, IBCSO Project combined its efforts Nippon Foundation – GEBCO Seabed 2030 supporting goal mapping world’s oceans 2030. New datasets initiated second...
Abstract We present Bedmap3, the latest suite of gridded products describing surface elevation, ice-thickness and seafloor subglacial bed elevation Antarctic south 60 °S. Bedmap3 incorporates adds to all post-1950s datasets previously used for Bedmap2, including 84 new aero-geophysical surveys by 15 data providers, an additional 52 million points 1.9 line-kilometres measurement. These efforts have filled notable gaps in major mountain ranges deep interior East Antarctica, along West...
Wilkes Land is a key region for studying the configuration of Gondwana and appreciating role tectonic boundary conditions on East Antarctic Ice Sheet (EAIS) behavior. Despite this importance, it remains one largest regions Earth where we lack basic knowledge geology. New magnetic, gravity, subglacial topography data allow region's first comprehensive geological interpretation. We map lithospheric domains their bounding faults, including suture between Indo-Antarctica Australo-Antarctica....
Abstract The second generation Antarctic magnetic anomaly compilation for the region south of 60°S includes some 3.5 million line‐km aeromagnetic and marine data that more than doubles initial map's near‐surface database. For new compilation, sets were corrected International Geomagnetic Reference Field, diurnal effects, high‐frequency errors leveled, gridded, stitched together. further constrain crustal architecture geological evolution Peninsula West Rift System in Antarctica, as well...
Abstract The National Aeronautics and Space Administration (NASA)’s Operation IceBridge (OIB) was a 13‐year (2009–2021) airborne mission to survey land sea ice across the Arctic, Antarctic, Alaska. Here, we review OIB’s goals, instruments, campaigns, key scientific results, implications for future investigations of cryosphere. primary goal use laser altimetry bridge gap in fine‐resolution elevation measurements from space between conclusion NASA’s Ice, Cloud, Elevation Satellite (ICESat;...
Ice shelves control sea-level rise through frictional resistance, which slows the seaward flow of grounded glacial ice. Evidence from around Antarctica indicates that ice are thinning and weakening, primarily driven by warm ocean water entering into shelf cavities. We have identified a mechanism for destabilization where basal channels underneath cause drives fracture perpendicular to flow. These also result in surface deformation, diverts supraglacial rivers transverse fractures. report...
Abstract. One of the key components this research has been mapping Antarctic bed topography and ice thickness parameters that are crucial for modelling flow hence predicting future loss ensuing sea level rise. Supported by Scientific Committee on Research (SCAR), Bedmap3 Action Group aims not only to produce new gridded maps international scientific community, but also standardize make available all geophysical survey data points used in producing Bedmap products. Here, we document latest...
Abstract Subglacial lakes are an established and important component of the basal hydrological system Antarctic ice sheets, but none have been reported from Greenland. Here we present airborne radio echo sounder (RES) measurements that provide first clear evidence for existence subglacial in Two lakes, with areas ~8 ~10 km 2 , found northwest sector sheet, ~40 margin, below 757 809 m ice, respectively. The setting Greenland differs those being beneath relatively thin cold pointing to a...
Abstract A large volume of the East Antarctic Ice Sheet drains through Totten Glacier (TG) and is thought to be a potential source substantial global sea-level rise over coming centuries. We show that surface velocity height floating part TG, which buttresses grounded component, have varied substantially two decades (1989–2011), with variations in strongly anti-correlated simulated basal melt rates ( r = 0.70, p < 0.05). Coupled glacier–ice shelf simulations confirm ice flow thickness...
A possible analog for saline lakes on planetary ice bodies lurks beneath a Canadian Arctic cap.
Abstract. Antarctica's Getz Ice Shelf has been rapidly thinning in recent years, producing more meltwater than any other ice shelf the world. The influx of fresh water is known to substantially influence ocean circulation and biological productivity, but relatively little about factors controlling basal melt rate or how spatially distributed beneath shelf. Also unknown relative importance subglacial discharge from grounded sheet contributing export cavity. Here we compare observed spatial...
Abstract. We present a topographic digital elevation model (DEM) for Princess Elizabeth Land (PEL), East Antarctica. The DEM covers an area of ∼900 000 km2 and was built from radio-echo sounding data collected during four campaigns since 2015. Previously, to generate the Bedmap2 product, PEL's bed characterized low-resolution satellite gravity across otherwise large (>200 km wide) data-free zone. use mass conservation (MC) method produce ice thickness grid faster flowing (>30 m yr−1)...
Abstract The Totten ice shelf (TIS) in East Antarctica has received increasing attention recent years due to high basal melt rates, which have been linked a presence of warm modified Circumpolar Deep Water (mCDW) observed at the front. We show that mCDW on‐shelf intrusions towards TIS strengthen when Antarctic Slope Current (ASC) weakens. This demonstrates ASC blocking effect and weakening leads intrusions, as proposed by previous observational studies. interannual variability is controlled...
The Totten Glacier in East Antarctica, with an ice volume equivalent to >3.5 m of global sea-level rise, is grounded below sea level and, therefore, vulnerable ocean forcing. Here, we use bathymetric and oceanographic observations from previously unsampled parts the continental shelf reveal on-shelf warm water pathways defined by deep topographic features. Access Ice Shelf (TIS) cavity facilitated a break, broad depression on shelf, cyclonic circulation that carries inner troughs provide...
Ice shelf basal melting is the primary mechanism driving mass loss from Antarctic Sheet, yet it unknown how localized melt enhancement subglacial discharge will affect future glacial retreat. We develop a parameterization of ice that accounts for both ocean and forcing apply in projections Denman Scott Glaciers, East Antarctica, through 2300. In forward simulations, accelerates onset retreat these systems into deepest continental trench on Earth by 25 years. During this retreat, Glacier...
Abstract Recent studies have revealed the presence of a complex freshwater system underlying Aurora Subglacial Basin (ASB), region East Antarctica that contains ∼7 m global sea level potential in ice mainly grounded below level. However, impact subglacial has on driving evolution dynamic outlet glaciers drain this basin yet to be tested coupled sheet‐subglacial hydrology numerical modeling framework. Here, we project primary draining ASB (Moscow University Ice Shelf, Totten, Vanderford, and...
Over the period 2003-2008, Totten Ice Shelf (TIS) was shown to be rapidly thinning, likely due basal melting. However, a recent study using longer time series found high interannual variability present in TIS surface elevation without any apparent trend. Here we show that low-frequency intrinsic ocean potentially accounts for large fraction of melting TIS. Specifically, numerical model simulations up 44% modelled 1-5 year timescale (and 21% 5-10 timescale) is intrinsic, with similar response...
The subglacial landscape of Princess Elizabeth Land (PEL) in East Antarctica is poorly known due to a paucity ice thickness measurements.This problematic given its importance for understanding sheet dynamics and climate evolution.To address this issue, we describe the topography beneath by assuming that surface expressions satellite imagery relate large-scale features.We find evidence large, previously undiscovered drainage network hidden PEL.We interpret discrete feature 140 × 20 km plan...
Abstract. The discovery of Antarctica's deepest subglacial trough beneath the Denman Glacier, combined with high rates basal melt at grounding line, has caused significant concern over its vulnerability to retreat. Recent attention therefore been focusing on understanding controls driving Glacier's dynamic evolution. Here we consider Shackleton system, comprised Ice Shelf, and adjacent Scott, Northcliff, Roscoe Apfel glaciers, about which almost nothing is known. We widen context previously...