Joseph A MacGregor
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Explore the profile of Joseph A MacGregor including associated specialties, affiliations and a list of published articles.
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8
Citations
50
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Recent Articles
1.
Pritchard H, Fretwell P, Fremand A, Bodart J, Kirkham J, Aitken A, et al.
Sci Data
. 2025 Mar;
12(1):414.
PMID: 40064916
We present Bedmap3, the latest suite of gridded products describing surface elevation, ice-thickness and the seafloor and subglacial bed elevation of the Antarctic south of 60 °S. Bedmap3 incorporates and...
2.
Kenny G, Hyde W, Storey M, Garde A, Whitehouse M, Beck P, et al.
Sci Adv
. 2022 Mar;
8(10):eabm2434.
PMID: 35263140
The ~31-km-wide Hiawatha structure, located beneath Hiawatha Glacier in northwestern Greenland, has been proposed as an impact structure that may have formed after the Pleistocene inception of the Greenland Ice...
3.
Bessette J, Schroeder D, Jordan T, MacGregor J
Geophys Res Lett
. 2021 Jul;
48(10):e2020GL091432.
PMID: 34219826
Radar-sounding surveys associated with the discovery of a large impact crater beneath Hiawatha Glacier, Greenland, revealed bright, flat subglacial reflections hypothesized to originate from a subglacial groundwater table. We test...
4.
Johnson J, Jezek K, Macelloni G, Brogioni M, Tsang L, Dinnat E, et al.
IEEE J Sel Top Appl Earth Obs Remote Sens
. 2021 Jul;
14:4894-4914.
PMID: 34211622
Microwave radiometry has provided valuable spaceborne observations of Earth's geophysical properties for decades. The recent SMOS, Aquarius, and SMAP satellites have demonstrated the value of measurements at 1400 MHz for...
5.
Karlsson N, Solgaard A, Mankoff K, Gillet-Chaulet F, MacGregor J, Box J, et al.
Nat Commun
. 2021 Jun;
12(1):3461.
PMID: 34103508
The Greenland ice sheet has been one of the largest sources of sea-level rise since the early 2000s. However, basal melt has not been included explicitly in assessments of ice-sheet...
6.
Kjaer K, Larsen N, Binder T, Bjork A, Eisen O, Fahnestock M, et al.
Sci Adv
. 2018 Nov;
4(11):eaar8173.
PMID: 30443592
We report the discovery of a large impact crater beneath Hiawatha Glacier in northwest Greenland. From airborne radar surveys, we identify a 31-kilometer-wide, circular bedrock depression beneath up to a...
7.
MacGregor J, Fahnestock M, A Catania G, Aschwanden A, Clow G, Colgan W, et al.
J Geophys Res Earth Surf
. 2017 Feb;
121(7):1328-1350.
PMID: 28163988
The basal thermal state of an ice sheet (frozen or thawed) is an important control upon its evolution, dynamics and response to external forcings. However, this state can only be...
8.
MacGregor J, Colgan W, Fahnestock M, Morlighem M, A Catania G, Paden J, et al.
Science
. 2016 Feb;
351(6273):590-3.
PMID: 26912699
Recent peripheral thinning of the Greenland Ice Sheet is partly offset by interior thickening and is overprinted on its poorly constrained Holocene evolution. On the basis of the ice sheet's...
9.
MacGregor J, Fahnestock M, A Catania G, Paden J, Gogineni S, Young S, et al.
J Geophys Res Earth Surf
. 2015 Jul;
120(2):212-241.
PMID: 26213664
Key Points: Phase information predicts reflection slope and simplifies reflection tracingReflections can be dated away from ice cores using a simple ice flow modelRadiostratigraphy is often disrupted near the onset...