Výsledky vyhledávání - "ROMAN J. MOTYKA"

Akademický článek

Persistent overcut regions dominate the terminus morphology of a rapidly melting tidewater glacier

Autor: Nicole Abib, David A. Sutherland, Jason M. Amundson, Dan Duncan, Emily F. Eidam, Rebecca H. Jackson, Christian Kienholz, Mathieu Morlighem, Roman J. Motyka, Jonathan D. Nash, Bridget Ovall, Erin C. Pettit

Publikováno v: Annals of Glaciology, Vol 64, Pp 1-12 (2023)

Frontal ablation, the combination of submarine melting and iceberg calving, changes the geometry of a glacier's terminus, influencing glacier dynamics, the fate of upwelling plumes and the distribution of submarine meltwater input into the ocean. Dir

Externí odkaz: https://doaj.org/article/8a724f67bdcd4b6bb16595b09e827016

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Akademický článek

Sediment redistribution beneath the terminus of an advancing glacier, Taku Glacier (T'aakú Kwáan Sít'i), Alaska

Autor: Jenna M. Zechmann, Martin Truffer, Roman J. Motyka, Jason M. Amundson, Chris F. Larsen

Publikováno v: Journal of Glaciology, Vol 67, Pp 204-218 (2021)

The recently-advancing Taku Glacier is excavating subglacial sediments at high rates over multi-decadal timescales. However, sediment redistribution over shorter timescales remains unquantified. We use a variety of methods to study subglacial and pro

Externí odkaz: https://doaj.org/article/3a6c44ad943e44e2b01954e601632912

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Akademický článek

Formation, flow and break-up of ephemeral ice mélange at LeConte Glacier and Bay, Alaska

Autor: Jason M. Amundson, Christian Kienholz, Alexander O. Hager, Rebecca H. Jackson, Roman J. Motyka, Jonathan D. Nash, David A. Sutherland

Publikováno v: Journal of Glaciology, Vol 66, Pp 577-590 (2020)

Ice mélange has been postulated to impact glacier and fjord dynamics through a variety of mechanical and thermodynamic couplings. However, observations of these interactions are very limited. Here, we report on glaciological and oceanographic data t

Externí odkaz: https://doaj.org/article/a6957052ff05490297aae7e9a9423256

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Akademický článek

Tracking icebergs with time-lapse photography and sparse optical flow, LeConte Bay, Alaska, 2016–2017

Autor: CHRISTIAN KIENHOLZ, JASON M. AMUNDSON, ROMAN J. MOTYKA, REBECCA H. JACKSON, JOHN B. MICKETT, DAVID A. SUTHERLAND, JONATHAN D. NASH, DYLAN S. WINTERS, WILLIAM P. DRYER, MARTIN TRUFFER

Publikováno v: Journal of Glaciology, Vol 65, Pp 195-211 (2019)

We present a workflow to track icebergs in proglacial fjords using oblique time-lapse photos and the Lucas-Kanade optical flow algorithm. We employ the workflow at LeConte Bay, Alaska, where we ran five time-lapse cameras between April 2016 and Septe

Externí odkaz: https://doaj.org/article/9fe0fd4389f14ef6b160ac48b7455bc6

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Akademický článek

Asynchronous behavior of outlet glaciers feeding Godthåbsfjord (Nuup Kangerlua) and the triggering of Narsap Sermia's retreat in SW Greenland

Autor: ROMAN J. MOTYKA, RYAN CASSOTTO, MARTIN TRUFFER, KRISTIAN K. KJELDSEN, DIRK VAN AS, NIELS J. KORSGAARD, MARK FAHNESTOCK, IAN HOWAT, PETER L. LANGEN, JOHN MORTENSEN, KUNUK LENNERT, SØREN RYSGAARD

Publikováno v: Journal of Glaciology, Vol 63, Pp 288-308 (2017)

We assess ice loss and velocity changes between 1985 and 2014 of three tidewater and five-land terminating glaciers in Godthåbsfjord (Nuup Kangerlua), Greenland. Glacier thinning accounted for 43.8 ± 0.2 km3 of ice loss, equivalent to 0.10 mm eusta

Externí odkaz: https://doaj.org/article/760060607439430c8694dae951c7fff6

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