Zobrazeno 1 - 10
of 301
pro vyhledávání: '"Polar firn"'
Autor:
Emma Pearce, Adam D. Booth, Sebastian Rost, Paul Sava, Tuğrul Konuk, Alex Brisbourne, Bryn Hubbard, Ian Jones
Publikováno v:
Journal of Glaciology, Vol 69, Pp 1419-1433 (2023)
The density structure of firn has implications for hydrological and climate modelling, and ice-shelf stability. The structure of firn can be evaluated from depth models of seismic velocity, widely obtained with Herglotz–Wiechert inversion (HWI), an
Externí odkaz:
https://doaj.org/article/3d33748a7d6d42c7a0a45387f71677bb
Autor:
Eric Cicero, Kristin Poinar, Renette Jones-Ivey, Alek A. Petty, Jeanette M. Sperhac, Abani Patra, Jason P. Briner
Publikováno v:
Journal of Glaciology, Vol 69, Pp 1379-1392 (2023)
In Southeast Greenland, summer melt and high winter snowfall rates give rise to firn aquifers: vast stores of meltwater buried beneath the ice-sheet surface. Previous detailed studies of a single Greenland firn aquifer site suggest that the water dra
Externí odkaz:
https://doaj.org/article/bedc1598ce654128963d68be3a169e0f
Autor:
Nander Wever, Eric Keenan, Charles Amory, Michael Lehning, Armin Sigmund, Hendrik Huwald, Jan T. M. Lenaerts
Publikováno v:
Journal of Glaciology, Vol 69, Pp 823-840 (2023)
Owing to drifting snow processes, snow accumulation and surface density in polar environments are variable in space and time. We present new field data of manual measurements, repeat terrestrial laser scanning and snow micro-penetrometry from Dronnin
Externí odkaz:
https://doaj.org/article/b984331f2f354fa787fd3d71b1a7127a
Publikováno v:
Annals of Glaciology, Vol 64, Pp 63-66 (2023)
Deciphering the localisation of solid and dissolved impurities on the micron-scale in glacial ice remains a challenge, but is critical to understand the integrity of ice core records and internal deformation. Here we report on the state-of-the-art in
Externí odkaz:
https://doaj.org/article/b12660223c89451a992b36aa658c9ecd
Autor:
Olivia Miller, Clifford I. Voss, D. Kip Solomon, Clément Miège, Richard Forster, Nicholas Schmerr, Lynn Montgomery
Publikováno v:
Journal of Glaciology, Vol 69, Pp 607-622 (2023)
A conceptual model, based on field observations and assumed physics of a perennial firn aquifer near Helheim Glacier (southeast Greenland), is evaluated via steady-state 2-D simulation of liquid water flow and energy transport with phase change. The
Externí odkaz:
https://doaj.org/article/5cb9fa3533c3462193a1a4a08f7c7100
Publikováno v:
Journal of Glaciology, Vol 69, Pp 164-178 (2023)
Increased surface melt in the percolation zone of the Greenland ice sheet causes significant changes in the firn structure, directly affecting the amount and timing of meltwater runoff. Here we force an energy-balance model with automatic weather sta
Externí odkaz:
https://doaj.org/article/775c476a8eb44f3985694145b3f94a3a
Publikováno v:
Journal of Glaciology, Vol 69, Pp 191-203 (2023)
The marginal areas of the Greenland ice sheet develop streams and lakes each summer, documenting that surface runoff of meltwater is a major component of ice-sheet mass balance. Here we map the slush limit, a proxy for the extent of surface runoff, u
Externí odkaz:
https://doaj.org/article/e4fb2fe0a1524a62a537d4530d273d25
Autor:
Simon E. Oster, Mary R. Albert
Publikováno v:
Journal of Glaciology, Vol 68, Pp 1141-1148 (2022)
The vast Greenland and Antarctic Ice Sheets are covered by many tens of meters of polar firn, which is snow that is years to centuries old and has experienced significant metamorphism. Both ice-sheet modeling and decoding satellite data require knowl
Externí odkaz:
https://doaj.org/article/9f4437d14a124af9baea2d632e69cbe1
Autor:
Emma Pearce, Adam D. Booth, Sebastian Rost, Paul Sava, Tuğrul Konuk, Alex Brisbourne, Bryn Hubbard, Ian Jones
Publikováno v:
Annals of Glaciology, Vol 63, Pp 44-48 (2022)
The density structure of firn has implications for hydrological and climate modelling and for ice shelf stability. The firn structure can be evaluated from depth models of seismic velocity, widely obtained with Herglotz-Wiechert inversion (HWI), an a
Externí odkaz:
https://doaj.org/article/564695c1917f4dfb9c48547917a488d8
Publikováno v:
Journal of Glaciology, Vol 68, Pp 785-798 (2022)
Firn is the pervasive surface material across Antarctica, and its structures reflect its formation and history in response to environmental perturbations. In addition to the role of firn in thermally isolating underlying glacial ice, it defines near-
Externí odkaz:
https://doaj.org/article/66f8d7babb874f8c9d49f7ad9ad5d329