Results 81 to 90 of about 27,505 (199)

Rapid growth of HFC-227ea (1,1,1,2,3,3,3-Heptafluoropropane) in the atmosphere [PDF]

, 2010
We report the first measurements of 1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea), a substitute for ozone depleting compounds, in remote regions of the atmosphere and present evidence for its rapid growth. Observed mixing ratios ranged from below 0.01 ppt
Blunier, Thomas, Bolder, Michel, Brenninkmeijer, Carl, Bönisch, Harald, Engel, Andreas, Laube, Johannes Christian, Martinerie, Patricia, Mills, Graham, Newland, Mike J., Oram, David, Reeves, Claire E., Röckmann, Thomas, Schuck, Tanja J., Schwander, Jakob, Sturges, William T., Veen, Cornelis J. van der, Witrant, Emmanuel   +16 more
core  

Thermal tracing of retained meltwater in the lower accumulation area of the Southwestern Greenland ice sheet

Annals of Glaciology, 2016
We present in situ firn temperatures from the extreme 2012 melt season in the southwestern lower accumulation area of the Greenland ice sheet. The upper 2.5 m of snow and firn was temperate during the melt season, when vertical meltwater percolation was ...
Charalampos Charalampidis, Dirk Van As, William T. Colgan, Robert S. Fausto, Michael Macferrin, Horst Machguth   +5 more
doaj   +1 more source

Relationships between synoptic-scale transport and interannual variability of inorganic cations in surface snow at Summit, Greenland: 1992-1996 [PDF]

, 2001
To fully utilize the long-term chemical records retrieved from central Greenland ice cores, specific relationships between atmospheric circulation and the variability of chemical species in the records need to be better understood. This research examines
Dibb, Jack E., Kahl, D W, Keim, Barry D, Slater, J F   +3 more
core   +1 more source

Monitoring firn and wet snow on mountain glaciers: polarization and orbit effects

Geo-spatial Information Science
Mountain glaciers are sensitive to climate variability and can be of great importance for downstream populations due to their hydrological significance. Synthetic Aperture Radar (SAR) images are often used to monitor the characteristics of glaciers based
Ying Huang, Lei Huang, Tobias Bolch
doaj   +1 more source

Measurement of acoustic properties of South Pole ice for neutrino astronomy

, 2008
South Pole ice is predicted to be the best medium for acoustic neutrino detection. Moreover, ice is the only medium in which all three dense-medium detection methods (optical, radio, and acoustic) can be used to monitor the same interaction volume ...
Ackermann, Albert, Besson, Justin Vandenbroucke, Kravchenko, Price, Ringwald, Vandenbroucke, Weihaupt, Weiler   +9 more
core   +1 more source

Why Firn Quakes

Geophysical Research Letters
Snow dampens sounds, but anecdotal reports concisely describe audible propagating collapse events—firnquakes—in Antarctic and Arctic snowfields. We propose combining granular and continuum mechanics to form a testable theory for conditioning, triggering,
A. Voigtländer, B. Gee
doaj   +1 more source

Mechanisms for upstream migration of firn aquifer drainage: preliminary observations from Helheim Glacier, Greenland

Journal of Glaciology
Surface meltwater can influence subglacial hydrology and ice dynamics if it reaches ice sheet's base. Firn aquifers store meltwater and drain into wide crevasses marking the aquifer's downstream boundary, indicating water from firn aquifers can drive ...
Jessica Z. Mejia, Kristin Poinar, Colin R. Meyer, Aleah N. Sommers, Winnie Chu   +4 more
doaj   +1 more source

Direct measurements of firn-density evolution from 2016 to 2022 at Wolverine Glacier, Alaska

Journal of Glaciology
Knowledge of snow and firn-density change is needed to use elevation-change measurements to estimate glacier mass change. Additionally, firn-density evolution on glaciers is closely connected to meltwater percolation, refreezing and runoff, which are key
C. Max Stevens, Louis Sass, Caitlyn Florentine, Christopher McNeil, Emily Baker, Katherine Bollen   +5 more
doaj   +1 more source

Current situation of glacier and snow glades in the southern mountain area of Lesser Caucasus province

Вісник Харківського національного університету імені В.Н. Каразіна. Серія Геологія. Географія. Екологія
Problem definition. The rise in air temperature due to the impact of global warming causes the melting of glaciers in mountainous regions and accelerates freshwater scarcity in lowland areas.
Джамал Гусейнов, Аллахверді Тагієв   +1 more
doaj   +1 more source

Antarctic-wide ice-shelf firn emulation reveals robust future firn air depletion signal for the Antarctic Peninsula

Communications Earth & Environment
Antarctic firn is critical for ice-shelf stability because it stores meltwater that would otherwise pond on the surface. Ponded meltwater increases the risk of hydrofracture and subsequent potential ice-shelf collapse.
Devon Dunmire, Nander Wever, Alison F. Banwell, Jan T. M. Lenaerts   +3 more
doaj   +1 more source