Results 21 to 30 of about 28,822 (198)

Brief communication: Improved simulation of the present-day Greenland firn layer (1960–2016) [PDF]

The Cryosphere, 2018
By providing pore space for storage or refreezing of meltwater, the Greenland ice sheet firn layer strongly modulates runoff. Correctly representing the firn layer is therefore crucial for Greenland (surface) mass balance studies.
S. R. M. Ligtenberg, P. Kuipers Munneke, B. P. Y. Noël, M. R. van den Broeke   +3 more
doaj   +1 more source

Chlorine isotope composition in chlorofluorocarbons CFC-11, CFC-12 and CFC-113 in firn, stratospheric and tropospheric air [PDF]

, 2014
The stratospheric degradation of chlorofluorocarbons (CFCs) releases chlorine, which is a major contributor to the destruction of stratospheric ozone (O3).
Allin, S. J., Blunier, T., Capron, E., Dennis, P., Fraser, P. J., Kaiser, J., Langenfelds, R. L., Laube, J. C., Martinerie, P., Mckenna, E., Mulvaney, R., Röckmann, T., Schwander, J., Sturges, W. T., Witrant, E.   +14 more
core   +16 more sources

Physical limits to meltwater penetration in firn

Journal of Glaciology, 2021
Processes governing meltwater penetration into cold firn remain poorly constrained. Here, in situ experiments are used to develop a grain-scale model to investigate physical limitations on meltwater infiltration in firn.
Neil F. Humphrey, Joel T. Harper, Toby W. Meierbachtol   +2 more
doaj   +1 more source

Hot water drilling in the firn layer of Greenland's percolation zone

Annals of Glaciology, 2021
The intermixed thermal and structural framework of cold firn, water-saturated firn and ice layers in Greenland's percolation zone can be challenging to penetrate with core drills.
Neil Humphrey, Joel Harper, Toby Meierbachtol   +2 more
doaj   +1 more source

The firn meltwater Retention Model Intercomparison Project (RetMIP): evaluation of nine firn models at four weather station sites on the Greenland ice sheet [PDF]

The Cryosphere, 2020
Perennial snow, or firn, covers 80 % of the Greenland ice sheet and has the capacity to retain surface meltwater, influencing the ice sheet mass balance and contribution to sea-level rise.
B. Vandecrux, B. Vandecrux, R. Mottram, P. L. Langen, P. L. Langen, R. S. Fausto, M. Olesen, C. M. Stevens, V. Verjans, A. Leeson, S. Ligtenberg, S. Ligtenberg, P. Kuipers Munneke, S. Marchenko, W. van Pelt, C. R. Meyer, S. B. Simonsen, A. Heilig, S. Samimi, S. Marshall, H. Machguth, M. MacFerrin, M. Niwano, O. Miller, C. I. Voss, J. E. Box   +25 more
doaj   +1 more source

A new multi-gas constrained model of trace gas non-homogeneous transport in firn: evaluation and behaviour at eleven polar sites [PDF]

, 2012
Insoluble trace gases are trapped in polar ice at the firn-ice transition, at approximately 50 to 100 m below the surface, depending primarily on the site temperature and snow accumulation.
Blunier, T., Capron, E., Dlugokencky, E. J., Etheridge, D., Hogan, C., Kawamura, K., Laube, J. C., Martinerie, P., Montzka, S. A., Sturges, W. T., Witrant, E.   +10 more
core   +3 more sources

Water content of firn at Lomonosovfonna, Svalbard, derived from subsurface temperature measurements

Journal of Glaciology, 2021
The potential of capillary forces to retain water in pores is an important property of snow and firn at glaciers. Meltwater suspended in pores does not contribute to runoff and may refreeze during winter, which can affect the climatic mass balance and ...
Sergey A. Marchenko, Ward J. J. van Pelt, Rickard Pettersson, Veijo A. Pohjola, Carleen H. Reijmer   +4 more
doaj   +1 more source

Climate Effects on Firn Permeability Are Preserved Within a Firn Column [PDF]

Journal of Geophysical Research: Earth Surface, 2019
AbstractWe have investigated the impacts of short‐term climatic events on firn‐permeability evolution, by analyzing density and permeability measurements from the NEEM 2009 S2 firn core from the North Greenland Eemian Ice Drilling (NEEM) site in Greenland.
K. M. Keegan, M. R. Albert, J. R. McConnell, I. Baker   +3 more
openaire   +1 more source

Change of the glaciation dimensions in the basins of Malaya Laba and Belaya Rivers (West Caucasus) for the last hundred years

Лëд и снег, 2015
Changes in area of glaciation and quantity of individual glaciers in basins of rivers Malaya Laba and Belaya (West Caucasus) are investigated. The Glacier Inventories of 1911 [19] and 1967 [10] and space imagery for 2000–2012 are used as the base ...
Yu. V. Efremov, Yu. G. Ilyichev, A. V. Zimnitsky   +2 more
doaj   +1 more source

A 60 yr record of atmospheric carbon monoxide reconstructed from Greenland firn air [PDF]

, 2012
We present the first reconstruction of the Northern Hemisphere (NH) high latitude atmospheric carbon monoxide (CO) mole fraction from Greenland firn air.
Battle, M. O., Blunier, T., Chappellaz, J., Etheridge, D. M., Forster, G., Hammer, S., Kaiser, J., Lamarque, J.-F., Lang, P., Langenfelds, R. L., Levin, I., Mak, J., Martinerie, P., Novelli, P., Petrenko, V. V., Petron, G., Schwander, J., Severinghaus, J. P., Steele, L. P., Steffen, K., Sturges, W. T., Wang, Z., White, J. W. C., Witrant, E.   +23 more
core   +5 more sources