Results 11 to 20 of about 795 (198)

Trends of halon gases in polar firn air: implications for their emission distributions [PDF]

Atmospheric Chemistry and Physics, 2005
Four halons (H-1301, H-1211, H-2402 and H-1202) have been measured in air samples collected from polar firn from Dome Concordia (Dome C), Antarctica, from Devon Island, Canada and the North Greenland Ice Core Project (NGRIP) site, Greenland. H-2402 and H-
C. E. Reeves, W. T. Sturges, G. A. Sturrock, K. Preston, D. E. Oram, J. Schwander, R. Mulvaney, J.-M. Barnola, J. Chappellaz   +8 more
doaj   +3 more sources

Long-lived halocarbon trends and budgets from atmospheric chemistry modelling constrained with measurements in polar firn [PDF]

Atmospheric Chemistry and Physics, 2009
The budgets of seven halogenated gases (CFC-11, CFC-12, CFC-113, CFC-114, CFC-115, CCl₄ and SF₆) are studied by comparing measurements in polar firn air from two Arctic and three Antarctic sites, and ...
P. Martinerie, E. Nourtier-Mazauric, J.-M. Barnola, W. T. Sturges, D. R. Worton, E. Atlas, L. K. Gohar, K. P. Shine, G. P. Brasseur   +8 more
doaj   +3 more sources

Microwave Emissivity and Accumulation Rate of Polar Firn [PDF]

Journal of Glaciology, 1977
AbstractRadiative transfer theory is formulated to permit a meaningful definition of emissivity for bulk emitting media such as snow. The emissivity in the Rayleigh-Jeans approximation is then the microwave brightness temperature TB divided by an effective physical temperature 〈T〉.
H. Jay Zwally
openalex   +2 more sources

Local Weather Conditions Create Structural Differences between Shallow Firn Columns at Summit, Greenland and WAIS Divide, Antarctica

Atmosphere, 2020
Understanding how physical characteristics of polar firn vary with depth assists in interpreting paleoclimate records and predicting meltwater infiltration and storage in the firn column.
Ian E McDowell, Mary R Albert, Kaitlin M Keegan   +2 more
exaly   +3 more sources

A Micro-Mechanical Model for the Transformation of Dry Polar Firn Into Ice Using the Level-Set Method

Frontiers in Earth Science, 2020
Interpretation of greenhouse gas records in polar ice cores requires a good understanding of the mechanisms controlling gas trapping in polar ice, and therefore of the processes of densification and pore closure in firn (compacted snow).
Kevin Fourteau, Fabien Gillet-Chaulet, Patricia Martinerie   +2 more
exaly   +3 more sources

Kinematic waves in polar firn stratigraphy [PDF]

Journal of Glaciology, 2011
AbstractRadar studies of firn on the ice sheets have revealed complex folds on its internal layering that form from the interplay of snow accumulation and ice flow. A mathematical theory for these fold structures is presented, for the case where the radar cross section lies along the ice-flow direction and where the accumulation rate and ice-flow ...
Felix Ng, Edward C. King
openalex   +4 more sources

Gravitational Separation in Polar Firn [PDF]

Science, 1993
H.L. Craig
openalex   +4 more sources

Response : Gravitational Separation in Polar Firn [PDF]

Science, 1993
International ...
Dominique Raynaud, J. M. Banola, J. Chappellaz, R. J. Delmas, C. Lorius, J. Jouzel, Jakob Schwander   +6 more
  +6 more sources

Pore morphology of polar firn around closure revealed by X-ray tomography [PDF]

The Cryosphere, 2018
Understanding the slow densification process of polar firn into ice is essential in order to constrain the age difference between the ice matrix and entrapped gases.
A. Burr, A. Burr, C. Ballot, C. Ballot, P. Lhuissier, P. Martinerie, C. L. Martin, A. Philip   +7 more
doaj   +3 more sources

The densification of layered polar firn [PDF]

Journal of Geophysical Research, 2011
Sepp Kipfstuhl, F Wilhelms
exaly   +4 more sources