Data Sheet 4: Supplement 4 from "Stratigraphic studies in the snow and firn of the Greenland ice sheet" (Thesis)
NOTE: Text or symbols not renderable in plain ASCII are indicated by [.]. Abstract is included in .pdf document. The Greenland ice sheet is treated as a monomineralic rock formation, primarily metamorphic, but with a sedimentary veneer of snow and firn. This sedimentary member is perennial above the...
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ftcaltechdata:oai:data.caltech.edu:esafx-xa379 2023-10-09T21:51:57+02:00 Data Sheet 4: Supplement 4 from "Stratigraphic studies in the snow and firn of the Greenland ice sheet" (Thesis) Benson, Carl S. California Institute of Technology Diaz, Tony 1960 application/pdf https://doi.org/10.22002/D1.724 eng eng CaltechDATA url:http://resolver.caltech.edu/CaltechETD:etd-03232006-104828 doi:10.7907/G7V2-0T57 724 doi:10.22002/D1.724 oai:data.caltech.edu:esafx-xa379 info:eu-repo/semantics/openAccess public-domain Greenland ice sheet diagenesis ablation firn line katabatic winds Sorge's law gps thesis phd info:eu-repo/semantics/other 1960 ftcaltechdata https://doi.org/10.22002/D1.72410.7907/G7V2-0T57 2023-09-10T16:48:35Z NOTE: Text or symbols not renderable in plain ASCII are indicated by [.]. Abstract is included in .pdf document. The Greenland ice sheet is treated as a monomineralic rock formation, primarily metamorphic, but with a sedimentary veneer of snow and firn. This sedimentary member is perennial above the firn line, and the classical methods of stratigraphy and sedimentation can be profitably applied to it. During a 4-year period 146 pit studies and 288 supplementary Rammsonde profiles were made along 1100 miles of over-snow traverse (Fig.1). Temperature, density, ram hardness, and grain size were measured in the strata exposed in each pit. Stratification of snow results from variations in the conditions of deposition and is emphasized by subsequent diagenesis. Summer layers are coarser-grained and have generally lower density and hardness values than winter layers; they may also show evidence of surface melt. The onset of fall is usually identified by an abrupt increase in density and hardness accompanied by a decrease in grain size. This stratigraphic discontinuity is used as the annual reference plane. Strata in the upper 10 to 20 meters compose a succession of annual sequences which are preserved in recognizable form for at least several decades. Correlation of annual layers between pits, spaced 10 to 25 miles apart along the traverse of Figure 1, gives a picture of annual accumulation during the past 5 to 20 years for western Greenland between 69 and 77°N. The control established by these data, together with information from earlier expeditions (primarily those of Koch-Wegener and DeQuervain) and from permanent coastal meteorological stations, have been used to make a map showing the distribution of gross annual accumulation, essentially the equivalent of annual precipitation, for the entire ice sheet (Fig. 30). In general, the accumulation contours follow the north-south trend of the coast lines, with extremes of less than 10 cm H2O in the northeast and more than 90 cm H2O per year in the south; the average for ... Other/Unknown Material Greenland Ice Sheet CaltechDATA (California Institute of Technology Research Data Repository) Greenland |
institution |
Open Polar |
collection |
CaltechDATA (California Institute of Technology Research Data Repository) |
op_collection_id |
ftcaltechdata |
language |
English |
topic |
Greenland ice sheet diagenesis ablation firn line katabatic winds Sorge's law gps thesis phd |
spellingShingle |
Greenland ice sheet diagenesis ablation firn line katabatic winds Sorge's law gps thesis phd Benson, Carl S. Data Sheet 4: Supplement 4 from "Stratigraphic studies in the snow and firn of the Greenland ice sheet" (Thesis) |
topic_facet |
Greenland ice sheet diagenesis ablation firn line katabatic winds Sorge's law gps thesis phd |
description |
NOTE: Text or symbols not renderable in plain ASCII are indicated by [.]. Abstract is included in .pdf document. The Greenland ice sheet is treated as a monomineralic rock formation, primarily metamorphic, but with a sedimentary veneer of snow and firn. This sedimentary member is perennial above the firn line, and the classical methods of stratigraphy and sedimentation can be profitably applied to it. During a 4-year period 146 pit studies and 288 supplementary Rammsonde profiles were made along 1100 miles of over-snow traverse (Fig.1). Temperature, density, ram hardness, and grain size were measured in the strata exposed in each pit. Stratification of snow results from variations in the conditions of deposition and is emphasized by subsequent diagenesis. Summer layers are coarser-grained and have generally lower density and hardness values than winter layers; they may also show evidence of surface melt. The onset of fall is usually identified by an abrupt increase in density and hardness accompanied by a decrease in grain size. This stratigraphic discontinuity is used as the annual reference plane. Strata in the upper 10 to 20 meters compose a succession of annual sequences which are preserved in recognizable form for at least several decades. Correlation of annual layers between pits, spaced 10 to 25 miles apart along the traverse of Figure 1, gives a picture of annual accumulation during the past 5 to 20 years for western Greenland between 69 and 77°N. The control established by these data, together with information from earlier expeditions (primarily those of Koch-Wegener and DeQuervain) and from permanent coastal meteorological stations, have been used to make a map showing the distribution of gross annual accumulation, essentially the equivalent of annual precipitation, for the entire ice sheet (Fig. 30). In general, the accumulation contours follow the north-south trend of the coast lines, with extremes of less than 10 cm H2O in the northeast and more than 90 cm H2O per year in the south; the average for ... |
author2 |
California Institute of Technology Diaz, Tony |
format |
Other/Unknown Material |
author |
Benson, Carl S. |
author_facet |
Benson, Carl S. |
author_sort |
Benson, Carl S. |
title |
Data Sheet 4: Supplement 4 from "Stratigraphic studies in the snow and firn of the Greenland ice sheet" (Thesis) |
title_short |
Data Sheet 4: Supplement 4 from "Stratigraphic studies in the snow and firn of the Greenland ice sheet" (Thesis) |
title_full |
Data Sheet 4: Supplement 4 from "Stratigraphic studies in the snow and firn of the Greenland ice sheet" (Thesis) |
title_fullStr |
Data Sheet 4: Supplement 4 from "Stratigraphic studies in the snow and firn of the Greenland ice sheet" (Thesis) |
title_full_unstemmed |
Data Sheet 4: Supplement 4 from "Stratigraphic studies in the snow and firn of the Greenland ice sheet" (Thesis) |
title_sort |
data sheet 4: supplement 4 from "stratigraphic studies in the snow and firn of the greenland ice sheet" (thesis) |
publisher |
CaltechDATA |
publishDate |
1960 |
url |
https://doi.org/10.22002/D1.724 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_relation |
url:http://resolver.caltech.edu/CaltechETD:etd-03232006-104828 doi:10.7907/G7V2-0T57 724 doi:10.22002/D1.724 oai:data.caltech.edu:esafx-xa379 |
op_rights |
info:eu-repo/semantics/openAccess public-domain |
op_doi |
https://doi.org/10.22002/D1.72410.7907/G7V2-0T57 |
_version_ |
1779315074503016448 |