A plot-scale study of firn stratigraphy at Lomonosovfonna, Svalbard, using ice cores, borehole video and GPR surveys in 2012–14
Spatial heterogeneity of snow and firn properties on glaciers introduces uncertainty in interpretation of point and profile observations and complicates modelling of meltwater percolation and runoff. Here we present a study of the temporal and spatial dynamics of firn density and stratigraphy at the...
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Uppsala universitet, Luft-, vatten- och landskapslära
2017
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Online Access: | http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-308681 https://doi.org/10.1017/jog.2016.118 |
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ftuppsalauniv:oai:DiVA.org:uu-308681 2023-05-15T16:57:27+02:00 A plot-scale study of firn stratigraphy at Lomonosovfonna, Svalbard, using ice cores, borehole video and GPR surveys in 2012–14 Marchenko, Sergey Pohjola, Veijo A. Pettersson, Rickard van Pelt, Ward J. J. Vega, Carmen P. Machguth, Horst Bøggild, Carl Isaksson, Elisabeth 2017 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-308681 https://doi.org/10.1017/jog.2016.118 eng eng Uppsala universitet, Luft-, vatten- och landskapslära Univ Ctr Svalbard, Dept Geophys, Longyearbyen, Norway. Univ Zurich, Dept Geog, Zurich, Switzerland. Tech Univ Denmark, Ctr Arctic Technol, Copenhagen, Denmark. Norwegian Polar Res Inst, Tromso, Norway. Journal of Glaciology, 0022-1430, 2017, 63:237, s. 67-78 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-308681 doi:10.1017/jog.2016.118 ISI:000394435300006 info:eu-repo/semantics/openAccess borehole video firn core radar stratigraphy Physical Geography Naturgeografi Earth and Related Environmental Sciences Geovetenskap och miljövetenskap Article in journal info:eu-repo/semantics/article text 2017 ftuppsalauniv https://doi.org/10.1017/jog.2016.118 2023-02-23T21:52:11Z Spatial heterogeneity of snow and firn properties on glaciers introduces uncertainty in interpretation of point and profile observations and complicates modelling of meltwater percolation and runoff. Here we present a study of the temporal and spatial dynamics of firn density and stratigraphy at the plot-scale (approximate to 10 m x 10 m x 10 m) repeated annually during 2012-14 at the Lomonosovfonna ice-field, Svalbard. Results from cores, video inspections in boreholes and radar grid surveys are compared. Ice layers 0.1-50 cm thick comprised approximate to 8% of the borehole length. Most of them are 1-3 cm thick and could not be traced between boreholes separated by 3 m. Large lateral variability of firn structure affects representativeness of observations in single holes and calls for repeated studies in multiple points to derive a representative stratigraphy signal. Radar reflections are poorly correlated with ice layers in individual boreholes. However, the match between the high amplitude peaks in the grid-averaged radar signal and horizons of preferential ice layer formation revealed by averaging the video surveys over multiple boreholes is higher. These horizons are interpreted as buried firn layers previously exposed to melt-freeze or wind-driven densification and several of them are consistently recovered throughout three field campaigns. Article in Journal/Newspaper Journal of Glaciology Svalbard Uppsala University: Publications (DiVA) Lomonosovfonna ENVELOPE(17.663,17.663,78.774,78.774) Svalbard Journal of Glaciology 63 237 67 78 |
institution |
Open Polar |
collection |
Uppsala University: Publications (DiVA) |
op_collection_id |
ftuppsalauniv |
language |
English |
topic |
borehole video firn core radar stratigraphy Physical Geography Naturgeografi Earth and Related Environmental Sciences Geovetenskap och miljövetenskap |
spellingShingle |
borehole video firn core radar stratigraphy Physical Geography Naturgeografi Earth and Related Environmental Sciences Geovetenskap och miljövetenskap Marchenko, Sergey Pohjola, Veijo A. Pettersson, Rickard van Pelt, Ward J. J. Vega, Carmen P. Machguth, Horst Bøggild, Carl Isaksson, Elisabeth A plot-scale study of firn stratigraphy at Lomonosovfonna, Svalbard, using ice cores, borehole video and GPR surveys in 2012–14 |
topic_facet |
borehole video firn core radar stratigraphy Physical Geography Naturgeografi Earth and Related Environmental Sciences Geovetenskap och miljövetenskap |
description |
Spatial heterogeneity of snow and firn properties on glaciers introduces uncertainty in interpretation of point and profile observations and complicates modelling of meltwater percolation and runoff. Here we present a study of the temporal and spatial dynamics of firn density and stratigraphy at the plot-scale (approximate to 10 m x 10 m x 10 m) repeated annually during 2012-14 at the Lomonosovfonna ice-field, Svalbard. Results from cores, video inspections in boreholes and radar grid surveys are compared. Ice layers 0.1-50 cm thick comprised approximate to 8% of the borehole length. Most of them are 1-3 cm thick and could not be traced between boreholes separated by 3 m. Large lateral variability of firn structure affects representativeness of observations in single holes and calls for repeated studies in multiple points to derive a representative stratigraphy signal. Radar reflections are poorly correlated with ice layers in individual boreholes. However, the match between the high amplitude peaks in the grid-averaged radar signal and horizons of preferential ice layer formation revealed by averaging the video surveys over multiple boreholes is higher. These horizons are interpreted as buried firn layers previously exposed to melt-freeze or wind-driven densification and several of them are consistently recovered throughout three field campaigns. |
format |
Article in Journal/Newspaper |
author |
Marchenko, Sergey Pohjola, Veijo A. Pettersson, Rickard van Pelt, Ward J. J. Vega, Carmen P. Machguth, Horst Bøggild, Carl Isaksson, Elisabeth |
author_facet |
Marchenko, Sergey Pohjola, Veijo A. Pettersson, Rickard van Pelt, Ward J. J. Vega, Carmen P. Machguth, Horst Bøggild, Carl Isaksson, Elisabeth |
author_sort |
Marchenko, Sergey |
title |
A plot-scale study of firn stratigraphy at Lomonosovfonna, Svalbard, using ice cores, borehole video and GPR surveys in 2012–14 |
title_short |
A plot-scale study of firn stratigraphy at Lomonosovfonna, Svalbard, using ice cores, borehole video and GPR surveys in 2012–14 |
title_full |
A plot-scale study of firn stratigraphy at Lomonosovfonna, Svalbard, using ice cores, borehole video and GPR surveys in 2012–14 |
title_fullStr |
A plot-scale study of firn stratigraphy at Lomonosovfonna, Svalbard, using ice cores, borehole video and GPR surveys in 2012–14 |
title_full_unstemmed |
A plot-scale study of firn stratigraphy at Lomonosovfonna, Svalbard, using ice cores, borehole video and GPR surveys in 2012–14 |
title_sort |
plot-scale study of firn stratigraphy at lomonosovfonna, svalbard, using ice cores, borehole video and gpr surveys in 2012–14 |
publisher |
Uppsala universitet, Luft-, vatten- och landskapslära |
publishDate |
2017 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-308681 https://doi.org/10.1017/jog.2016.118 |
long_lat |
ENVELOPE(17.663,17.663,78.774,78.774) |
geographic |
Lomonosovfonna Svalbard |
geographic_facet |
Lomonosovfonna Svalbard |
genre |
Journal of Glaciology Svalbard |
genre_facet |
Journal of Glaciology Svalbard |
op_relation |
Journal of Glaciology, 0022-1430, 2017, 63:237, s. 67-78 http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-308681 doi:10.1017/jog.2016.118 ISI:000394435300006 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1017/jog.2016.118 |
container_title |
Journal of Glaciology |
container_volume |
63 |
container_issue |
237 |
container_start_page |
67 |
op_container_end_page |
78 |
_version_ |
1766049004798345216 |