Layering of surface snow and firn at Kohnen Station, Antarctica - noise or seasonal signal?
The density of firn is an important property for monitoring and modeling the ice sheet as well as to model the pore close-off and thus to interpret ice core-based greenhouse gas records. One feature, which is still in debate, is the potential existence of an annual cycle of firn density in low-accum...
Published in: | Journal of Geophysical Research: Earth Surface |
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Online Access: | https://epic.awi.de/id/eprint/41912/ https://epic.awi.de/id/eprint/41912/1/Laepple_et_al-2016-Journal_of_Geophysical_Research__Earth_Surface.pdf https://doi.org/10.1002/2016JF003919 https://hdl.handle.net/10013/epic.48734 https://hdl.handle.net/10013/epic.48734.d001 |
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ftawi:oai:epic.awi.de:41912 2023-05-15T13:40:27+02:00 Layering of surface snow and firn at Kohnen Station, Antarctica - noise or seasonal signal? Laepple, Thomas Hörhold, Maria Münch, Thomas Freitag, Johannes Wegner, Anna Kipfstuhl, Sepp 2016 application/pdf https://epic.awi.de/id/eprint/41912/ https://epic.awi.de/id/eprint/41912/1/Laepple_et_al-2016-Journal_of_Geophysical_Research__Earth_Surface.pdf https://doi.org/10.1002/2016JF003919 https://hdl.handle.net/10013/epic.48734 https://hdl.handle.net/10013/epic.48734.d001 unknown Wiley https://epic.awi.de/id/eprint/41912/1/Laepple_et_al-2016-Journal_of_Geophysical_Research__Earth_Surface.pdf https://hdl.handle.net/10013/epic.48734.d001 Laepple, T. orcid:0000-0001-8108-7520 , Hörhold, M. , Münch, T. orcid:0000-0002-5492-7544 , Freitag, J. orcid:0000-0003-2654-9440 , Wegner, A. and Kipfstuhl, S. (2016) Layering of surface snow and firn at Kohnen Station, Antarctica - noise or seasonal signal? , Journal of Geophysical Research: Earth Surface, 121 , pp. 1849-1860 . doi:10.1002/2016JF003919 <https://doi.org/10.1002/2016JF003919> , hdl:10013/epic.48734 EPIC3Journal of Geophysical Research: Earth Surface, Wiley, 121, pp. 1849-1860, ISSN: 21699003 Article isiRev 2016 ftawi https://doi.org/10.1002/2016JF003919 2021-12-24T15:41:57Z The density of firn is an important property for monitoring and modeling the ice sheet as well as to model the pore close-off and thus to interpret ice core-based greenhouse gas records. One feature, which is still in debate, is the potential existence of an annual cycle of firn density in low-accumulation regions. Several studies describe or assume seasonally successive density layers, horizontally evenly distributed, as seen in radar data. On the other hand, high-resolution density measurements on firn cores in Antarctica and Greenland showed no clear seasonal cycle in the top few meters. A major caveat of most existing snow-pit and firn-core based studies is that they represent one vertical profile from a laterally heterogeneous density field. To overcome this, we created an extensive dataset of horizontal and vertical density data at Kohnen Station, Dronning Maud Land on the East Antarctic Plateau. We drilled and analyzed three 90 m long firn cores as well as 160 one meter long vertical profiles from two elongated snow trenches to obtain a two dimensional view of the density variations. The analysis of the 45 m wide and 1 m deep density fields reveals a seasonal cycle in density. However, the seasonality is overprinted by strong stratigraphic noise, making it invisible when analyzing single firn cores. Our density dataset extends the view from the local ice-core perspective to a hundred meter scale and thus supports linking spatially integrating methods such as radar and seismic studies to ice and firn cores. Article in Journal/Newspaper Antarc* Antarctic Antarctica Dronning Maud Land Greenland ice core Ice Sheet Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Dronning Maud Land Greenland Kohnen ENVELOPE(0.000,0.000,-75.000,-75.000) Kohnen Station ENVELOPE(0.000,0.000,-75.000,-75.000) Journal of Geophysical Research: Earth Surface 121 10 1849 1860 |
institution |
Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
The density of firn is an important property for monitoring and modeling the ice sheet as well as to model the pore close-off and thus to interpret ice core-based greenhouse gas records. One feature, which is still in debate, is the potential existence of an annual cycle of firn density in low-accumulation regions. Several studies describe or assume seasonally successive density layers, horizontally evenly distributed, as seen in radar data. On the other hand, high-resolution density measurements on firn cores in Antarctica and Greenland showed no clear seasonal cycle in the top few meters. A major caveat of most existing snow-pit and firn-core based studies is that they represent one vertical profile from a laterally heterogeneous density field. To overcome this, we created an extensive dataset of horizontal and vertical density data at Kohnen Station, Dronning Maud Land on the East Antarctic Plateau. We drilled and analyzed three 90 m long firn cores as well as 160 one meter long vertical profiles from two elongated snow trenches to obtain a two dimensional view of the density variations. The analysis of the 45 m wide and 1 m deep density fields reveals a seasonal cycle in density. However, the seasonality is overprinted by strong stratigraphic noise, making it invisible when analyzing single firn cores. Our density dataset extends the view from the local ice-core perspective to a hundred meter scale and thus supports linking spatially integrating methods such as radar and seismic studies to ice and firn cores. |
format |
Article in Journal/Newspaper |
author |
Laepple, Thomas Hörhold, Maria Münch, Thomas Freitag, Johannes Wegner, Anna Kipfstuhl, Sepp |
spellingShingle |
Laepple, Thomas Hörhold, Maria Münch, Thomas Freitag, Johannes Wegner, Anna Kipfstuhl, Sepp Layering of surface snow and firn at Kohnen Station, Antarctica - noise or seasonal signal? |
author_facet |
Laepple, Thomas Hörhold, Maria Münch, Thomas Freitag, Johannes Wegner, Anna Kipfstuhl, Sepp |
author_sort |
Laepple, Thomas |
title |
Layering of surface snow and firn at Kohnen Station, Antarctica - noise or seasonal signal? |
title_short |
Layering of surface snow and firn at Kohnen Station, Antarctica - noise or seasonal signal? |
title_full |
Layering of surface snow and firn at Kohnen Station, Antarctica - noise or seasonal signal? |
title_fullStr |
Layering of surface snow and firn at Kohnen Station, Antarctica - noise or seasonal signal? |
title_full_unstemmed |
Layering of surface snow and firn at Kohnen Station, Antarctica - noise or seasonal signal? |
title_sort |
layering of surface snow and firn at kohnen station, antarctica - noise or seasonal signal? |
publisher |
Wiley |
publishDate |
2016 |
url |
https://epic.awi.de/id/eprint/41912/ https://epic.awi.de/id/eprint/41912/1/Laepple_et_al-2016-Journal_of_Geophysical_Research__Earth_Surface.pdf https://doi.org/10.1002/2016JF003919 https://hdl.handle.net/10013/epic.48734 https://hdl.handle.net/10013/epic.48734.d001 |
long_lat |
ENVELOPE(0.000,0.000,-75.000,-75.000) ENVELOPE(0.000,0.000,-75.000,-75.000) |
geographic |
Antarctic Dronning Maud Land Greenland Kohnen Kohnen Station |
geographic_facet |
Antarctic Dronning Maud Land Greenland Kohnen Kohnen Station |
genre |
Antarc* Antarctic Antarctica Dronning Maud Land Greenland ice core Ice Sheet |
genre_facet |
Antarc* Antarctic Antarctica Dronning Maud Land Greenland ice core Ice Sheet |
op_source |
EPIC3Journal of Geophysical Research: Earth Surface, Wiley, 121, pp. 1849-1860, ISSN: 21699003 |
op_relation |
https://epic.awi.de/id/eprint/41912/1/Laepple_et_al-2016-Journal_of_Geophysical_Research__Earth_Surface.pdf https://hdl.handle.net/10013/epic.48734.d001 Laepple, T. orcid:0000-0001-8108-7520 , Hörhold, M. , Münch, T. orcid:0000-0002-5492-7544 , Freitag, J. orcid:0000-0003-2654-9440 , Wegner, A. and Kipfstuhl, S. (2016) Layering of surface snow and firn at Kohnen Station, Antarctica - noise or seasonal signal? , Journal of Geophysical Research: Earth Surface, 121 , pp. 1849-1860 . doi:10.1002/2016JF003919 <https://doi.org/10.1002/2016JF003919> , hdl:10013/epic.48734 |
op_doi |
https://doi.org/10.1002/2016JF003919 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
121 |
container_issue |
10 |
container_start_page |
1849 |
op_container_end_page |
1860 |
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1766135230267129856 |