Hoar crystal development and disappearance at Dome C, Antarctica: observation by near-infrared photography and passive microwave satellite
Hoar crystals episodically cover the snow surface in Antarctica and affect the roughness and reflective properties of the air–snow interface. However, little is known about their evolution and the processes responsible for their development and disappearance despite a probable influence on the surfa...
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Copernicus Publications
2013
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00022045 2023-05-15T13:41:01+02:00 Hoar crystal development and disappearance at Dome C, Antarctica: observation by near-infrared photography and passive microwave satellite Champollion, N. Picard, G. Arnaud, L. Lefebvre, E. Fily, M. 2013-08 electronic https://doi.org/10.5194/tc-7-1247-2013 https://noa.gwlb.de/receive/cop_mods_00022045 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00022000/tc-7-1247-2013.pdf https://tc.copernicus.org/articles/7/1247/2013/tc-7-1247-2013.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-7-1247-2013 https://noa.gwlb.de/receive/cop_mods_00022045 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00022000/tc-7-1247-2013.pdf https://tc.copernicus.org/articles/7/1247/2013/tc-7-1247-2013.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2013 ftnonlinearchiv https://doi.org/10.5194/tc-7-1247-2013 2022-02-08T22:51:20Z Hoar crystals episodically cover the snow surface in Antarctica and affect the roughness and reflective properties of the air–snow interface. However, little is known about their evolution and the processes responsible for their development and disappearance despite a probable influence on the surface mass balance and energy budget. To investigate hoar evolution, we use continuous observations of the surface by in situ near-infrared photography and by passive microwave remote sensing at Dome C in Antarctica. From the photography data, we retrieved a daily indicator of the presence/absence of hoar crystals using a texture analysis algorithm. The analysis of this 2 yr long time series shows that Dome C surface is covered almost half of the time by hoar. The development of hoar crystals takes a few days and seems to occur whatever the meteorological conditions. In contrast, the disappearance of hoar is rapid (a few hours) and coincident with either strong winds or with moderate winds associated with a change in wind direction from southwest (the prevailing direction) to southeast. From the microwave satellite data, we computed the polarisation ratio (i.e. horizontal over vertical polarised brightness temperatures), an indicator known to be sensitive to hoar in Greenland. Photography data and microwave polarisation ratio are correlated, i.e. high values of polarisation ratio which theoretically correspond to low snow density values near the surface are associated with the presence of hoar crystals in the photography data. Satellite data over nearly ten years (2002–2011) confirm that a strong decrease of the polarisation ratio (i.e. signature of hoar disappearance) is associated with an increase of wind speed or a change in wind direction from the prevailing direction. The photography data provides, in addition, evidence of interactions between hoar and snowfall. Further adding the combined influence of wind speed and wind direction results in a complex picture of the snow–atmosphere interactions in Antarctica which deserves further quantification and modelling. Article in Journal/Newspaper Antarc* Antarctica Greenland The Cryosphere Niedersächsisches Online-Archiv NOA Greenland The Cryosphere 7 4 1247 1262 |
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Niedersächsisches Online-Archiv NOA |
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English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Champollion, N. Picard, G. Arnaud, L. Lefebvre, E. Fily, M. Hoar crystal development and disappearance at Dome C, Antarctica: observation by near-infrared photography and passive microwave satellite |
topic_facet |
article Verlagsveröffentlichung |
description |
Hoar crystals episodically cover the snow surface in Antarctica and affect the roughness and reflective properties of the air–snow interface. However, little is known about their evolution and the processes responsible for their development and disappearance despite a probable influence on the surface mass balance and energy budget. To investigate hoar evolution, we use continuous observations of the surface by in situ near-infrared photography and by passive microwave remote sensing at Dome C in Antarctica. From the photography data, we retrieved a daily indicator of the presence/absence of hoar crystals using a texture analysis algorithm. The analysis of this 2 yr long time series shows that Dome C surface is covered almost half of the time by hoar. The development of hoar crystals takes a few days and seems to occur whatever the meteorological conditions. In contrast, the disappearance of hoar is rapid (a few hours) and coincident with either strong winds or with moderate winds associated with a change in wind direction from southwest (the prevailing direction) to southeast. From the microwave satellite data, we computed the polarisation ratio (i.e. horizontal over vertical polarised brightness temperatures), an indicator known to be sensitive to hoar in Greenland. Photography data and microwave polarisation ratio are correlated, i.e. high values of polarisation ratio which theoretically correspond to low snow density values near the surface are associated with the presence of hoar crystals in the photography data. Satellite data over nearly ten years (2002–2011) confirm that a strong decrease of the polarisation ratio (i.e. signature of hoar disappearance) is associated with an increase of wind speed or a change in wind direction from the prevailing direction. The photography data provides, in addition, evidence of interactions between hoar and snowfall. Further adding the combined influence of wind speed and wind direction results in a complex picture of the snow–atmosphere interactions in Antarctica which deserves further quantification and modelling. |
format |
Article in Journal/Newspaper |
author |
Champollion, N. Picard, G. Arnaud, L. Lefebvre, E. Fily, M. |
author_facet |
Champollion, N. Picard, G. Arnaud, L. Lefebvre, E. Fily, M. |
author_sort |
Champollion, N. |
title |
Hoar crystal development and disappearance at Dome C, Antarctica: observation by near-infrared photography and passive microwave satellite |
title_short |
Hoar crystal development and disappearance at Dome C, Antarctica: observation by near-infrared photography and passive microwave satellite |
title_full |
Hoar crystal development and disappearance at Dome C, Antarctica: observation by near-infrared photography and passive microwave satellite |
title_fullStr |
Hoar crystal development and disappearance at Dome C, Antarctica: observation by near-infrared photography and passive microwave satellite |
title_full_unstemmed |
Hoar crystal development and disappearance at Dome C, Antarctica: observation by near-infrared photography and passive microwave satellite |
title_sort |
hoar crystal development and disappearance at dome c, antarctica: observation by near-infrared photography and passive microwave satellite |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/tc-7-1247-2013 https://noa.gwlb.de/receive/cop_mods_00022045 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00022000/tc-7-1247-2013.pdf https://tc.copernicus.org/articles/7/1247/2013/tc-7-1247-2013.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Antarc* Antarctica Greenland The Cryosphere |
genre_facet |
Antarc* Antarctica Greenland The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-7-1247-2013 https://noa.gwlb.de/receive/cop_mods_00022045 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00022000/tc-7-1247-2013.pdf https://tc.copernicus.org/articles/7/1247/2013/tc-7-1247-2013.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-7-1247-2013 |
container_title |
The Cryosphere |
container_volume |
7 |
container_issue |
4 |
container_start_page |
1247 |
op_container_end_page |
1262 |
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1766144710017024000 |