GEODETIC OBSERVATION AND INTERPRETATION OF ICE FLOW VELOCITIES IN THE SOUTHERN PART OF SUBGLACIAL LAKE VOSTOK

Results of geodetic in-situ observations of ice-flow velocities in the southern part of subglacialLakeVostokare combined with data sets of the ice surface topography, ice thickness, surface accumulation, basal accretion and firn/ice density for interpretations regarding the glaciological setting of...

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Published in:Ice and Snow
Main Authors: A. Richter, D. Fedorov V., S. Popov V., M. Fritsche, V. Lipenkov Ya., A. Ekaykin A., V. Lukin V., A. Matveev Yu., R. Dietrich, А. Рихтер, Д. Федоров В., С. Попов И., М. Фриче, В. Липенков Я., А. Екайкин А., В. Лукин В., Ф. Матвеев Ю., Р. Дитрих
Format: Article in Journal/Newspaper
Language:Russian
Published: IGRAS 2015
Subjects:
accumulation
Antarctica
flow velocity
flux gate
GPS
mass balance
аккумуляция
Антарктида
баланс массы
скорость течения
створ ледяного потока
Lake Vostok
Vostok Station
Annals of Glaciology
Antarc*
The Cryosphere
Online Access:https://ice-snow.igras.ru/jour/article/view/205
https://doi.org/10.15356/2076-6734-2012-4-39-48
id ftjias:oai:oai.ice.elpub.ru:article/205
record_format openpolar
institution Open Polar
collection Ice and Snow (E-Journal)
op_collection_id ftjias
language Russian
topic accumulation
Antarctica
flow velocity
flux gate
GPS
mass balance
аккумуляция
Антарктида
баланс массы
скорость течения
створ ледяного потока
spellingShingle accumulation
Antarctica
flow velocity
flux gate
GPS
mass balance
аккумуляция
Антарктида
баланс массы
скорость течения
створ ледяного потока
A. Richter
D. Fedorov V.
S. Popov V.
M. Fritsche
V. Lipenkov Ya.
A. Ekaykin A.
V. Lukin V.
A. Matveev Yu.
R. Dietrich
А. Рихтер
Д. Федоров В.
С. Попов И.
М. Фриче
В. Липенков Я.
А. Екайкин А.
В. Лукин В.
Ф. Матвеев Ю.
Р. Дитрих
GEODETIC OBSERVATION AND INTERPRETATION OF ICE FLOW VELOCITIES IN THE SOUTHERN PART OF SUBGLACIAL LAKE VOSTOK
topic_facet accumulation
Antarctica
flow velocity
flux gate
GPS
mass balance
аккумуляция
Антарктида
баланс массы
скорость течения
створ ледяного потока
description Results of geodetic in-situ observations of ice-flow velocities in the southern part of subglacialLakeVostokare combined with data sets of the ice surface topography, ice thickness, surface accumulation, basal accretion and firn/ice density for interpretations regarding the glaciological setting of theLakeVostoksystem. Based on the ice-flow velocities and the ice thickness, mean surface accumulation rates are derived applying the flux gate method. These are representative for surface segments extending from the southern part ofLakeVostokto the Ridge B ice divide. They are consistent with the present-day accumulation rate at Vostok station and its variation upstream and thus suggest that the area has been close to steady state. In addition, ice-flow dynamics are investigated along a flow line segment extending from26 kmupstream to12 kmdownstream from Vostok station. The analysis suggests deficiencies in current modelling approaches within the transition zone from floating to grounded ice. Анализ результатов высокоточных геодезических измерений скоростей движения льда в южной части подледникового озера Восток, выполненный с привлечением данных о высоте поверхности и мощности ледника, плотности ледниковой толщи, аккумуляции снега и скорости нарастания озёрного льда на подошву ледника, позволил получить новую информацию о динамике Антарктического ледникового покрова в районе станции Восток. На основе предположения о стационарном состоянии ледника выполнены балансовые расчёты для восьми произвольно ориентированных створов ледяных потоков, проходящих в данном районе в непосредственной близости от глубокой скважины 5Г. Они позволили оценить среднюю аккумуляцию снега на площади сегментов ледникового покрова, простирающихся от южной части оз. Восток до ледораздела В. Полученные значения оказались весьма близки к современной аккумуляции снега в районе станции Восток. Выполнены детальные исследования линии тока льда VFL, проходящей через станцию Восток на участке от 26-го километра вверх по течению льда и от 12-го ...
format Article in Journal/Newspaper
author A. Richter
D. Fedorov V.
S. Popov V.
M. Fritsche
V. Lipenkov Ya.
A. Ekaykin A.
V. Lukin V.
A. Matveev Yu.
R. Dietrich
А. Рихтер
Д. Федоров В.
С. Попов И.
М. Фриче
В. Липенков Я.
А. Екайкин А.
В. Лукин В.
Ф. Матвеев Ю.
Р. Дитрих
author_facet A. Richter
D. Fedorov V.
S. Popov V.
M. Fritsche
V. Lipenkov Ya.
A. Ekaykin A.
V. Lukin V.
A. Matveev Yu.
R. Dietrich
А. Рихтер
Д. Федоров В.
С. Попов И.
М. Фриче
В. Липенков Я.
А. Екайкин А.
В. Лукин В.
Ф. Матвеев Ю.
Р. Дитрих
author_sort A. Richter
title GEODETIC OBSERVATION AND INTERPRETATION OF ICE FLOW VELOCITIES IN THE SOUTHERN PART OF SUBGLACIAL LAKE VOSTOK
title_short GEODETIC OBSERVATION AND INTERPRETATION OF ICE FLOW VELOCITIES IN THE SOUTHERN PART OF SUBGLACIAL LAKE VOSTOK
title_full GEODETIC OBSERVATION AND INTERPRETATION OF ICE FLOW VELOCITIES IN THE SOUTHERN PART OF SUBGLACIAL LAKE VOSTOK
title_fullStr GEODETIC OBSERVATION AND INTERPRETATION OF ICE FLOW VELOCITIES IN THE SOUTHERN PART OF SUBGLACIAL LAKE VOSTOK
title_full_unstemmed GEODETIC OBSERVATION AND INTERPRETATION OF ICE FLOW VELOCITIES IN THE SOUTHERN PART OF SUBGLACIAL LAKE VOSTOK
title_sort geodetic observation and interpretation of ice flow velocities in the southern part of subglacial lake vostok
publisher IGRAS
publishDate 2015
url https://ice-snow.igras.ru/jour/article/view/205
https://doi.org/10.15356/2076-6734-2012-4-39-48
long_lat ENVELOPE(106.000,106.000,-77.500,-77.500)
ENVELOPE(106.837,106.837,-78.464,-78.464)
geographic Lake Vostok
Vostok Station
geographic_facet Lake Vostok
Vostok Station
genre Annals of Glaciology
Antarc*
Antarctica
The Cryosphere
Антарктида
genre_facet Annals of Glaciology
Antarc*
Antarctica
The Cryosphere
Антарктида
op_source Ice and Snow; Том 52, № 4 (2012); 39-48
Лёд и Снег; Том 52, № 4 (2012); 39-48
2412-3765
2076-6734
10.15356/2076-6734-2012-4
op_relation Ekaykin A.A., Lipenkov V.Ya., Petit J.R., Masson-Delmott V. 50-years cycle in the changes of accumulation and isotope composition of snow at the Vostok Station. Materialy Glyatsiologicheskikh Issledovaniy. Data of Glaciological Studies. 2003, 94: 163–173. [In Russian].
Ekaykin A.A., Shibaev Yu.A., Lipenkov V.Ya., Salamatin A.N., Popov S.V. Glacigeophysical investifations of ice flow line passed the subglacial Lake Vostok. Vklad Rossii v Mezhdunarodny polyarnyi god. Polyarnaya kriosfera i vody sushi. Input of Russia in the International Polar Year. Polar Cryosphere and land water. Moscow – St.-Petersburg: Paulsen, 2011: 48–69. [In Russian].
Matveev A.Yu., Fedorov D.V., Grebnev V.P., Lukin V.V., Fritsche M., Richter A., Dietrich R. Highly accurate time series of coordinates received from GNSS observations in Antarctica. I: Geodetic determinations. Geodeziya i kartografiya. Geodesy and Cartography. 2012, 11: 10–20. [In Russian].
Fedorov D.V., Schröder L., Egorov A.V., Knöfel C., Brovkov E.V., Richter A., Lukin V.V., Dietrich R. Determination of the ice sheet surface elevation profiles along the inland in Antarctica by kinematic GPS-observations. Led i Sneg. Ice and Snow. 2012, 4 (120): 49–56. [In Russian].
Popov S.V., Chernoglazov Yu.B. Subglacial Lake Vostok, East Antarctica: coastal line and surrounding water reservoirs. Led i Sneg. Ice and Snow. 2011, 1 (113): 13–24. [In Russian].
Popov S.V., Masolov A.N., Lukin V.V. Subglacial Lake Vostok, East Antarctica: glacier thickness, depth of the lake, subglacial and basic relief. Led i Sneg. Ice and Snow. 2011, 1 (113): 25–35. [In Russian].
Bamber J.L., Gomez Dans J.L., Griggs J.A. A new 1 km digital elevation model of the Antarctic derived from combined satellite radar and laser data. Pt. I: Data and methods. The Cryosphere. 2009, 3 (2):101–111.
Bell R.E., Studinger M., Tikku A.A., Clarke G.K.C., Gutner M.M., Meertens C. Origin and fate of Lake Vostok water frozen to the base of the East Antarctic ice sheet. Nature. 2002, 416: 307–310.
Benveniste J. Towards more efficient use of radar altimeter data. ESA Bulletin. 1993, 76: 64–71.
Cuffey K.M., Paterson W.S.B. The Physics of Glaciers. Butterworth-Heinemann, 2010: 693 P.
Ekaykin A.A., Lipenkov V.Ya., Kuzmina I.N., Petit J.R., Masson-Delmotte V., Johnsen S.J. The changes in isotope composition and accumulation of snow at Vostok station, East Antarctica, over the past 200 years. Annals of Glaciology. 2004, 39: 569–575.
Ekaykin A.A., Lipenkov V.Ya., Shibaev Yu.A. Spatial distribution of the snow accumulation rate along the ice flow lines between Ridge B and Lake Vostok. Ice and Snow. 2012, 4 (120): 122–128.
Ewert H., Popov S. V., Richter A., Schwabe J., Scheinert M., Dietrich R. Precise analysis of ICESat altimetry data and assessment of the hydrostatic equilibrium for subglacial Lake Vostok, East Antarctica. Geophys. Journ. International. 2012. doi:10.1111/j.1365-246X.2012.05649.x
Horwath M., Dietrich R., Baessler M., Nixdorf U., Steinhage D., Fritzsche D., Damm V., Reitmayr G. Nivlisen, an Antarctic ice shelf in Dronning Maud Land: geodetic–glaciological results from a combined analysis of ice thickness, ice surface height and ice-flow observations. Journ. of Glaciology. 2006, 52 (176): 17–30.
Jouzel J., Petit J.R., Souchez R., Barkov N.I., Lipenkov V.Ya., Raynaud D., Stievenard M., Vassiliev N.I., Verbeke V., Vimeux F. More than 200 meters of lake ice above subglacial Lake Vostok, Antarctica. Science. 1999, 286: 2138–2141.
Leonard K., Bell R.E., Studinger M., Tremblay B. Anomalous accumulation rates in the Vostok ice-core resulting from ice flow over Lake Vostok. Geophys. Research Letters. 2004, 31. L24401, doi:10.1029/2004GL021102
Lipenkov V.Ya, Salamatin A.N., Duval P. Bubbly-ice densification in ice sheets: II. Applications. Journ. of Glaciology. 1997, 43 (145): 397–407.
Pattyn F., De Smedt B., Souchez R. Influence of subglacial Lake Vostok on the regional ice dynamics of the Antarctic ice sheet: a model study. Journ. of Glaciology. 2004, 50: 583–589.
Rémy F., Shaeffer P., Legrésy B. Ice flow physical processes derived from ERS-1 high-resolution map of the Antarctica and Greenland ice sheets. Geophys. Joun. International. 1999, 139: 645–656.
Richter A., Popov S.V., Dietrich R., Lukin V.V., Fritsche M., Lipenkov V.Ya., Matveev A.Yu., Wendt J., Yuskevich A.V., Masolov V.N. Observational evidence on the stability of the hydroglaciological regime of subglacial Lake Vostok. Geophys. Research Letters. 2008, 35. L11502, doi:10.1029/2008GL033397.
Richter A., Fedorov D.V., Dvoryanenko A.K., Popov S.V., Dietrich R., Lukin V.V., Matveev A.Yu., Fritsche M., Grebnev V.P., Masolov V.N. Observation of ice-flow vectors on inner-continental traverses in East Antarctica. Ice and Snow. 2010, 1 (109): 30–35.
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Roemer S., Legrésy B., Horwath M., Dietrich R. Refined analysis of radar altimetry data applied to the region of the subglacial Lake Vostok. Antarctica: Remote Sensing of Environment. 2007, 106: 269–284, doi:10.1016/j.rse.2006.02.026
Salamatin A.N., Tsyganova E.A., Popov S.V., Lipenkov V.Ya. Ice flow line modelling and ice core data interpretation: Vostok Station (East Antarctica). Physics of Ice Core Records II. Low temperature science, Supplement issue, 68. Sapporo, Hokkaido University Press, 2009: 167–194.
Schutz B. E., Zwally H. J., Shuman C. A., Hanock D., DiMarzio J. P. Overview of the ICESat Mission. Geophys. Research Letters. 2005, 32. L21S01, doi:10.1029/2005GL024009
Siegert M. J., Popov S., Studinger M. Vostok Subglacial Lake: A Review of Geophysical Data Regarding Its Discovery and Topographic Setting. Antarctic Subglacial Aquatic Environments. AGU Geophysical Monograph Series. 2011, 192: 45–60.
Thoma M., Grosfeld K., Mayer C., Pattyn F. Ice flow sensitivity to boundary processes: A coupled model study in the Subglacial Lake Vostok area. Annals of Glaciology. 2012, 53 (60): 173–180, doi:10.3189/2012AoG60A009
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Wendt J., Dietrich R., Fritsche M., Wendt A., Yuskevich A., Kokhanov A., Senatorov A., Lukin V., Shibuya K., Doi K. Geodetic observations of ice flow velocities over the southern part of subglacial Lake Vostok, Antarctica, and their glaciological implications. Geophys. Journ. International. 2006, 166: 991–998, doi:10.1111/j.1365– 246X.2006.03061
https://ice-snow.igras.ru/jour/article/view/205
doi:10.15356/2076-6734-2012-4-39-48
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op_doi https://doi.org/10.15356/2076-6734-2012-4-39-48
https://doi.org/10.15356/2076-6734-2012-4
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https://doi.org/10.1029/2004GL021102
https://doi.org/10.1029/2008GL033397
https://doi.org/10.1016/j.rse.20
container_title Ice and Snow
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spelling ftjias:oai:oai.ice.elpub.ru:article/205 2023-05-15T13:29:50+02:00 GEODETIC OBSERVATION AND INTERPRETATION OF ICE FLOW VELOCITIES IN THE SOUTHERN PART OF SUBGLACIAL LAKE VOSTOK ГЕОДЕЗИЧЕСКИЕ НАБЛЮДЕНИЯ И ИНТЕРПРЕТАЦИЯ СКОРОСТЕЙ ТЕЧЕНИЯ ЛЬДА В ЮЖНОЙ ЧАСТИ ПОДЛЕДНИКОВОГО ОЗЕРА ВОСТОК A. Richter D. Fedorov V. S. Popov V. M. Fritsche V. Lipenkov Ya. A. Ekaykin A. V. Lukin V. A. Matveev Yu. R. Dietrich А. Рихтер Д. Федоров В. С. Попов И. М. Фриче В. Липенков Я. А. Екайкин А. В. Лукин В. Ф. Матвеев Ю. Р. Дитрих 2015-11-14 https://ice-snow.igras.ru/jour/article/view/205 https://doi.org/10.15356/2076-6734-2012-4-39-48 ru rus IGRAS Ekaykin A.A., Lipenkov V.Ya., Petit J.R., Masson-Delmott V. 50-years cycle in the changes of accumulation and isotope composition of snow at the Vostok Station. Materialy Glyatsiologicheskikh Issledovaniy. Data of Glaciological Studies. 2003, 94: 163–173. [In Russian]. Ekaykin A.A., Shibaev Yu.A., Lipenkov V.Ya., Salamatin A.N., Popov S.V. Glacigeophysical investifations of ice flow line passed the subglacial Lake Vostok. Vklad Rossii v Mezhdunarodny polyarnyi god. Polyarnaya kriosfera i vody sushi. Input of Russia in the International Polar Year. Polar Cryosphere and land water. Moscow – St.-Petersburg: Paulsen, 2011: 48–69. [In Russian]. Matveev A.Yu., Fedorov D.V., Grebnev V.P., Lukin V.V., Fritsche M., Richter A., Dietrich R. Highly accurate time series of coordinates received from GNSS observations in Antarctica. I: Geodetic determinations. Geodeziya i kartografiya. Geodesy and Cartography. 2012, 11: 10–20. [In Russian]. Fedorov D.V., Schröder L., Egorov A.V., Knöfel C., Brovkov E.V., Richter A., Lukin V.V., Dietrich R. Determination of the ice sheet surface elevation profiles along the inland in Antarctica by kinematic GPS-observations. Led i Sneg. Ice and Snow. 2012, 4 (120): 49–56. [In Russian]. Popov S.V., Chernoglazov Yu.B. Subglacial Lake Vostok, East Antarctica: coastal line and surrounding water reservoirs. Led i Sneg. Ice and Snow. 2011, 1 (113): 13–24. [In Russian]. Popov S.V., Masolov A.N., Lukin V.V. Subglacial Lake Vostok, East Antarctica: glacier thickness, depth of the lake, subglacial and basic relief. Led i Sneg. Ice and Snow. 2011, 1 (113): 25–35. [In Russian]. Bamber J.L., Gomez Dans J.L., Griggs J.A. A new 1 km digital elevation model of the Antarctic derived from combined satellite radar and laser data. Pt. I: Data and methods. The Cryosphere. 2009, 3 (2):101–111. Bell R.E., Studinger M., Tikku A.A., Clarke G.K.C., Gutner M.M., Meertens C. Origin and fate of Lake Vostok water frozen to the base of the East Antarctic ice sheet. Nature. 2002, 416: 307–310. Benveniste J. Towards more efficient use of radar altimeter data. ESA Bulletin. 1993, 76: 64–71. Cuffey K.M., Paterson W.S.B. The Physics of Glaciers. Butterworth-Heinemann, 2010: 693 P. Ekaykin A.A., Lipenkov V.Ya., Kuzmina I.N., Petit J.R., Masson-Delmotte V., Johnsen S.J. The changes in isotope composition and accumulation of snow at Vostok station, East Antarctica, over the past 200 years. Annals of Glaciology. 2004, 39: 569–575. Ekaykin A.A., Lipenkov V.Ya., Shibaev Yu.A. Spatial distribution of the snow accumulation rate along the ice flow lines between Ridge B and Lake Vostok. Ice and Snow. 2012, 4 (120): 122–128. Ewert H., Popov S. V., Richter A., Schwabe J., Scheinert M., Dietrich R. Precise analysis of ICESat altimetry data and assessment of the hydrostatic equilibrium for subglacial Lake Vostok, East Antarctica. Geophys. Journ. International. 2012. doi:10.1111/j.1365-246X.2012.05649.x Horwath M., Dietrich R., Baessler M., Nixdorf U., Steinhage D., Fritzsche D., Damm V., Reitmayr G. Nivlisen, an Antarctic ice shelf in Dronning Maud Land: geodetic–glaciological results from a combined analysis of ice thickness, ice surface height and ice-flow observations. Journ. of Glaciology. 2006, 52 (176): 17–30. Jouzel J., Petit J.R., Souchez R., Barkov N.I., Lipenkov V.Ya., Raynaud D., Stievenard M., Vassiliev N.I., Verbeke V., Vimeux F. More than 200 meters of lake ice above subglacial Lake Vostok, Antarctica. Science. 1999, 286: 2138–2141. Leonard K., Bell R.E., Studinger M., Tremblay B. Anomalous accumulation rates in the Vostok ice-core resulting from ice flow over Lake Vostok. Geophys. Research Letters. 2004, 31. L24401, doi:10.1029/2004GL021102 Lipenkov V.Ya, Salamatin A.N., Duval P. Bubbly-ice densification in ice sheets: II. Applications. Journ. of Glaciology. 1997, 43 (145): 397–407. Pattyn F., De Smedt B., Souchez R. Influence of subglacial Lake Vostok on the regional ice dynamics of the Antarctic ice sheet: a model study. Journ. of Glaciology. 2004, 50: 583–589. Rémy F., Shaeffer P., Legrésy B. Ice flow physical processes derived from ERS-1 high-resolution map of the Antarctica and Greenland ice sheets. Geophys. Joun. International. 1999, 139: 645–656. Richter A., Popov S.V., Dietrich R., Lukin V.V., Fritsche M., Lipenkov V.Ya., Matveev A.Yu., Wendt J., Yuskevich A.V., Masolov V.N. Observational evidence on the stability of the hydroglaciological regime of subglacial Lake Vostok. Geophys. Research Letters. 2008, 35. L11502, doi:10.1029/2008GL033397. Richter A., Fedorov D.V., Dvoryanenko A.K., Popov S.V., Dietrich R., Lukin V.V., Matveev A.Yu., Fritsche M., Grebnev V.P., Masolov V.N. Observation of ice-flow vectors on inner-continental traverses in East Antarctica. Ice and Snow. 2010, 1 (109): 30–35. Richter A., Fedorov D.V., Fritsche M., Popov S.V., Lipenkov V.Ya., Ekaykin A.A., Lukin V.V., Matveev A.Yu., Grebnev V.P., Rosenau R., Dietrich R. Ice flow velocities over subglacial Lake Vostok, East Antarctica, determined by 10 years of GNSS observations // Journ. of Glaciology. 2012; in review. Roemer S., Legrésy B., Horwath M., Dietrich R. Refined analysis of radar altimetry data applied to the region of the subglacial Lake Vostok. Antarctica: Remote Sensing of Environment. 2007, 106: 269–284, doi:10.1016/j.rse.2006.02.026 Salamatin A.N., Tsyganova E.A., Popov S.V., Lipenkov V.Ya. Ice flow line modelling and ice core data interpretation: Vostok Station (East Antarctica). Physics of Ice Core Records II. Low temperature science, Supplement issue, 68. Sapporo, Hokkaido University Press, 2009: 167–194. Schutz B. E., Zwally H. J., Shuman C. A., Hanock D., DiMarzio J. P. Overview of the ICESat Mission. Geophys. Research Letters. 2005, 32. L21S01, doi:10.1029/2005GL024009 Siegert M. J., Popov S., Studinger M. Vostok Subglacial Lake: A Review of Geophysical Data Regarding Its Discovery and Topographic Setting. Antarctic Subglacial Aquatic Environments. AGU Geophysical Monograph Series. 2011, 192: 45–60. Thoma M., Grosfeld K., Mayer C., Pattyn F. Ice flow sensitivity to boundary processes: A coupled model study in the Subglacial Lake Vostok area. 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International. 2006, 166: 991–998, doi:10.1111/j.1365– 246X.2006.03061 https://ice-snow.igras.ru/jour/article/view/205 doi:10.15356/2076-6734-2012-4-39-48 Authors who publish with this journal agree to the following terms:Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access). 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CC-BY Ice and Snow; Том 52, № 4 (2012); 39-48 Лёд и Снег; Том 52, № 4 (2012); 39-48 2412-3765 2076-6734 10.15356/2076-6734-2012-4 accumulation Antarctica flow velocity flux gate GPS mass balance аккумуляция Антарктида баланс массы скорость течения створ ледяного потока info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2015 ftjias https://doi.org/10.15356/2076-6734-2012-4-39-48 https://doi.org/10.15356/2076-6734-2012-4 https://doi.org/10.1111/j.1365-246X.2012.05649.x https://doi.org/10.1029/2004GL021102 https://doi.org/10.1029/2008GL033397 https://doi.org/10.1016/j.rse.20 2022-12-20T13:30:01Z Results of geodetic in-situ observations of ice-flow velocities in the southern part of subglacialLakeVostokare combined with data sets of the ice surface topography, ice thickness, surface accumulation, basal accretion and firn/ice density for interpretations regarding the glaciological setting of theLakeVostoksystem. Based on the ice-flow velocities and the ice thickness, mean surface accumulation rates are derived applying the flux gate method. These are representative for surface segments extending from the southern part ofLakeVostokto the Ridge B ice divide. They are consistent with the present-day accumulation rate at Vostok station and its variation upstream and thus suggest that the area has been close to steady state. In addition, ice-flow dynamics are investigated along a flow line segment extending from26 kmupstream to12 kmdownstream from Vostok station. The analysis suggests deficiencies in current modelling approaches within the transition zone from floating to grounded ice. Анализ результатов высокоточных геодезических измерений скоростей движения льда в южной части подледникового озера Восток, выполненный с привлечением данных о высоте поверхности и мощности ледника, плотности ледниковой толщи, аккумуляции снега и скорости нарастания озёрного льда на подошву ледника, позволил получить новую информацию о динамике Антарктического ледникового покрова в районе станции Восток. На основе предположения о стационарном состоянии ледника выполнены балансовые расчёты для восьми произвольно ориентированных створов ледяных потоков, проходящих в данном районе в непосредственной близости от глубокой скважины 5Г. Они позволили оценить среднюю аккумуляцию снега на площади сегментов ледникового покрова, простирающихся от южной части оз. Восток до ледораздела В. Полученные значения оказались весьма близки к современной аккумуляции снега в районе станции Восток. Выполнены детальные исследования линии тока льда VFL, проходящей через станцию Восток на участке от 26-го километра вверх по течению льда и от 12-го ... Article in Journal/Newspaper Annals of Glaciology Antarc* Antarctica The Cryosphere Антарктида Ice and Snow (E-Journal) Lake Vostok ENVELOPE(106.000,106.000,-77.500,-77.500) Vostok Station ENVELOPE(106.837,106.837,-78.464,-78.464) Ice and Snow 52 4 39

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