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Global Change Master Directory (GCMD)
Study of the glacial system of Livingston Island. Terrestrial photogrammetry on the glacial system of Livingston Island.
Entry ID: CNDA-ESP_ANT93-0852ANT94-1326E


Summary
Abstract: In English:

The aim of this project is to understand the dynamics of the glacial system of
Livingston Island (South Shetland Islands, Antarctica). Source data are
obtained both from remote sensing techniques and field work. Remote sensing
data: Geometrical correction and comparison of a set of satellite images and
air photographs show that there has been a 4% diminution in the area of the
Livingston Island ice cap from 1956 to 1991. To understand the dynamics of such
a fast retreat of the ice front, field work studies on mass balance and ice
flow dynamics are needed. Field work: During the 1994/1995 field-work season,
we mainly worked on the portion of the glacial system that calves at Johnson
Dock to get first estimates about mass balance and ice flow.Ice flow dynamics:
17 stakes have been planted to be used as markers. Measurement of the position
of the stakes by using a theodolite indicated that, during the period of
observations (2 months), the downward movement ranged up to 5 m. in the
frontal parts of the glacier whereas ice movement close to the glacial divide
was below measurements errors. Mass balance: Some permanent stakes have been
installed to measure ablation and accumulation rates through the following
years. We recovered 11 continuous ice-cores (to a maximum depth of 16.22 m.) to
be analysed for artificial radioactive elements by M. Pourchet (Laboratoire de
Glaciologie et Geophysique de l'Environment). The aim of these techniques is to
determine the depth at which the ice-layers formed synchronously to the atomic
test of the 1950 and 1960 decades. Samples of ash layers interstratified in ice
have been collected to be analysed geochemically, with the purpose of
correlating them with the well dated recent volcanic eruptions in the nearby
Deception Island. A detailed stratigraphy of the ash layers cropping out at the
coastal ice-front of Livingston Island is currently being made by using
stereoscopic photographs and theodolite measurements. To achieve the aims of
this project, it is extremely important to repeat observations and measurements
during the next years. The reliability of the results to be obtained strongly
depends on getting data through a sufficiently long span of time.

En Espanol:

El objetivo de este proyecto es entender la dinamica del sistema glaciar de la
Isla Livingston (Islas Shetland del Sur, Antartida). Se obtuvieron fuentes de
datos con tecnicas de sensores remotos y trabajo de campo. Datos de sensores
remotos: la correccion geometrica y comparacion de series de imagenes digitales
y fotografias aereas muestran que ha habido un 4% de disminucion en la cubierta
de hielo de la Isla Livingston entre 1956 y 1991. Para entender la dinamica de
esta rapida regresion del frente de hielo, estudios de campo de balance de
masas y dinamica de flujo del hielo son necesarios. Trabajo de campo: Durante
el trabajo de campo de la temporada 1994/1995 trabajamos principalmente en la
porcion del sistema glaciar que parte de Johnson Dock a las primeras
estimaciones del balance de masas y flujo de hielo. Dinamica del flujo de
hielo: se plantaron 17 estacas para ser usadas como marcadores. Las medidas de
la posicion de las estacas se hicieron con un teodolito que ind icaron que,
durante el periodo de observaciones (2 meses) el movimiento descendente se
alineo a 5 m. en las partes frontales del glaciar mientras que el movimiento
del hielo cerca del glaciar era por debajo de las medidas de los errores.
Balance de masas: se instalaron algunas estacas permanentes para medir la
ablacion y tasa de acumulacion en los siguientes anos. Recuperamos 11 centros
de hielo (a una profundidad maxima de 16.22 m) para ser analizados por
elementos radiactivos artificiales por M. Pourchet (Laboratoire de Glaciologie
et Geophysique de l'Environment). El objetivo de esta tecnica es determinar la
profundidad a la cual las capas de hielo se formaron sincronicamente con la
prueba atomica de la decada de 1950 y 1960. Muestras de capas de cenizas
interestratificadas en el hielo han sido recogidas para ser analizadas
geoquimicamente, con el proposito de correlacionarlas con las erupciones
volcanicas correctamente datadas recientemente cerca de la isla Decepcion. Una
detallada estratigrafia de las capas de ceniza aflorando en el frente de hielo
de la costa de la Isla Livingston esta siendo actualmente hecha usando
fotografias estereoscopicas y medidas de teodolitos. Para llevar a cabo los
objetivos de este proyecto es extremadamente importante repetir las
observaciones y medidas durante los proximos anos. La fiabilidad de los
resultados obtenidos depende fuertemente de que la obtencion de datos se haga a
lo largo de un espacio de tiempo suficientemente largo.

Geographic Coverage
 N: -62.0 S: -63.0  E: -60.0  W: -62.0

Data Set Citation
Version: Not provided


Temporal Coverage
Start Date: 1994-12-15
Stop Date: 1995-02-15


Location Keywords
CONTINENT > ANTARCTICA > LIVINGSTON ISLAND
GEOGRAPHIC REGION > POLAR


Science Keywords
CRYOSPHERE >GLACIERS/ICE SHEETS >GLACIERS    [Definition]
CRYOSPHERE >SNOW/ICE >ICE DEPTH/THICKNESS    [Definition]
CRYOSPHERE >SNOW/ICE >ICE GROWTH/MELT    [Definition]
CRYOSPHERE >SNOW/ICE >ICE MOTION    [Definition]
CRYOSPHERE >SNOW/ICE >ICE VELOCITY    [Definition]
PALEOCLIMATE >ICE CORE RECORDS >VOLCANIC DEPOSITS    [Definition]
CRYOSPHERE >GLACIERS/ICE SHEETS >ABLATION ZONES/ACCUMULATION ZONES    [Definition]


Platform
ERS-1 >European Remote Sensing Satellite-1    [Information]
LANDSAT    [Information]
SPOT-1 >Systeme Probatoire Pour l'Observation de la Terre-1    [Information]
STEREOGRAPHIC PHOTOGRAPHS    [Information]


Instrument
THEODOLITE    [Information]
MSS >Multispectral Scanner    [Information]


Keywords
GLACIOLOGY
REMOTE SENSING
PHOTOGRAMMETRY


Data Center
Departamento Geodinimica y Geofisica, Facultat de Geologia, Universidad de Barcelona    [Information]
Data Center URL: http://www.ub.es/geodgf/

Data Center Personnel
Name: JAUME CALVET
Phone: +3493402137
Fax: +34934021340
Email: calvetj at natura.geo.ub.es
Contact Address:
Dpto. Geodinamica y Geofisica
Facultad de Geologia
Universidad de Barcelona
c/ Marti Franquest s/n
City: Barcelona
Postal Code: 08028
Country: Spain



Distribution
Distribution_Media: CD-ROM;DATA
Distribution_Format: ASCII;BINARY


Personnel
ANTONIO BARRAGAN SANABRIA
Role: METADATA AUTHOR
Phone: +34913495731
Fax: +34913495929
Email: a.barragan at igme.es
Contact Address:
Centro Nacional de Datos Antarticos
Instituto Geologico y Minero de Espana
c/Rios Rosas 23
City: Madrid
Postal Code: 28003
Country: SPAIN


JAUME CALVET
Role: TECHNICAL CONTACT
Role: INVESTIGATOR
Phone: +3493402137
Fax: +34934021340
Email: calvetj at natura.geo.ub.es
Contact Address:
Dpto. Geodinamica y Geofisica
Facultad de Geologia
Universidad de Barcelona
c/ Marti Franquest s/n
City: Barcelona
Postal Code: 08028
Country: Spain


Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2003-04-21
Last DIF Revision Date: 2018-10-17



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