Data

EAGLE/ICECAP II - instrument measurements (laser, magnetics and positioning)

Australian Antarctic Division
Blankenship, D.D., Beem, L.H., Greenbaum, J.S., Roberts, J.L., Young, D.A., Le Meur, E. and Van Ommen, T. ; BLANKENSHIP, DONALD D ; BEEM, LUCAS H. ; GREENBAUM, JAMIN S. ; ROBERTS, JASON LEIGH ; YOUNG, DUNCAN ALEXANDER ; LE MEUR, EMMANUEL ; VAN OMMEN, TAS
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ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=http://data.aad.gov.au/metadata/AAS_4346_EAGLE_ICECAP_Level1B_AEROGEOPHYSICS&rft.title=EAGLE/ICECAP II - instrument measurements (laser, magnetics and positioning)&rft.identifier=http://data.aad.gov.au/metadata/AAS_4346_EAGLE_ICECAP_Level1B_AEROGEOPHYSICS&rft.publisher=Australian Antarctic Data Centre&rft.description=These aerogeophysical data were collected as part of the ICECAP (International Collaborative Exploration of the Cryosphere through Airborne Profiling) collaboration in 2015/16 (ICP7), 2016/17 (ICP8) and 2018/19 (ICP10). These data were in part funded by the US National Science Foundation (grant PLR-1543452 to UTIG), Antarctic Gateway, ACE-CRC the G. Unger Vetlesen Foundation, and supported by the Australian Antarctic Division through project AAS-4346.This data collection represents georeferenced, time registered instrument measurements (L1B data) converted to SI units, and is of most interest to users who wish to reprocess the data. Users interested in geophysical observables should used the derived Level 2 dataset. The data format are space delimited ASCII files, following the formats used for UTIG/AAD/NASA's predecessor ICECAP/OIB project at NASA's NSIDC DAAC. Fields are described in the # delimited detailed header for each granule. POSITIONINGGPS provides the positioning (and timing) for all other data streamsEPUTG1B post processed 50 Hz positions; ASCII; used as source for interpolated position data in all Level 2 data streamsMAGNETICSMagnetics provides constraints on the depth to crystalline rock, and hence indicates the density of bathymetryEMGEO1B georeferenced total magnetic field data; 10 Hz ASCIIALTIMETRYRepeat track laser altimetry provides a history of thinning of outlet glaciersELUTP1B georeferenced laser range data, no orientation corrections; 3.5 Hz ASCIIAn update was made to the dataset on 2023-02-24 to include data from 2018.Progress Code: completedStatement: Positioning data for flights ICP7/F04, ICP7/F18 and part of ICP7/F09 was unavailable as of submission due to data corruption.&rft.creator=Blankenship, D.D., Beem, L.H., Greenbaum, J.S., Roberts, J.L., Young, D.A., Le Meur, E. and Van Ommen, T. &rft.creator=BLANKENSHIP, DONALD D &rft.creator=BEEM, LUCAS H. &rft.creator=GREENBAUM, JAMIN S. &rft.creator=ROBERTS, JASON LEIGH &rft.creator=YOUNG, DUNCAN ALEXANDER &rft.creator=LE MEUR, EMMANUEL &rft.creator=VAN OMMEN, TAS &rft.date=2018&rft.coverage=westlimit=80.15625; southlimit=-70.14036; eastlimit=156; northlimit=-63&rft.coverage=westlimit=80.15625; southlimit=-70.14036; eastlimit=156; northlimit=-63&rft_rights=These data are publicly available for download from the provided URL. These data were previously described by a different DOI - doi:10.26179/5bcfef4e3a297&rft_rights=Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/legalcode&rft_rights=This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4346_EAGLE_ICECAP_Level1B_AEROGEOPHYSICS when using these data.&rft_rights=This metadata record is publicly available.&rft_subject=climatologyMeteorologyAtmosphere&rft_subject=geoscientificInformation&rft_subject=environment&rft_subject=EARTH SCIENCE > CRYOSPHERE > GLACIERS/ICE SHEETS > GLACIER MASS BALANCE/ICE SHEET MASS BALANCE&rft_subject=EARTH SCIENCE > CLIMATE INDICATORS > CRYOSPHERIC INDICATORS > GLACIAL MEASUREMENTS > GLACIER MASS BALANCE/ICE SHEET MASS BALANCE&rft_subject=EARTH SCIENCE > CLIMATE INDICATORS > CRYOSPHERIC INDICATORS > GLACIAL MEASUREMENTS&rft_subject=EARTH SCIENCE > SOLID EARTH > GEOMAGNETISM&rft_subject=EAGLE&rft_subject=ICECAP&rft_subject=Laser_RF > Laser Range Finder&rft_subject=GEOMET 823A > Geometrics 823A Magnetometer&rft_subject=UTIG IMU > University of Texas Inertial Measurement Unit&rft_subject=BT-67 > Basler BT-67&rft_subject=AMD&rft_subject=AMD/AU&rft_subject=CEOS&rft_subject=ACE/CRC&rft_subject=GEOGRAPHIC REGION > POLAR&rft_subject=CONTINENT > ANTARCTICA > COOK ICE SHELF&rft_subject=CONTINENT > ANTARCTICA > DENMAN GLACIER&rft_subject=CONTINENT > ANTARCTICA > GEORGE V COAST&rft_subject=CONTINENT > ANTARCTICA > KNOX COAST&rft_subject=CONTINENT > ANTARCTICA > SABRINA COAST&rft_subject=CONTINENT > ANTARCTICA > SHACKLETON ICE SHELF&rft_subject=CONTINENT > ANTARCTICA > TOTTEN GLACIER&rft_subject=CONTINENT > ANTARCTICA > WILKES LAND&rft_subject=OCEAN > SOUTHERN OCEAN&rft.type=dataset&rft.language=English Access the data
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Attribution 4.0 International (CC BY 4.0)
https://creativecommons.org/licenses/by/4.0/legalcode

These data are publicly available for download from the provided URL.

These data were previously described by a different DOI - doi:10.26179/5bcfef4e3a297

This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/).

Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4346_EAGLE_ICECAP_Level1B_AEROGEOPHYSICS when using these data.

This metadata record is publicly available.

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Full description

These aerogeophysical data were collected as part of the ICECAP (International Collaborative Exploration of the Cryosphere through Airborne Profiling) collaboration in 2015/16 (ICP7), 2016/17 (ICP8) and 2018/19 (ICP10). These data were in part funded by the US National Science Foundation (grant PLR-1543452 to UTIG), Antarctic Gateway, ACE-CRC the G. Unger Vetlesen Foundation, and supported by the Australian Antarctic Division through project AAS-4346.

This data collection represents georeferenced, time registered instrument measurements (L1B data) converted to SI units, and is of most interest to users who wish to reprocess the data. Users interested in geophysical observables should used the derived Level 2 dataset. The data format are space delimited ASCII files, following the formats used for UTIG/AAD/NASA's predecessor ICECAP/OIB project at NASA's NSIDC DAAC. Fields are described in the # delimited detailed header for each granule.

POSITIONING
GPS provides the positioning (and timing) for all other data streams
EPUTG1B post processed 50 Hz positions; ASCII; used as source for interpolated position data in all Level 2 data streams

MAGNETICS
Magnetics provides constraints on the depth to crystalline rock, and hence indicates the density of bathymetry
EMGEO1B georeferenced total magnetic field data; 10 Hz ASCII

ALTIMETRY
Repeat track laser altimetry provides a history of thinning of outlet glaciers
ELUTP1B georeferenced laser range data, no orientation corrections; 3.5 Hz ASCII

An update was made to the dataset on 2023-02-24 to include data from 2018.

Lineage

Progress Code: completed
Statement: Positioning data for flights ICP7/F04, ICP7/F18 and part of ICP7/F09 was unavailable as of submission due to data corruption.

Notes

Purpose
We proposed to integrate aerogeophysical data collected over three critical sections of the East Antarctic grounding zone (Totten Glacier, Denman Glacier, and Cook Ice Shelf). We are motivated by their differences in recent grounding zone altimetry records and their offshore record of Cenozoic retreat. We will assess three hypotheses to isolate the processes that drive the differences in observed grounding zone thinning: 1. Bathymetry and large-scale ocean forcing control cavity circulation; 2. ice shelf draft and basal morphology control cavity circulation; 3. Subglacial freshwater input across the grounding line controls cavity circulation. Due to the presence of large subglacial basins under the ice sheet, the Indo-Pacific sector of the East Antarctic Ice Sheet is susceptible to ice loss through grounding line retreat. Ice shelves help prevent this retreat by exerting a buttressing effect, which is a function of the ice shelves’ thickness. However, recent airborne and satellite results have reported significant basal melting of many East Antarctic ice shelves, which decreases ice shelf thickness. As a result, lower backstress on the interior ice can potentially allow increased discharge of ice across the grounding line. For specifically these reasons, this region has been the target of ongoing United States and foreign scientific airborne and marine expeditions, as well as a major International Ocean Drilling Project effort in 2008. These studies have provided the large-scale context for the interior grounded ice and sparse continental shelf sampling which both indicate that the Indo-Pacific margin of the EAIS has advanced and retreated into the deep interior basins many times. This finding confirms the importance of better understanding of this area and its controls in order to constrain future sea level estimates. The key outcomes of our research will be: 1. An evaluation of land ice and ocean coupling in areas of significant potential sea level contribution; 2. Relating volume changes of grounded and floating ice to regional oceanic heat transport and sub-ice shelf ocean dynamics in areas of significant potential sea level and meridional overturning circulation impacts; 3. Improved boundary conditions to evaluate mass, heat, and freshwater budgets of East Antarctica’s continental margins.

Data time period: 2015-12-30 to 2017-02-15

Data time period: 2019-01-14 to 2019-01-19

This dataset is part of a larger collection

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156,-63 156,-70.14036 80.15625,-70.14036 80.15625,-63 156,-63

118.078125,-66.57018

text: westlimit=80.15625; southlimit=-70.14036; eastlimit=156; northlimit=-63

Subjects
ACE/CRC | AMD | AMD/AU | BT-67 > Basler BT-67 | CEOS | CONTINENT > ANTARCTICA > COOK ICE SHELF | CONTINENT > ANTARCTICA > DENMAN GLACIER | CONTINENT > ANTARCTICA > GEORGE V COAST | CONTINENT > ANTARCTICA > KNOX COAST | CONTINENT > ANTARCTICA > SABRINA COAST | CONTINENT > ANTARCTICA > SHACKLETON ICE SHELF | CONTINENT > ANTARCTICA > TOTTEN GLACIER | CONTINENT > ANTARCTICA > WILKES LAND | EAGLE | EARTH SCIENCE > CLIMATE INDICATORS > CRYOSPHERIC INDICATORS > GLACIAL MEASUREMENTS | EARTH SCIENCE > CLIMATE INDICATORS > CRYOSPHERIC INDICATORS > GLACIAL MEASUREMENTS > GLACIER MASS BALANCE/ICE SHEET MASS BALANCE | EARTH SCIENCE > CRYOSPHERE > GLACIERS/ICE SHEETS > GLACIER MASS BALANCE/ICE SHEET MASS BALANCE | EARTH SCIENCE > SOLID EARTH > GEOMAGNETISM | GEOGRAPHIC REGION > POLAR | GEOMET 823A > Geometrics 823A Magnetometer | ICECAP | Laser_RF > Laser Range Finder | OCEAN > SOUTHERN OCEAN | UTIG IMU > University of Texas Inertial Measurement Unit | climatologyMeteorologyAtmosphere | environment | geoscientificInformation |

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Other Information
Download the dataset (GET DATA > DIRECT DOWNLOAD)

uri : https://data.aad.gov.au/eds/5593/download

Public information for AAS project AAS_4346 (PROJECT HOME PAGE)

uri : https://projects.aad.gov.au/search_projects_results.cfm?project_no=AAS_4346

Public information for AAS project 4346 (PROJECT HOME PAGE)

uri : https://projects.aad.gov.au/report_project_public.cfm?project_no=4346

Citation reference for this metadata record and dataset. (VIEW RELATED INFORMATION)

uri : https://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=AAS_4346_EAGLE_ICECAP_Level1B_AEROGEOPHYSICS

Identifiers
  • global : AAS_4346_EAGLE_ICECAP_Level1B_AEROGEOPHYSICS