Data

Light absorbing impurity profiles in snow on sea-ice collected during SIPEX II

Australian Antarctic Division
Meiners, K., Warren, S.G. and Zatko, M.C. ; MEINERS, KLAUS ; WARREN, STEPHEN G. ; ZATKO, MARIA C
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=info:doi10.4225/15/59b21fbb9f2d8&rft.title=Light absorbing impurity profiles in snow on sea-ice collected during SIPEX II&rft.identifier=10.4225/15/59b21fbb9f2d8&rft.publisher=Australian Antarctic Data Centre&rft.description=Particulate impurities in snow such as dust and soot can absorb sunlight. This is important for snow albedo in the Arctic, but probably not in the Antarctic. Snow was collected in plastic bags through the full depth of the snowpack over first-year sea ice at several locations: one location each on Ice Stations 1, 2, 3, 4, 7, upwind of the ship. The snow was melted and the meltwater filtered. The filters will be analysed for light-absorbing impurities in a laboratory spectrophotometer in Seattle. Samples of size ~1 kg were collected at Ice Station 1. The filters were blank, so at Ice Stations 2 and 3 larger samples of size 2-4 kg were collected. The filters were still blank, so at Ice Stations 4 and 7 larger samples of size ~8 kg were collected; these do show a slight darkening visible by eye. No snow samples were collected at Stations 5 and 6. Local (ship) time is UTC+10; Sun time is UTC+8. Filters are labelled with prefix 'AO' for Antarctic Ocean.This dataset currently contains snow density (except for at one ice station) and volumes of melt water that were filtered. No further analysis has been carried out on these samples at this point, however at a later stage the filters will be analysed for spectral absorption and converted to a mixing ratio of black carbon in the snow.Progress Code: completedStatement: Our sampling techniques got better with each ice station, but at the first few ice stations there was a considerable amount of lint in our snow samples. The lint was likely from our gloves. The lint can be carefully removed from the filters once back in Seattle so our results will not be affected.&rft.creator=Meiners, K., Warren, S.G. and Zatko, M.C. &rft.creator=MEINERS, KLAUS &rft.creator=WARREN, STEPHEN G. &rft.creator=ZATKO, MARIA C &rft.date=2012&rft.coverage=westlimit=113.0; southlimit=-66.0; eastlimit=147.0; northlimit=-42.0&rft.coverage=westlimit=113.0; southlimit=-66.0; eastlimit=147.0; northlimit=-42.0&rft_rights=These data are publicly available for download from the provided URL.&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=SIPEX_II_Impurities when using these data.&rft_rights=This metadata record is publicly available.&rft_subject=environment&rft_subject=oceans&rft_subject=EARTH SCIENCE > CRYOSPHERE > SNOW/ICE > ALBEDO&rft_subject=SIPEX&rft_subject=Impurities&rft_subject=SPECTROPHOTOMETERS&rft_subject=R/V AA > R/V Aurora Australis&rft_subject=AMD&rft_subject=AMD/AU&rft_subject=CEOS&rft_subject=ACE/CRC&rft_subject=OCEAN > SOUTHERN OCEAN&rft_subject=CONTINENT > ANTARCTICA&rft_subject=GEOGRAPHIC REGION > POLAR&rft.type=dataset&rft.language=English Access the data
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Attribution 4.0 International (CC BY 4.0)
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These data are publicly available for download from the provided URL.

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=SIPEX_II_Impurities when using these data.

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Full description

Particulate impurities in snow such as dust and soot can absorb sunlight. This is important for snow albedo in the Arctic, but probably not in the Antarctic. Snow was collected in plastic bags through the full depth of the snowpack over first-year sea ice at several locations: one location each on Ice Stations 1, 2, 3, 4, 7, upwind of the ship. The snow was melted and the meltwater filtered.

The filters will be analysed for light-absorbing impurities in a laboratory spectrophotometer in Seattle. Samples of size ~1 kg were collected at Ice Station 1. The filters were blank, so at Ice Stations 2 and 3 larger samples of size 2-4 kg were collected. The filters were still blank, so at Ice Stations 4 and 7 larger samples of size ~8 kg were collected; these do show a slight darkening visible by eye. No snow samples were collected at Stations 5 and 6.

Local (ship) time is UTC+10; Sun time is UTC+8. Filters are labelled with prefix 'AO' for Antarctic Ocean.

This dataset currently contains snow density (except for at one ice station) and volumes of melt water that were filtered. No further analysis has been carried out on these samples at this point, however at a later stage the filters will be analysed for spectral absorption and converted to a mixing ratio of black carbon in the snow.

Lineage

Progress Code: completed
Statement: Our sampling techniques got better with each ice station, but at the first few ice stations there was a considerable amount of lint in our snow samples. The lint was likely from our gloves. The lint can be carefully removed from the filters once back in Seattle so our results will not be affected.

Data time period: 2012-09-14 to 2012-11-04

This dataset is part of a larger collection

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147,-42 147,-66 113,-66 113,-42 147,-42

130,-54

text: westlimit=113.0; southlimit=-66.0; eastlimit=147.0; northlimit=-42.0

Subjects
ACE/CRC | AMD | AMD/AU | CEOS | CONTINENT > ANTARCTICA | EARTH SCIENCE > CRYOSPHERE > SNOW/ICE > ALBEDO | GEOGRAPHIC REGION > POLAR | Impurities | OCEAN > SOUTHERN OCEAN | R/V AA > R/V Aurora Australis | SIPEX | SPECTROPHOTOMETERS | environment | oceans |

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Other Information
Download point for the data (GET DATA)

url : https://data.aad.gov.au/eds/3442/download

Public information for ASAC project 4073 (PROJECT HOME PAGE)

url : https://projects.aad.gov.au/search_projects_results.cfm?project_no=4073

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

url : http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=SIPEX_II_Impurities

Identifiers
ACN 633 798 857