Data

Albedos for 300-2500nm for thin sea ice covered with frost flowers, nilas, snow, and slush collected during SIPEX II

Australian Antarctic Division
Warren, S.G., Zatko, M.C. and Gallagher, C. ; WARREN, STEPHEN G. ; ZATKO, MARIA C ; GALLAGHER, CHRISTIAN
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:doi10.4225/15/59ffdef5f05cc&rft.title=Albedos for 300-2500nm for thin sea ice covered with frost flowers, nilas, snow, and slush collected during SIPEX II&rft.identifier=10.4225/15/59ffdef5f05cc&rft.publisher=Australian Antarctic Data Centre&rft.description=This dataset contains albedo data for several varieties of sea ice and snow from 300-2500 nm measured during the SIPEX II voyage (2012). An Analytical Spectral Device (ASD) spectrophotometer records the amount of radiation impingent on a cosine collector, which contains a spectralon diffuser plate. The radiation that hits the diffuser plate is scattered equally in all directions (isotropically). A portion of the radiation incident on the plate is scattered in the direction of a fiber optic cable, which is connected to the ASD. The ASD separates the incoming radiation into 3-10 nm wavelength bins, thus creating a radiation spectrum spanning 300-2500 nm. The cosine collector can be oriented both upwards towards the sky and downward towards the snow and/or sea ice to measure the spectral signature of both the downwelling (from the sky) and upwelling (from the snow/ice) radiation. For each site, we record 5 upwelling and 5 downwelling spectral signatures. MATLAB or a similar analysis package is required to open the spectrum files that are created by the ASD. The ASD files are raw files and named in a sequence, starting with 'spectrum.000'.MATLAB or similar scripts can been written to convert the ASD spectrum data to .mat files. The spectra in the processed files are used to calculate the albedos for various snow and ice types when the ratio of upwelling to downwelling radiation is computed. We use two upwelling scans per one downwelling scan to compute the albedo. Also included is some photography of frost flowers and other examples of ice that was observed.Progress Code: completedStatement: In general, it was difficult to obtain albedo data because not all of the ice stations had thin ice types that were easy to access either by boat or by standing at the edge of a lead. At ice station 3 (October 5th), the thin ice that we were standing on cracked and we were only able to get two upwelling and two downwelling spectrums. We did not have any equipment failures.&rft.creator=Warren, S.G., Zatko, M.C. and Gallagher, C. &rft.creator=WARREN, STEPHEN G. &rft.creator=ZATKO, MARIA C &rft.creator=GALLAGHER, CHRISTIAN &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_Albedo when using these data.&rft_rights=This metadata record is publicly available.&rft_subject=environment&rft_subject=oceans&rft_subject=EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC RADIATION > ALBEDO&rft_subject=EARTH SCIENCE > CRYOSPHERE > SNOW/ICE > ALBEDO&rft_subject=sea ice albedo&rft_subject=snow albedo&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_Albedo when using these data.

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This dataset contains albedo data for several varieties of sea ice and snow from 300-2500 nm measured during the SIPEX II voyage (2012). An Analytical Spectral Device (ASD) spectrophotometer records the amount of radiation impingent on a cosine collector, which contains a spectralon diffuser plate. The radiation that hits the diffuser plate is scattered equally in all directions (isotropically). A portion of the radiation incident on the plate is scattered in the direction of a fiber optic cable, which is connected to the ASD. The ASD separates the incoming radiation into 3-10 nm wavelength bins, thus creating a radiation spectrum spanning 300-2500 nm. The cosine collector can be oriented both upwards towards the sky and downward towards the snow and/or sea ice to measure the spectral signature of both the downwelling (from the sky) and upwelling (from the snow/ice) radiation. For each site, we record 5 upwelling and 5 downwelling spectral signatures. MATLAB or a similar analysis package is required to open the spectrum files that are created by the ASD. The ASD files are raw files and named in a sequence, starting with 'spectrum.000'.

MATLAB or similar scripts can been written to convert the ASD spectrum data to .mat files. The spectra in the processed files are used to calculate the albedos for various snow and ice types when the ratio of upwelling to downwelling radiation is computed. We use two upwelling scans per one downwelling scan to compute the albedo.

Also included is some photography of frost flowers and other examples of ice that was observed.

Lineage

Progress Code: completed
Statement: In general, it was difficult to obtain albedo data because not all of the ice stations had thin ice types that were easy to access either by boat or by standing at the edge of a lead. At ice station 3 (October 5th), the thin ice that we were standing on cracked and we were only able to get two upwelling and two downwelling spectrums. We did not have any equipment failures.

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 > ATMOSPHERE > ATMOSPHERIC RADIATION > ALBEDO | EARTH SCIENCE > CRYOSPHERE > SNOW/ICE > ALBEDO | GEOGRAPHIC REGION > POLAR | OCEAN > SOUTHERN OCEAN | R/V AA > R/V Aurora Australis | SPECTROPHOTOMETERS | environment | oceans | sea ice albedo | snow albedo |

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Other Information
Download point for the data (GET DATA)

url : https://data.aad.gov.au/eds/3441/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_Albedo

Identifiers
ACN 633 798 857