NOAA/WDS Paleoclimatology - Arctic Northwest Atlantic 646 Year Coralline Algae Sea Ice Record
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title: NOAA/WDS Paleoclimatology - Arctic Northwest Atlantic 646 Year Coralline Algae Sea Ice Record
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date: 2013-11-18
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Anchor: DOI doi:10.25921/n619-bd42
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abstract: This archived Paleoclimatology Study is available from the NOAA National Centers for Environmental Information (NCEI), under the World Data Service (WDS) for Paleoclimatology. The associated NCEI study type is Paleoceanography. The data include parameters of corals and sclerosponges with a geographic location of North Atlantic Ocean. The time period coverage is from 585 to -60 in calendar years before present (BP). See metadata information for parameter and study location details. Please cite this study when using the data.
purpose: Records of past climate and ocean circulation derived from marine sediments. Parameter keywords describe what was measured in this dataset. Additional summary information can be found in the abstracts of papers listed in the dataset citations.
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keyword: Earth Science > Paleoclimate > Ocean/Lake Records
keyword: Earth Science > Climate Indicators > Paleoclimate Indicators > Ocean/Lake Records
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date: 2020-01-09
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keyword: earth science > paleoclimate > corals and sclerosponges
keyword: earth science > paleoclimate > corals and sclerosponges
keyword: earth science > paleoclimate > paleocean > reconstruction
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keyword: Arctic
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keyword: What: age; Material: null
keyword: What: proxy composite; Material: Clathromorphum compactum
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keyword: Ocean > Atlantic Ocean > North Atlantic Ocean > Arctic Northwest Atlantic > LATITUDE > LONGITUDE
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keyword: DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
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otherConstraints: Cite as: Halfar, J.; Adey, W.; Kronz, A.; Hetzinger, S.; Edinger, E.; Fitzhugh, W.W. (2013-11-18): NOAA/WDS Paleoclimatology - Arctic Northwest Atlantic 646 Year Coralline Algae Sea Ice Record. [indicate subset used]. NOAA National Centers for Environmental Information. https://doi.org/10.25921/n619-bd42. Accessed [date].
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otherConstraints: Distribution liability: NOAA and NCEI make no warranty, expressed or implied, regarding these data, nor does the fact of distribution constitute such a warranty. NOAA and NCEI cannot assume liability for any damages caused by any errors or omissions in these data. If appropriate, NCEI can only certify that the data it distributes are an authentic copy of the records that were accepted for inclusion in the NCEI archives.
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otherConstraints: Use liability: NOAA and NCEI cannot provide any warranty as to the accuracy, reliability, or completeness of furnished data. Users assume responsibility to determine the usability of these data. The user is responsible for the results of any application of this data for other than its intended purpose.
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otherConstraints: Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site.
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title: Arctic sea-ice decline archived by multicentury annual-resolution record from crustose coralline algal proxy
date: (CI_Date)
date: 2013
dateType: (CI_DateTypeCode) publication
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individualName: Jochen Halfar, Walter H. Adey, Andreas Kronz, Steffen Hetzinger, Evan Edinger, and William W. Fitzhugh
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description: Jochen Halfar, Walter H. Adey, Andreas Kronz, Steffen Hetzinger, Evan Edinger, and William W. Fitzhugh, 2013: Arctic sea-ice decline archived by multicentury annual-resolution record from crustose coralline algal proxy. Proceedings of the National Academy of Sciences, , , 10.1073/pnas.1313775110
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description: Date Range: 1365 CE to 2010 CE; Date Range: 585 cal yr BP to -60 cal yr BP;
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westBoundLongitude: -85.1536
eastBoundLongitude: -59.8467
southBoundLatitude: 55.3983
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beginPosition: 1365
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supplementalInformation: STUDY NOTES: Samples of Clathromorphum compactum were live collected at Arctic Bay, Nunavut, Canada (73.0174°N; 85.1536°W, Sample AB1, 17m depth, lifespan 1779-2009) and off Kingitok Island, Labrador, Canada (55.3983°N; 59.8467°W, Sample Ki1, 17m depth, lifespan 1851-2011; Sample Ki2, 15m depth, lifespan 1365-2011). Mg/Ca ratios were measured along transects extending over the entire lifespan of each specimen using a JEOL JXA 8900 RL electron microprobe at the University of Göttingen, Germany. Samples were obtained along transect lines oriented perpendicular to the plane of calcite accretion. At each interval the specific subsample location was selected manually by moving the stage no more than 20 µm laterally from the transect line to avoid unsuitable sample locations (i.e., conceptacles= reproductive structures and uncalcified cell interiors). The relative mean standard deviations of multiple standard measurements were found to be no larger than 1.0 % for MgO and 1.2 % for CaO (2-sigma). Counting statistics errors vary between 1.0 relative % and 2.9 relative % for MgO and between 0.40 relative % and 0.62 relative % for CaO (2-sigma). Algal growth-increment widths were calculated from widths of annual Mg/Ca cycles. Reconstructions were standardized to have a mean of zero and unit variance. A combined algal record was calculated by averaging the normalized annual growth rates and annually-averaged Mg/Ca ratios from all three samples. ABSTRACT SUPPLIED BY ORIGINATOR: Northern Hemisphere sea ice has been declining sharply over the past decades and 2012 exhibited the lowest Arctic summer sea-ice cover in historic times. Whereas ongoing changes are closely monitored through satellite observations, we have only limited data of past Arctic sea-ice cover derived from short historical records, indirect terrestrial proxies, and low-resolution marine sediment cores. A multicentury time series from extremely long-lived annual increment-forming crustose coralline algal buildups now provides the first high-resolution in situ marine proxy for sea-ice cover. Growth and Mg/Ca ratios of these Arctic-wide occurring calcified algae are sensitive to changes in both temperature and solar radiation. Growth sharply declines with increasing sea-ice blockage of light from the benthic algal habitat. The 646-y multisite record from the Canadian Arctic indicates that during the Little Ice Age, sea ice was extensive but highly variable on subdecadal time scales and coincided with an expansion of ice-dependent Thule/Labrador Inuit sea mammal hunters in the region. The past 150 y instead have been characterized by sea ice exhibiting multidecadal variability with a long-term decline distinctly steeper than at any time since the 14th century.
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fees: In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media.
orderingInstructions: Contact NCEI for other distribution options and instructions.
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maintenanceNote: This ISO metadata record was translated from DIF metadata using dif-9x-to-iso-19115-2.xsl Version: 2022-06-21
