{"NOAAStudyId":"12357","contactInfo":{"address":"325 Broadway, E/NE31","city":"Boulder","constraints":"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.","country":"USA","dataCenterUrl":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data","email":"paleo@noaa.gov","fax":"303-497-6513","longName":"National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce ","phone":"303-497-6280","postalCode":"80305-3328","shortName":"DOC/NOAA/NESDIS/NCEI","state":"CO","type":"CONTACT INFORMATION"},"contributionDate":"2011-12-28","dataPublisher":"NOAA","dataType":"PALEOCEANOGRAPHY","dataTypeInformation":"https://www.ncdc.noaa.gov/data-access/paleoclimatology-data/datasets/paleoceanography","difMetadataLink":"http://www1.ncdc.noaa.gov/pub/data/metadata/published/paleo/dif/xml/noaa-ocean-12357.xml","doi":null,"earliestYearBP":12000,"earliestYearCE":-10050,"entryId":"noaa-ocean-12357","funding":[{"fundingAgency":"US National Science Foundation","fundingGrant":"ATM-0502515"}],"investigators":"Andrews, J.T.","mostRecentYearBP":0,"mostRecentYearCE":1950,"onlineResourceLink":"https://www.ncdc.noaa.gov/paleo/study/12357","originalSource":null,"publication":[{"abstract":"Quantitative X-ray diffraction analysis of the < 2mm sediment \r\nfraction was carried out on 1257 samples (from the seafloor \r\nand 16 cores) from the Iceland shelf west of 18°W.  All but one \r\ncore (B997-347PC) were from transects along troughs on the NW \r\nto N-central shelf, an area that in modern and historic times \r\nhas been affected by drift ice.  The paper focuses on the \r\nnon-clay mineralogy of the sediments (excluding calcite \r\nand volcanic glass).  Quartz and potassium feldspars occupy \r\nsimilar positions in an R-mode Principal Component analysis, \r\nand oligoclase feldspar tracks quartz; these minerals are used \r\nas a proxy for ice-rafted detritus (IRD).  Accordingly the sum \r\nof these largely foreign minerals (Q&K) (to Icelandic bedrock) \r\nis used as a proxy for drift ice.  A stacked, equi-spaced 100-yr \r\nrecord is developed which shows both low frequency trends \r\nand higher frequency events.  The detrended stacked record \r\ncompares well with the flux of quartz (mg/cm2/yr) at MD99-2269 \r\noff N Iceland. The multi taper method (MTM) indicated that \r\nthere are three significant frequencies at the 95% confidence \r\nlevel with periods of ~2500, 445, and 304 yr.  Regime shift \r\nanalysis pinpoints intervals when there was a statistically \r\nsignificant shifts in the average Q&K weight%, and identifies \r\nfour IRD-rich events separated by intervals with lower inputs.  \r\nThere is some association between peaks of IRD input, less dense \r\nsurface waters (from 18O data on planktonic foraminifera), \r\nand intervals of moraine building. \r\n","author":null,"citation":"Andrews, J.T.  2009. \r\nSeeking a Holocene drift ice proxy: non-clay mineral variations \r\nfrom the SW to N-central Iceland shelf: trends, regime shifts, \r\nand periodicities. \r\nJournal of Quaternary Science, Vol. 24, Issue 7, pp. 664-676, \r\nOctober 2009.  DOI: 10.1002/jqs.1257 \r\n","edition":null,"identifier":{"id":"10.1002/jqs.1257","type":"doi","url":"http://dx.doi.org/10.1002/jqs.1257"},"issue":null,"journal":"Journal of Quaternary Science","pages":null,"pubRank":"1","pubYear":2009,"reportNumber":null,"title":"Seeking a Holocene drift ice proxy: non-clay mineral variations  from the SW to N-central Iceland shelf: trends, regime shifts,  and periodicities","type":"publication","volume":null}],"reconstruction":"N","scienceKeywords":["sea ice"],"site":[{"NOAASiteId":"19302","geo":{"geoType":"Feature","geometry":{"coordinates":["66.63","-23.85"],"type":"POINT"},"properties":{"easternmostLongitude":"-23.85","maxElevationMeters":"-365","minElevationMeters":"-365","northernmostLatitude":"66.63","southernmostLatitude":"66.63","westernmostLongitude":"-23.85"}},"locationName":"Ocean>Atlantic Ocean>North Atlantic Ocean","mappable":"Y","paleoData":[{"NOAADataTableId":"20732","coreLengthMeters":null,"dataFile":[{"NOAAKeywords":["earth 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