noaa-ocean-5587 North Iceland Shelf (MD99-2269) Holocene Coccolith Abundance Data Giraudeau, J.; Jennings, A.E.; Andrews, J.T. North Iceland Shelf (MD99-2269) Holocene Coccolith Abundance Data 2004-07-01 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/5587 Investigator J. Giraudeau Investigator A.E. Jennings Investigator J.T. Andrews earth science paleoclimate paleoceanography identified coccolithophore,null,null,count,null,paleoceanography,null,null,N,Calcidiscus leptoporus earth science paleoclimate paleoceanography identified coccolithophore,null,null,count,null,paleoceanography,null,null,N,Helicosphaera carteri earth science paleoclimate paleoceanography depth,null,null,centimeter,null,paleoceanography,corrected,null,N,null earth science paleoclimate paleoceanography identified coccolithophore,null,null,count,null,paleoceanography,null,null,N,Emiliania huxleyi earth science paleoclimate paleoceanography age,null,null,calendar year before present,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography total coccoliths,null,null,count,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography identified coccolithophore,null,null,count,null,paleoceanography,null,null,N,Syracosphaera sp. earth science paleoclimate paleoceanography identified coccolithophore,null,null,count,null,paleoceanography,null,null,N,Gephyrocapsa muellerae earth science paleoclimate paleoceanography depth,null,null,centimeter,null,paleoceanography,null,null,N,null earth science paleoclimate paleoceanography identified coccolithophore,null,null,count,null,paleoceanography,null,null,N,Coccolithus pelagicus earth science paleoclimate paleocean physical properties earth science paleoclimate paleocean population abundance earth science paleoclimate paleocean age control geoscientificInformation 8919 14C yr BP -75 14C yr BP 9999 cal yr BP 0 cal yr BP Complete 66.63 66.63 -23.85 -23.85 -365 -365 Ocean Atlantic Ocean North Atlantic Ocean MD99-2269>LATITUDE 66.63>LONGITUDE -23.85 None 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. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Giraudeau, J., A.E. Jennings, and J.T. Andrews. 2004. Timing and mechanisms of surface and intermediate water circulation changes in the Nordic Seas over the last 10,000 cal years: a view from the North Iceland shelf. Quaternary Science Reviews, 23(20-22), 2127-2139.

The North Iceland shelf bears essential components of the present surface and intermediate circulation of the northern North Atlantic. Instrumental and historical data give evidence of the sensitivity of this domain to broad, regional-scale oceanic and atmospheric anomalies. Our investigation of the paleohydrological variability off Northern Iceland throughout the last 10 000 cal yr suggests that atmospheric forcing alone, through combined changes in strength of the wind stress curl and sea-level atmospheric pressure pattern over the Nordic Seas, is sufficient to explain the recorded changes in origins and dynamics of surface and intermediate water masses. Our biotic proxies, coccoliths and benthic foraminifera, were extracted from a giant piston core (MD99-2269) collected in a shelf trough where sediment accumulated at an excess rate of 2 m/kyr. The mid-Holocene from 6.5 to 3.5 cal kyr BP was a time of peaked carbonate production and subsequent sedimentation, and strong water-column stratification with a thick layer of cold-fresh Arctic surface water overlapping an enhanced flow of Irminger/Atlantic Intermediate water. Applying conditions triggering present-time carbonate plankton blooms in the studied area, we infer that a lowered cyclonic activity associated with decreased winter storms and reduced production of Arctic Intermediate Water in the Iceland Sea were conductive of the recorded mid-Holocene water column structure. The opposite situation (warm Atlantic surface water, low vertically-integrated inflow of Irminger water, abutment of Arctic Intermediate water in deep shelf troughs) characterized the early Holocene as well as a shorter late Holocene period centred at 2 cal kyr BP. The Little Ice Age (ca. 0.2ŋ0.6 cal kyr BP) and a short event at around 3 cal kyr BP stand as times of extreme advection of polar waters and extended seaŋice development. A comparison of the recorded long-term Holocene evolution of water column structure off Northern Iceland with climate and hydrological changes in the north-eastern Atlantic suggests that the strength of Atlantic inflow into the Nordic Seas was subjected to a balance between the Irminger and the Norwegian branches. This balance is thought to be mostly related to changes in the intensity and location of westerly winds and associated atmospheric pressure gradients in the North Atlantic.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/giraudeau2004 GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/m99-2269-tab.txt USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11