noaa-cave-20266 Grotte de Piste, Morocco 11.5 - 2.5 ka Speleothem Isotope and Geochemical Data Wassenburg, J.A.; Dietrich, D.; Fietzke, J.; Fohlmeister, J.; Jochum, K.P.; Scholz, D.; Richter, D.K.; Sabaoui, A.; Spötl, C.; Lohmann, G.; Andreae, M.O.; Immenhauser, A. Grotte de Piste, Morocco 11.5 - 2.5 ka Speleothem Isotope and Geochemical Data 2016-07-18 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/20266 Investigator J.A. Wassenburg Investigator D. Dietrich Investigator J. Fietzke Investigator J. Fohlmeister Investigator K.P. Jochum Investigator D. Scholz Investigator D.K. Richter Investigator A. Sabaoui Investigator C. Spötl Investigator G. Lohmann Investigator M.O. Andreae Investigator A. Immenhauser earth science paleoclimate instrumental collection date,null,null,null,null,instrumental,null,null,C,null earth science paleoclimate speleothems depth,null,null,millimeter,null,speleothems,null,null,N,null earth science paleoclimate speleothems delta 13C,calcium carbonate,null,per mil VPDB,null,speleothems,detrended,isotope ratio mass spectrometry,N,null earth science paleoclimate speleothems uranium,calcium carbonate,null,parts per million,null,speleothems,raw,inductively-coupled plasma mass spectrometry|laser ablation,N,null earth science paleoclimate speleothems delta 18O,calcium carbonate,null,per mil VPDB,null,speleothems,detrended,isotope ratio mass spectrometry,N,null earth science paleoclimate speleothems magnesium/calcium,calcium carbonate,null,mole per mole,null,speleothems,raw,inductively-coupled plasma mass spectrometry|laser ablation,N,null earth science paleoclimate speleothems strontium,calcium carbonate,null,parts per million,null,speleothems,raw,inductively-coupled plasma mass spectrometry|laser ablation,N,null earth science paleoclimate speleothems yttrium,calcium carbonate,null,parts per million,null,speleothems,raw,inductively-coupled plasma mass spectrometry|laser ablation,N,null earth science paleoclimate speleothems phosphorus,calcium carbonate,null,parts per million,null,speleothems,raw,inductively-coupled plasma mass spectrometry|laser ablation,N,null earth science paleoclimate speleothems age,null,null,calendar kiloyear before present,null,speleothems,null,null,N,null earth science paleoclimate instrumental air temperature,null,null,degree Celsius,null,instrumental,raw,null,N,outside air temperature earth science paleoclimate speleothems trace metals earth science paleoclimate speleothems carbon isotopes earth science paleoclimate speleothems oxygen isotopes earth science paleoclimate speleothems geochemistry geoscientificInformation North Atlantic Oscillation 11416 cal yr BP -62 cal yr BP Complete 33.84 33.84 -4.09 -4.09 1260 1260 Continent Africa Northern Africa Morocco Grotte de Piste>LATITUDE 33.84>LONGITUDE -4.09 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 Jasper A. Wassenburg, Stephan Dietrich, Jan Fietzke, Jens Fohlmeister, Klaus Peter Jochum, Denis Scholz, Detlev K. Richter, Abdellah Sabaoui, Christoph Spotl, Gerrit Lohmann, Meinrat O. Andreae, Adrian Immenhauser 2016 Nature Geoscience 10.1038/ngeo2767 http://www.nature.com/ngeo/journal/vaop/ncurrent/full/ngeo2767.html

The North Atlantic Oscillation is the dominant atmospheric pressure mode in the North Atlantic region and affects winter temperature and precipitation in the Mediterranean, northwest Europe, Greenland, and Asia. The index that describes the sea-level pressure difference between Iceland and the Azores is correlated with a dipole precipitation pattern over northwest Europe and northwest Africa. How the North Atlantic Oscillation will develop as the Greenland ice sheet melts is unclear. A potential past analogue is the early Holocene, during which melting ice sheets around the North Atlantic freshened surface waters, affecting the strength of the meridional overturning circulation. Here we present a Holocene rainfall record from northwest Africa based on speleothem d18O and compare it against a speleothem-based rainfall record from Europe. The two records are positively correlated during the early Holocene, followed by a shift to an anti-correlation, similar to the modern record, during the mid-Holocene. On the basis of our simulations with an Earth system model, we suggest the shift to the anti-correlation reflects a large-scale atmospheric and oceanic reorganization in response to the demise of the Laurentide ice sheet and a strong reduction of meltwater flux to the North Atlantic, pointing to a potential sensitivity of the North Atlantic Oscillation to the melting of ice sheets. STUDY NOTES: Stable isotope, geochemical, and trace metals data from speleothems collected in Grotte de Piste, Morocco for 11,500 - 2,500 years before present.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/grottedepiste2016bu4mg-ca.txt Data File; Stalagmite BU4 Mg/Ca Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/grottedepiste2016iso.txt Data File; Stalagmite GP2 Stable Isotope Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/grottedepiste2016elem.txt Data File; Stalagmite GP2 Trace Element Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/grottedepiste2016temp.txt Data File; Grotte de Piste Outside Air Temperature Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/grottedepiste2016bu2mg-ca.txt Data File; Stalagmite BU2 Mg/Ca Data USA/NOAA DIF Version 9.8.4 2019-01-31 2019-01-31