noaa-cave-25970 Northern Morocco Last Millennium Speleothem Oxygen Isotope Data Ait Brahim, Y.; Wassenburg, J.A.; Cruz, F.W.; Sifeddine, A.; Scholz, D.; Bouchaou, L.; Dassié, E.P.; Jochum, K.P.; Edwards, R.L.; Cheng, H. Northern Morocco Last Millennium Speleothem Oxygen Isotope Data 2019-01-03 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/25970 Investigator Y. Ait Brahim Investigator J.A. Wassenburg Investigator F.W. Cruz Investigator A. Sifeddine Investigator D. Scholz Investigator L. Bouchaou Investigator E.P. Dassié Investigator K.P. Jochum Investigator R.L. Edwards Investigator H. Cheng earth science paleoclimate speleothems oxygen isotopes geoscientificInformation 1039 cal yr BP -50 cal yr BP Complete 33.84 33.95 -4.246 -4.09 1260 1260 Continent Africa Northern Africa Morocco Grotte de Piste>LATITUDE 33.84>LONGITUDE -4.09 Continent Africa Northern Africa Morocco Chaara Cave>LATITUDE 33.95>LONGITUDE -4.246 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 Yassine Ait Brahim, Jasper A. Wassenburg, Francisco W. Cruz, Abdelfettah Sifeddine, Denis Scholz, Lhoussaine Bouchaou, Emilie P. Dassié, Klaus P. Jochum, R. Lawrence Edwards, Hai Cheng 2018 Scientific Reports 8 10.1038/s41598-018-35498-x https://www.nature.com/articles/s41598-018-35498-x

Here we present a new composite record from two well-dated speleothem records from two caves in Northern Morocco. The high-resolution record covers the last millennium allowing to detect multi-decadal to centennial periodicities. Over the industrial period, d18O values of our speleothems are shown to be dominated by the main mode of decadal variability in the North Atlantic region: the North Atlantic Oscillation (NAO). Statistical analyses confirm the previously reported multi-decadal variability related to the influence of the Atlantic Multidecadal Oscillation (AMO) in the region. High power and persistent centennial-scale periodicities, similar to the Vries-Suess 200-year solar cycle, are observed as well. Indeed, comparison between solar activity reconstructions and our record confirms the in-phase relationship on centennial time-scales. Low d18O values, and hence negative phases of NAO that bring precipitation towards the Western Mediterranean, are observed during well-known solar minima periods. The results are consistent with previous models which describe low irradiance as a trigger for southward shifts of precipitation-bearing westerlies during winter. STUDY NOTES: Oxygen isotope (d18O) data from stalagmites collected in 2 caves in Northern Morocco (Chaara Cave stalagmite CHA2 and Grotte de Piste stalagmite GP5)

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/chaara2018d18o.txt NOAA Template File; Chaara Cave Stalagmite CHA2 d18O Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/grottedepiste2018d18o.txt NOAA Template File; Grotte de Piste Stalagmite GP5 d18O Data USA/NOAA DIF Version 9.8.4 2019-01-31 2019-01-31