noaa-lake-35633 eng; USA utf8 dataset NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact NCEI Contact Information Information for contacts at NCEI. information pointOfContact NOAA World Data Service for Paleoclimatology Data Center Contact 828-271-4800 303-497-6513 325 Broadway, E/NE31 Boulder CO 80305-3328 USA paleo@noaa.gov pointOfContact 2024-01-22 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) NOAA/WDS Paleoclimatology - Central Sahara Ca/Ti Data during the Late-Holocene 2022-02-11 publication doi:10.25921/62gr-a479 noaa-lake-35633 NCEI DSI 1200_02 NCEI DSI 1200_01 Van der Meeren, T. originator Van der Meeren, T. author Verschuren, D. originator Verschuren, D. author Sylvestre, F. originator Sylvestre, F. author Nassour, Y.A. originator Nassour, Y.A. author Naudts, E.L. originator Naudts, E.L. author Aguilar Ortiz, L.E. originator Aguilar Ortiz, L.E. author Deschamps, P. originator Deschamps, P. author Tachikawa, K. originator Tachikawa, K. author Bard, E. originator Bard, E. author Schuster, M. originator Schuster, M. author Abderamane, M. originator Abderamane, M. author NOAA National Centers for Environmental Information publisher tableDigital 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 Lake. The data include parameters of paleolimnology with a geographic location of Chad, Central Africa. The time period coverage is from 2998 to -66 in calendar years before present (BP). See metadata information for parameter and study location details. Please cite this study when using the data. Records of past climate and environment derived from lake sediment records. 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. completed NOAA National Centers for Environmental Information ncei.info@noaa.gov https://www.ncei.noaa.gov/contact NCEI Contact Information Information for contacts at NCEI. information pointOfContact NOAA World Data Service for Paleoclimatology Data Center Contact 828-271-4800 303-497-6513 325 Broadway, E/NE31 Boulder CO 80305-3328 USA paleo@noaa.gov pointOfContact https://www.ncei.noaa.gov/pub/data/paleo/webimages/pc-default-lake.png Paleoclimatology - Lake PNG Earth Science > Climate Indicators > Paleoclimate Indicators > Ocean/Lake Records theme Global Change Master Directory (GCMD) Science Keywords 2025 revision 22 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 22. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology > geochemistry theme Global Change Master Directory (GCMD) Science Keywords 2025 revision 22 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 22. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian What: calcium/titanium; Material: sediment What: age; Material: null theme Paleoenvironmental Standard Terms (PaST) Thesaurus NOAA National Centers for Environmental Information https://www.ncei.noaa.gov/products/paleoclimatology/paleoenvironmental-standard-terms-thesaurus PaST Thesaurus information publisher Continent > Africa > Central Africa > Chad > Lake Teli, Ounianga Serir > LATITUDE 18.93 > LONGITUDE 20.873 place DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce dataCentre Global Change Master Directory (GCMD) Data Center Keywords 2025 revision 22 Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA) https://forum.earthdata.nasa.gov/app.php/tag/GCMD%2BKeywords GCMD Keyword Forum Page Global Change Master Directory (GCMD). 2025. GCMD Keywords, Version 22. Greenbelt, MD: Earth Science Data and Information System, Earth Science Projects Division, Goddard Space Flight Center (GSFC), National Aeronautics and Space Administration (NASA). URL (GCMD Keyword Forum Page): https://forum.earthdata.nasa.gov/app.php/tag/GCMD+Keywords information custodian otherRestrictions Cite as: Van der Meeren, T.; Verschuren, D.; Sylvestre, F.; Nassour, Y.A.; Naudts, E.L.; Aguilar Ortiz, L.E.; Deschamps, P.; Tachikawa, K.; Bard, E.; Schuster, M.; Abderamane, M. (2022-02-11): NOAA/WDS Paleoclimatology - Central Sahara Ca/Ti Data during the Late-Holocene. [indicate subset used]. NOAA National Centers for Environmental Information. https://doi.org/10.25921/62gr-a479. Accessed [date]. otherRestrictions 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. otherRestrictions 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 otherRestrictions None otherRestrictions 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. A predominantly tropical influence on late-Holocene hydroclimate variation in the hyper-arid central Sahara 2022 publication Van der Meeren, Thijs, Dirk Verschuren, Florence Sylvestre, Yacoub A. Nassour, Evi L. Naudts, Luis E. Aguilar Ortiz, Pierre Deschamps, Kazuyo Tachikawa, Edouard Bard, Mathieu Schuster, Moussa Abderamane author Science Advances publisher https://doi.org/10.1126/sciadv.abk1261 HTTPS Web Browser Associated Reference published 2022 Van der Meeren, Thijs, Dirk Verschuren, Florence Sylvestre, Yacoub A. Nassour, Evi L. Naudts, Luis E. Aguilar Ortiz, Pierre Deschamps, Kazuyo Tachikawa, Edouard Bard, Mathieu Schuster, Moussa Abderamane, 2022: A predominantly tropical influence on late-Holocene hydroclimate variation in the hyper-arid central Sahara. Science Advances, 8, , 10.1126/sciadv.abk1261 information crossReference sciencePaper eng; USA geoscientificInformation Date Range: 2998 cal yr BP to -66 cal yr BP; 20.873 20.873 18.93 18.93 Study Coordinates 18.93 20.873 -1048 2016 STUDY NOTES: The data represents XRF-derived Ca/Ti (log10-transformed) combined with age in cal yr BP (for details on the age model, consult the manuscripts suplementary information) Provided Keywords: Paleolimnology, moisture balance, Sahara ABSTRACT SUPPLIED BY ORIGINATOR: The climate history of the Sahara desert during recent millennia is obscured by the near-absence of natural climate archives, hampering insight in the relative importance of southerly (tropical) and northerly (mid-latitude) weather systems at sub-millennial time scales. A new lake-sediment record from Ounianga Serir oasis in northern Chad, spanning the Late Holocene without interruption, confirms that immediately prior to ca 4200 years ago the Sahara experienced an episode of hyper-aridity even more extreme than today’s desert climate. The hypersaline terminal lake which formed afterwards never desiccated during the Late Holocene due to continuous inflow of fossil groundwaterwhile, yet its water balance was sensitive to temporal variation in local rainfall and lake-surface evaporation. Our in-lake geochemical proxies show that during the last 3000 years, century-scale hydroclimate variation in the central Sahara primarily tracked the intensity of the tropical West African monsoon, modulated at shorter times scales by weather patterns linked to shifts in mid-latitude Atlantic Ocean circulation. 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Native Format(s) https://doi.org/10.25921/62gr-a479 HTTPS Landing Page Metadata Landing Page NCEI landing page with general information and links to access the data. information https://www.ncei.noaa.gov/access/paleo-search/study/35633 HTTPS Web Browser NOAA Study Page Study page with data access information. search https://www.ncei.noaa.gov/products/paleoclimatology/lake HTTPS Information NCEI Lake Page General information for this data type. information https://www.ncei.noaa.gov/pub/data/paleo/paleolimnology/africa/vandermeeren2022/vandermeeren2022.txt HTTPS Download NCEI Direct Download Direct download links for dataset files. download asNeeded This ISO metadata record was translated from DIF metadata using dif-9x-to-iso-19115-2.xsl Version: 2022-06-21