noaa-lake-34573 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 2023-09-01 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) NOAA/WDS Paleoclimatology - Lake Walker, Québec 900 Year Varved Sediment Grain Size Data 2021-10-23 publication doi:10.25921/9y0x-m754 noaa-lake-34573 NCEI DSI 1200_02 NCEI DSI 1200_01 Lapointe, F. originator Lapointe, F. author Nzekwe, O.P. originator Nzekwe, O.P. author Francus, P. originator Francus, P. author St-Onge, G. originator St-Onge, G. author Lajeunesse, P. originator Lajeunesse, P. author Fortin, D. originator Fortin, D. author Jenny, J.-P. originator Jenny, J.-P. author De Coninck, A. originator De Coninck, A. author Philippe, E.G.H. originator Philippe, E.G.H. author Labarre, T. originator Labarre, T. 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 Quebec, Canada. The time period coverage is from 3249 to 2300 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 earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology earth science > paleoclimate > paleolimnology > physical properties 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 North Atlantic Oscillation theme What: age; Material: null What: varve thickness; Material: null What: grain size class; Material: sediment What: sample identification; Material: null What: grain size standard deviation; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size median; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: depth; Material: null What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: age; Material: null What: grain size parameter; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment What: grain size class; Material: sediment 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 > North America > Canada > Quebec > Lake Walker Quebec > LATITUDE 50.3 > LONGITUDE -67.15 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: Lapointe, F.; Nzekwe, O.P.; Francus, P.; St-Onge, G.; Lajeunesse, P.; Fortin, D.; Jenny, J.-P.; De Coninck, A.; Philippe, E.G.H.; Labarre, T. (2021-10-23): NOAA/WDS Paleoclimatology - Lake Walker, Québec 900 Year Varved Sediment Grain Size Data. [indicate subset used]. NOAA National Centers for Environmental Information. https://doi.org/10.25921/9y0x-m754. 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 new ~ 900-year varved record in Lake Walker, Québec North Shore, eastern Canada: insight on late Holocene climate mode of variability 2022 publication Obinna P. Nzekwe, Francois Lapointe, Pierre Francus, Guillaume St-Onge, Patrick Lajeunesse, David Fortin, Jean-Philippe Jenny, Arnaud De Coninck, Edouard G.H. Philippe, Thibault Labarre author Journal of Paleolimnology publisher https://doi.org/10.1007/s10933-021-00220-x HTTPS Web Browser Associated Reference published 2022 Obinna P. Nzekwe, Francois Lapointe, Pierre Francus, Guillaume St-Onge, Patrick Lajeunesse, David Fortin, Jean-Philippe Jenny, Arnaud De Coninck, Edouard G.H. Philippe, Thibault Labarre, 2022: A new ~ 900-year varved record in Lake Walker, Québec North Shore, eastern Canada: insight on late Holocene climate mode of variability. Journal of Paleolimnology, 67, 35-57, 10.1007/s10933-021-00220-x information crossReference sciencePaper eng; USA geoscientificInformation Date Range: 3249 cal yr BP to 2300 cal yr BP; -67.15 -67.15 50.3 50.3 Study Coordinates 50.3 -67.15 -1299 -350 STUDY NOTES: Varved sediment grain size class and grain size index data from Lake Walker, Quebec, for ~3200-2300 yrBP. Scanning Electron Microscope based annual grain-size. The 99th percentile is a relative proxy for North Atlantic Oscillation variability. ABSTRACT SUPPLIED BY ORIGINATOR: This paper presents a new annually laminated record (varves) from Lake Walker, Quebec North Shore (eastern Canada) spanning the period from ~ 3230 to 2320 +- 20 cal BP. A ~ 3.5-m-long composite sequence was established with the best regular and continuous laminated intervals using computed tomography and high-resolution photographs. The varve chronology was built based on two methods: manual multi-parameter counting using the PeakCounter software, and manual counting on thin-section images obtained by scanning electron microscopy (SEM). The latter correlates more closely with the ages derived from AMS radiocarbon dating, suggesting that thin-section analysis is here a more reliable counting technique. Varves are clastic, composed of a silt layer deposited in spring and summer, and a clay layer deposited in winter. Annually resolved grain size obtained using image analysis technique on SEM images of thin sections and elemental composition from X-ray microfluorescence analyses performed on the floating varve chronology suggests that the record is sensitive to the North Atlantic Oscillation (NAO), as revealed by the strong co-variability with another lower resolution record from Greenland. This suggests that periods of negative winter NAO promoted a thicker snow cover that resulted in higher river discharges and stronger clastic component in the varves. In modern times, cooling of the North Atlantic in the mid 1970s to the late 1980s was also characterized by concurrent negative phase of NAO, which condition translated into increase snow precipitation over the region. Overall, these results highlight that the new Lake Walker varve record presents remarkable prospects of developing a longer and high-resolution paleoclimatological reconstruction of the NAO in a region where similar records are scarce. 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 distributor In most cases, electronic downloads of the data are free. However, fees may apply for custom orders, data certifications, copies of analog materials, and data distribution on physical media. Contact NCEI for other distribution options and instructions. Native Format(s) https://doi.org/10.25921/9y0x-m754 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/34573 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/northamerica/canada/pq/walker2021gs.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