noaa-recon-8713 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 2025-06-16 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) NOAA/WDS Paleoclimatology - Trouet et al. 2009 NAO Reconstruction 2009-07-01 publication doi:10.25921/xtnr-jb42 noaa-recon-8713 NCEI DSI 1200_02 NCEI DSI 1200_01 Trouet, V. originator Trouet, V. author Esper, J. originator Esper, J. author Graham, N.E. originator Graham, N.E. author Baker, A. originator Baker, A. author Scourse, J.D. originator Scourse, J.D. author Frank, D.C. originator Frank, D.C. 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 Climate Reconstruction. The data include parameters of climate reconstructions|speleothems|tree ring with a geographic location of North Atlantic Ocean. The time period coverage is from 901 to -45 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 temperature, precipitation, and other climate variables derived from paleoclimate proxies. Parameter keywords describe what was measured in this data set. Additional summary information can be found in the abstracts of papers listed in the data set 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-recon.png Paleoclimatology - Climate Reconstruction PNG Earth Science > Climate Indicators > Paleoclimate Indicators > Paleoclimate Reconstructions 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 > climate reconstructions|speleothems|tree ring earth science > paleoclimate > climate reconstructions|speleothems|tree ring earth science > paleoclimate > reconstructions 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 Atmospheric and Oceanic Circulation Patterns Reconstruction theme What: age; Material: null What: North Atlantic Oscillation Index; 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 Ocean > Atlantic Ocean > North Atlantic Ocean > North Atlantic Oscillation > LATITUDE > LONGITUDE 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: Trouet, V.; Esper, J.; Graham, N.E.; Baker, A.; Scourse, J.D.; Frank, D.C. (2009-07-01): NOAA/WDS Paleoclimatology - Trouet et al. 2009 NAO Reconstruction. [indicate subset used]. NOAA National Centers for Environmental Information. https://doi.org/10.25921/xtnr-jb42. 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. Persistent Positive North Atlantic Oscillation Mode Dominated the Medieval Climate Anomaly 2009 publication Trouet, V., J. Esper, N.E. Graham, A. Baker, J.D. Scourse, and D.C. Frank author Science publisher https://doi.org/10.1126/science.1166349 HTTPS Web Browser Associated Reference published 2009 Trouet, V., J. Esper, N.E. Graham, A. Baker, J.D. Scourse, and D.C. Frank, 2009: Persistent Positive North Atlantic Oscillation Mode Dominated the Medieval Climate Anomaly. Science, 324, 78-80, 10.1126/science.1166349 information crossReference sciencePaper eng; USA geoscientificInformation Date Range: 1049 CE to 1995 CE; Date Range: 901 cal yr BP to -45 cal yr BP; -50 -10 38 65 1049 1995 STUDY NOTES: Winter NAO Reconstruction 1049-1995 AD. Decadal scale variations in a speleothem-based precipitation proxy from Scotland and a tree-ring based drought proxy from Morocco reflect quasi-regular occurrences of contrasting precipitation regimes over the Millennium. These proxy records are located centrally in the opposing poles of North Atlantic Oscillation (NAO) driven precipitation regimes. Analogous to the instrumental based NAO index, we combined both records to develop a near millennium-long (1049-1995) record of winter NAO (wNAO). A 30-year smoothing spline was applied to both proxy series and they were normalized over the common period before their residual was calculated. Extreme phases in the difference record (Scotland minus Morocco) corresponded to typical wNAO related geopotential height and precipitation patterns over Europe over the last three centuries. Low frequency NAO phases over the 20th century are well captured in the proxy record, which correlates reasonably well with instrumental wNAO index time series. On longer time-scales, the multidecadal variations in our wNAO reconstruction are similar to the ones found in previous NAO reconstructions. Our wNAO record, however, is 350 years longer than the currently longest reconstructions and extends into the Medieval Climate Anomaly (MCA), for which a persistent positive mode is reconstructed. ABSTRACT SUPPLIED BY ORIGINATOR: The Medieval Climate Anomaly (MCA) was the most recent pre-industrial era warm interval of European climate, yet its driving mechanisms remain uncertain. We present here a 947-year-long multidecadal North Atlantic Oscillation (NAO) reconstruction and find a persistent positive NAO during the MCA. Supplementary reconstructions based on climate model results and proxy data indicate a clear shift to weaker NAO conditions into the Little Ice Age (LIA). Globally distributed proxy data suggest that this NAO shift is one aspect of a global MCA-LIA climate transition that probably was coupled to prevailing La Nina-like conditions amplified by an intensified Atlantic meridional overturning circulation during the MCA. 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/xtnr-jb42 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/8713 HTTPS Web Browser NOAA Study Page Study page with data access information. search https://www.ncei.noaa.gov/products/paleoclimatology/climate-reconstruction HTTPS Information NCEI Climate Reconstruction Page General information for this data type. information https://www.ncei.noaa.gov/pub/data/paleo/treering/reconstructions/nao-trouet2009-noaa.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