noaa-recon-12902 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 2025-01-10 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) NOAA/WDS Paleoclimatology - Northern Hemisphere Extratropical 2000 Year Temperature Reconstruction 2012-04-19 publication doi:10.25921/2py4-6d71 noaa-recon-12902 NCEI DSI 1200_02 NCEI DSI 1200_01 Christiansen, B. originator Christiansen, B. author Ljungqvist, F.C. originator Ljungqvist, F.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 with a geographic location of Northern Hemisphere. The time period coverage is from 1950 to -23 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 earth science > paleoclimate > climate reconstructions earth science > paleoclimate > climate reconstructions earth science > paleoclimate > climate reconstructions earth science > paleoclimate > climate reconstructions earth science > paleoclimate > climate reconstructions earth science > paleoclimate > climate reconstructions earth science > paleoclimate > climate reconstructions earth science > paleoclimate > climate reconstructions earth science > paleoclimate > climate reconstructions earth science > paleoclimate > climate reconstructions earth science > paleoclimate > reconstructions > air temperature 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 Air Temperature Reconstruction Little Ice Age (LIA) Medieval Warm Period theme What: temperature; Material: multiple proxies What: temperature; Material: multiple proxies What: temperature; Material: multiple proxies What: temperature; Material: multiple proxies What: temperature; Material: multiple proxies What: temperature; Material: multiple proxies What: temperature; Material: multiple proxies What: temperature; Material: multiple proxies What: temperature; Material: multiple proxies What: age; Material: null What: temperature; Material: multiple proxies 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 Geographic Region > Northern Hemisphere > Northern Hemisphere Extratropics > 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: Christiansen, B.; Ljungqvist, F.C. (2012-04-19): NOAA/WDS Paleoclimatology - Northern Hemisphere Extratropical 2000 Year Temperature Reconstruction. [indicate subset used]. NOAA National Centers for Environmental Information. https://doi.org/10.25921/2py4-6d71. 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. The extra-tropical Northern Hemisphere temperature in the last two millennia: reconstructions of low-frequency variability 2012 publication Christiansen, B. and F.C. Ljungqvist author Climate of the Past publisher https://doi.org/10.5194/cp-8-765-2012 HTTPS Web Browser Associated Reference published 2012 Christiansen, B. and F.C. Ljungqvist, 2012: The extra-tropical Northern Hemisphere temperature in the last two millennia: reconstructions of low-frequency variability. Climate of the Past, 8, 765-786, 10.5194/cp-8-765-2012 information crossReference sciencePaper eng; USA geoscientificInformation Date Range: 0 CE to 1973 CE; Date Range: 1950 cal yr BP to -23 cal yr BP; -180 180 30 90 0 1973 STUDY NOTES: 2000 year and 500 year temperature reconstructions for the Northern Hemisphere extratropical region (30°N-90°N) by the LOC method. The LOC method reconstructs the local temperatures at the locations of the proxies. The reconstruction is based on one-dimensional linear regression with the local temperature as the independent variable and the proxy as the dependent variable. The local reconstructed temperatures are then averaged to get the NH mean temperature. While this reconstruction method, LOC, is expected to catch the 50-year smoothed variability well, it exaggerates high-frequency variability. Hence, users are recommended to use the 50Yr-smoothed values for both the 2000-year long and 500-year long reconstructions. ABSTRACT SUPPLIED BY ORIGINATOR: We present two new multi-proxy reconstructions of the extra-tropical Northern Hemisphere (30-90°N) mean temperature: a two-millennia long reconstruction reaching back to 1AD and a 500-yr long reconstruction reaching back to 1500 AD. The reconstructions are based on compilations of 32 and 91 proxies, respectively, of which only little more than half pass a screening procedure and are included in the actual reconstructions. The proxies are of different types and of different resolutions (annual, annual-to-decadal, and decadal) but all have previously been shown to relate to local or regional temperature. We use a reconstruction method, LOCal (LOC), that recently has been shown to confidently reproduce low-frequency variability. Confidence intervals are obtained by an ensemble pseudo-proxy method that both estimates the variance and the bias of the reconstructions. The two-millennia long reconstruction shows a well defined Medieval Warm Period, with a peak warming ca. 950-1050AD reaching 0.6°C relative to the reference period 1880-1960 AD. The 500-yr long reconstruction confirms previous results obtained with the LOC method applied to a smaller proxy compilation; in particular it shows the Little Ice Age cumulating in 1580-1720AD with a temperature minimum of -1.0°C below the reference period. The reconstructed local temperatures, the magnitude of which are subject to wide confidence intervals, show a rather geographically homogeneous Little Ice Age, while more geographical inhomogeneities are found for the Medieval Warm Period. Reconstructions based on different subsets of proxies show only small differences, suggesting that LOC reconstructs 50-yr smoothed extra-tropical NH mean temperatures well and that low-frequency noise in the proxies is a relatively small problem. 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Native Format(s) https://doi.org/10.25921/2py4-6d71 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/12902 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/contributions_by_author/christiansen2012/christiansen2012-RecordsUsed_Metadata.txt HTTPS Download /contributions_by_author/christiansen2012/christiansen2012-RecordsUsed_Metadata.txt Original Data and Full Metadata download https://www.ncei.noaa.gov/pub/data/paleo/contributions_by_author/christiansen2012/christiansen2012-500yr-noaa.txt HTTPS Download /contributions_by_author/christiansen2012/christiansen2012-500yr-noaa.txt Original Data and Full Metadata download https://www.ncei.noaa.gov/pub/data/paleo/contributions_by_author/christiansen2012/christiansen2012-2k-noaa.txt HTTPS Download /contributions_by_author/christiansen2012/christiansen2012-2k-noaa.txt Original Data and Full Metadata download asNeeded This ISO metadata record was translated from DIF metadata using dif-9x-to-iso-19115-2.xsl Version: 2022-06-21