noaa-recon-22732 North America 2000 Year Hydroclimate Synthesis Shuman, B.N.; Routson, C.; McKay, N.P.; Fritz, S.C.; Kaufman, D.S.; Kirby, M.E.; Nolan, C.; Pederson, G.T.; St. Jacques, J.-M. North America 2000 Year Hydroclimate Synthesis 2018-04-25 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/22732 Investigator B.N. Shuman Investigator C. Routson Investigator N.P. McKay Investigator S.C. Fritz Investigator D.S. Kaufman Investigator M.E. Kirby Investigator C. Nolan Investigator G.T. Pederson Investigator J.-M. St. Jacques earth science paleoclimate reconstructions precipitation geoscientificInformation Other Hydroclimate Reconstruction 0 AD 2000 AD 1950 cal yr BP -50 cal yr BP Complete 25 70 -170 -50 Continent North America North America>LATITUDE >LONGITUDE 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 Bryan N. Shuman, Cody Routson, Nicholas McKay, Sherilyn Fritz, Darrell Kaufman, Matthew E. Kirby, Connor Nolan, Gregory T. Pederson, and Jeannine-Marie St-Jacques 2018 Climate of the Past 14 5 665-686 10.5194/cp-14-665-2018 https://www.clim-past.net/14/665/2018/

A synthesis of 93 hydrologic records from across North and Central America, and adjacent tropical and Arctic islands, reveals centennial to millennial trends in the regional hydroclimates of the Common Era (CE; past 2000 years). The hydrological records derive from materials stored in lakes, bogs, caves, and ice from extant glaciers, which have the continuity through time to preserve low-frequency ( > 100 year) climate signals that may extend deeper into the Holocene. The most common pattern, represented in 46 (49%) of the records, indicates that the centuries before 1000CE were drier than the centuries since that time. Principal component analysis indicates that millennial-scale trends represent the dominant pattern of variance in the southwestern US, northeastern US, mid-continent, Pacific Northwest, Arctic, and tropics, although not all records within a region show the same direction of change. The Pacific Northwest and the southernmost tier of the tropical sites tended to dry toward present, as many other areas became wetter than before. In 22 records (24%), the Medieval Climate Anomaly period (800-1300CE) was drier than the Little Ice Age (1400-1900CE), but in many cases the difference was part of the longer millennial-scale trend, and, in 25 records (27%), the Medieval Climate Anomaly period represented a pluvial (wet) phase. Where quantitative records permitted a comparison, we found that centennial-scale fluctuations over the Common Era represented changes of 3-7% in the modern interannual range of variability in precipitation, but the accumulation of these long-term trends over the entirety of the Holocene caused recent centuries to be significantly wetter, on average, than most of the past 11000 years.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/pages2k/NAm2kHydro-2017/data-version-1.0.0/ Data Folder; North American Hydroclimate Synthesis LiPD, MatLab, R, Excel Files GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/pages2k/NAm2kHydro-2017/noaa-templates/data-version-1.0.0/ Data Folder; North American Hydroclimate Synthesis NOAA Template Files GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/pages2k/NAm2kHydro-2017/data-version-1.0.0/readme-shuman2017.txt Data Description; North American Hydroclimate Synthesis Readme File USA/NOAA DIF Version 9.8.4 2019-06-03 2019-06-03