noaa-recon-16442 Eastern North America 18,000 Year Vegetation Mapping Overpeck, J.T.; Webb, R.S.; Webb, T. Eastern North America 18,000 Year Vegetation Mapping 1994-06-21 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/16442 Investigator J.T. Overpeck Investigator R.S. Webb Investigator T. Webb earth science paleoclimate instrumental longitude,null,null,degree east,null,instrumental,null,null,N,null earth science paleoclimate climate reconstructions|pollen biome,null,null,dimensionless,null,climate reconstructions|pollen,null,null,N,null earth science paleoclimate climate reconstructions|pollen age,null,null,radiocarbon year before present,null,climate reconstructions|pollen,null,null,N,null earth science paleoclimate climate reconstructions|pollen longitude,null,null,degree east,null,climate reconstructions|pollen,null,null,N,null earth science paleoclimate instrumental latitude,null,null,degree north,null,instrumental,null,null,N,null earth science paleoclimate instrumental biome,null,null,dimensionless,null,instrumental,null,null,N,null earth science paleoclimate climate reconstructions|pollen latitude,null,null,degree north,null,climate reconstructions|pollen,null,null,N,null earth science paleoclimate reconstructions vegetation geoscientificInformation Vegetation Reconstruction 18000 cal yr BP 0 cal yr BP Complete 23 50 -100 -50 Continent North America Eastern 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

325 Broadway, E/NE31

Boulder CO 80305-3328 USA online ASCII Jonathan T. Overpeck, Robert S. Webb, and Thompson Webb III 1992 Geology 20 12 1071-1074 10.1130/0091-7613(1992)020<1071:MENAVC>2.3.CO;2 http://geology.gsapubs.org/content/20/12/1071.abstract

The method of modern analogs and an extensive data base of modern and fossil pollen data were used to generate a new series of paleovegetation maps for eastern North America spanning the past 18 ka. The maps illustrate the continuous nature of climate-induced vegetation change and the development, after about 10 ka, of modern regional vegetation patterns. Before the Holocene, vegetation biomes without modern analogs were widespread in response to climate conditions without modern analogs and, to a lesser extent, to the rapidity of climate change over the last glacial-interglacial transition. This geological perspective suggests that possible future climate changes could force similarly complex changes in natural vegetation, including the development of biomes without modern analogs. STUDY NOTES: These maps are based on 11,700 fossil pollen samples and 1744 modern pollen samples. Twenty-one pollen taxa were included in analyses: Alnus, Fraxinum, Populus, Tilia, Fagus, Betula, Ulmus, Abies, Celtis, Corylus, Tsuga, Carya, Ostrya/Carpinus, Quercus, Pinus, Prairie, Cyperaceae, Picea, Liquidambar, Platanus, and Juglans. Analog/no anolog vegetation types were assigned to a 100x100km at 1000 year intervals using a three dimensional, time-space, interpolation scheme. To generate maps the paleocoast line/ocean and Laurentide Ice Sheet were overlain to mask out appropriate portions of equal area grid boxes. Age estimates are based on uncalibrated radiocarbon dates.

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/veg18k/latlonxy.dat Data File; Lat-Long XY pairs GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/veg18k/numberto.veg Data File; Vegetation Type Codes GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/veg18k/readme_veg18k.txt Data File; Data Description GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/veg18k/modrnveg.dat Data File; Modern Vegetation Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/veg18k/fossveg.dat Data File; Fossil Vegetation Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11