Eastern North America 18,000 Year Vegetation Mapping Overpeck, J.T.; Webb, R.S.; Webb, T. Overpeck, J.T. Webb, R.S. Webb, T. Vegetation Reconstruction 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 (Eastern North America>LATITUDE >LONGITUDE ) 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. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Overpeck, J.T. Investigator : Webb, R.S. Investigator : Webb, T. 1994-06-21 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/16442 https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/veg18k/latlonxy.dat https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/veg18k/numberto.veg https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/veg18k/readme_veg18k.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/veg18k/modrnveg.dat https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/veg18k/fossveg.dat https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/veg18k/latlonxy.dat https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/veg18k/numberto.veg https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/veg18k/readme_veg18k.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/veg18k/modrnveg.dat https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/veg18k/fossveg.dat English https://www.ncdc.noaa.gov/paleo/study/16442 https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/veg18k/latlonxy.dat https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/veg18k/numberto.veg https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/veg18k/readme_veg18k.txt https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/veg18k/modrnveg.dat https://www1.ncdc.noaa.gov/pub/data/paleo/pollen/veg18k/fossveg.dat Jonathan T. Overpeck, Robert S. Webb, and Thompson Webb III 1992Mapping eastern North American vegetation change of the past 18 ka: No-analogs and the futureGeology20121071-107410.1130/0091-7613(1992)020<1071:MENAVC>2.3.CO;2 http://geology.gsapubs.org/content/20/12/1071.abstract START YEAR: 18000 cal yr BP * END YEAR: 0 cal yr BP -100 23 -50 50