A database of modern pollen samples from a network of sites from North America and Greenland, compiled by Whitmore et al. (2005). Associated climatic and vegetation data are also record. The version of the NAMPD included here is latest version 1-7.3 (February 2013), as of January 2016.
data(Pollen)data(Climate)
data(Biome)
data(Location)
For Pollen, a data frame of 4833 samples and 135 columns (the
unique identifier and 134 pollen taxa).
For Biome, a data frame of 4833 samples on, currently, a single
vegetation variable (plus the unique identifier):
ID2Unique, sequential number assigned by NAMPD.
FedorovaFactor; Vegetation type (Biome) See Whitmore et al. (2005), Figs 3 & 4. Reclassified biomes from Fedorova et al (1994).
For Location, a data frame of the latitude and longitude
locational data for 4833 samples.
ID2Unique, sequential number assigned by NAMPD.
LatitudeLatitude of the sampling location in decimal degrees.
LongitudeLongitude of the sampling location in decimal degrees.
For Climate, a data frame with 4833 observations on the
following 32 variables.
ID2Unique, sequential number assigned by NAMPD.
t[jan:dec]numeric vectors; Mean monthly temperatures for the indicated month. Degrees C.
p[jan:dec]numeric vectors; Mean total monthly precipitation (mm) for the indicated month.
tavenumeric; annual average temperature (Degrees C)
tmaxnumeric; maximum temperature (in Degrees C) observed over the period of record.
tminnumeric; minimum temperature (in Degrees C) observed over the period of record.
gdd0numeric; Growing degree days computed using a base of 0 degrees C.
gdd5numeric; Growing degree days computed using a base of 5 degrees C.
mtconumeric; mean temperature of the coldest month.
mtwanumeric; mean temperature of the warmest month.
annpnumeric; mean annual total precipitation (mm).
Note that the data for the pollen species are a mixture of types. The
DataForm variable contains information on the type of data
included for each site. The codes are:
raw counts
raw counts expressed as percentages
digitised counts
digitised counts expressed as percentages
counts in permille
This value is not known for all samples.
These datasets were extracted from Version 1.7 of the North American Modern Pollen Database.
All pollen species were included, however, only the Vegetation type (Biome) field of the AVHRR data and selected Climatic variables were extracted. Requests for additional variables to be included in the versions of the data included in the package should me sent to the package maintainer.
Whitmore, J., Gajewski, K., Sawada, M., Williams, J.W., Shuman, B., Bartlein, P.J., Minckley, T., Viau, A.E., Webb III, T., Anderson, P.M., and Brubaker L.B., 2005. North American and Greenland modern pollen data for multi-scale paleoecological and paleoclimatic applications. Quaternary Science Reviews 24:1828--1848.
Williams, J.W., Shuman, B., Bartlein, P.J., Whitmore, J., Gajewski, K., Sawada, M., Minckley, T., Shafer, S., Viau, A.E., Webb, III, T., Anderson, P.M., Brubaker, L.B., Whitlock, C. and Davis, O.K., 2006. An Atlas of Pollen-Vegetation-Climate Relationships for the United States and Canada. American Association of Stratigraphic Palynologists Foundation, Dallas, TX, 293p.
Williams, J.W. and Shuman, B., 2008. Obtaining accurate and precise environmental reconstructions from the modern analog technique and North American surface pollen dataset. Quaternary Science Reviews, 27: 669--687.
Fedorova, I.T., Volkova, Y.A., Varlyguin, E., 1994. World vegetation cover. Digital raster data on a 30-minute cartesian orthonormal geodetic (lat/long) 1080x2160 grid. In: Global Ecosystems Database Version 2.0. USDOC/NOAA National Geophysical Data Center, Bould, CO.
data(Pollen)
data(Climate)
data(Biome)
data(Location)
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