Pollen: North American Modern Pollen Database

In gavinsimpson/analogue: Analogue and Weighted Averaging Methods for Palaeoecology

Description

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.

Usage

data(Pollen)

data(Climate)

data(Biome)

data(Location)

Format

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):

ID2

Unique, sequential number assigned by NAMPD.

Fedorova

Factor; 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.

ID2

Unique, sequential number assigned by NAMPD.

Latitude

Latitude of the sampling location in decimal degrees.

Longitude

Longitude of the sampling location in decimal degrees.

For Climate, a data frame with 4833 observations on the following 32 variables.

ID2

Unique, 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.

tave

numeric; annual average temperature (Degrees C)

tmax

numeric; maximum temperature (in Degrees C) observed over the period of record.

tmin

numeric; minimum temperature (in Degrees C) observed over the period of record.

gdd0

numeric; Growing degree days computed using a base of 0 degrees C.

gdd5

numeric; Growing degree days computed using a base of 5 degrees C.

mtco

numeric; mean temperature of the coldest month.

mtwa

numeric; mean temperature of the warmest month.

annp

numeric; mean annual total precipitation (mm).

Details

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.

Warning

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:

RC

raw counts

RP

raw counts expressed as percentages

DC

digitised counts

DP

digitised counts expressed as percentages

PM

counts in permille

This value is not known for all samples.

Source

The database is archived electronically at two sites:

http://www.lpc.uottawa.ca/data/modern/index.html

https://williamspaleolab.github.io/datavis/

References

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.

Examples

data(Pollen)

data(Climate)

data(Biome)

data(Location)

gavinsimpson/analogue documentation built on June 17, 2021, 2:37 a.m.