[Parameters: Topic='PALEOCLIMATE', Term='PALEOCLIMATE RECONSTRUCTIONS', Variable_Level_1='DROUGHT/PRECIPITATION RECONSTRUCTION']
Tree Ring Chronology Indexes and Reconstructions of Precipitation in Central Iowa, USA, CDIAC NDP-002Entry ID: CDIAC_NDP2
Abstract: This data package includes a reconstruction of annual precipitation for central Iowa for the period 1680-1979 based on tree ring chronologies. These data are useful indicators of the precipitation/drought history of the region over a three-century period. The indices have been used to estimate, or reconstruct, past values of numerous climatic and hydrologic variables, including large-scale ... seasonal patterns of temperature, precipitation, and atmospheric circulation. CDIAC Numerical Data Package 002 contains data on tree ring chronology indexes and annual precipitation reconstruction compiled by T. J. Blasing and D. N. Duvick of the Environmental Sciences Division at Oak Ridge National Laboratory.
Core samples 4 mm in diameter were extracted from the trunks of white oak (Quercus alba) trees at Ledges State Park, Pammel, and Duvick Back Woods sites in central Iowa. At least 60 trees were sampled at each site and at least 2 cores were taken from each tree. The ring widths were measured and transformed into dimensionless ring-width indices. Transformation was done to enhance any climatic 'signal' in the ring-width series by filtering out effects of tree age and other nonclimatic factors. These data have more than 50% of their variance in common with known annual statewide average precipitation for Iowa and serve as useful indicators of the precipitation and drought history of the region for the past 300 years.
All CDIAC numerical data packages include copies of pertinent literature discussing the data, summaries discussing the background, source and scope of the data, as well as applications limitations and restrictions of the data. This data set also resides on the CDIAC CD-ROM which contains many other CDIAC data sets.
CDIAC has provided an anonymous FTP area to all data files, retrieval codes, and descriptive files for the NDP's that are presently available. The FTP address is ftp://cdiac.esd.ornl.gov or 184.108.40.206 and input your email address as the password.
The NDP-002 data set is located in CDIAC's anonymous FTP in pub/ndp002. All files are compressed (UNIX) ASCII text files. All the data bases provided in this area are fully documented.
Data Set Citation
Dataset Originator/Creator: Blasing, T.J. and D.N. Duvick
Dataset Title: Tree-ring Chronology Indexes and Reconstructions of Precipitation in Central Iowa, USA
Dataset Series Name: Numeric Data Package
Dataset Release Place: Oak Ridge, TN
Dataset Publisher: Carbon Dioxide Information Analysis Center
Version: Not provided
Issue Identification: NDP-002Online Resource: http://cdiac.ornl.gov/ftp/ndp002/
Start Date: 1680-01-01Stop Date: 1979-12-31
Paleo Temporal Coverage
Paleo Start Date: 400 ybp
Paleo Stop Date: 0 ybp
Data Set Progress
Distribution Media: CD-ROM
Distribution Media: on-line (FTP)
Phone: (615) 574-7368
Fax: (615) 574-5788
Email: blasingtj at ornl.gov
Environmental Sciences Division Oak Ridge National Laboratory P. O. Box 2008
City: Oak Ridge
Province or State: Tennessee
Postal Code: 37831
Environmental Sciences Division Oak Ridge National Laboratory P.O. Box 2008
City: Oak Ridge
Province or State: TN
Postal Code: 37831
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 1970-01-01
Last DIF Revision Date: 2018-06-08