NOAA Paleoclimatology Reconstructions Network
Mann et al. 2008 Figure 1, proxy data locations
PCN PROXY DATA
The proxy data section of the PCN includes the 1209 time series used by Mann et al. in their recent reconstructions of hemispheric and global average temperatures (2008), and their gridded global reconstructions (2009). This accumulation is considered the most complete global proxy data set currently available for last 2+ millennium temperature reconstruction. The 1209 time series come in two versions: the original data as compiled by Mann et al., and each time series infilled as necessary by Mann et al. up to a common stopping year of 1998 using the regularized expectation maximization (RegEM) algorithm. Both the original and infilled versions of the data are provided in the three standard file formats, with overall metadata and header structure in the PCN format from the Mann et al. 2008 article. The metadata file containing information for all the individual time series as published by Mann et al. is also provided (ASCII and EXCEL formats). It should be noted that gridded temperature reconstructions in Europe (Luterbacher et al., 2004) are utilized as proxies in the Mann et al. reconstructions, and are thus included in the PCN proxy set.
Download PCN PROXY data from the NOAA/WDC Paleo archive:
Paleoclimate Network of 1209 time series from Mann et al. (2008/2009). Both the original and infilled time series are provided. Available files include the Data Description and Format, Original Proxy data in Text, Excel 2007, or netCDF format, and Infilled Proxy data in Text, Excel 2007, or netCDF format. [Note that the Excel files require the 2007 version in order to access the large number of proxy data columns.] A sample script to open the netCDF versions in the R programming environment is also provided.
To minimize the file size and column counts for the text and Excel format files, the sample depth counts for the proxy data were moved into separate data files. Available are the sample depth counts for the Original Proxy data in Text or Excel 2007 format, and sample depth counts for the Infilled Proxy data in Text or Excel 2007 format.
The Mann et al. metadata describing the 1209 data series are also available in both Text and Excel formats. The following list provides codes for the basic data types in the metadata (cf. column D in the Excel format). Note that a "1" at the end of the code number indicates less than annually-resolved data.
2000 Luterbacher et al. Europe gridbox annual temperature reconstructions
3000 Tree composites/reconstructions
3001 Marine sediments
4000 Lake sediments
5000 Various composites or reconstructions or historical records
6000 Cave deposits
7500 Schweingruber/Osborn latewood density tree ring gridbox series
8000 Ice cores
9000 ITRDB ring width and earlywood/latewood characteristic data
For the 106 records with data codes 3000, 4000, 5000, 6000, 7000, and 8000 (and corresponding 3001, etc. codes) more specificity concerning the proxy type for a particular record can be obtained from the information in columns Z ("script-call-name"), B ("description"), C ("Data type"), and AA (original reference information).
Citations for Data Source:
Mann, M.E., Z. Zhang, M.K. Hughes, R.S. Bradley, S.K. Miller, S. Rutherford, R.S and F. Ni. 2008. Proxy-based reconstructions of hemispheric and global surface temperature variations over the past two millennia. Proceedings of the National Academy of Sciences 105(36): 13252-13257.
Mann, M.E., Z. Zhang, S. Rutherford, R.S. Bradley, M.K. Hughes, D. Shindell, C. Ammann, G. Faluvegi and F. Ni. 2009. Global Signatures and Dynamical Origins of the Little Ice Age and Medieval Climate Anomaly. Science 326:1256-1260.
Downloaded Monday, 28-Jul-2014 15:05:32 EDT
Last Updated Friday, 10-Sep-2010 08:50:07 EDT by email@example.com
Please see the Paleoclimatology Contact Page or the NCDC Contact Page if you have questions or comments.