NOAA NCDC National Climatic Data Center
NOAA Paleoclimatology Program, NCDC Paleoclimatology Branch  
Paleoclimatology Navigation Bar Bookmark and Share
NOAA National Environmental Satellite, Data, and Information Service National Oceanic and Atmospheric Administration NOAA National Climatic Data Center U.S. Department of Commerce Paleo Home Data Paleo Projects Paleo Perspectives Education and Outreach About Paleo Program Site Map

Alternative Method USA Summer PDSI Reconstructions- Time Series Plots, Zhang et al '04


In contrast with the point-by-point (PPR) local regression technique used previously by Cook, the tree-ring data were calibrated against the instrumental record of summer drought (June-August Palmer Drought Severity Index (PDSI)) based on application of the Regularized Expectation Maximization (RegEM) algorithm to relate large-scale patterns of variation in proxy and instrumental data over a common (twentieth century) interval. See complete Data Set Description for more details and to download entire data set.
Additionally, a regional analysis was done. The PDSI field was separated into eight relatively homogenous regions of summer drought through a cluster analysis.
Values for 1700 - 1894 are reconstructed. Data for 1895 to 1978 are instrumental data from Cook et al 1999.
Click on grid points to select or deselect grid cells. Multiple points can be selected for plotting.
Click 'Plot Selected Data' button when you have finished selecting point(s).
Grid Point(s) Selected For Plotting
Map of Grid Sites
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
check
Dividing Line
Privacy Policy information Open Access Climate Data Policy link USA logo Disclaimer information
Dividing Line
http://www.ncdc.noaa.gov/paleo/zhangpdsi.html
Downloaded Sunday, 31-Aug-2014 00:25:53 EDT
Last Updated Wednesday, 20-Aug-2008 11:33:56 EDT by paleo@noaa.gov
Please see the Paleoclimatology Contact Page or the NCDC Contact Page if you have questions or comments.