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In order to help ensure that this web analysis page remains available, we would greatly appreciate feedback on its use, particularily in the clasroom, for presentations or for research. Mail to Cathy Smith at (cathy.smith@noaa.gov).

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Background Information
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Current PSD (Web/Data Status). PSD has undergone major URL restructuring so that all URLs start with http://www.esrl.noaa.gov/psd/ (More Info). OPeNDAP Data access is now open without IP restrictions.
 
PSD's 20th Century Reanalysis dataset has ben restored and is currently publicly available.

20th Century Reanalysis Daily Composites

Plot daily composites (averages) of the mean or anomalies (mean - total mean) of variables from the 20th Century Reanalysis reanalysis and other datasets. 20th century reanalysis data is available from Jan 1908 to Dec 1958.

? Which variable? Level?
Enter Year, Month and Day for composites To subtract one set of days from another, use a minus sign (-) before the years of the days that are to be subtracted. Default is last available date for variable.
           
           
           
           
           
OR to Enter Year of last day of range
OR File with Dates Optional Plot Label replaces list of dates.
Filename: Plot Label:
Days to add or subtract:
This number of days will be added (or subtracted) from all input dates. Please use all positive dates for input.
? OR Enter range of years: to (optional minus to )
? OR List of years: Enter filename:
? Lag: Plot composites for months before or after dates chosen
? Color? Shading:
? Plot type? Mean Anomaly Long Term Mean
? Scale plot size (%)   Plot contour labels? No Yes
? Reverse colorbar? No Yes
? Override default contour interval? Interval: Range: low high
? Map projection

If CUSTOM projection:
Lowest lat: (-90 to 90) Highest lat:
Western-most longitude (0 to 360): Eastern-most longitude:
CUSTOM projection:

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