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Directions for Climate Timeseries Analysis/Plotting Page

Back to main plotting page.
  1. Specify first timeseries
    Choose from the list. Descriptions of the timeseries are available from the Download Indices webpage.
  2. Optional: Specify second timeseries
    Select if you wish to compare (correlation or cross-correlation plot) or plot both timeseries on SAME axes.
  3. Specify Year Range
    Optional: Plots or analysis will be calculated only for that year range. If range isn't entered, default is 1750 to 2004. Please enter low to high year. Enter integers only.
  4. Action. Type of plot or analysis.

    1. Plot.
      Option will return a line or box plot of the timeseries. If two timeseries are chosen, both will be plotted on the same axes. You may set the y-range (useful for comparisons). Please enter low to high. A running mean can be calculated. A simple running average for the month length is calculated. Any missing value causes the running mean to be missing (a bad idea, in general, I'll fix this). Using boxes with two datasets is generally not a good idea.
    2. Correlation.
      Requires two timeseries to be entered. Returns a simple linear correlation calculated for all months separately or a seasonal average. Lags can be specified in months. For correlation of anomalies, each month's long term mean is subtracted first (no seasonal cycle). You can change the climatology bounds when you use do anomaly correlations. Correlations themselves are based on the year range.
    3. Autocorrelation.
      Plots the correlation at ..,-5,-4,-3,-2,-1,0,1,2,3,4,5... lags of a timeseries with itself. Plot will be symmetric excluding end effects. The 1/e decorrelation time (in months) is printed assuming it exists.
    4. Cross correlation
      Plots the correlation at ..,-5,-4,-3,-2,-1,0,1,2,3,4,5... lags of a timeseries with another.
  5. Time Averaging
    Values are calculated for each month separately or you can use a "seasonal value" which is computed first (one value/year).Anomalies are computed by calculating a seasonal climatology based on the years used and then subtracting that. Enter season from first month to last
(Notes: Plots use gnuplot which is a rudimentary but very nice and quick.)

Back to main plotting page. Please send comments, problems or suggestions to me.


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NOAA ESRL Physical Sciences Division
Document maintained by Cathy Smith (cathy.smith@noaa.gov)
Updated: Apr 22, 2013 11:19:29 MDT
http://esrl.noaa.gov/psd/gcos_wgsp/Timeseries/Plot/Help/index.html
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