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Research: Hydrostation "S" data and graphs
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Sea Surface Temperature Oscillations at Hydrostation S

Research

The following figures show how sea surface temperature (SST) at Hydrostation S oscillates over periods of several time scales. The data set has thus far revealed oscillations on annual and approximately semi-decadal to decadal time scales. Clicking on the images allows you to save them as postscript files.

The regular seasonal pattern in SST at Hydrostation S is shown below. The black line ( -) is the average of all temperature data (x) available in the time series from 1955 through 1997 for each month. The two dotted red lines (- -) show the maximum and minimum temperatures observed over this time for each month. Errorbars are based on standard deviation values.

sst at Hydrostation S

Here are the data used to create the plot above with additional information on the dates of observed maximum and minimum temperatures as well as the number of samples used to calculate the mean for each month.

Month Mean temp. Max temp.
yr/mo/dy		 Max temp. Min temp.
yr/mo/dy		 Min temp. STD n
               
January 20.35 91/01/07 21.75 82/01/30 18.85 0.66 61
February 19.53 90/02/02 21.30 70/02/23 17.93 0.58 68
March 19.33 97/03/06 20.81 69/03/24 18.07 0.59 59
April 19.74 86/04/22 21.48 64/04/07 18.20 0.78 67
May 21.36 82/05/26 24.68 67/05/02 19.21 1.12 71
June 24.37 94/06/29 27.58 61/06/07 22.81 1.00 73
July 26.64 91/07/29 28.65 70/07/02 24.28 0.93 79
August 27.62 92/08/19 29.54 57/08/07 24.97 0.82 80
September 27.19 60/09/15 28.06 95/09/01 25.66 0.54 64
October 25.75 70/10/05 27.38 84/10/18 23.14 0.98 64
November 23.45 71/11/01 25.60 84/11/30 21.12 0.92 80
December 21.74 58/12/02 23.49 70/12/15 20.47 0.71 52

Two predominant long term oscillations in SST have been observed at Hydrostation S. The noisy blue lines ( -) below are identical in both figures and are seasonally normalized SST anomalies. A lo-pass filter was run on these normalized anomalies to produce the overlying black lines ( -) which emphasize the longer term oscillations.

 


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