All of the
fields displayed as meridionaltime sections are fields of gridded 5Day
or monthly means. The same gridding routine is used for all fields.
The time
Means at the array locations are gridded to 1 deg in latitude using the
following method.
First, anomalies are computed at the nominal TAO / TRITON array
coordinates by subtracting climatological averages from the data means
after bilinearly interpolating the climatology field in latitude and longitude
to the array coordinates. In the case of 5Day means, the climatology
is also interpolated linearly in time to the data times.
Second, the anomalies are linearly interpolated, first
in longitude where there are single missing values, second in time where
gaps are smaller than 6 time intervals, and finally in latitude, where
gaps are smaller than 7 degrees.
Third, this gridded anomaly field is added to the climatology
to produce the gridded mean field. Finally, both the means and anomalies
are smoothed in time using a binomial (1/41/21/4) filter.
The original locations of data at the beginning and ending of the time
series are shown by the little boxes on the vertical axes.
This gridding
method is a variant of that used for the LatLong maps which was developed
by Dr. William S. Kessler, Dr. Michael J. McPhaden, and Dai McClurg, all
at PMEL/NOAA.
