1/4/2000

    HOT CTD data were extracted from the HOT CDROM. Some stations had too many NaN's and were excluded from further processing. The data from stations ALOHA (22.75N, 158W), Kaena Pt. (21.85N, 158.36W) and Kahe Pt. (21.34N, 158.27W) were used to generate mean potential density profiles from which buoyancy frequency, N, was calculated and plotted.
    The data were stratified into "seasons" as well (Jan-Mar, Apr-Jun, Jul-Sep, Oct-Dec), from which seasonal mean potential density and then seasonal mean N were generated. The postscript (`.ps' extension) plots in this directory show the results of these calculations. See the plot legends for the numbers of individual profiles that went into each mean.
    The standard deviation of the means was calculated using the bootstrapping technique, generating 300 separate estimates of each mean from random re-samples of the basic potential density profiles. The plots show the 2sigma (95%) confidence intervals for the means.
    The actual numbers from which the plots are made can be found in the `.dat' files. These are ascii columnar files, as follows:

all_N.dat - 3 columns of mean N from Kaena Pt., Kahe Pt. & Station
            Aloha, in that order. N is in rad/s. The rows are for 
            succesively increasing depth with a depth interval of
            2 db. The first row is at 1 db. The depths at each station
            are quite different, of course, so there are numerous
            NaN's in the Kahe Pt. & Kaena Pt. columns. Also note that
            near-surface values of N came out negative at times; these
            were not plotted.

all_N_stdev.dat - standard deviations of the means in all_N.dat,
            derived from the bootstrapping technique.

KaenaPt_N.dat - 4 columns of seasonal mean N (rad/s): Jan-Mar,
            Apr-Jun, Jul-Sep, Oct-Dec, in that order.

KaenaPt_N_stdev.dat - standard deviations of the seasonal means
            in KaenaPt_N.dat, derived from the bootstrapping technique.

KahePt_N.dat - 4 columns of seasonal mean N (rad/s): Jan-Mar,
            Apr-Jun, Jul-Sep, Oct-Dec, in that order.

KahePt_N_stdev.dat - standard deviations of the seasonal means
            in KahePt_N.dat, derived from the bootstrapping technique.

Stn_ALOHA_N.dat - 4 columns of seasonal mean N (rad/s): Jan-Mar,
            Apr-Jun, Jul-Sep, Oct-Dec, in that order.

Stn_ALOHA_N_stdev.dat - standard deviations of the seasonal means
            in Stn_ALOHA_N.dat, derived from the bootstrapping technique.