%======================================================================
%                    C M / T E M P V A R . T E X 
%                    doc: Sat Mar  4 17:41:03 2000
%                    dlm: Thu Jun  1 22:04:22 2000
%                    (c) 2000 A.M. Thurnherr
%                    uE-Info: 61 40 NIL 0 0 72 3 2 4 ofnI
%======================================================================

\begin{table}[t]

\begin{center}\begin{tabular}{|l||ccccccc|c|}\hline
%----------------------------------------------------------------------
Depth 	 & B  & C  & D  & E  & F  & G  & H  & mean \\ \hline
%----------------------------------------------------------------------
\m{1800} & 69 & 59 & 58 & 54 & 45 & 56 & 45 & 55 \\
\m{2100} & 27 & 32 & 27 & 29 & 24 & 35 & 22 & 28 \\
\m{2300} & 18 & 24 & 19 & 16 & 13 & 25 & 19 & 19 \\ \hline
%----------------------------------------------------------------------
\end{tabular}\end{center}

\caption[Current-meter RMS temperature amplitudes]{RMS temperature
amplitudes in units of \degC{10^{-3}} for periods less than one week.}

\labelTab{CM-tempvar}

\end{table}

From the temperature power spectra RMS amplitudes were calculated for
comparison with the temperature variability observed during the
hydrographic surveys \rchap{HYD}. Because of the sampling times of the
surveys all frequencies outside the LF band were used \rtab{CM-fbands}.
A comparison between the three temporal regimes indicates no
significant differences. Therefore, the variances were calculated from
the full records. \rTabNP{CM-tempvar} shows the resulting values for
all instruments as well as depth averages. The temperature variance
decreases everywhere with increasing depth and the magnitudes are
consistent with the hydrographic surveys. The smallest overall
variability is found on moorings F and H, i.e.\ away from \RR.

%----------------------------------------------------------------------

\begin{figure}[t]

\placeFig{CM/tempvarflow}

\caption[Temperature observations during onset of return flow]{Hourly
temperatures and daily-averaged flow speeds of the last two months of
mooring deployment recorded by instrument B18.}

\labelFig{CM-tempvarflow}

\end{figure}

\rFigNP{CM-tempvarflow} indicates that the temperature variability was
not temporally uniform everywhere, however. The increase in the
daily-averaged flow speed between days 517 and 527 marks the onset of
the SW-ward flow across \RS at \m{1800} (e.g.\ \rfigNP{F2-CM}). In
addition to the strong (approximately factor 2) decrease in the
high-frequency temperature amplitude, the increase in flow speed is
accompanied by a temperature drop of order \degC{0.2}. Inspection of
the hourly velocity measurements reveals no apparent reduction in the
high-frequency flow variability. The data recorded by instruments D18
and, to a somewhat lesser extent, G18 show similar features.


