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Bibliography

1
Marsden, R. F., R. Paquet, and R. G. Ingram. 1994. Currents under land-fast ice in the Canadian Arctic Archipelago Part 1: Vertical velocities. J. Mar. Res. 52:1017-1036.
2
Pringle, J. M., and K. H. Brink. In prep. High frequency internal waves on a sloping shelf.
3
Wallace, J. M., and R. E. Dickinson. 1972. Empirical orthogonal representation of time series in the frequency domain. Part I: Theoretical considerations. J. App. Met. 11:887-900.
 
 
 
 
 
Table 1: Cross-shore array configuration and ADCP parameters for the 1996 and 1997 data analyzed in this study.
 
      1996          1997     
  vert. x-shore sample pings per freq. vert. x-shore sample pings per freq.
D (m) res. (m) dist. (m) time (min) sample (kHz) res. (m) dist. (m) time (min) sample (kHz)
30 2 0 1 30 300 2 0 1 107 300
27.5 2 250 1 30 300          
25 2 500 1 30 300 2 500 1 111 300
22.5 2 750 1 30 300          
20 2 1000 1 30 300 1 1000 2 260 300
17.5 2 1250 1 30 300          
15 1 1500 1 30 1200          
 
 
 
 
 
 
Figure 1: Variance of the mode one vertical velocity cEOF amplitude, effectively the variance of mode one internal wave vertical velocity at the depth of maximum variance, at the ADCP stations of Table 1. In 1996, the variance was summed over all ten frequency bands within the range 0.0167 to 0.3 cpm. In 1997, the tenth band (0.225 to 0.3 cpm) was left out, because the Nyquist frequency for the 20 m ADCP (0.25 cpm) was within this band. At each station, the vertical velocity time series were broken into blocks of length 212 min (2.84 days), and cEOFs are calculated separately for each block. The plots show the variance estimated for each time block.
\begin{figure}\begin{center}\psfragscanon\epsfig{file=jal_fig1.eps,height=4.5in} \end{center} \end{figure}
 
 
 
 
Figure 2: Variance preserving power spectra of the mode one vertical velocity cEOF amplitude for the stations of Table 1. The vertical dashed lines mark the range of frequencies analyzed in this study (0.0167 to 0.3 cpm). For the 1996 data, all ten frequency bands were analyized. For the 1997 data, the highest frequency band (0.225 to 0.3 cpm) was not analyzed, because the Nyquist frequency for the 20 m ADCP (0.25 cpm) was within this band.
\begin{figure}\begin{center}\psfragscanon\epsfig{file=jal_fig2.eps,height=5in} \end{center} \end{figure}
 
 
 
 
Figure 3: Variance of the mode one vertical velocity cEOF at the depth of maximum variance. In 1996, the variance was summed over all ten frequency bands within the range 0.0167 to 0.3 cpm. In 1997, the tenth band (0.225 to 0.3 cpm) was left out, because the Nyquist frequency for the 20 m ADCP (0.25 cpm) was within this band. The variance was averaged over the duration of the analysis period in both years. The dashed lines are estimated variances using the shoaling model described in the text, an assumed buoyancy frequency of 0.263 cpm, and a dissipation constant, r of 2.0 x 10-4 s-1 in 1996 and 1.6 x 10-4 s-1 in 1997.
\begin{figure}\begin{center}\psfragscanon\epsfig{file=jal_fig3.eps,height=4.5in} \end{center} \end{figure}
 

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1998-09-08