Chemistry Reference
In-Depth Information
(Fig. 2b). Different plotting symbols are used to identify sub-normal (cir-
cles and down triangles) and super-normal (pluses and up triangles) from
the normal segments (crosses).
Fig. 2:
Enlarged plots of the segments near the internal wave event. (a) Mean
square curvature (u: normal, + and ': super-normal, 1.5 and 3 dB, respectively, o
and : subnormal, -1.5 and -3 dB, respectively), (b) wind speed (symbols are the
same as those in (a)), (c) surface water temperature, (d) dimensionless wave num-
ber spectra,
B
(
k
), (e) same as (d) but in logarithmic scales, (f) normalized spectra.
In (d-f), the mean spectrum is shown by pluses, the dashed curves are the 3 dB en-
velops, and the dash-and-dotted curves are the 6 dB envelops
Three groups of enhanced roughness can be identified. (1) At the lead-
ing edge of the internal wave,
t
|3190 s, there are two closely spaced
roughness spikes. Using the average drift velocity of the buoy, 0.31 m s
-1
computed from the retrieval and deployment locations, the separation dis-
tance of the two spikes was approximately 3 m. (2) At the trailing edge
there are another two spikes more widely separated, at
t
| 3700 and 3820 s.
The distance of separation calculated with the mean drift velocity was 36
m. (3) Between these two sets of roughness spikes, a region (between
t
|
3460 and 3530 s) of super-normal roughness with very low wind speeds
but above-average surface roughness was observed. The water temperature
profile indicates some noticeable perturbations (see fig. 1a for a better per-
