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OCEANOGRAPHY
Temperature Microstructure Profiles
From the Sub-Tropical Front
by
T. M. Dillon
and
D. R. Caldwell
OREGON STATE UNIVERSITY
Reference 80-18
Data Report 84
September 1980
Reproduction In whole or in part Is
permitted for any purpose of the
United States Government
SECUR1
TVASSI
:IC A riON
PAGE 'When Da:a Entered,
READ INSTRUCTIONS
BEFORE COMPLETING FORM
REPORT DOCUMENTATION PAGE
REp;;RT v,s.o3E9
12.
GOVT ACCESSION NO.
3.
RECIPIENT'S CATALOG NUMBER
5.
TYPE OF REPORT A PERIOD COVERED
80-16
4
- 1'"_E f ond Subtitle)
TEMPERATURE MICROSTRUCTURE PROFILES FROM
THE SUB-TROPICAL FRONT
7
Technical
6. PERFORMING ORG. REPORT NUMBER
AUT.OR(s)
8. CONTRACT OR GRANT NUMBER(s)
T.M. Dillon
D.R. Caldwell
9.
N00014-79-C-0004
PERFORMING ORGANIZATION NAME AND ADDRESS
I1
a ;0ERLEE161 ,
PROGRAM
AREA
10
School of Oceanography
Oregon State University
Corvallis, OR 97331
rTT,NPuRsiCaZT,
TASK
NR083-102
CONTROLLING OFFICE NAME AND ADDRESS
12.
REPORT DATE
Office of Naval Research
Ocean Science F Technology Division
Arlington, Virginia 22217
13.
NUMBER OF PAGES
15.
SECURITY CLASS. (al this report)
14. MONITORING AGENCY NAME A ADDRESS(// different from Controlling Office)
September 1980
Unclassified
IS..
DECLASSIFICATION/DOWNGRADING
SCHEDULE
16.
DISTRIBUTION STATEMENT (of this Report)
17.
DISTRIBUTION STATEMENT (of the abstract entered in Block 20, if different from Report)
Approved for public release, distribution unlimited
le. SUPPLEMENTARY NOTES
•
19.
KEY WORDS (Continue on reverse aide If nee...vary mid Identify by block number)
Sub-tropical front, microstructure, temperature profiles, kinetic
energy dissipation rates
20.
ABSTRACT (Continue on revers., •id• 11 n•c•••Ary and Identify by block number)
Preliminary temperature microstructure profiles resulting from . the FRONTS
experiment in January 1980 are presented. Also included are selected profiles
of the kinetic energy dissipation rate estimated by the Batchelor scale
technique.
DD ,
___
73 1473
EDITION OF I NOV 6S IS OOSOLETE
5/14 0103-014-66011
Unclassified
SECURITY CLASSIFICATION OF THIS PAGE (When DOI • Entered)
TEMPERATURE MICROSTRUCTURE PROFILES
FROM THE SUB-TROPICAL FRONT
by
T.M. Dillon and D.R. Caldwell
School of Oceanography
Oregon State University
Corvallis, Oregon 97331
Approved for public release, distribution unlimited
Reference 80-16
DATA REPORT 84
September, 1980
G. Ross Heath
Dean
ACKNOWLEDGEMENTS
The MSP instruments were constructed by S. Wilcox and J. Cantey.
Participating in the cruise were J. Cantey, S. Blood, and R. Moore. S.
Blood prepared the analysis software. Special thanks must be given to
the officers and crew of the R/V OCEANOGRAPHER. This experiment was funded
by the Office of Naval Research.
Table of Contents
Page
Acknowledgments
Introduction
1
References
Table of Station Locations
Map of Frontal Area
4
Weather Observations
5
Temperature Profiles
Optical Transmissivity
119
Kinetic Energy Dissipation Estimates
121
INTRODUCTION
This report is a preliminary presentation of temperature microstructure
data resulting from the FRONTS experiment in January 1980. During the experiment, four stations were occupied in the sub-tropical front area northeast of
Hawaii; in addition, a transect of five stations was run across an active
frontal area, and stations far north and far south of the frontal zone were
occupied for comparison with the fronts area.
The Microstructure Profiler (MSP) has been described in the literature
(Caldwell, Wilcox, and Matsler, 1975; Dillon and Caldwell, 1980a; Caldwell and
Dillon, 1980; Dillon and Caldwell, 1980b). Pre- and Post-cruise calibrations
of the thermistors agreed within 0.02°C. Two independent thermistors were
used on each instrument, and the temperature measured by each agreed to
within 0.02°C.
Temperatures were recorded with both a low gain and a high gain in the
amplifiers. The low-gain thermistors had a resolution of 4 millidegrees,
while the high-gain resolution was variable, and usually set at 0.16 millidegrees. The bulk of this report consists of plots of temperature depthderivative, low-gain temperature, and high-gain temperature. Often, the
high-gain temperature plots reveal much more structure, including small-scale
inversions and instabilities, than is apparent in the low-gain temperatures.
Kinetic energy dissipation rates were estimated using the Batchelor
scale or cut-off wavenumber technique (Dillon and Caldwell, 1980a; Caldwell
and Dillon, 1980; Caldwell, Chriss, Newberger and Dillon, 1981). Selected
profiles of the dissipation rate have been plotted in the last section of
this report.
The low-gain temperature plots contain the vertical temperature derivitive to the left in units of °C/M. The temperature scale is at bottom and
the depth in M is on the left. High-gain temperature profiles are limited
to water above the seasonal thermocline (usually -120m) because of dynamic
range limitations. The points plotted are not averages, but instantaneous
realizations which have been decimated so that the density of plotted points
is of order 200 points per inch regardless of the vertical scale.
At the'southernmost location, Station F8, the optical transmissivity
over a 30cm horizontal path length was measured. :Examples of the transmissivity profiles here have been plotted on an arbitrary scale, with
"dirty" water to the left, and "clean" water to the right. Much less vertical variation was noted for this Station than has been observed at Ocean
Station P or off the Oregon coast.
2
REFERENCES
Caldwell, D.R., S.D. Wilcox, and M. Matsler (1975). A relatively simple
freely-falling probe for small-scale temperature gradients. Limnology
and Oceanography, 20, pp 1035-1047.
Caldwell, D.R. and T.M. Dillon (1980). The scaling of temperature gradient
spectra. J. Geophys. Res., 85, (C4), pp 1917-1924.
Caldwell, D.R., T.M. Chriss, P.A. Newberger, T.M. Dillon (1981). The thinness
of oceanic temperature gradients. Accepted by J. Geophys. Res.
Dillon, T.M. and D.R. Caldwell (1980a). The Batchelor spectrum and dissipation
in the upper ocean. J. Geophys. Res., 85 (C4), pp 1910-1916.
Dillon, T.M. and D.R. Caldwell (1980b). High-frequency internal waves at
Ocean Station P. J. Geophys. Res., 85 (C6), pp 3277-3284 (1980b).
TABLE 1
Latitude and Longitude of Microstructure Stations
Occupied by the NOAA Ship OCEANGORAPHER
Station No.
Latitude-Longitude
Date (Jan 80)/Time (GMT)
Fl
33°56'N-150°2'W
15/01:56-15/13:37
F2
31°00'N-153°00'W
23/18:13-24/04:12
F3
30°20.4'N-153°37.3'W
24/18:25-24/23:52
F5 (transect)
30°20.9'N-153°36.2'W
25/18:35-25/19:30
30°16.1'N-153°42.6'W
25/20:40-25/21:01
30 0 10.1'N-152°49.8'W
25/23:00-26/00:02
30°01.6'N-153°57.2'W
26/00:54-26/02:58
29°59.5'N-154°00.6'W
26/03:51-26/05:18
F6
29°58.5'N-154°00.3'W
26/18:35-27/00:21
F7
29°52.5'N-154°06.9'W
27/02:12-27/08:13
F8
26°05.8'N-155°45.1 W
28/19:58-29/02:45
4
31°
z
0
D
30°
_J
29°
15 5 °
154°
153°
152°
LONGITUDE WEST
Map of the most intensively studied region, along a line extending to the
southwest from 31°N-153°W, overlayed on a preliminary map of sea-surface
temperature kindly supplied by Gunnar Roden. Large dark circles are stations
occupied for many casts, and large dark squares are transect stations
occupied only briefly.
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GMT DATE JAN 1980
WINO SPEED AND DIRECTION VS. TIME
Wind speed and direction as measured aboard the R/V OCEANOGRAPHER during
the FRONTS experiment; correction for ship motion has been included. (Plot
courtesy of C. Paulson.)
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