3.0
COARDS/WOCE
TRACK
SADCP
SADCP
UNIVERSITY OF RHODE ISLAND
none
none
OLE92.FALL
00090
00090.sub
12 Apr 2002
hour
mean centered on hour
10 meters
mean centered on given depth
average over hour
The following time, space, and depth ranges for this cruise
are based on the complete high-resolution data set and does
not agree exactly with the ranges of this averaged subset.
#DATA_DATES: 1992/10/30 22:16:00 --- to --- 1993/01/28 20:18:00
#LON_RANGE: 74.08 W --- to --- 64.57 W
#LAT_RANGE: 32.20 N --- to --- 40.66 N
#DEPTH_RANGE: 13 --- to --- 408 m
#SAC_CRUISE_ID: 00090
#PLATFORM_NAME: M.V. Oleander (commercial container vessel)
#PRINCIPAL_INVESTIGATOR_NAME: T.Rossby, E.Gottlieb, G.Schwartze
#PI_INSTITUTION: University of Rhode Island
#PI_COUNTRY: USA
#PROJECT: The Oleander Project
#CRUISE_NAME: ole92.fall
#PORTS: Port Elizabeth, New Jersey --- to --- Hamilton, Bermuda
#GEOGRAPHIC_REGION: Northwest Atlantic Ocean
#PROCESSED_BY: Erik Gottlieb
#NAVIGATION: gps
#QUALITY_NAV: good
#GENERAL_INFORMATION:
CRUISE NOTES
CHIEF SCIENTIST ON SHIP : none
SIGNIFICANT DATA GAPS :*92/11/13-92/11/19 software failure
*92/12/22-92/12/25 Christmas holiday
*92/12/29-93/ 1/ 7 deck unit shut off
*93/ 1/11-93/ 1/14 cable plug stressed
* indicates total data loss
SPECIAL SHIP TRACK PATTERNS : weekly ship schedule is as follows:
Friday - leave Elizabeth (outbound)
Sunday - arrive Hamilton
Tuesday - leave Hamilton (inbound)
Thursday - arrive Elizabeth
COMMENTS : The only significant deviations from
the weekly schedule are due to bad
weather and port conflicts, and typically
are no more than 24 hours.
ADCP INSTRUMENTATION
MANUFACTURER : RD Instruments (RDI)
HARDWARE MODEL : RD-VM150
SERIAL NUMBERS : ADCP = 536 / XDUC = 449
FIRMWARE VERSION : 17.10
<the following 5 fields are specific to a given hardware model>
TRANSMIT FREQUENCY : 153 kHz
TRANSDUCER CONFIGURATION : JANUS CONCAVE
ACOUSTIC BEAM WIDTH :
TRANSDUCER BEAM ANGLE : 30 deg.
COMMENTS :
ADCP INSTALLATION
METHOD/DESCRIPTION OF THE
ATTACHMENT TO THE HULL : A seachest (well) is flush-welded
to the vessel's hull, so that the
seachest bottom is flush with the
hull's outer surface (the vessel bottom
is perfectly flat and smooth with no
protuberances). The transducer is
mounted on a top-hat which is bolted
on top of the seachest, such that the
transducer bottom is slightly above
the level of the seachest bottom.
For transducer removal, a water-tight
cover plate is bolted over the seachest
opening.
LOCATION/DEPTH ON HULL : The seachest is located several meters
foreward and starboard of the vessel's
center point. Vessel draught is load-
dependent, and averages about 4.9 m
Hamilton-bound (outbound) and 4.4 m
Elizabeth-bound (inbound).
Within the database, transducer depth is
set to a mean nominal depth of 4 m for
all legs.
REPEATABLE ATTACHMENT : YES
DATE OF MOST RECENT ATTACH. : 94/4/29
ACOUSTIC WINDOW : NO
COMMENTS : vessel length 117.5 m
breadth 19.8 m
weight 4950 tonnes
speed 16 knots
ADCP INSTRUMENT CONFIGURATION
<these are normally documented automatically and are part of Codas database>
ELZ NAR NBN (NYB) NBS SLS NWA BER
DEPTH RANGE UPPER (m) : 9.5 9.5 9.5 (14) 11 20 20 9.5
DEPTH RANGE LOWER (m) :15.5 15.5 47.5 (158) 107 404 404 15.5
BIN LENGTH (m) : 1 1 1 (4) 2 8 8 1
NUMBER OF BINS : 8 8 40 (38) 50 50 50 8
TRANSMIT PULSE LENGTH (m) : 1 1 2 (4) 4 16 16 1
BOTTOM TRACKING : no no yes (yes) yes no no no
BLANKING INTERVAL : ... 4 m ...
ENSEMBLE AVERAGING INTERVAL : ... 300 s ...
SOUND SPEED CALCULATION : ... FUNCTION OF TEMP AT TRANSDUCER ...
DIRECT COMMANDS : FH00001 E0005020099 CF25
COMMENTS : A user exit program automatically resets
the instrument configuration based upon
geographic location. The locations are
Port Elizabeth (ELZ), Verrazano Narrows
(NAR), New York Bight (NYB), Slope Sea
(SLS), Northwest Atlantic (NWA), and
Bermuda (BER). NYB and SLS are separated
by the shelf break, and SLS and NWA are
separated by the mean location of the Gulf
Stream. After 93/10/22 the NYB region
is split into north and south regions
(NBN and NBS). Prior to spring 1993
pulse length, bin length, and number of
bins were varied to find the optimal
value listed above. During 93/6/25-
93/8/12 a small region named test near
the center of the NWA region and
having an ensemble interval of several
seconds was used to observe the effects
of waves on data quality.
ADCP DATA ACQUISITION SYSTEM
SOFTWARE DEVELOPERS : RDI, Chris Humphries, Charlie Flagg,
and Joe Lewkowicz
SOFTWARE VERSIONS : DAS 2.48
DATA LOGGER, MAKE/MODEL : Oak Microsystems (12 MHz 386sx)
ADCP/LOGGER COMMUNICATION : serial
USER BUFFER VERSION : ASCII
CLOCK : PC clock
COMMENTS :
SHIP HEADING
INSTRUMENT MAKE/MODEL : Anschutz
SYNCHRO OR STEPPER : synchro before 93/6/17, stepper after
SYNCHRO RATIO : 360:1
COMPENSATION APPLIED : NO
GPS ATTITUDE SYSTEM : Ashtech 3DF installed 94/9/24
LOCATION OF ANTENNAS : Array located on port forward corner
of flying bridge, in an L shape
with about 3.5 m baseline distance
between antennas.
RIGID ATTACHMENT : YES - stainless steel rods clamped
to brackets welded to rail.
LOGGING RATE : 1 per sec
COMMENTS : Prior to 93/4/15 the gyrocompass
exhibited resets , where it would
unexpectedly slew to 0 but then
continue to track vessel heading.
Since the vessel steams a very nearly
constant heading, the resets were
corrected for by taking the difference
in headings before and after
the reset and applying that difference
as a heading misalignment angle.
During 92/10/30-93/2/27 calibration
values for heading misalignment and
scale factor were obtained directly
from bottom tracking each trip.
Between 93/2/27-93/4/15 data are of
very poor quality due to bad weather
(see QUALITY ASSESSMENT ) and
have not been calibrated. The
reset problem was solved by using a
separate repeater and computer to
bypass the DAS-aquired gyrocompass
heading. For calibration method
after 93/4/15, see CALIBRATION .
ANCILLARY MEASUREMENTS
SURFACE TEMP AND SALINITY : thermistor at transducer; no salinity
PITCH/ROLL MEASUREMENTS : none
HYDRO CAST MEASUREMENTS : none
BIOMASS DETERMINATION : YES - Using AGCAVE.COM
DATE OF LAST CALIBRATION :
CALIBRATION COEFFICIENTS :
BEAM-AVERAGED AGC AVAILABLE?: YES
CALIBRATION NET TOWS? : YES - Plankton recorder towed one
trip per month
COMMENTS :
NAVIGATION
TRANSIT : NO
GPS : YES
MAKE/MODEL : Magnavox MX4200
SELECTIVE AVAILABILITY : YES
P-CODE : NO
DIFFERENTIAL : NO
SAMPLE INTERVAL : 1 per sec
LOCATION OF ANTENNA
RELATIVE TO TRANSDUCER : antenna on flying bridge, roughly
80 m aft, 8 m to port
TIME OBTAINED RELATIVE TO
START/END OF ENSEMBLE : end
AVERAGING/EDITING APPLIED :
LOGGED WITH ADCP DATA : YES - user exit program
LOGGED INDEPENDENTLY : NO
COMMENTS :
OTHER :
ADCP DATA PROCESSING/EDITING
PERSONNEL IN CHARGE : E. Gottlieb
SOUND SPEED CORRECTIONS : applied using transducer temperature
DATE OF PROCESSING : 1993-95
NOTABLE SCATTERING LAYERS : almost every trip a vertically migrating
scattering layer is observed just off
the shelf break
COMMENTS :
CALIBRATION
GYROCOMPASS CORRECTION : YES - from bottom tracking
WATER TRACK METHOD : NO - ship never stops during trip
BOTTOM TRACK METHOD : YES
AMOUNT OF TIME AVAILABLE : about 6 hours/trip (=about 12.5%)
TOTAL No. CALIBRATION PTS: one/trip (after reducing residuals)
TIME VARIANT :
VELOCITY DEPENDENT : MAYBE - has not yet been observed
HEADING DEPENDENT : YES - depending on outbound (heading
about 135 deg. T) or inbound (about 315)
OUTBOUND INBOUND
NUMBER OF TRIPS : 21 19
AMPLITUDE MIN : 1.001 1.001
AMPLITUDE MEAN : 1.014 1.044
AMPLITUDE MAX : 1.047 1.230
AMPLITUDE STD : 0.012 0.055
PHASE MIN : -1.61 0.21
PHASE MEAN : -1.36 0.56
PHASE MAX : -0.74 1.05
PHASE STD : 0.21 0.19
FINAL SELECTION AMPLITUDE : 1.0 1.0
FINAL SELECTION PHASE : -1.4 0.6
AGREEMENT WITH PREVIOUS
CRUISES : see statistics above
COMMENTS : Bottom tracking is done for about
six hours each trip (while traversing
the shelf), and after reducing residuals
a single value of amplitude and phase
is obtained for each trip. Statistics
are done for all available trips (see
above) and the final selection values
(assumed constant over the entire trip)
have been used to correct all trips.
For calibration method prior to
93/4/16 see SHIP HEADING .
NAVIGATION CALCULATION
NAVIGATION USED : gps
REFERENCE LAYER DEPTH RANGE : bins 5 - 15
FILTERING METHOD FOR
SMOOTHING REFERENCE LAYER
VELOCITY (FORM/WIDTH) : Blackman window, half-width = 0.5 hour
FINALIZED SHIP VEL/POSITIONS
STORED IN DATABASE : YES
COMMENTS :
QUALITY ASSESSMENT
ON-STATION VS. UNDERWAY : All data underway, no stations. Quality
ranges from excellent to poor depending
on load and sea state.
VECTOR, CONTOUR, STICK PLOTS: excellent to poor
COMMENTS : Data quality is dependent upon load
and sea state, most likely due to
signal attenuation by a bubble layer
under the hull (the hull bottom is
perfectly flat). For a quiet seas
outbound trips are of excellent quality
and inbound are fair; for very heavy
seas most data are poor. For moderate
seas overall quality ranges from good
to marginal.
REFERENCES (DATA REPORTS,ETC) :
Gottlieb, Rossby, Schwartze, Cornillon, and Flagg (1994). The Oleander
Project First-Year Results: Gulf Stream ADCP Measurements from
October 1992 to October 1993. Proceedings from the Atlantic
Climate Change Program meeting, May 1994, Princeton, NJ. ed.
Anne-Marie Wilburn.
Gottlieb, Rossby, Schwartze, and Flagg (1995). The Oleander Project:
Measuring the Gulf Stream using and ADCP mounted on a Volunteer
Observing Ship. Proceedings from the Atlantic Climate Change
Program meeting, May 1995, Miami, Florida. ed. Anne-Marie Wilburn.
(both available upon request from Anne-Marie Wilburn, AOML/NOAA,
4301 Rickenbacker Cswy, Miami, FL 33149 -or- wilburn@aoml.erl.gov)
time
depth
meters
down
40.00000000000000
120.0000000000000
time
minutes since 1980-1-1 0:0:0
6311520
6838499
Decimal Day
days relative to 1992-1-1 0:0:0
303.9544200000000
393.8301600000000
WOCE date
yyyymmdd UTC
19921030
19930128
WOCE time of day
hhmmss.dd UTC
0.000000000000000
235959.1200000000
longitude
degrees_E
-74.06560000000000
-64.57150000000000
-180.0000000000000
180.0000000000000
nominally GPS
99999.0000
%9.4f
f9.4
latitude
degrees_N
32.21560000000000
40.64730000000000
-90.00000000000000
90.00000000000000
nominally GPS
99999.0000
%8.4f
f8.4
ADCP transducer temperature
degrees C
3.600000000000000
26.30000000000000
99999.0000
nominally thermistor
0.000000000000000
40.00000000000000
%4.1f
f4.1
transducer temperature (standard deviation)
degrees C
0.000000000000000
2.830000000000000
99999.0000
nominally thermistor
0.000000000000000
40.00000000000000
%5.2f
f5.2
eastward ship speed (hourly mean)
meters per second
-7.200000000000000
7.000000000000000
99999.0000
optimized position based on ADCP and GPS
-15.00000000000000
15.00000000000000
%5.1f
f5.1
eastward ship speed (standard deviation)
meters per second
0.000000000000000
2.660000000000000
99999.0000
optimized position based on ADCP and GPS
0.000000000000000
15.00000000000000
%5.2f
f5.2
northward ship speed (hourly mean)
meters per second
-7.700000000000000
7.500000000000000
99999.0000
optimized position based on ADCP and GPS
-15.00000000000000
15.00000000000000
%5.1f
f5.1
northward ship speed (standard deviation)
meters per second
0.000000000000000
0.000000000000000
99999.0000
optimized position based on ADCP and GPS
0.000000000000000
15.00000000000000
%5.2f
f5.2
eastward absolute current velocity (hourly mean)
meters per second
-1.589000000000000
4.099000000000000
99999.0000
ADCP/GPS
-9.900000000000000
9.900000000000000
%6.3f
f6.3
northward absolute current velocity (hourly mean)
meters per second
-4.030000000000000
1.926000000000000
99999.0000
ADCP/GPS
-9.900000000000000
9.900000000000000
%6.3f
f6.3