US JGOFS Antarctic Environments Southern Ocean Process Study (AESOPS)
Revelle Leg KIWI08, 8 Jan. - 8 Feb. 1998; APFZ Survey 2
John M. Morrison
17 December 1998
This "readme" file pertains to the CTD data taken during R/V Roger Revelle Cruise
KIWI08, 8 January - 8 February 1998.
Dr. Kenneth H. Coale of the Moss Landing Marine Laboratories (coale@mlml.calstate.edu)
was the chief scientist during this leg. This cruise was the second survey leg on the
R/V Roger Revelle during the U.S. JGOFS program in the Southern Ocean (AESOPS).
The Revelle legs focused on the Polar Front region and complemented several AESOPS
cruises on board the R/V Nathaniel Palmer which focused on the Ross Sea.
Several casts were also made with a trace metal clean rosette equipped with a SeaCat CTD
on this leg. These data were calibrated separately as this system was not designed to
produce hydrographic data of "WOCE quality". These trace metal rosette data have been
submitted to the U.S. JGOFS data base as a separate files.
CTD Calibration:
This is the setup, processing and calibation information for the
primary CTD for cruise RR08.
A single calibration is applied to all of the stations for
salinity (conductivity) and dissolved oxygen, respectively (see below)
As can be seen in the SEA-BIRD Processing Information below, the CTD
package was outfitted with: dual temperature and salinity sensors,
Chelsea Fluorometer, Sea Tech Transmissometer, Biospherical QSP200L PAR
(both surface and underwater sensors, Sea-Tech LS6000 Backscatter sensor,
and Beckman Dissolved Oxygen. This file only refers to the calibration
of the primary CTD salinity and oxygen sensors. The remainder of the sensors
are to be calibrated by others and data from additional sensors will be
added to the files as they become available.
Problems:
a. Bad oxygen data on R0800704.cnf between 32 - 80 db removed.
b. Bad oxygen data on R0800804.cnf between 64 - 70 db, 74 - 82 db
and 98 - 100 db removed
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SEA-BIRD Processing Information: Example R0800101.cnf
* Sea-Bird SBE 9 Raw Data File:
* FileName = G:\R0800101.DAT
* Software Version 4.227
* Temperature SN = 1712
* Conductivity SN = 1908
* Number of Bytes Per Scan = 33
* Number of Voltage Words = 5
* System UpLoad Time = Jan 10 1998 22:56:26
* NMEA Latitude = 53 0.00 S
* NMEA Longitude = 175 32.99 W
* NMEA UTC (Time) = 22:56:25
* Store Lat/Lon Data = Add to Header Only
* Command Line = seasave -c24_ctd -d600m -l
** Ship: R/V Roger Revelle
** Cruisenumber: KIWI08-RR
** Cruisename: JGOFS S.O. Survey 2
# nquan = 12
# nvalues = 83343
# units = metric
# name 0 = t068: temperature, pri, IPTS-68 [deg C]
# name 1 = c0mS/cm: conductivity, primary [mS/cm]
# name 2 = pr: pressure [db]
# name 3 = t168: temperature, sec, IPTS-68 [deg C]
# name 4 = c1mS/cm: conductivity, secondary [mS/cm]
# name 5 = oxC: oxygen, current [æA]
# name 6 = oxT: oxygen, temperature [deg C]
# name 7 = flC: fluorometer, chelsea
# name 8 = xmiss: transmissometer
# name 9 = par: irradiance (PAR)
# name 10 = stLs6000: sea tech ls6000 [mg/l]
# name 11 = flag: 0.000e+00
# span 0 = -99.0000, 99.0000
# span 1 = -3.903493, 1.106e+03
# span 2 = -32694.087, 99999.000
# span 3 = -99.0000, 99.0000
# span 4 = -4.024290, 1.070e+03
# span 5 = -0.00000, 1.21990
# span 6 = -6.84160, 38.41290
# span 7 = -9.597e-03, 3.982e+00
# span 8 = 8.681e-17, 100.08
# span 9 = 4.100e+00, 9.999e+03
# span 10 = 2.862e-17, 33.00000
# span 11 = 0.000e+00, 0.000e+00
# interval = seconds: 0.0416667
# start_time = Jan 10 1998 22:56:26
# bad_flag = -9.990e-29
# sensor 0 = Frequency 0 temperature, primary, 1712, 11-DEC-97/SEA-BIRD
# sensor 1 = Frequency 1 conductivity, primary, 1908, 12-Dec-97, cpcor =
-9.5700e-08
# sensor 2 = Frequency 2 pressure, 69008, 01-Sept-97/ODF
# sensor 3 = Frequency 3 temperature, secondary, 2309, 01-Sep-97/ODF
# sensor 4 = Frequency 4 conductivity, secondary, 1472, 09-Sep-97s, cpcor =
-9.5700e-08
# sensor 5 = Extrnl Volt 0 fluorometer, chelsea, 88190, 7-16-97
# sensor 6 = Extrnl Volt 1 transmissometer, T1006D, 7-31-97
# sensor 7 = Extrnl Volt 2 irradiance (PAR), 4506, 9-03-97
# sensor 8 = Extrnl Volt 3 sea tech ls6000, 347, 5-09-97
# sensor 9 = Extrnl Volt 5 altimeter
# sensor 10 = Extrnl Volt 6 oxygen, current, 130475, 26-Aug-97
# sensor 11 = Extrnl Volt 7 oxygen, temperature, 130475, 26-Aug-97
# sensor 12 = Extrnl Volt 9 surface irradiance (SPAR), degrees = 0.0
# datcnv_date = Jan 22 1998 09:24:32, 4.227
# datcnv_in = R0800101.DAT 24_CTD.CON
# datcnv_skipover = 0
# alignctd_date = Jan 22 1998 09:26:21, 4.227
# alignctd_in = R0800101.CNV
# alignctd_cond_advSecs = 0.000, 0.000
# alignctd_temp_advSecs = 0.000, 0.000
# alignctd_oxygen_current_advSecs = 2.000, 0.000
# alignctd_oxygen_temp_advSecs = 2.000, 0.000
# alignctd_wetstar_advSecs = 0.000
# wildedit_date = Jan 22 1998 09:28:22, 4.227
# wildedit_in = R0800101.CNV
# wildedit_pass1_nstd = 2.0
# wildedit_pass2_nstd = 20.0
# wildedit_npoint = 10
# wildedit_vars = t068 c0mS/cm pr t168 c1mS/cm oxC oxT flC xmiss par stLs6000
# wildedit_excl_bad_scans = yes
# celltm_date = Jan 22 1998 09:30:24, 4.227
# celltm_in = R0800101.CNV
# celltm_alpha = 0.0300, 0.0300
# celltm_tau = 7.0000, 7.0000
# celltm_temp_sensor_use_for_cond = primary, secondary
# filter_date = Jan 22 1998 09:32:26, 4.227
# filter_in = R0800101.CNV
# filter_low_pass_tc_A = 0.150
# filter_low_pass_tc_B = 2.000
# filter_low_pass_A_vars = pr
# filter_low_pass_B_vars =
# file_type = ascii
*END*
----------------------------------------------------
----------------------------------------------------
Stations used for CTD conductivity(salinity)
and oxygen calibrations:
/aesops/REVELLE/R08/CTD/R0800101.cnf
/aesops/REVELLE/R08/CTD/R0800202.cnf
/aesops/REVELLE/R08/CTD/R0800302.cnf
/aesops/REVELLE/R08/CTD/R0800303.cnf
/aesops/REVELLE/R08/CTD/R0800403.cnf
/aesops/REVELLE/R08/CTD/R0800404.cnf
/aesops/REVELLE/R08/CTD/R0800502.cnf
/aesops/REVELLE/R08/CTD/R0800503.cnf
/aesops/REVELLE/R08/CTD/R0800506.cnf
/aesops/REVELLE/R08/CTD/R0800603.cnf
/aesops/REVELLE/R08/CTD/R0800604.cnf
/aesops/REVELLE/R08/CTD/R0800703.cnf
/aesops/REVELLE/R08/CTD/R0800704.cnf
/aesops/REVELLE/R08/CTD/R0800802.cnf
/aesops/REVELLE/R08/CTD/R0800803.cnf
/aesops/REVELLE/R08/CTD/R0800804.cnf
Conductivity Sensor 1908:
To correct the CTD conductivities the
following correction is used:
Cor Sal = Obs Sal - Sal Cor
Sal Cor = 0.0041390674 - 2.0537450e-06 * (CTD Observed Press)
Standard Deviation of Correction = 0.002
The reported Conductivities and Salinities are good to +/- .002
---------------------------------------------
---------------------------------------------
CTD O2 Calibration:
Oxygen Sensor
To correct CTD-O2 the following equation is used:
Corrected CTD-O2 = Uncorrected CTD-O2 - O2 Cor
O2 Cor = -1.1103834e-05 - 8.5838170e-05 * (CTD Observed Press)
+ 3.7388831e-08 * (CTD Observed Press)**2
Standard Deviation of Correction = 0.01
Therefore, the CTD-O2 is good to approximately +/- 0.01 ml/l.
The raw data files may be requested from:
DR.JOHN M. MORRISON
NORTH CAROLINA STATE UNIVERSITY
DEPARTMENT OF MARINE, EARTH AND ATMOSPHERIC SCIENCES
JORDAN HALL RM. 1125
BOX 8208
RALEIGH, NC 27695-8208
Phone: 919-515-7449
Fax: 919-515-7802
Email: John_Morrison@ncsu.edu