US JGOFS Antarctic Environments Southern Ocean Process Study (AESOPS)
Revelle Leg KIWI07, Dec. 1997 - Jan. 1998; APFZ Process 1
John M. Morrison
14 December 1998
This "readme" file pertains to the CTD data taken during R/V Roger Revelle Cruise
KIWI07, 1 December 1997 - 3 January 1998.
Dr. Richard T. Barber of the Duke University Marine Lab (rbarber@duke.edu)
was the chief scientist during this leg. His cruise was the first process 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.
There was no Trace Metal Rosette CTD system on this cruise.
CTD Calibration:
This is the setup, processing and calibation information for the
primary CTD for cruise RR07.
There was a significant drift in the conductivity sensors
on this CTD for this cruise, therefore the cruise was divided
into 2 subsets of stations which were calibrated separately 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. The primary CTD sensors began to become noisy on this cruise. The
CTD was swapped out for station R0701803.cnf. No bottle salinity data
were collected for this station, therefore it could not be calibrated.
The uncalibrated data for R0701803.cnf is included with this dataset for
completeness, but the user should be beware if they try to use this
data in conjunction with the remainder of the dataset.
---------------------------------------------------------------------------
SEA-BIRD Processing Information: Example R0700001.cnf
* Sea-Bird SBE 9 Raw Data File:
* FileName = G:\RO700001.DAT
* Software Version 4.227
* Temperature SN = 2380
* Conductivity SN = 1880
* Number of Bytes Per Scan = 33
* Number of Voltage Words = 5
* System UpLoad Time = Dec 03 1997 17:31:39
* NMEA Latitude = 50 9.85 S
* NMEA Longitude = 178 39.34 W
* NMEA UTC (Time) = 17:31:37
* Store Lat/Lon Data = Add to Header Only
* Command Line = seasave -c24_ctd -d600m -l
** Ship: R/V Roger Revelle
** Cruisenumber: KIWI07-RR
** Cruisename: JGOFS S.O. Process 1
# nquan = 20
# nvalues = 1199
# 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 = sal00: salinity, PSS-78 [PSU], T0, C0
# name 12 = sal11: salinity, PSS-78 [PSU], T1, C1
# name 13 = depS: depth, salt water [m]
# name 14 = potemp068: potential temperature, pri, IPTS-68 [deg C]
# name 15 = sigma-é00: density, sigma-theta [kg/m^3], T0, C0
# name 16 = sigma-t00: density, sigma-t [kg/m^3], T0, C0
# name 17 = oxML/L: oxygen [ml/l]
# name 18 = svC: sound velocity, chen millero [m/s]
# name 19 = flag: 0.000e+00
# span 0 = 3.4817, 7.1752
# span 1 = 31.766808, 34.698116
# span 2 = 4.000, 603.000
# span 3 = 3.4817, 7.1753
# span 4 = 31.766331, 34.698608
# span 5 = 0.31034, 0.54685
# span 6 = 3.25902, 6.64089
# span 7 = 1.652e-02, 6.807e-02
# span 8 = 8.65, 92.24
# span 9 = 4.100e+00, 1.389e+02
# span 10 = 0.42917, 2.62932
# span 11 = 34.1604, 34.2869
# span 12 = 34.1602, 34.2864
# span 13 = 3.966, 596.952
# span 14 = 3.4405, 7.1738
# span 15 = 26.7427, 27.2732
# span 16 = 26.7426, 27.2693
# span 17 = 5.01883, 6.76665
# span 18 = 1473.41, 1478.93
# span 19 = 0.000e+00, 0.000e+00
# interval = decibars: 1
# start_time = Dec 03 1997 17:31:39
# bad_flag = -9.990e-29
# sensor 0 = Frequency 0 temperature, primary, 2380, 01-Aug-97/ODF
# sensor 1 = Frequency 1 conductivity, primary, 1880, 09-Sep-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 6 oxygen, current, 130475, 26-Aug-97
# sensor 10 = Extrnl Volt 7 oxygen, temperature, 130475, 26-Aug-97
# sensor 11 = Extrnl Volt 9 surface irradiance (SPAR), degrees = 0.0
# datcnv_date = Dec 03 1997 18:12:05, 4.227
# datcnv_in = RO700001.DAT 24_CTD.CON
# datcnv_skipover = 0
# alignctd_date = Dec 03 1997 18:13:22, 4.227
# alignctd_in = RO700001.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 = Dec 03 1997 18:14:41, 4.227
# wildedit_in = RO700001.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 = Dec 03 1997 18:16:00, 4.227
# celltm_in = RO700001.CNV
# celltm_alpha = 0.0300, 0.0300
# celltm_tau = 7.0000, 7.0000
# celltm_temp_sensor_use_for_cond = primary, secondary
# filter_date = Dec 03 1997 18:17:19, 4.227
# filter_in = RO700001.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 =
# loopedit_date = Dec 03 1997 18:19:52, 4.227
# loopedit_in = RO700001.CNV
# loopedit_minVelocity = 0.100
# loopedit_excl_bad_scans = yes
# derive_date = Dec 03 1997 18:21:16, 4.227
# derive_in = RO700001.CNV 24_CTD.CON
# derive_time_window_docdt = seconds: 2
# binavg_date = Dec 03 1997 18:23:27, 4.227
# binavg_in = RO700001.CNV
# binavg_bintype = Pressure Bins
# binavg_binsize = 1.00
# binavg_excl_bad_scans = yes
# binavg_downcast_only = no
# binavg_skipover = 0
# binavg_surface_bin = no, min = 0.000, max = 0.000, value = 0.000
# file_type = ascii
*END*
----------------------------------------------------
----------------------------------------------------
CTD Calibration: (subset a)
----------------------------------------------------
CTD Conductivity Sensor 1880
/aesops/REVELLE/R07/CTD/R0700101.LAC
/aesops/REVELLE/R07/CTD/R0700103.LAC
/aesops/REVELLE/R07/CTD/R0700104.LAC
/aesops/REVELLE/R07/CTD/R0700105.LAC
/aesops/REVELLE/R07/CTD/R0700108.LAC
/aesops/REVELLE/R07/CTD/R0700201.LAC
/aesops/REVELLE/R07/CTD/R0700207.LAC
/aesops/REVELLE/R07/CTD/R0700208.LAC
/aesops/REVELLE/R07/CTD/R0700209.LAC
/aesops/REVELLE/R07/CTD/R0700301.LAC
/aesops/REVELLE/R07/CTD/R0700401.LAC
/aesops/REVELLE/R07/CTD/R0700402.LAC
/aesops/REVELLE/R07/CTD/R0700403.LAC
/aesops/REVELLE/R07/CTD/R0700404.LAC
/aesops/REVELLE/R07/CTD/R0700406.LAC
/aesops/REVELLE/R07/CTD/R0700408.LAC
/aesops/REVELLE/R07/CTD/R0700409.LAC
/aesops/REVELLE/R07/CTD/R0700410.LAC
/aesops/REVELLE/R07/CTD/R0700411.LAC
/aesops/REVELLE/R07/CTD/R0700501.LAC
/aesops/REVELLE/R07/CTD/R0700506.LAC
/aesops/REVELLE/R07/CTD/R0700508.LAC
/aesops/REVELLE/R07/CTD/R0700510.LAC
/aesops/REVELLE/R07/CTD/R0700601.LAC
/aesops/REVELLE/R07/CTD/R0700605.LAC
/aesops/REVELLE/R07/CTD/R0700608.LAC
/aesops/REVELLE/R07/CTD/R0700610.LAC
/aesops/REVELLE/R07/CTD/R0700611.LAC
/aesops/REVELLE/R07/CTD/R0700612.LAC
/aesops/REVELLE/R07/CTD/R0700613.LAC
------------------------------------------------
Conductivity Calibration:
Conductivity Sensor 1908:
To correct the CTD conductivities the
following correction is used:
Cor Sal = Obs Sal - Sal Cor
Conductivity STDEV= 0.002 MEAN= -0.002
Salinity STDEV= 0.002 MEAN= -0.002
Therefore, a correction of .002 was applied to the shipboard
Conductivities and Salinities.
The reported Conductivities and Salinities are good to +/- .002.
---------------------------------------------
---------------------------------------------
CTD O2 Calibration:
Oxygen Sensor 130475:
To correct CTD-O2 the following equation is used:
Corrected CTD-O2 = Uncorrected CTD-O2 - O2 Cor
There was a break in the calibration curve at approximately
150 m, so different calibrations are applied to the
upper 150 meters and from 150 m to the bottom:
Calibration: 0 to 150 m
O2 Cor = -0.37752616 + 0.0052209199 * (CTD Observed Press)
- 2.5324527e-05 * (CTD Observed Press)**2
Standard Deviation of Correction = 0.1
Calibration: 150 - Bottom
O2 Cor = -0.00035680458 - 0.00012373568 * (CTD Observed Press)
+ 4.1177958e-08 * (CTD Observed Press)**2
Standard Deviation of Correction = 0.01
Therefore, the CTD-O2 is good to approximately +/- 0.1 ml/l
in the upper 150 m and good to approximately +/- 0.01 ml/l for
the remainder of the water column. Note: There was a lot of
scatter in the CTD-O2 and observed O2 data in the
upper 150 m do to high O2 gradients at these depths, therefore
the CTD-O@ may actually be better than this in the upper 150 m.
--------------------------------------------------
--------------------------------------------------
CTD Calibration: (subset b)
--------------------------------------------------
CTD Conductivity Sensor 1880
/aesops/REVELLE/R07/CTD/R0700701.LAC
/aesops/REVELLE/R07/CTD/R0700704.LAC
/aesops/REVELLE/R07/CTD/R0700707.LAC
/aesops/REVELLE/R07/CTD/R0700708.LAC
/aesops/REVELLE/R07/CTD/R0700801.LAC
/aesops/REVELLE/R07/CTD/R0700803.LAC
/aesops/REVELLE/R07/CTD/R0700806.LAC
/aesops/REVELLE/R07/CTD/R0700901.LAC
/aesops/REVELLE/R07/CTD/R0700907.LAC
/aesops/REVELLE/R07/CTD/R0700908.LAC
/aesops/REVELLE/R07/CTD/R0700909.LAC
/aesops/REVELLE/R07/CTD/R0700910.LAC
/aesops/REVELLE/R07/CTD/R0700912.LAC
/aesops/REVELLE/R07/CTD/R0700913.LAC
/aesops/REVELLE/R07/CTD/R0701002.LAC
/aesops/REVELLE/R07/CTD/R0701005.LAC
/aesops/REVELLE/R07/CTD/R0701008.LAC
/aesops/REVELLE/R07/CTD/R0701010.LAC
/aesops/REVELLE/R07/CTD/R0701101.LAC
/aesops/REVELLE/R07/CTD/R0701201.LAC
/aesops/REVELLE/R07/CTD/R0701301.LAC
/aesops/REVELLE/R07/CTD/R0701401.LAC
/aesops/REVELLE/R07/CTD/R0701501.LAC
/aesops/REVELLE/R07/CTD/R0701601.LAC
/aesops/REVELLE/R07/CTD/R0701705.LAC
/aesops/REVELLE/R07/CTD/R0701709.LAC
/aesops/REVELLE/R07/CTD/R0701801.LAC
/aesops/REVELLE/R07/CTD/R0701804.LAC
/aesops/REVELLE/R07/CTD/R0701808.LAC
/aesops/REVELLE/R07/CTD/R0701901.LAC
/aesops/REVELLE/R07/CTD/R0701902.LAC
/aesops/REVELLE/R07/CTD/R0701904.LAC
------------------------------------------------
Conductivity Calibration:
Conductivity Sensor 1908:
To correct the CTD conductivities the
following correction is used:
Cor Sal = Obs Sal - Sal Cor
Conductivity STDEV= 0.002 MEAN= -0.004
Salinity STDEV= 0.002 MEAN= -0.005
Therefore, a correction of .002 was applied to the shipboard
Conductivities and Salinities.
The reported Conductivities and Salinities are good to +/- .002.
---------------------------------------------
---------------------------------------------
CTD O2 Calibration:
Oxygen Sensor 130475:
To correct CTD-O2 the following equation is used:
Corrected CTD-O2 = Uncorrected CTD-O2 - O2 Cor
There was a break in the calibration curve at approximately
150 m, so different calibrations are applied to the
upper 150 meters and from 150 m to the bottom:
Calibration: 0 to 150 m
O2 Cor = -0.26363052 + 0.00054072770 * (CTD Observed Press)
+ 4.1270712e-06 * (CTD Observed Press)**2
Standard Deviation of Correction = 0.1
Calibration: 150 - Bottom
O2 Cor = -0.00062310291 - 0.00010265712 * (CTD Observed Press)
+ 3.0871048e-08 * (CTD Observed Press)**2
Standard Deviation of Correction = 0.01
Therefore, the CTD-O2 is good to approximately +/- 0.1 ml/l
in the upper 150 m and good to approximately +/- 0.01 ml/l for
the remainder of the water column. Note: There was a lot of
scatter in the CTD-O2 and observed O2 data in the
upper 150 m do to high O2 gradients at these depths, therefore
the CTD-O2 may actually be better than this in the upper 150 m.
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