US JGOFS Antarctic Environments Southern Ocean Process Study (AESOPS)
Palmer Leg 98-02; Feb. - Mar. 1998; Benthic and Mooring Recovery Cruise
John M. Morrison
26 August 1998
This "readme" file pertains to the CTD data taken
during RV N. B. Palmer cruise NBP9802 from 24 Febuary-3 April 1998.
Dr. Susumo Honjo (shonjo@whoi.edu) of the Woods Hole
Oceanographic Institution was the chief scientist during this
leg.
This cruise was the last AESOPS Leg, and its main purpose
was to recover the JGOFS sediment trap and optical array
moorings, and to collect additional data at the mooring sites.
CTD Calibration:
On this cruise, one CTD configuration was used. A conductivity
sensor failed on station 98200901, but the secondary set of
sensors worked with failure for the entire cruise. Therefore,
to keep the data internally consistent the data from the secondary
set of sensors was process and is reported here. The processing
and calibration information for this configuration is given below:
It was determined that the CTD dissolved oxygen sensor did not produce reliable
data on this cruise. The CTD transmissometer, fluorometer, light scattering
and PAR measurements are currently being calibrated by other investigators.
This is the setup, processing and calibation information for the
setup of the CTD for cruise NBP9802
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SEA-BIRD Processing Information: Example 98200101.CNV
* Sea-Bird SBE 9 Raw Data File:
* FileName = G:\98200101.DAT
* Software Version 4.218
* Temperature SN = 2367
* Conductivity SN = 2069
* Number of Bytes Per Scan = 30
* Number of Voltage Words = 4
* System UpLoad Time = Feb 26 1998 13:40:21
* NMEA Latitude = 76 30.10 S
* NMEA Longitude = 177 57.20 W
* NMEA UpLoad Time = not available
* Store Lat/Lon Data = Add to Header Only
** Ship: R/V Nathaniel B. Palmer
** Cruise: JGOFS Southern Ocean
# nquan = 19
# nvalues = 578
# units = metric
# name 0 = scan: scan number
# name 1 = t068: temperature, pri, IPTS-68 [deg C]
# name 2 = t168: temperature, sec, IPTS-68 [deg C]
# name 3 = pr: pressure [db]
# name 4 = c0mS/cm: conductivity, primary [mS/cm]
# name 5 = c1mS/cm: conductivity, secondary [mS/cm]
# name 6 = xmiss: transmissometer
# name 7 = stLs6000: sea tech ls6000 [mg/l]
# name 8 = par: irradiance (PAR)
# name 9 = oxML/L: oxygen [ml/l]
# name 10 = flC: fluorometer, chelsea
# name 11 = depS: depth, salt water [m]
# name 12 = potemp068: potential temperature, pri, IPTS-68 [deg C]
# name 13 = sal00: salinity, PSS-78 [PSU], T0, C0
# name 14 = gpa: geopotential anomaly
# name 15 = dm: dynamic meters
# name 16 = sigma-é00: density, sigma-theta [kg/m^3], T0, C0
# name 17 = sigma-t00: density, sigma-t [kg/m^3], T0, C0
# name 18 = flag: 0.000e+00
# span 0 = 531, 41438
# span 1 = -1.9977, -0.4479
# span 2 = -1.9989, -0.4492
# span 3 = 3.000, 580.000
# span 4 = 26.622547, 28.439993
# span 5 = 26.623171, 28.442720
# span 6 = 82.45, 90.70
# span 7 = 0.80612, 4.35743
# span 8 = 1.990e+00, 1.990e+00
# span 9 = 5.71171, 8.62460
# span 10 = 3.294e-03, 2.218e+00
# span 11 = 2.969, 573.134
# span 12 = -2.0094, -0.4590
# span 13 = 33.7989, 34.7398
# span 14 = 0.000, 2.195
# span 15 = 0.0000, 0.2195
# span 16 = 27.2052, 27.9731
# span 17 = 27.2052, 27.9727
# span 18 = 0.000e+00, 0.000e+00
# interval = decibars: 1
# start_time = Feb 26 1998 13:40:21
# bad_flag = -9.990e-29
# sensor 0 = Frequency 0 temperature, primary, 2367, 19 nov 97 s
# sensor 1 = Frequency 1 conductivity, primary, 2069, 18 Nov 97s, cpcor = -9.5700e-08
# sensor 2 = Frequency 2 pressure, 53980, 23-Oct-97
# sensor 3 = Frequency 3 temperature, secondary, 2438, 18 nov 97s
# sensor 4 = Frequency 4 conductivity, secondary, 2067, 18 nov 97s, cpcor = -9.5700e-08
# sensor 5 = Extrnl Volt 0 oxygen, current, 130491, 21 November 1997
# sensor 6 = Extrnl Volt 1 oxygen, temperature, 130491, 21 November 1997
# sensor 7 = Extrnl Volt 2 transmissometer, 157D, 6/4/97
# sensor 8 = Extrnl Volt 3 fluorometer, chelsea, 088080, 29-Apr-97
# sensor 9 = Extrnl Volt 4 sea tech ls6000, 326, 05-17-96
# sensor 10 = Extrnl Volt 5 irradiance (PAR), 4471, 10/01/96
# datcnv_date = Feb 26 1998 15:53:51, 4.218
# datcnv_in = 98200101.DAT CTD_24.CON
# datcnv_skipover = 0
# wildedit_date = Feb 26 1998 15:54:54, 4.218
# wildedit_in = 98200101.CNV
# wildedit_pass1_nstd = 2.0
# wildedit_pass2_nstd = 20.0
# wildedit_npoint = 100
# wildedit_vars = scan t068 t168 pr c0mS/cm c1mS/cm xmiss stLs6000 par oxML/L flC
# wildedit_excl_bad_scans = yes
# celltm_date = Feb 26 1998 15:55:30, 4.218
# celltm_in = 98200101.CNV
# celltm_alpha = 0.0300, 0.0000
# celltm_tau = 7.0000, 0.0000
# filter_date = Feb 26 1998 15:56:01, 4.218
# filter_in = 98200101.CNV
# filter_low_pass_tc_A = 0.030
# filter_low_pass_tc_B = 0.150
# filter_low_pass_A_vars = c0mS/cm c1mS/cm
# filter_low_pass_B_vars = pr
# loopedit_date = Feb 26 1998 15:57:13, 4.218
# loopedit_in = 98200101.CNV
# loopedit_minVelocity = 0.250
# loopedit_excl_bad_scans = yes
# binavg_date = Feb 26 1998 15:58:01, 4.218
# binavg_in = 98200101.CNV
# binavg_bintype = Pressure Bins
# binavg_binsize = 1.00
# binavg_excl_bad_scans = yes
# binavg_downcast_only = yes
# binavg_skipover = 0
# binavg_surface_bin = yes, min = 0.300, max = 0.500, value = 0.000
# derive_date = Feb 26 1998 15:58:23, 4.218
# derive_in = 98200101.CNV CTD_24.CON
# file_type = ascii
*END*
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Calibration:
Calibration for Conductivity and Salinity:
The CTD Conductivity sensor was calibrated by correlating the CTD
downcast conductivities with the conductivities of the water samples
taken with the SEA-BIRD carousel on the upcast. The mean and
standard deviations of these differences using all of the available
bottle data are given below.
/aesops/NBP9802/FINAL_DATA/98200101.cnf
/aesops/NBP9802/FINAL_DATA/98200102.cnf
/aesops/NBP9802/FINAL_DATA/98200201.cnf
/aesops/NBP9802/FINAL_DATA/98200202.cnf
/aesops/NBP9802/FINAL_DATA/98200301.cnf
/aesops/NBP9802/FINAL_DATA/98200302.cnf
/aesops/NBP9802/FINAL_DATA/98200501.cnf
/aesops/NBP9802/FINAL_DATA/98200502.cnf
/aesops/NBP9802/FINAL_DATA/98200503.cnf
/aesops/NBP9802/FINAL_DATA/98200701.cnf
/aesops/NBP9802/FINAL_DATA/98200702.cnf
/aesops/NBP9802/FINAL_DATA/98200901.cnf
/aesops/NBP9802/FINAL_DATA/98200902.cnf
/aesops/NBP9802/FINAL_DATA/98201001.cnf
/aesops/NBP9802/FINAL_DATA/98201002.cnf
/aesops/NBP9802/FINAL_DATA/98201101.cnf
MINIMUM PRESSURE USED = 0 db
Conductivity STDEV= 0.002 MEAN= -0.005
Salinity STDEV= 0.002 MEAN= -0.006
Therefore, a correction of .005 was applied to the CTD conductivities.
The reported Conductivities and Salinities are good to +/- .002.
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The Digital dissolved oxygen sensor did not provide reliable data
during this cruise. The CTD transmissometer, fluorometer, light
scattering and PAR measurements are currently being calibrated by
other investigators.
-------------------------------------------------------------------
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
EMAIL: John_Morrison@NCSU.EDU
PHONE: 919-515-7449
FAX: 919-515-7802