US JGOFS Antarctic Environments Southern Ocean Process Study (AESOPS)
Palmer Leg 97-03; Apr. - May 1997; Process 3
John M. Morrison
26 August 1998
US JGOFS Antarctic Environments Southern Ocean Process Study (AESOPS)
NBP9703: Ross Sea Process 3:
This "readme" file pertains to the CTD data taken on the
TRACE METAL ROSETTE during RV N. B. Palmer cruise NBP9703 from
31 March - 12 May 1997. Dr. Hugh Ducklow of the Virginia Institute
of Marine Sciences (duck@vims.edu) was the chief scientist during this leg.
This cruise was the third process study leg of the U.S. JGOFS program
in the Southern Ocean (AESOPS).
TRACE METAL ROSETTE CTD Calibration:
On this cruise, one CTD configuration was used. The processing
and calibration information for this configuration is given below:
This is the setup, processing and calibation information for the
setup of the CTD on the TRACE METAL ROSETTE for cruise NBP9703.
The casts made with the Trace Metal Clean Rosette make on this leg are
reported here. These data were collected using a SeaBird SEACAT CTD and
therefore are not "WOCE" caliber data. The conductivity data have
been calibrated using the same techniques as used in calibration of
the Primary CTD system.
In addition, there was a PAR sensor mounted on this CTD. The PAR data
are listed here for completion and have been calibrated using the
factory calibration information (no in-situ calibration data were
collected).
Note: The standard JGOFS CTD numbering scheme was not followed for this
cruise. The scheme used was 97300101 --- CCCSSScc where CCC is the
cruise designation, SSS is the station designation beginning with station 300,
and cc is the cast number. The station designation should have started with
station 000 and not 300. All of the original data collected aboard ship
use this scheme, but the data in the JGOFS database have been changed to
the standard numbering scheme and start with station 000, cast 01.
This is the setup, processing and calibration information for all of the CTD
casts made with the Primary CTD system for cruise NBP9703.
BAD Casts /aesops/NBP9703/FINAL_DATA/ANC/97300301.anc_tm
/aesops/NBP9703/FINAL_DATA/ANC/97300604.anc_tm
Cast /aesops/NBP9703/FINAL_DATA/ANC/97300301.anc_tm has bad conductivity
within the upper 100m.
---------------------------------------------------------------------------
SEA-BIRD Processing Information: Example 97300101.CNV
* Sea-Bird SBE 19 Data File:
* FileName = G:\97300101.HEX
* Software Version 4.218
* Temperature SN = 2216
* Conductivity SN = 2216
* System UpLoad Time = Apr 09 1997 21:41:02
** Ship: R/V Nathaniel B. Palmer
** Cruise: JGOFS Southern Ocean
# nquan = 12
# nvalues = 197
# units = metric
# name 0 = t068: temperature, IPTS-68 [deg C]
# name 1 = c0mS/cm: conductivity [mS/cm]
# name 2 = pr: pressure [db]
# name 3 = par: irradiance (PAR)
# name 4 = scan: scan number
# name 5 = timeS: time [s]
# name 6 = sal00: salinity, PSS-78 [PSU]
# name 7 = depS: depth, salt water [m]
# name 8 = sigma-t00: density, sigma-t [kg/m^3]
# name 9 = sigma-é00: density, sigma-theta [kg/m^3]
# name 10 = potemp068: potential temperature, IPTS-68 [deg C]
# name 11 = flag: 0.000e+00
# span 0 = -1.6475, 1.3027
# span 1 = 26.940868, 29.983101
# span 2 = 6.612, 207.635
# span 3 = 1.252e-02, 8.915e+01
# span 4 = 246, 1416
# span 5 = 122.500, 707.250
# span 6 = 33.7903, 34.6507
# span 7 = 6.549, 205.558
# span 8 = 27.1873, 27.7456
# span 9 = 27.1874, 27.7462
# span 10 = -1.6490, 1.2928
# span 11 = 0.000e+00, 0.000e+00
# interval = decibars: 1
# start_time = Apr 09 1997 21:41:02
# bad_flag = -9.990e-29
# sensor 0 = Frequency 0 temperature, 2216, 06-Jun-96s
# sensor 1 = Frequency 1 conductivity, 2216, 06-Jun-96s, cpcor = -9.5700e-08
# sensor 2 = Extrnl Volt 0 irradiance (PAR), UWQ, May 21, 1996
# sensor 3 = Pressure Voltage, 178053, 06 June 1996
# datcnv_date = Apr 09 1997 22:37:18, 4.218
# datcnv_in = 97300101.HEX TM.CON
# datcnv_skipover = 0
# filter_date = Apr 09 1997 22:37:22, 4.218
# filter_in = 97300101.CNV
# filter_low_pass_tc_A = 0.500
# filter_low_pass_tc_B = 2.000
# filter_low_pass_A_vars = c0mS/cm
# filter_low_pass_B_vars = pr
# alignctd_date = Apr 09 1997 22:37:26, 4.218
# alignctd_in = 97300101.CNV
# alignctd_cond_advSecs = 0.000, 0.000
# alignctd_temp_advSecs = 0.500, 0.000
# alignctd_oxygen_current_advSecs = 0.000, 0.000
# alignctd_oxygen_temp_advSecs = 0.000, 0.000
# loopedit_date = Apr 09 1997 22:37:29, 4.218
# loopedit_in = 97300101.CNV
# loopedit_minVelocity = 0.250
# loopedit_excl_bad_scans = yes
# binavg_date = Apr 09 1997 22:37:32, 4.218
# binavg_in = 97300101.CNV
# binavg_bintype = Pressure Bins (No Interpolation)
# binavg_binsize = 1.00
# binavg_excl_bad_scans = yes
# binavg_downcast_only = no
# binavg_skipover = 0
# binavg_surface_bin = yes, min = 2.000, max = 0.500, value = 0.000
# derive_date = Apr 09 1997 22:37:35, 4.218
# derive_in = 97300101.CNV TM.CON
# file_type = ascii
*END*
----------------------------------------------------------------
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 TRACE METAL ROSETTE on the upcast. The mean and
standard deviations of these differences using all of the available
bottle data are given below.
/aesops/NBP9703/FINAL_DATA/ANC/97300101.anc_tm
/aesops/NBP9703/FINAL_DATA/ANC/97300201.anc_tm
/aesops/NBP9703/FINAL_DATA/ANC/97300303.anc_tm
/aesops/NBP9703/FINAL_DATA/ANC/97300404.anc_tm
/aesops/NBP9703/FINAL_DATA/ANC/97300410.anc_tm
/aesops/NBP9703/FINAL_DATA/ANC/97300503.anc_tm
/aesops/NBP9703/FINAL_DATA/ANC/97300505.anc_tm
/aesops/NBP9703/FINAL_DATA/ANC/97300507.anc_tm
/aesops/NBP9703/FINAL_DATA/ANC/97300510.anc_tm
/aesops/NBP9703/FINAL_DATA/ANC/97300601.anc_tm
/aesops/NBP9703/FINAL_DATA/ANC/97300702.anc_tm
/aesops/NBP9703/FINAL_DATA/ANC/97300703.anc_tm
/aesops/NBP9703/FINAL_DATA/ANC/97300706.anc_tm
/aesops/NBP9703/FINAL_DATA/ANC/97300708.anc_tm
/aesops/NBP9703/FINAL_DATA/ANC/97300709.anc_tm
/aesops/NBP9703/FINAL_DATA/ANC/97300802.anc_tm
/aesops/NBP9703/FINAL_DATA/ANC/97300902.anc_tm
/aesops/NBP9703/FINAL_DATA/ANC/97301001.anc_tm
/aesops/NBP9703/FINAL_DATA/ANC/97301005.anc_tm
/aesops/NBP9703/FINAL_DATA/ANC/97301007.anc_tm
MINIMUM PRESSURE USED = 0 db
Conductivity STDEV= 0.01 MEAN= -0.03
Salinity STDEV= 0.01 MEAN= -0.04
Therefore, a correction of .03 was applied to the CTD conductivities.
The reported Conductivities and Salinities are good to +/- .01.
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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