US JGOFS Antarctic Environments Southern Ocean Process Study (AESOPS)

Palmer Leg 96-04; Sept. 1996

John M. Morrison -- 29 January 1998

This "readme" file pertains to the CTD data taken
during RV N. B. Palmer cruise NBP9604 in September 1996.
Dr. Robert Anderson of the Lamont Dougherty Observatory was the 
chief scientist during this leg (boba@ldeo.columbia.edu). 

This cruise was the first AESOPS Leg, and
its main purpose was to do site surveys for the emplacement of
moorings, but a few hydrocasts were taken in March-April 1996.

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CTD Calibration:

On this cruise, one CTD configurations was used.  The processing
and calibration information for this configuration is given
below.

The casts made with the Trace Metal Clean Rosette makde on this leg are not
reported here because this system was not designed to produce CTD data of
"WOCE" quality.  The CTD system on this rosette was not capable of the
precision obtained from the system on the hydrographic rosette. 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 calibration information for all of the CTD
casts made with the Primary CTD system for cruise NBP9604.

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SEA-BIRD Processing Information:  Example 96400301.CNV

* Sea-Bird SBE 9 Raw Data File:
* FileName = G:\96400301.DAT
* Software Version 4.218
* Temperature SN = 2168
* Conductivity SN = 1799
* Number of Bytes Per Scan = 30
* Number of Voltage Words = 4
* System UpLoad Time = Sep 08 1996 03:48:21
* NMEA Latitude = 62 0.15 S
* NMEA Longitude = 170  0.16 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 = 3074                        
# 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 = oxML/L: oxygen [ml/l]
# name 6 = xmiss: transmissometer
# name 7 = flC: fluorometer, chelsea
# name 8 = par: irradiance (PAR)
# name 9 = stLs6000: sea tech ls6000 [mg/l]
# name 10 = svC: sound velocity, chen millero [m/s]
# name 11 = depS: depth, salt water [m]
# name 12 = potemp068: potential temperature, pri, IPTS-68 [deg C]
# name 13 = sigma-t00: density, sigma-t [kg/m^3], T0, C0
# name 14 = sigma-00: density, sigma-theta [kg/m^3], T0, C0
# name 15 = sal00: salinity, PSS-78 [PSU], T0, C0
# name 16 = sal11: salinity, PSS-78 [PSU], T1, C1
# name 17 = svC: sound velocity, chen millero [m/s]
# name 18 = flag:  0.000e+00
# span 0 = -1.7795, 2.2476              
# span 1 = 26.687466, 31.002371         
# span 2 = 3.000, 3076.000 
# span 3 = -1.7770, 2.2478              
# span 4 = 24.809757, 9.671e+02         
# span 5 = 3.49608, 8.61498             
# span 6 = 90.07, 91.16                 
# span 7 = -4.032e-03, 1.042e-01        
# span 8 = 4.596e+01, 4.596e+01         
# span 9 = 2.862e-17, 2.862e-17         
# span 10 = 1439.27, 1503.65            
# span 11 = 2.971, 3024.456             
# span 12 = -1.7796, 2.2178             
# span 13 = 27.2318, 27.8196            
# span 14 = 27.2318, 27.8318            
# span 15 = 33.8334, 34.7333            
# span 16 = 27.2559, 99.0000            
# span 17 = 1439.27, 1503.65            
# span 18 = 0.000e+00, 0.000e+00        
# interval = decibars: 1                                
# start_time = Sep 08 1996 03:48:21
# bad_flag = -9.990e-29
# sensor 0 = Frequency  0  temperature, primary, 2168, 30-Jul-96
# sensor 1 = Frequency  1  conductivity, primary, 1799, 26-Jul-96, cpcor = -9.5700e-08
# sensor 2 = Frequency  2  pressure, 43528, 14-Jun-91
# sensor 3 = Frequency  3  temperature, secondary, 1237, 19-Jan-96
# sensor 4 = Frequency  4  conductivity, secondary, 0924, 26-Oct-96, cpcor = -9.5700e-08
# sensor 5 = Extrnl Volt  0  oxygen, current, 0243, 11-Oct-95
# sensor 6 = Extrnl Volt  1  oxygen, temperature, 0243, 11-Oct-95
# sensor 7 = Extrnl Volt  2  transmissometer, 157D, 23-Feb-96
# sensor 8 = Extrnl Volt  3  fluorometer, chelsea, 88/2050-93, 23-Feb-96
# sensor 9 = Extrnl Volt  4  irradiance (PAR), 7175, 24-Feb-95
# sensor 10 = Extrnl Volt  5  sea tech ls6000, 236, 12-14-94
# datcnv_date = Sep 13 1996 03:49:59, 4.218
# datcnv_in = 96400301.DAT CTD_24.CON
# datcnv_skipover = 0
# wildedit_date = Sep 13 1996 03:52:14, 4.218
# wildedit_in = 96400301.CNV
# wildedit_pass1_nstd = 2.0
# wildedit_pass2_nstd = 20.0
# wildedit_npoint = 100
# wildedit_vars = t068 c0mS/cm pr t168 c1mS/cm oxML/L xmiss flC par stLs6000 svC
# wildedit_excl_bad_scans = yes
# celltm_date = Sep 13 1996 03:53:00, 4.218
# celltm_in = 96400301.CNV
# celltm_alpha = 0.0300, 0.0000
# celltm_tau = 9.0000, 0.0000
# filter_date = Sep 13 1996 03:53:42, 4.218
# filter_in = 96400301.CNV
# filter_low_pass_tc_A = 0.150
# filter_low_pass_tc_B = 0.030
# filter_low_pass_A_vars = pr
# filter_low_pass_B_vars = c0mS/cm c1mS/cm
# loopedit_date = Sep 13 1996 03:55:14, 4.218
# loopedit_in = 96400301.CNV
# loopedit_minVelocity = 0.000          
# loopedit_excl_bad_scans = yes
# binavg_date = Sep 13 1996 03:56:17, 4.218
# binavg_in = 96400301.CNV
# binavg_bintype = Pressure Bins
# binavg_binsize = 1.00
# binavg_excl_bad_scans = yes
# binavg_downcast_only = no
# binavg_skipover = 0
# binavg_surface_bin = yes, min = 0.500, max = 0.500, value = 0.000
# derive_date = Sep 13 1996 03:57:03, 4.218
# derive_in = 96400301.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.  Subsets of these data were also    
used to see if there was any significant drift of the CTD sensors
during the cruise.  In this case none was observed.

Conductivity   STDEV=   0.002     MEAN=  -0.005
Salinity       STDEV=   0.003     MEAN=  -0.006

Therefore, a correction of .005 was applied to the CTD conductivities.

The reported Conductivities and Salinities are good to +/- .003.

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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.

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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