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. ------------------------------------------------------------------------ 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. --------------------------------------------------------------------------- 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-é00: 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* ---------------------------------------------------------------- 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. ------------------------------------------------------------------------- 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