US JGOFS Antarctic Environments Southern Ocean Process Study (AESOPS) Palmer Leg 96-05; Nov. 1996; Mooring Deployment John M. Morrison 29 January 1998 This "readme" file pertains to the CTD data taken during RV N. B. Palmer cruise NBP9605 in November 1996. Dr. Jack Dymond of Oregon State University was the chief scientist during this leg (jdymond@oce.orst.edu). This cruise was the first mooring leg of the U.S. JGOFS program in the Southern Ocean (AESOPS). CTD Calibration: On this cruise, one CTD configuration was used. The processing and calibration information for this configuration is given below. This cruise was the third AESOPS Leg on the PALMER, and its main purpose was the emplacement of moorings, but a few CTD/hydrocasts were taken. The only hydrographic bottle data reported were salinity samples that were run on an Autosal salinometer under less than ideal temperature control conditions. After eliminating some questionable values, these bottle salinities appear to be accurate to about 0.004 or better. (For a complete description of the hydrographic data, please refer to the readme file of the hydrographic data that has been submitted by Dr. Louis Codispoti). Because of the uncertainty in the few salinity samples taken, the few number of CTD casts made on this cruise, and the fact that the CTD is exactly the same as used on the previous leg (NBP9604A), and the fact that the calibration for NBP9604A showed no significant drift during the previous cruise, it was decided to use the calibration for NBP9604A for these data. The remainder of the calibration information found below is from cruise NBP9604A. This is the setup, processing and calibration information for all of the CTD casts made with the Primary CTD system for cruise NBP9605. --------------------------------------------------------------------- SEA-BIRD Processing Information: Example 96410101.CNV * Sea-Bird SBE 9 Raw Data File: * FileName = G:\96410101.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 = Oct 08 1996 03:47:35 * NMEA Latitude = 63 27.58 S * NMEA Longitude = 170 34.87 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 = 2481 # 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 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 = -1.7554, 2.1887 # span 1 = 26.741508, 30.879623 # span 2 = 4.000, 2484.000 # span 3 = -1.7579, 2.1890 # span 4 = 26.740807, 30.880001 # span 5 = 2.89509, 6.41725 # span 6 = 89.06, 90.87 # span 7 = -4.262e-03, 3.030e-01 # span 8 = 4.596e+01, 4.596e+01 # span 9 = 0.50083, 1.61392 # span 10 = 1439.53, 1493.55 # span 11 = 3.961, 2445.455 # span 12 = -1.7556, 2.1667 # span 13 = 27.2654, 27.8197 # span 14 = 27.2654, 27.8295 # span 15 = 33.8759, 34.7330 # span 16 = 33.8768, 34.7343 # span 17 = 1439.53, 1493.55 # span 18 = 0.000e+00, 0.000e+00 # interval = decibars: 1 # start_time = Oct 08 1996 03:47:35 # 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, 2186, 30-Jul-96 # sensor 4 = Frequency 4 conductivity, secondary, 1798, 07-Aug-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 sea tech ls6000, 326, 05-17-96 # sensor 10 = Extrnl Volt 5 irradiance (PAR), 7175, 24-Feb-95 # datcnv_date = Oct 08 1996 05:51:04, 4.218 # datcnv_in = 96410101.DAT CTD_24.CON # datcnv_skipover = 0 # wildedit_date = Oct 08 1996 05:52:45, 4.218 # wildedit_in = 96410101.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 = Oct 08 1996 05:53:21, 4.218 # celltm_in = 96410101.CNV # celltm_alpha = 0.0300, 0.0000 # celltm_tau = 9.0000, 0.0000 # filter_date = Oct 08 1996 05:53:54, 4.218 # filter_in = 96410101.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 = Oct 08 1996 05:55:07, 4.218 # loopedit_in = 96410101.CNV # loopedit_minVelocity = 0.000 # loopedit_excl_bad_scans = yes # binavg_date = Oct 08 1996 05:55:57, 4.218 # binavg_in = 96410101.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 = Oct 08 1996 05:56:35, 4.218 # derive_in = 96410101.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. Only the salinities collected below 50 meters depth were used in this correlation. If the full range was used the mean remains the same, but the the STDEV becomes .003 as would be expected for the high-gradient, variable surface layers. 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. MINIMUM DEPTH USED = 50.0 Conductivity STDEV= 0.002 MEAN= -0.006 Salinity STDEV= 0.002 MEAN= -0.009 Therefore, a correction of .006 was applied to the CTD conductivities. The reported Conductivities and Salinities are good to +/- .002. ----------------------------------------------------------------- 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