EP3-94-MB NOAA Ship Malcolm Baldrige Rodman, Panama - San Diego August 4 - 27, 1994 Chief Scientist: L. Mangum Survey Department: CST Sweeney, Lamire, Zaragoza CTD Personnel: L. Mangum Final Processing: M. Swapp and K. McTaggart ACQUISITION: A total of 26 CTD casts were taken along 95W and 110W during leg 1 of the fall EPOCS cruise using PMEL Neil Brown CTD s/n 1114 and 12-bottle rosette sampling package. The majority of casts were to a depth of 1000 meters. Typically 12 bottles were fired on each cast and salinity samples were taken for calibration checks of the NBIS CTD. Survey department personnel under the supervision of Linda Mangum were responsible for preparing the CTD, all data acquisition, collection of water samples, and analyzing the samples for salinity using the ship's Autosal. The CTD data were acquired using the ship's LOGGER software. Audio backups were made on VCR tapes. Raw CTD data were transferred from the acquisition microVAX to the processing microVAX where PMEL programs reduced the data for analysis. Final calibrations were determined at PMEL after the cruise. Cast 11 was aborted because the printouts showed the rosette firing bottles during the downcast. CONDUCTIVITY CALIBRATIONS: CALIB.DAT precruise calibrations for PMEL CTD 1114: 1114 6 380 -0.13418 0.9992288 0.398032E-7 0.143853E-10 P DN S/N 1114 JUL 94 -0.82380 0.9979059 0.523471E-6 -0.285092E-10 P UP S/N 1114 JUL 94 -0.00301 1.0001160 0.000000E-6 0.000000E-10 T 68 S/N 1114 JUL 94 -0.00558 1.0001040 0.000000E-6 0.000000E-10 C S/N 1112 JUL 94 Post-cruise, files were restored to the VAX computer system at PMEL from Exabyte 8mm tapes. The .CAL file was created on the ship using CALDSK which takes the CTD values from those written on the cast logs during acquisition and not from the READER listings. The .CAL file was proofed, typos corrected, and put into the latest format compatible with WOCE modified programs at the lab. LINCALW.FOR, CALMSTRW.FOR, CALMCONW.PPC, and CALMDEEPW.PPC were used to find the best calibrations to apply to this data set. Final calibrations applied were from an overall fit of all bottles (casts 1 and 2 collected no samples owing to a rosette error): A0 = -0.5760980E-03 A1 = 0.9977739E+00 max residual = -0.0254 std error = 0.0102 (6/197 discarded in 3 reps) CONDUCTIVITY CALIBRATION PROGRAMS & PPLUS COMMAND FILES: CALDSKW - creates .CAL uncalibrated data file on SCS system CALMSTRW - inputs .CAL uncalibrated data file - outputs .CLB calibrated data file (from .COM), and .SEA calibrated WOCE data file (edit quality bytes) LINCALW - inputs .CAL uncalibrated data file (may be broken into groups), applies a linear fit to the data and throws out any points greater than 2.8 times the standard deviation, iterates through the program until no points are thrown out outputs .COEF file containing linear fit coefficients and .LOG file of fit iterations CALMCONW.PPC - reads .CLB calibrated bottle data file and makes five separate scatter plots: P, T, C, S, and cast number vs. delta-C (CTD-bottle). These are examined for cast breaks and drifts in the CTD. CALMDEEPW.PPC - reads .CLB calibrated bottle data file and makes two separate scatter plots: CTD salinity and bottle salinity vs. potential temperature from theta=0.6 to 2.2 C. DEEPCTD.PPC - reads .CTD EPIC pointer file and .BOT EPIC pointer file of deep casts only and overplots the bottle salinity data and CTD salintiy trace from theta=.8 to 2.4 C for each deep cast. PROCESSING: Raw data files were restored from Exabyte 8mm tapes to the VAX at PMEL. Standard processing programs for the Baldrige with default parameters were used to reduce these data. Post-cruise calibrations included 1) an overall linear fit applied to all casts. 2) Salinity offsets were determined using deep (i.e. 1000 db) theta-S plots and applied using program EPCTDW_OFF: if (ncast.eq.001) soffset = 0.025 if (ncast.eq.002) soffset = 0.025 if (ncast.eq.003) soffset = 0.025 if (ncast.eq.004) soffset = -.015 if (ncast.eq.006) soffset = 0.024 if (ncast.eq.007) soffset = 0.024 if (ncast.eq.009) soffset = 0.008 if (ncast.eq.010) soffset = 0.008 if (ncast.eq.012) soffset = 0.002 if (ncast.eq.013) soffset = -.021 if (ncast.eq.014) soffset = -.021 if (ncast.eq.015) soffset = 0.016 if (ncast.eq.016) soffset = 0.025 if (ncast.eq.017) soffset = -.025 if (ncast.eq.018) soffset = -.010 if (ncast.eq.019) soffset = 0.005 if (ncast.eq.020) soffset = 0.029 if (ncast.eq.021) soffset = 0.005 if (ncast.eq.022) soffset = 0.003 if (ncast.eq.023) soffset = 0.012 if (ncast.eq.024) soffset = -.020 if (ncast.eq.026) soffset = 0.010 DATA(3,L)=SAL78(C/42.914,DATA(2,L),DATA(1,L),0) data(3,l)=data(3,l) + soffset Cruise bottle data were compared to and fell within historical bottle data for each line. 3) As a check of the final calibrations, salinity profiles were overplotted line by line. Final CTD and bottle files were moved to DISK$HAYES and included in the RIM data management tables on December 18, 1995. DPDNB - inputs EG&G .EDT raw data file - outputs .DPZ binary file including computed fall rates and .RECZ ASCII file to choose downcast record range from DLAGB - inputs .DPZ binary file, applies precruise calibrations from CALIB.DAT, edits data for window outliers (according to WINDOW.DAT) and first differencing outliers, fills gaps by linear interpolation, lags conductivity, edits data exceeding fall rate criteria (according to .INP created by DLAGAVZ.COM; default minimum fall rate acceptable is .8 db/60 scans (25 meters per minute) and pressure interval of 1.5 db; doesn't fill these gaps), computes 1-meter averages, and applies cell dependence to final conductivity values - outputs CTDERR.DAT file of outlier flags, interpolated values, and fall rate criteria failures, and an ASCII .CTD data file including computed salinity EPCTDW - inputs .CTD calibrated P, T, OXC, OXT, and raw conductivity; applies any additional P and T cals (in EPCTDW_SHIP.COM), corrects raw C for cell factor, and applies C cals from EPCTDW_SHIP.COM; computes salinity; deals with oxygen if there was a sensor; option to eliminate 1-point spikes according to the gradients hardwired into the source code NOT used by default; omits any values for manual despiking; fills by linear interpolation for a value to exist every whole meter; recomputes C from S; and calculates other EPIC variables. - outputs final .CTD data file in EPIC format, and a .LOG file listing editted and filled data points EPICBOMSTRW - inputs .CLB calibrated bottle data file and .CTD EPIC data files (for header information) - outputs .BOT bottle data files in EPIC format TSPLTEP.PPC - reads .CTD EPIC pointer file and .BOT EPIC pointer file and overplots full water column bottle salinity and CTD trace as well as sigma-t lines (from SIGMAT.DAT). Use TSPLTB.PPC to include oxygen data. TEXTNOX - inputs .CTD EPIC pointer file and constructs PPLUS subcommand files - outputs TXT*.PPC files containing %label commands for table listings for each cast 3PLTNOX.PPC - reads TXT*.PPC subcommand files and .CTD EPIC pointer file and overplots vertical profiles of temperature, salinity, and sigma-t vs. pressure to 1000 db on left- hand side of page; and lists data in table form on right-hand side of page. Use 4PLT1DB.PPC to include oxygen data.