NODC DOCUMENTATION FOR CTD DATASETS #documentation_file_name: w0105.csr.txt #nodc_accession_number: * #nodc_reference_number: * #nodc_documentation_date: * #nodc_documentor: * #distribution_restriction: none #date_received: * #submission_medium: ftp tar file #submittor_name: Robert O'Malley #submittor_institution: College of Oceanic and Atmosperic Sciences Oregon State University #submitter_street_address: 104 Ocean Admin Bldg #submitter_city: Corvallis #submitter_state: Oregon #submitter_country: USA #submitter_zip_code: 97331-5503 #sumitter_telephone_no: 541-737-2180 #submitter_internet: * #submitter_email: omalley@coas.oregonstate.edu #collection_information: (i.e cruise dates, ports, cast numbers, time of cast, longitude and latitude of casts) Wecoma cruise W0105C 23 May to 13 June, 2001 Newport, Oregon to Newport, Oregon Seasoar sampling in 15 tows as follows: Tow Start date,time End date,time Parameters measured (2001) (UT) (2001) (UT) 1 24 May 0232 24 May 1925 P,T1,C1,T2,C2,PAR,FL1,FL2,FLSCN,--- 2 24 May 2227 26 May 0828 P,T1,C1,T2,C2,PAR,FL1,FL2,FLSCN,--- 3 26 May 1841 27 May 0445 P,T1,C1,T2,C2,PAR,FL1,FL2,FLSCN,--- 4 27 May 1611 28 May 0304 P,T1,C1,T2,C2,PAR,FL1,FL2,FLSCN,--- 5 28 May 0827 28 May 1513 P,T1,C1,T2,C2,PAR,FL1,FL2,FLSCN,--- 5a 28 May 1554 28 May 2118 P,T1,C1,T2,C2,PAR,FL1,FL2,FLSCN,--- 5b 28 May 2209 29 May 0457 P,T1,C1,T2,C2,PAR,FL1,FL2,FLSCN,--- 6 29 May 1312 29 May 1902 P,T1,C1,T2,C2,PAR,FL1,FL2,FLSCN,--- 7 29 May 2306 01 Jun 1248 P,T1,C1,T2,C2,PAR,FL1,FL2,FLSCN,--- 8 02 Jun 1522 02 Jun 1954 P,T1,C1,T2,C2,PAR,FL1,FL2,FLSCN,--- 9 02 Jun 2159 04 Jun 2140 P,T1,C1,T2,C2,PAR,FL1,FL2,FLSCN,--- 10 05 Jun 0324 06 Jun 1435 P,T1,C1,T2,C2,PAR,FL1,FL2,FLSCN,--- 11 07 Jun 0522 09 Jun 0836 P,T1,C1,T2,C2,PAR,FL1,FL2,FLSCN,--- 12 09 Jun 0912 09 Jun 2054 P,T1,C1,T2,C2,PAR,FL1,FL2,FLSCN,--- 13 11 Jun 0355 11 Jun 1912 P,T1,C1,T2,C2,PAR,---,---,-----,FL3 14 11 Jun 2109 12 Jun 1724 P,T1,C1,T2,C2,PAR,---,---,-----,FL3 15 12 Jun 1759 13 Jun 0633 P,T1,C1,T2,C2,PAR,---,---,-----,FL3 Bounding boxes (NSWE) for each mappng survey: Tow no. Mapping N S W E 1,2 BB1 45.3 N 43.7 N 125.4 W 124.0 W 3 SBN1 45.2 N 44.9 N 124.5 W 124.0 W 4 SBN2 45.2 N 44.9 N 124.5 W 124.0 W 5,5a,5b SBS1 44.5 N 44.1 N 125.2 W 124.1 W 6 SBN3 45.2 N 45.0 N 124.5 W 124.0 W 7 BB2 45.3 N 43.7 N 125.4 W 124.0 W 8,9 BB3 45.3 N 44.4 N 124.9 W 124.0 W 9 BF1 45.3 N 44.8 N 124.5 W 124.0 W 9 BF2 45.3 N 44.8 N 124.5 W 124.0 W 9,10 BF3 45.3 N 44.8 N 124.5 W 124.0 W 10 BF4 45.3 N 44.8 N 124.5 W 124.0 W 10 BF5 45.3 N 44.8 N 124.5 W 124.0 W 10 BF6 45.3 N 44.8 N 124.5 W 124.0 W 11 BF7 45.3 N 44.8 N 124.5 W 124.0 W 11,12 BB4 45.3 N 43.7 N 125.4 W 124.0 W 13-15 BB5 45.3 N 43.7 N 125.4 W 124.0 W Maximum sampling depth generaly 115 m or less for all tows. #principal_investigator_name: John A. Barth #pi_institution: College of Oceanic and Atmosperic Sciences Oregon State University #pi_street-address: 104 Ocean Admin Bldg #pi_city: Corvallis #pi_state: Oregon #pi_country: USA #pi_zip_code: 97331-5503 #pi_telephone_no: 541-737-1607 #pi_internet: * #pi_email: barth@coas.oregonstate.edu #project: Coast Ocean Advances in Shelf Transport (COAST) Survey I #funding agency: NSF #grant/contract-no: OCE-9907854 #platform_type: research vessel #platform_name: Wecoma #collection_methods: (i.e. how were the data obtained) SeaBird 9/11 plus CTD inside Seasoar vehicle; with dual ducted SBE-3 and SBE-4 temperature and conductivity sensors inside seasoar vehicle; flow through sensor duct pumped by SBE-5 pumps; intake and outlet for each sensor pair was directed forward through center of lower nose with intake and outlet separated by about 2 cm, the T1-C1 pair were starboard of the centerline, and the T2-C2 pair were port of the centerline; final data were from the T-C pair indicated below; final data were from the following pairs of sensors: tow 1 preferred sensor pair: 1 tow 2 preferred sensor pair: 2 tow 3 preferred sensor pair: 2 tow 4 preferred sensor pair: 2 tow 5 preferred sensor pair: 2 tow 6 preferred sensor pair: 2 tow 7 preferred sensor pair: 2,1 tow 8 preferred sensor pair: 2 tow 9 preferred sensor pair: 2 tow 10 preferred sensor pair: 2 tow 11 preferred sensor pair: 1 tow 12 preferred sensor pair: 2 tow 13 preferred sensor pair: 1 tow 14 preferred sensor pair: 1 tow 15 preferred sensor pair: 1 for tow 1 - 15: preferred sensor pair 1: SN 2128 and 1738 for T and C preferred sensor pair 2: SN 2127 and 1737 for T and C #analysis_methods: (i.e. how were the data processed, calibrated etc) Calibrations from SeaBird Electronic, Inc. (SBE) were used for the temperature, conductivity and pressure sensors. Dates of SBE CTD #428 calibrations as follows: P:(SN 64256) 28 March 2001 T1:(SN 2128) 29 March 2001 T2:(SN 2127) 29 March 2001 C1:(SN 1738) 30 March 2001 C2:(SN 1737) 30 March 2001 Data Processing: We compute lagged correlations between the temperature and conductivity time series for each sensor pair. In order to calculate the correlation between T and C, we work with the first-differences of those time series. We then find the maximum cross correlation, along with the values on each side of it, and fit a parabola to those three points. The maximum of the parabola gives the fractional scan offset to be used in shifting the conductivity time series to match up with the temperature time series. This is done for every up- and down- trace profile of seasoar data. The time series of up-trace lags and the time series of down-trace lags were then individualy cleaned by statistical methods. Each lag value is examined with its time series to see if it falls within three standard deviations of the mean of a centered, 101-point window. Those outside three sigma of the mean are then replaced with the window's average value, in an iterative process. To correct the 24-Hz conductivity data for the thermal mass of the conductivity cell, we allowed both the amplitude (alpha) and time constant (tau) of the thermal mass correction to be functions of the lag between T and C. These variable alpha and tau values can be obtained by minimizing the area in T-S space of selected test hours for each tow. These values then represent the optimal thermal mass correction for each tow. If the data were too noisy, or the tow too short, then the thermal mass values optimizations from the closest useful tow were used. Using the above method, the thermal mass variable alpha and tau can be calculated as functions of lag as: alpha = alpha.slope * lag + alpha.offset tau = tau.slope * lag**0.5 + tau.offset the slopes and offsets can be summarized for each tow as follows: sensor [--- alpha ---] [--- tau ---] tow pair slope offset slope offset 1 1 0.000345 0.01079 1.369 7.184 2 2 0.004768 0.01027 1.341 7.151 3 2 0.000000 0.01665 1.338 7.151 4 2 0.000000 0.01792 1.340 7.152 5 2 0.003198 0.01236 1.338 7.149 6 2 0.000000 0.01764 1.342 7.143 7 2 0.002999 0.00195 1.334 7.134 7 2 0.000345 0.01694 1.340 7.150 8 2 0.000000 0.01770 1.338 7.147 (values from tow 9) 9 2 0.000000 0.01770 1.338 7.147 10 2 0.000000 0.01662 1.340 7.152 11 1 0.001883 0.01503 1.343 7.153 12 2 0.002180 0.01348 1.340 7.151 13 1 0.000345 0.01385 1.340 7.150 14 1 0.004521 0.01113 1.340 7.150 15 1 0.014626 0.00035 1.339 7.149 The corrected and realigned 24-Hz temperature and conductivity data are used to calculate 24-Hz salinity, and these are averaged to yield one- second averages stored in hourly files. The two FlashPak fluorometers were run with different optical filters; the first (FPK010) with a green filter (lamda = 490 +/- 30 nm), the second (FPK016) with a violet filter (lamda = 440 +/- 30 nm). The FPAK data sample water that is pumped in series between them, and as such are offset in time from the rest of the SeaSoar data. This offset has been corrected for in the final data set. Conversion from the 0-5 volt output to chlorophyll-a can be done with the following calibration equations: CHL010 (ug/L) = FPK010 (V) * 18.1324 - 4.5122 CHL016 (ug/L) = FPK016 (V) * 7.9615 - 1.7665 FPK016 was chosen as the fpak to use to derive chlorophyll Successive hourly files of the reprocessed one-second average data were joined to yield a single data file for each tow of the survey. The single file for each tow was then broken into the different component lines. #instruments: tow 1-12: SBE 9/11 plus CTD SN 0428 with: SBE pressure sensor SN 64256 SBE temperature sensors SN 2128 and SN 2127 SBE conductivity sensors SN 1738 and SN 1737 WetLABS AC9 SN 152 WetLABS FPAK SN 010 WetLABS FPAK SN 016 SeaPoint Fluorometer, tuned to fluoroscein PAR tow 13-15: SBE 9/11 plus CTD SN 0428 with: SBE pressure sensor SN 64256 SBE temperature sensors SN 2128 and SN 2127 SBE conductivity sensors SN 1738 and SN 1737 PAR ISUS dissolved iron detector WetStar Fluorometer #publications: "SeaSoar Observation During the Coastal Ocean Advances in Shelf Transport (COAST) Survey I, W0105C, 23 May - 13 June 2001" by R. O'Malley et al., Data Report 191, Reference 2003-1, August 2003 #associated_datasets: CTD data from W0105C #associated_versions: * #data_set_information: * #data_set_name: * #data_set_volume: 165,622 kbytes (1,271,664 records) #source_computer: Sun Sparc Ultra 10 #source_computer_operating_system: Sun OS 5.6 #source_language: Fortran, C #computer_code: ASCII #originator_dataset_identifier: W0105C #data_dates: 23 May - 13 June 2001 #left_geographic_upper_bound: 126W 46N #right_geographic_lower_bound: 124W 43N #geographic_region: Northeast Pacific #data_type: SEASOAR data #sphere: * #parameters: col 1: latitude (decimal degrees) col 2: longitude (decimal degrees) col 3: pressure (dbars) col 4: temperature (C) col 5: salinity (psu) col 6: Sigma-t (kg/cubic meter) col 7: potential temperature (C) col 8: sigma-theta (kg/cubic meter) col 9: time (decimal year-day of 2000) col 10: date and time (integral year, month, day, hour, minute, second) col 11: flag col 12: PAR (0-5 volts) col 13: FPK010 (volts) (green filter) col 14: FPK016 (volts) (violet filter) col 15: WetStar (volts) col 16: fluoroscein fluorometer (volts) col 17: chlorophyl-a (micro g/liter) (violet filter) #format_description: (e.g. description of the header, data, record layouts. Include units, scales, resolution, accuracy) no header; each line contains: unfiltered GPS latitude unfiltered GPS longitude pressure (dbars), accurate to better than plus/minus 2 db temperature (C), accurate to plus/minus 0.01 C salinity (psu), accurate to plus/minus 0.01 psu sigma-t (kg/cubic meter), potential temperature (C), sigmat-theta (kg/cubic meter), decimal year-day (of 2001), integral year, month, day, hour, minute, second flag word (see format comments below for interpretation) PAR (volts), accurate to 0.001 volts fluorescence (volts), accurate to 0.001 fluorescence (volts), accurate to 0.001 WetStar (volts), accurate to 0.001 volts fluoroscein fluorescence (volts), accurate to 0.001 chlorophyll-a (micro g/liter), accurate to 0.01 The FORTRAN format for each record is: format (f10.5,f11.5,f6.1,5f8.4,f10.5,1x,6i2.2,1x,i4.4,5f6.3,f6.2) "no data" values are indicated by 9-filling: temperature, salinity, sigma-t, potential temerature, or sigma-theta all use 99.9999 to indicate "no data" present for that record; flourescence uses 9.999 to indicate "no data" chlorophyll uses 99.99 to indicate "no data" #format_publication: * #format_comments: (any information about the format that will be useful, but is not elsewhere on this form) The variable at the end of each line (the flag word) indicates different items: the ones place: 0 indicates use of sensor pair 1 (T1, C1) 1 indicates use of sensor pair 2 (T2, C2) the tens place: 0 indicates gps fix for location 1 indicates linear interpolation between gps fixes the hundreds place: 2 indicates top or bottom of seasoar cycle 0 indicates otherwise the thousands place: 1 indicates collection of water sample from the 5-m intake 0 indicates otherwise The files all have the extension of ".dat2c". All data are identified by their maps (big box maps: BB1, BB2, BB3, BB4, BB5; small box north maps: SBN1, SBN2, SBN3; small box south maps: SBS1; and butterly maps: BF1, BF2, BF3, BF4, BF5, BF6, BF7) and are separated into their E-W lines (line1 through line8 for the big box maps; lineA through lineF for the small box maps; and line W_E for the butterfly maps) or are identified as connecting lines (eg: bb1.line1_2.dat2c goes from the end of line1 to the start of line2 for the BB1 map). Repeat coverage of the same line on the same map is given a decimal number (eg: bb4.line8.1.dat2c and bb4.line8.2.dat2c). #misc_documentation: * #submittor_documentation: * any textual information about the data, provided by the submitter, or investigator, (not NODC folks) For example, in most cases this has been an ASCII text file accompanying the data on a DAT , diskette, or CDROM. It may contain information which is redundant with other parts of this form. * leave blank