LMG0302 - GLOBEC Cruise Data Report By Todd B. Johnson and Andy Nunn February 14, 2003 - March 7, 2003 Table of Contents INTRODUCTION 1 ARCHIVE DATA EXTRACTION 2 CD DIRECTORY STRUCTURE 3 DISTRIBUTION CONTENTS 4 ADCP 4 CALIBRATION 4 CTD 4 /CTD/raw 4 /CTD/process 4 CRUISE TRACK 5 ICE IMAGES 5 ISOBAR CHARTS 5 DATA AND SCIENCE REPORT 5 QC PLOTS 5 XBT 5 /XBT/ 5 SCIENCE AND MOORING DATA 5 JGOFS DATA SET 6 RVDAS 6 Meteorological and Light Data 6 Navigational Data 7 Geophysical Data 7 Oceanographic Data 7 DATA FILE NAMES AND STRUCTURES 8 LKNU 8 LMET 8 LTSG 9 LPCO 9 SVP1 9 LADC 9 LASH 10 LGYR 10 TGPS 11 LPCD 13 LMG SENSORS 15 SHIPBOARD SENSORS 15 CTD SENSORS 15 ACQUISITION AND PROCESSING INFORMATION 16 PROCESSING SPECIFICS 16 ERRORS AND EVENTS 16 Introduction The LMG data acquisition systems continuously log data from a suite of instrumentation throughout the cruise. This document describes the format of that data and its location on the distribution CDs. It also contains important information which may affect how this data is processed such as instrument failures or other known problems with acquisition. The data collected during this cruise is distributed on a CD-ROM written in ISO9660 level-1 format. This data format has very strict requirements on filenames and organization. However, it is readable by virtually every computing platform. All of the data has been archived with the Unix "tar" command and/or compressed using Unix "gzip" compression. Tar files have a ".tar" extension and Gzipped files have a ".gz" extension. Tools are available on all platforms for uncompressing and de-archiving these formats. On Macintosh, Stuffit Expander with DropStuff will open a tar archive and uncompress gzipped and Unix compressed files. For Windows9X, WinZip, a shareware utility included on this CD (remember, it is shareware) will open these files. In some cases to adhere to the ISO9660 format the .tar extension was removed. When we tarred the files then gzip the tar archive the name of the file became File.tar.gz. This name does not follow the 8.3 naming convention of the ISO9660 format. So the file was renamed without .tar making the file name File.gz. On Windows and Mac Platforms Winzip and Stuffit Expander handles this just fine. When they expand the File.gz the expanded file becomes File.tar, which both software packages can handle. On Unix platform gunzip expands File.gz but it does not append the .tar extension. So you may not recognize the file as a tar archive, but OS does recognize it as a tar archive. If you use the file command it will return saying it is a tar file. The below tar command will un-archive the file just fine. IMPORTANT: Read the last section in this document, Acquisition Problems and Events, for important information that may affect the processing of this data. Archive Data Extraction It is often useful to know exactly how an archive was produced when expanding its contents. Tar files were created using the following commands: tar cvf archive-file files-to-be-archived To create a list of the files in the archive: tar tvf archive-file > contents.list To extract the files from the archive: tar xvf archive-file file(s)-to-extract G-zipped files will have a ".gz" extension on the filename. These files can be decompressed after de-archiving, using: gunzip filename.gz CD Directory Structure /ADCP/ Pingdata/ Gentoo/ /CAL/ SVP_CALS.tar UW_CALS.tar CTD_CALS.zip MET_CALS.zip Instrument.coeff /CTD/ Raw/ Process/ /ICE_IMAGE/ *.jpg /ISOBARS/ *.gif /JGOF/ lmgjgof.tar /MAPS/ *.jpg *.ps Track.txt /MOORING/ Moor2003.zip /QC_PLOTS/ Lmgqc.tar /REPORT/ Report.doc Report.html Report.txt /RVDAS/ Lmguw.tar Lmgnav.tar /SCIENCE/ Report/ Met_Data/ /SITREPS/ *.txt /UTILITY/ Winzip Stuffit Expander /XBT/ *.EDF *.RDF Distribution Contents ADCP /Adcp/ The ADCP DAS data files are named pingdata.xxx (xxx representing a file number). Note that these extensions do NOT represent Julian day numbers. Please refer to the file's creation date. The ADCP DAS computer creates a new pingdata file when the current one reaches a size of 320K. The ping files logged on Gentoo, the Linux processing computer, however are created new each day. Some ADCP data is also transmitted to RVDAS. East and North vectors for ship's speed relative to the reference layer and ship's heading are archived in the navigational data section of RVDAS. Calibration /Cal/ The tar files in the Cal directory contain images of calibration sheets for each of the following systems: Sound Velocity Probe(SVP_CALS.TAR), Meteorological System(MET_CALS.TAR), Underway System(UW_CALS.TAR), and CTD(CTD_CALS.TAR). CTD diagrams can be found in the ctd Cal directory for voltage and frequency sensors. CTD /CTD/ The ctd data was collected and processed on a windows 98 computer, using Seasave Win32 - Version 5.25a and SBE Data Processing - Version 5.21. For more information and software visit the web site at www.seabird.com. /CTD/raw This directory contains the original .con, .dat, .bl, and .hdr files files produced for each CTD cast. /CTD/process Each processed cast is represented here by a set of ten files. Note that cast 1 was split into a separate data set for the up and down segments. Also, the DO2 sensor was only added onto to the instrument package for the 4th cast. In addition to the standard files listed below, an additional round of post processing was done to produce rg302EEE.cnv and .asc files containing non-bin averaged data and an ascii conversion of that data. g302EEE.con A copy of the configuration file for the cast. g302EEE.cnv The converted file for the whole cast. g302EEE.ros The rosette file that contains the scan lines for each bottle trip. g302EEE.btl The bottle file that contains the avg, standard deviation, min, and max for a select set of variables for each bottled fired during the upcast. dg302EEE.cnv The converted file for the down cast. dg302EEE.asc An ASCII formatted file for the down cast without a header. dg302EEE.hdr The header for the down cast. ug302EEE.cnv The converted file for the up cast. ug302EEE.asc An ASCII formatted file for the up cast without a header. ug302EEE.hdr The header for the up cast. Cruise Track /MAP/ PostScript cruise track plots have been produced for this cruise, in three sizes. It has also been converted to a jpeg format. The cruise track file track.txt is also included and contains the latitude and longitude in 10-minute intervals. Ice Images /ICE_IMAGE/ This directory contains .jpg files of Terrascan ice imagery sent to the ship from Palmer station before and during the cruise. Isobar Charts /Isobars/ This directory contains GIF image files. These file are an analysis of mean sea level pressure from the National Center for Environmental Prediction's Medium Range Forecast Model. They are updated every 6 hours. Naming the convention is as follows yyjjj.hh.gif where yy is the year, jjj is the day number, and hh is the hour. Data and Science Report /Report/ Copies of this report in MS Word, HTML, and text formats. QC Plots /QC_PLOTS/ Postscript files of data stored each day on RVDAS for quality control analysis during the cruise. There are 3 types of files, named metXXX.ps, navXXX.ps, and oceanXXX.ps, where XXX is represents the Julian day. Met files are a summary of the data from the meteorological instruments, Nav files are a summary of navigational data, and Ocean files are a summary of the underway seawater and bathymetry data. XBT /XBT/ Expendable Bathythermographic (XBT) probes were used to obtain water column temperature profiles. These XBT were launched at all SIO Mooring sites. The .RDF files contain the raw data, and the .EDF contained the exported ascii data. Science and Mooring Data /Science/ and /Moor2003/ These directories contain additional data provided by the PI to supplement the standard distribution data set. JGOFS Data Set /JGOF/ The JGOFS data set consists of a single file produced each day named jg.dat.gz where is the day the data was acquired. The ".gz" extension indicates that the individual files are compressed before archiving. The daily file consists of 22 separate columnar fields in text format, which are described below. The JGOFS data set is obtained primarily by applying calibrations to raw data and decimating to whole minute intervals. However, several fields are derived measurements from more than a single raw input. Note: Null, unused, or unknown fields are filled with 9's in the JGOFS data. Additionally, 3 separate QC plots are generated daily by the ET using the JGOFS data set. These plots include TSG and Bathymetry data, meteorological data, and navigation data. The files are called ocean.ps, met.ps, and nav.ps respectively. Field Data Units 01 GMT date dd/mm/yy 02 GMT time hh:mm:ss 03 PCOD latitude (negative is South) Ddd.dddd 04 PCOD longitude (negative is West) Ddd.dddd 05 Ships speed Knots 06 GPS HDOP - 07 Gyro Heading Degrees (azimuth) 08 Course over ground Degrees (azimuth) 09 Mast PAR ?Einsteins/meters2 sec 10 Sea surface temperature (C 11 Not used - 12 Sea surface salinity PSU 13 Sea depth (uncorrected, calc. sw sound vel. 1500 m/s) meters 14 True wind speed (port windbird) meters/sec 15 True wind direction (port windbird) degrees (azimuth) 16 Ambient air temperature (C 17 Relative humidity % 18 Barometric pressure mBars 19 Sea surface fluorometry volts (0-5 FSO) 20 Not used - 21 PSP W/m2 22 PIR W/m2 RVDAS /rvdas/ RVDAS (Research Vessel Data Acquisition System) was developed at Lamont-Doherty Earth Observatory of Columbia University and has been used on the R/V Maurice Ewing for several years. It was adapted for use on the Nathaniel B. Palmer and her sister ship, the R/V Laurence M. Gould. Below you will find detailed information on the data included. Be sure to read the "Significant Acquisition Events" section below for important information about data acquisition during this cruise. Meteorological and Light Data Measurement File ID Collect. Status Rate Instrument Air Temperature lmet continuous 1 sec R. M. young 41372VC Relative Humidity lmet continuous 1 sec R. M. young 41372VC Wind Speed/Direction lmet continuous 1 sec R. M. young 5106 PIR (LW radiation) lmet continuous 1 sec Eppley PIR PSP (SW radiation) lmet continuous 1 sec Eppley PSP Photosynthetically- Available Radiation lmet continuous 1 sec BSI QSR-240 Barometer lmet continuous 1 sec R. M. young 61201 Navigational Data Measurement File ID Collect. Status Rate Instrument Attitude GPS lash continuous 1 sec Ashtec ADU-2 P-Code GPS lpcd Not collected 1 sec Trimble 20636-00SM Gyro lgyr continuous 0.2 sec Anschutz Gyro Trimble GPS tgps continuous 1 sec NT200 Geophysical Data Measurement File ID Collect. Status Rate Instrument Bathymetry lknu variable Varies Knudsen 320B/R Oceanographic Data Measurement File ID Collect. Status Rate Instrument Salinity ltsg continuous 15 sec SeaBird 21 Sea S Temperature ltsg continuous 15 sec SeaBird 3-01/S Fluorometry (analog) ltsg continuous 15 sec Turner 10-AU-005 ADCP ladc continuous 1 sec RD Instruments Data File Names and Structures RVDAS data is divided into two broad categories, Underway and Navigation. The groups are abbreviated "uw" and "nav". Thus, these two tar files, lmguw.tar and lmgnav.tar exist under the top-level rvdas directory. The instruments are broken down as shown. Each data file is g-zipped to save space on the distribution. Not all data types are collected everyday or on every cruise. RVDAS data files are named following the convention: LMG[FileID].dDDD. * The FileID is a 4-character code representing the system being logged, for example: lmet (for meteorology) * DDD is the Julian day of the data collection Underway Data File ID Navigation Data File ID Meteorolical lmet Gyro Compass lgyr Knudsen lknu P-CODE GPS lpcd Thermosalinograph ltsg Ashtech ADU2 GPS lash ADCP ladc Trimble NT2100 GPS tgps Sound Velocity Probe lsvp PCO2 System lpco Data is received by the RVDAS system via RS-232 serial connections. The data files that comprise the rvdas data set are described below. A time tag is added to each line of data received and the data is written to disk. YY+DDD:HH:MM:SS.SSS [data stream from instrument] Where, YY: two-digit year, DDD: Julian Day, HH: 2 digit hours, MM: 2 digit minutes SS.SSS: seconds. All times are UTC. The delimiters used to separate fields in the raw data files are usually spaces and commas, but other delimiters are used (::, =, @) and occasionally there is no delimiter. Care should be taken when reprocessing the data that the fields separations are clearly understood. An example data lknu 99+099:00:18:19.775 hf,305.2,lf,304.3 Field Data Units 1 RVDAS Time Tag 2 hf - high frequency flag (12 kHz) 3 high fequency depth meters 4 lf - low frequency flag (3.5 kHz) 5 low frequency depth meters lmet 02+314:23:59:50.067 01.2 047 028 01.3 063 042 0988.8 001.7 084 -000.2192 0000.9358 0025.5875 Field Data Units 1 RVDAS Time Tag 2 Port Wind Speed m/s 3 Port Wind Direction deg 4 Port Wind Direction (standard deviation) deg 5 Starboard Wind Speed m/s 6 Starboard Wind Direction deg 7 Starboard Wind Direction (standard deviation) deg 8 Barometer millibars 9 Temperature (C 10 Relative humidity % 11 PSP (long wave radiometer) Volts 12 PIR (short wave radiometer) Volts 13 PAR (photo-synthetically available radiation, 400 - 700 nm) Volts ltsg 02+310:23:57:30.200 8542 -1.2580 34.1740 -1.2030 3.435 0.349 27.361205 Field Data Units 1 RVDAS Time Tag 2 Scan number 3 Internal water temperature (C 4 Salinity PSU 5 External water temperature (C 6 Transmissometer signal Volts 7 Fluorometer signal (analog) Volts 8 Conductivity S/cm lpco 02+319:23:59:13.748 2002319.99851 7154.27 26.49 1033.6 325.79 6.74 329.3 53.76 0 Equil Field Data Units 1 RVDAS Time Tag 2 Julian date file string Julian 3 IR voltage reading mV 4 Cell temperature (C 5 Barometer millibars 6 VCO2 mL 7 Equilibrator temperature (C 8 PCO2 millibars 9 Gas flow mL/min 10 Solenoid position ID number 11 Measured gas name svp1 00+348:01:59:52.128 1539.40 Field Data Units 1 RVDAS Time Tag 2 Sound velocity m/s ladc 00+019:23:59:59.099 $PUHAW,UVH,-1.48,-0.51,250.6 Field Data Units 1 RVDAS Time Tag 2 $PUHAW 3 UVH (E-W, N-S, Heading) 4 Ship Speed relative to reference layer1 velocity2, East vector knots 5 Ship Speed relative to reference layer1 velocity2, North vector knots 6 Ship heading degrees 1The reference layer is an average velocity measured in a number of depth "bins". On the LMG, the bins are eight meters deep and bins 3-10 define the reference layer. Hence, the reference layer is the water column from 16-80 meters beneath the ship. 2The speed ouput is water velocity relative to the ship's hull and is therefore opposite of the actual movement of the ship. For example, if the ship's heading is due north, the North/South reference layer velocity is likely to be negative (southerly). lash ATTD: Attitude Data 01+081:00:00:00.806 $PASHR,ATT,345605.0,165.03,+001.86,-01.96,0.0018,0.0173,0*22 Field Data Units 1 RVDAS Time Tag $PASHR 2 ATT 3 GPS Time sec. of the week seconds 4 heading (rel. to true North) degrees 5 pitch degrees 6 roll degrees 7 Measurement RMS error meters 8 Baseline RMS error meters 9 attitude reset flag 01+081:00:00:00.966 $GPGGA,235952.00,6051.7937,S,06030.2175,W,1,08,01.0,+00068,M,,M,,*79 Field Data Units 1 RVDAS Time Tag $GPGGA 2 UTC time at position hhmmss.ss 3 Latitude ddmm.mmm 4 North (N) or South (S) 5 Longitude ddmm.mmm 6 East (E) or West (W) 7 GPS quality (1=GPS 2=DGPS) 8 Number of GPS satellites used 9 HDOP 10 Antenna Height meters 11 M for Meters 12 Geoidal height meters 13 M for meters 14 age of diff. GPS data sss 15 differential reference station ID aaaa lgyr 02+315:23:59:58.194 $PASVW,00.1,A*1D 02+315:23:59:58.414 $IIVHW,287.7,T,,M,,N,,K*71 02+315:23:59:58.616 $HEHDT,287.7,T*25 02+315:23:59:58.821 $HEROT,001.6,A*2C 02+315:23:59:58.984 $HCHDT,,T*07 HDT: True Heading 01+083:00:00:02.893 $HEHDT,246.3,T*2C Field Data Units 1 RVDAS Time Tag $HEHDT 2 Heading XXXXX = ddd.d degrees 3 T flag for true heading, checksum ROT: Rate of Turn 01+083:00:00:03.093 $HEROT,-006.3,A*03 Field Data Units 1 RVDAS Time Tag $HEROT 2 Rate of turn degrees/min 3 Status: A = data valid, checksum tgps GGA: Global Positioning Fix Data 00+040:00:00:00.985 $GPGGA,000003,6139.961,S,05949.422,W,1,6,001.64,-00036,M,00000,M,, Field Data Units 1 RVDAS Time Tag $GPGGA 2 Latitude in degrees with decimal minutes ddmm.mmm 3 North (N) or South (S) 4 Longitude in degrees with decimal minutes ddmm.mmm 5 East (E) or West (W) 6 GPS quality (1=GPS 2=DGPS) 7 Number of GPS satellites used 8 Horizontal dilution of precision (HDOP) 9 Antenna height above/below mean-sea-level (geoid) meters 10 Units for antenna height (M = Meters) 11 Geoidal Separation1 12 Units for Geoidal Separation (M = Meters) meters 13 Age of differential GPS data, number of seconds since last SC104 Type 1 or 9 14 Differental reference station ID 1Geoidal Separation: the difference between the WGS-84 earth ellipsoid and mean-sea-level (geoid). A negative value represents mean-sea-level below ellipsoid. GLL: Geographic Position - Latitiude/Logitude 00+040:00:00:00.065 $GPGLL,6139.96,S,05949.42,W,000002,A Field Data Units 1 RVDAS Time Tag $GPGLL 2 Latitude ddmm.mmm 3 North (N) or South (S) 4 Logitude ddmm.mmm 5 East (E) or West (W) 6 UTC of position hhmmss.ss 7 Status: A = Data Valid VTG: Track Made Good and Speed over Ground 00+040:00:00:00.213 $GPVTG,161,T,149,M,009.6,N,017.8,K Field Data Units 1 RVDAS Time Tag $GPVTG 2 Track, degrees true degrees 3 T flag for True 4 Track, degrees magnetic degrees 5 M flag for Magnetic 6 Speed over Ground knots 7 N flag for Knots 8 Speed over Ground kmhr 9 K flag for km/hr VHW: Speed Through Water and Heading 00+040:00:00:00.212 $GPVHW,246,T,234,M,012.3,N,022.8,K Field Data Units 1 RVDAS Time Tag $GPVHW 2 Heading, degrees True degrees 3 T flag for True 4 Heading, degrees Magnetic degrees 5 M flag for Magnetic 6 Speed through water knots 7 N flag for Knots 8 Speed through water km/hr 9 K flag for km/hr ZDA: Time and Date 00+040:00:00:00.285 $GPZDA,000002,09,02,2000,00,00 Field Data Units 1 RVDAS Time Tag $GPZDA 2 UTC time hhmmss.ss 3 Day: 01 - 31 dd 4 Month: 01 - 12 mm 5 Year yyy 6 Local time zone description1, 00 +/-13 hrs 7 Local time zone minutes description, same sign as local hours 1Zone description is the number of whole hours added to local time to obtain GMT, values are negative for East longitudes. BWC: Bearing and Distance to Waypoint 00+040:00:00:00.865 $GPBWC,000003,6209.70,S,05824.00,W,127.2,T,115.3,M,050.1,N,014 Field Data Units 1 RVDAS Time Tag $GPBWC 2 UTC of bearing hhmmss.ss 3 Destination waypoint latitude in degrees, decimal minutes ddmm.mmm 4 Hemisphere Flag: N or S 5 Destination waypoint longitude in degrees, decimal minutes ddmm.mmm 6 Hemisphere Flag: E or W 7 Bearing, degrees true degrees 8 T flag for True 9 Bearing, degrees magnetic degrees 10 M flag for Magnetic 11 Distance to waypoint in nautical miles nm 12 N flag for Nautical Miles 13 Waypoint ID lpcd GGA: GPS Position Fix - Geoid/Ellipsoid 00+019:23:59:59.301 $GPGGA,235958.409,6849.6944,S,13712.8472,W,1,06,1.2,092.4,M,047.3,M,,*67 Field Data Units 1 RVDAS Time Tag $GPGGA 2 UTC time at position hhmmss.sss 3 Latitude ddmm.mmm 4 North (N) or South (S) 5 Longitude ddmm.mmm 6 East (E) or West (W) 7 GPS quality (1=GPS 2=DGPS 3=P-CODE) 8 Number of GPS satellites used 9 HDOP 10 Antenna Height meters 11 M for Meters 12 Geoidal height meters 13 M for meters 14 Null field 15 Checksum GLL: GPS Latitude/Longitude 00+019:23:59:59.381 $GPGLL,6849.6944,S,13712.8472,W,235958.409,A*35 Field Data Units 1 RVDAS Time Tag $GPGLL 2 Latitude degrees 3 North or South 4 Longitude degrees 5 East or West 6 UTC of position hhmmss.sss 7 staus of data (A = valid) 8 Checksum VTG: GPS Track and Ground Speed 00+019:23:59:59.382 $GPVTG,238.7,T,182.3,M,001.8,N,003.3,K*41 Field Data Units 1 RVDAS Time Tag $GPVTG 2 Heading degrees 3 degrees True (T) 4 Heading degrees 5 degrees magnetic (M) 6 Ship speed knots 7 N = knots 8 Speed km/hr 9 Checksum LMG Sensors Shipboard Sensors Sensor Description Serial # Cal. Date Status Port Anemometer R.M. Young 105106 WM35061 07/28/02 collected Stbd Anemometer R.M. Young 105106 WM28393 07/28/02 collected Barometer R.M. Young 61201 BP00873 08/15/01 collected Humidity/Wet Temp R.M. Young 41372VC 6133 09/13/02 collected Mast PAR BSI QSR-240 6394 06/05/01 collected Pyranometer Eppley PSP 31701F3 09/18/02 collected Pyrgeometer Eppley PIR 32031F3 09/18/02 collected GUV Biospherical GUV-511 9228 11/03/01 Not Collected TSG SeaBird SBE21 1789 08/02/02 collected TSG Remote Temp SeaBird 3-01/S 1619 09/13/02 collected Fluorometer Turner 10-AU-005 Lamp: daylight 10-045, reference filter: 10-052, emission filter: 10-051, excitation filter: 10-050. 6046RTD n/a collected Transmissometer WET Labs 9707017 CST-424R 07/31/02 collected P-Code GPS Trimble 20636-00 (SM) 220035265 n/a collected Bathymetry Knudsen 320B/R n/a collected CTD Sensors Sensor Description Serial # Cal. Date CTD Fish Sea-Bird 9Plus-3400m 091480 29-Jun-01 CTD Deck Unit Sea-Bird 11Plus 288 n/a Prim. Temp. Sensor Sea-Bird 3-02/F 1542 23-Jul-02 Sec. Temp. Sensor Sea-Bird 3-02/F 2205 25-Jul-02 Prim. Cond. Sensor Sea-Bird 4-02/0 1223 25-Jun-02 Sec. Cond. Sensor Sea-Bird 4C 1200 06-Aug-02 Diss. Oxygen Sensor Sea-Bird SBE43 0200 02-Dec-02 Fluorometer Chelsea model Mk III Aquatracka 088015 8-Aug-02 Transmissometer C-Star Transmissometer CST-248DR 31-Jul-02 Acquisition and Processing Information Processing Specifics Refer to the instrmnt.cof file along with the specific instrument calibration sheets, both located in the Cal/ directory of the data distribution, for information on how the RVDAS data was collected and processed. Errors and Events This section lists all significant events and known problems with acquisition during this cruise including instrument failures, data acquisition system failures, and other factors affecting this data set. Date (Julian) Time (GMT) Event Location 044 03:24 START DAS PA DOCK 044 03:25 START SONAR PA DOCK 044 13:45 START ADCP 68 West 044 15:05 Start TSG & PCO2 68 West 045 18:32 OCEANUS REBOOTED 047 00:58 REBOOTED PONTUS, OCEANUS and CYCLONE 048 03:29 SHUTDOWN PONTUS, OCEANUS and CYCLONE 048 04:33 RESTART PONTUS, OCEANUS and CYCLONE 048 11:57 Turned off Seawater flow, PCO2, Sonar and TSG Arrived Palmer Station 048 16:42 Change ADCP Pulse width from 16 to 8 At Palmer Station 048 18:00 Turned on Seawater flow, PCO2, Sonar and TSG Depart Palmer Station 048 21:34 Change Sound speed on Sonar to 1456 from 1500 055 19:33 Cycled ADCP and GENTOO to fix ASHTECH failure 061 11:01 Turned off Seawater flow, PCO2, Sonar and TSG Arrived Palmer Station 061 11:02 Change ADCP Pulse width from 8 to 16 At Palmer Station 062 13:15 Turned on Seawater flow, PCO2, Sonar and TSG Depart Palmer Station 065 21:40 Stop TSG, ADCP, PCO2 68 West 065 21:50 Stop DAS 68 West 3 Data Report for LMG03-02 ARSV Laurence M. Gould 2 Raytheon Polar Services United States Antarctic Program Data Report for LMG02-08 ARSV Laurence M. Gould Raytheon Polar Services United States Antarctic Program