#DATA_DATES: 1995/07/17 10:36:00 --- to --- 1995/08/15 13:40:00 #LON_RANGE: 57.28 E --- to --- 65.10 E #LAT_RANGE: 0.08 S --- to --- 23.64 N #DEPTH_RANGE: 13 --- to --- 493 m #SAC_CRUISE_ID: 00251 #PLATFORM_NAME: R/V Meteor #PRINCIPAL_INVESTIGATOR_NAME: unconfirmed #PI_INSTITUTION: unconfirmed #PI_COUNTRY: Germany #PROJECT: JGOFS Arabian Sea #CRUISE_NAME: M32/5 #PORTS: Mahe, Seychelles to Muscat, Oman #GEOGRAPHIC_REGION: Arabian Sea, Indian Ocean #PROCESSED_BY: Institut fuer Meereskunde, Hamburg #NAVIGATION: GPS #QUALITY_NAV: good #GENERAL_INFORMATION: CRUISE NOTES CHIEF SCIENTIST ON SHIP : B. Zeitzschel INSTITUTE : Institute fur Meereskunde COUNTRY : Germany SIGNIFICANT DATA GAPS : 211.04167 to 212.12500 214.41667 to 216.29167 219.50000 to 220.16667 SPECIAL SHIP TRACK PATTERNS : COMMENTS : Emphasis was the investigation of the pelagical system during the Southwest Monsoon. The working program included a section along 65E from the Equator to 15N and four sections from 14N, 62.5E to 18N, 57E and back. During the first three days of the cruise, the recording of the navigation data malfunctioned, leading to a rejection of the ADCP data in post-processing. Only few stations with long station times were completed. Thus, only a few calibration points were available for the calculation of the speed of sound correction. Altogether, data accuracy is lower by at least 3-4 cm/s as compared to WOCE cruises M32/1,4, and 6. ADCP depth range is low between 13N to 17N. Sometimes, maximum depth range decreases to 200m in this area. ADCP INSTRUMENTATION MANUFACTURER : RDI HARDWARE MODEL : 150 SERIAL NUMBERS : FIRMWARE VERSION : TRANSMIT FREQUENCY : 153.6 kHz TRANSDUCER CONFIGURATION : JANUS CONCAVE COMMENTS : ADCP INSTALLATION METHOD/DESCRIPTION OF THE ATTACHMENT TO THE HULL : The transducers were installed in the front hull to reduce noise by propeller cavitation. LOCATION/DEPTH ON HULL : Transducer depth at nominally 5 m REPEATABLE ATTACHMENT : DATE OF MOST RECENT ATTACH. : ACOUSTIC WINDOW : COMMENTS : ADCP INSTRUMENT CONFIGURATION DEPTH RANGE : 13 to 523 BIN LENGTH : varies (note below) NUMBER OF BINS : varies (note below) TRANSMIT PULSE LENGTH : varies (note below) BLANKING INTERVAL : 4 m ENSEMBLE AVERAGING INTERVAL : varies (note below) SOUND SPEED CALCULATION : FUNCTION OF TEMP AT TRANSDUCER BOTTOM TRACKING : varies (note below) DIRECT COMMANDS : COMMENTS : Configuration varied for shallow (<500m) versus deep waters. During data aquisition, the speed of sound was calculated using the water temperature measured by the thermistor at the transducer and a constant salinity value of 35 psu. Configuration History File Columns are as follows: B : CODAS logical block number BT : bottom track mode (on or off) SI : sampling interval or averaging period for ensemble (sec) NB : number of bins BL : bin length (m) PL : pulse length (m) TD : transducer depth (m) BK : blanking length (m) TR : top reference bin (m) BR : bottom reference bin (m) yy/mm/dd hh:mm:ss B BT SI NB BL PL TD BK TR BR 95/07/17 10:36:37 0 off 300 60 8 16 5 4 15 20 95/08/08 10:17:19 37 off 60 60 8 16 5 4 15 20 95/08/08 10:26:34 38 off 300 60 8 16 5 4 15 20 95/08/14 04:52:53 50 on 100 120 4 4 5 4 3 5 95/08/15 12:57:34 54 off 30 60 8 16 5 4 15 20 95/08/15 13:04:35 55 on 30 120 4 4 5 4 3 5 ADCP DATA ACQUISITION SYSTEM SOFTWARE DEVELOPERS : RDI SOFTWARE VERSIONS : DAS 2.48 DATA LOGGER, MAKE/MODEL : PC ADCP/LOGGER COMMUNICATION : USER BUFFER VERSION : User Exit 1920_buffer CLOCK : Ashtech GPS synchronizes the PC clock via the User Exit (ue3.exe) program COMMENTS : SHIP HEADING INSTRUMENT MAKE/MODEL : gyro SYNCHRO OR STEPPER : SYNCHRO RATIO : COMPENSATION APPLIED : no GPS ATTITUDE SYSTEM : YES, Ashtech LOCATION OF ANTENNAS : RIGID ATTACHMENT : LOGGING RATE : ANCILLARY MEASUREMENTS SURFACE TEMP AND SALINITY : thermistor PITCH/ROLL MEASUREMENTS : HYDRO CAST MEASUREMENTS : no BIOMASS DETERMINATION : no DATE OF LAST CALIBRATION : CALIBRATION COEFFICIENTS : BEAM-AVERAGED AGC AVAILABLE?: CALIBRATION NET TOWS? : COMMENTS : ADCP DATA PROCESSING/EDITING PERSONNEL IN CHARGE : M.Dengler DATE OF PROCESSING : 1997 ADDED TO NODC DB : July 1998 NOTABLE SCATTERING LAYERS : COMMENTS : Profile editing performed for bottom reflection, wire interference, and spectral width broadening while underway. NAVIGATION GPS : YES MAKE/MODEL : Magnavox SELECTIVE AVAILABILITY : P-CODE : DIFFERENTIAL : no SAMPLE INTERVAL : LOCATION OF ANTENNA RELATIVE TO TRANSDUCER : TIME OBTAINED RELATIVE TO START/END OF ENSEMBLE : end (UE3.exe program) AVERAGING/EDITING APPLIED : yes, bad fixes edited out LOGGED WITH ADCP DATA : yes LOGGED INDEPENDENTLY : yes COMMENTS : OTHER : CALIBRATION GYROCOMPASS CORRECTION : YES, Ashtech The gyrocompass was corrected for each ensemble with Ashtech information. Discontinuities in the Ashtech data resulted in corrections to the gyro based on least square fit dependencies. BOTTOM TRACK METHOD : No WATER TRACK METHOD : YES CALIBRATION POINTS : 81 AFTER EDITING : 55 MISALIGNMENT ANGLE : mean 1.22, rms 0.5593, drift +0.0013 deg/d CURRENT AMPLITUDE : mean 0.9983, rms 0.0133, drift +0.0001 FINAL SELECTION : AMPLITUDE= 1.0000 PHASE= 1.22 AGREEMENT WITH PREVIOUS CRUISES : good SOUND SPEED CORRECTIONS : No NAVIGATION CALCULATION NAVIGATION USED : GPS REFERENCE LAYER DEPTH RANGE : bins 5 to 20 FILTERING METHOD FOR SMOOTHING REFERENCE LAYER VELOCITY (FORM/WIDTH) : Blackman window function of width T ( .5 hr): w(t) = 0.42 - 0.5 * cos(2 * pi *t / T) + 0.08 * cos(4 * pi * t / T). FINALIZED SHIP VEL/POSITIONS STORED IN DATABASE : YES COMMENTS : GENERAL_ASSESSMENT : OK ON-STATION VS. UNDERWAY : OK VECTOR, CONTOUR, STICK PLOTS: OK COMMENTS : OK REFERENCES (DATA REPORTS,ETC.) : Data report as follows: Dengler, M. 1998. Shipboard ADCP Measurements in the Arabian Sea 1995. Data Acquisition, Processing, and Calibration. FS Meteor WOCE Cruises M32/1, M32/4, M32/6 and JGOFS cruises M32/5, M33/1. Institut fuer Meereskunde, Troplowitzstr. 7, 22529 Hamburg.