Bottom track corrected and reposted November 20, 2014 --------------------------------------------------------------------------------- BEST Bering Shelf Project (Bering Ecosystem Study) NSF Grant ARC-0732428 RDI Acoustic Doppler Current Meter (ADCP) Data on the BEST2008 Mooring C55 This directory contains the data from the RDI Acoustic Doppler Current Profiler (ADCP), directed upward and moored at approximately 47m depth from July 2008 to July 2009 in the Bering Sea. This instrument measured the half-hourly-average horizontal current speed and direction in 1m bins upward to the surface or bottom of the ice, based on Doppler-shifted returns from suspended material. Other instruments were installed on the mooring, including Sea-Bird Temperature-Conductivity Recorders. Data from those instruments are collected in separate directories. ----- BEST 2008-2009 Bottom-Anchored Mooring C55-08 Position = 60 degrees 10.376 minutes North, 170 degrees 05.374 minutes West Sounded ocean depth = 55 meters Year/day/time at depth = 2008/192/1923 UTC Recovery/re-deployment to remove ADCP cover Year/day/time final at depth = 2008/192/1951 UTC Year/day/time of release = 2009/193/0427 UTC ----- Instrument Teledyne RDI 300kHz Workhorse Acoustic Doppler Current Profiler s/n 1495 -- Instrument depth Design depth 47m Corrected depth 47m -- Instrument settings 1. ADCP INFORMATION: Frequency 307 kHz Beam angle 20 deg 4 beam system Up-looking orientation Convex beam pattern Transducer head connected CPU firmware 16.20 2. ADCP SETUP: Number of bins 60 Bin length 1.0 m Blank after transmit 1.8 m Distance to first bin 4.0 m Transmit length 2.0 m Pings per ensemble 175 Time per ping 1.00 s Profiling mode 1 Time interval (min): 30.00 Error from Pre-compass Calibration (deg): 0.80 Error from Post-compass Calibration (deg): NA Direction corrected for magnetic declination (deg) of 10.0 Velocity calculation uses speed of sound calculated by ADCP. from ADCP internal temperature Time stamp corrected for clock drift. ADCP= 0. min FAST at end of deployment. Time stamp = start of time interval Data processed in earth coordinates by ADCP. ADCP mounted in non-vaned frame Comments: Battery died on 2009 day 150. ========================== ----- Data files The data from this ADCP are represented by multiple ASCII files, each containing header information followed by the data in space-delimited columns. In addition, this archive includes the original Binary file as downloaded from the instrument. -- Original Binary File Size BEST2008_ADCP01495.000 22,659,072 bytes -- Instrument Data File C55_2008_01495.ins 1,917,101 bytes -- Ice Bottom Track File C55_2008_01495.btm 3,717,617 bytes -- Water Motion Files (one per 1m vertical bin) Size of each = 2,801,533 bytes Bin number Nominal_depth Depth_range Filename 1 43m 43m-42m C55_2008_01495_bin01.rdat 2 42m 42m-41m C55_2008_01495_bin02.rdat 3 41m 41m-40m C55_2008_01495_bin03.rdat 4 40m 40m-39m C55_2008_01495_bin04.rdat 5 39m 39m-38m C55_2008_01495_bin05.rdat 6 38m 38m-37m C55_2008_01495_bin06.rdat 7 37m 37m-36m C55_2008_01495_bin07.rdat 8 36m 36m-35m C55_2008_01495_bin08.rdat 9 35m 35m-34m C55_2008_01495_bin09.rdat 10 34m 34m-33m C55_2008_01495_bin10.rdat 11 33m 33m-32m C55_2008_01495_bin11.rdat 12 32m 32m-31m C55_2008_01495_bin12.rdat 13 31m 31m-30m C55_2008_01495_bin13.rdat 14 30m 30m-29m C55_2008_01495_bin14.rdat 15 29m 29m-28m C55_2008_01495_bin15.rdat 16 28m 28m-27m C55_2008_01495_bin16.rdat 17 27m 27m-26m C55_2008_01495_bin17.rdat 18 26m 26m-25m C55_2008_01495_bin18.rdat 19 25m 25m-24m C55_2008_01495_bin19.rdat 20 24m 24m-23m C55_2008_01495_bin20.rdat 21 23m 23m-22m C55_2008_01495_bin21.rdat 22 22m 22m-21m C55_2008_01495_bin22.rdat 23 21m 21m-20m C55_2008_01495_bin23.rdat 24 20m 20m-19m C55_2008_01495_bin24.rdat 25 19m 19m-18m C55_2008_01495_bin25.rdat 26 18m 18m-17m C55_2008_01495_bin26.rdat 27 17m 17m-16m C55_2008_01495_bin27.rdat 28 16m 16m-15m C55_2008_01495_bin28.rdat 29 15m 15m-14m C55_2008_01495_bin29.rdat 30 14m 14m-13m C55_2008_01495_bin30.rdat 31 13m 13m-12m C55_2008_01495_bin31.rdat 32 12m 12m-11m C55_2008_01495_bin32.rdat 33 11m 11m-10m C55_2008_01495_bin33.rdat 34 10m 10m-9m C55_2008_01495_bin34.rdat 35 9m 9m-8m C55_2008_01495_bin35.rdat 36 8m 8m-7m C55_2008_01495_bin36.rdat 37 7m 7m-6m C55_2008_01495_bin37.rdat 38 6m 6m-5m C55_2008_01495_bin38.rdat 39 5m 5m-4m C55_2008_01495_bin39.rdat 40 4m 4m-3m C55_2008_01495_bin40.rdat 41 3m 3m-2m C55_2008_01495_bin41.rdat 42 2m 2m-1m C55_2008_01495_bin42.rdat 43 1m 1m-0m C55_2008_01495_bin43.rdat ------------------------------------------------------------------------------- Synopsis: As part of the BEST Bering Shelf Project (NSF Grant ARC-0732428), a family of oceanographic moorings has been anchored to the bottom on the eastern Bering Sea beginning in summer 2008, recovered and redeployed annually. Mooring C55-08 was located on the central mooring line across the shelf on the 55m isobath. Vertically distributed instruments measured ocean properties at fixed depths, recording internally. These included three Sea-Bird Temperature-Conductivity Recorders, an RDI Acoustic Doppler Currnt Profiler (ADCP), a WetLabs Fluorometer, and 15 HOBO Temperature Recorders. This archive contains the data from the ADCP on C55-08. For further information, please contact Dr. Knut Aagaard aagaard@apl.washington.edu (206) 543-8942 Kay Runciman kay@apl.washington.edu (206) 543-1378 Roger Andersen roger@apl.washington.edu (206) 543-1258 at Polar Science Center, Applied Physics Lab, University of Washington 1013 NE 40th, Seattle, WA 98105-6698 USA FAX (206) 616-3142 ------------------------------------------------------------------------------- Meta data ========= 1) Platform: Bottom-anchored oceanographic mooring in the Bering Sea. 2) Project title: BEST Bering Shelf Project (Bering Ecosystem Study) 3) Data collection dates: July 2008 to July 2009 4) PI: Knut Aagaard (aagaard@apl.washington.edu) 5) Data collection method: Moored and un-vaned RDI Acoustic Doppler Current Profiler, upward-looking, sampling every 30 minutes. ( http://www.rdinstruments.com/ ) 6) Data calibration method: Time stamps have been corrected for observed instrument clock drift. - All times are given in UTC. - The Decimalday field in the right-most column in both formats is the decimal day of the sample's year, 2008 or 2009. We accept RDI specifications stating the ADCP calibrations remain stable for several years. In addition to the factory calibration, we perform a hard/soft iron removal calibration to remove the influence of the alkaline battery pack. This is done in Seattle every time a new battery pack is installed in each ADCP prior to deployment. Estimated compass error is included in the data file header. - direction corrected to true north, magnetic declination used = +10.0 degrees. This was obtained from the NOAA Geophysical Calculator entering the mooring position, a date approximately halfway through the deployment, and sea level. - data requiring speed of sound in water are corrected by the ADCP using the water temperature measured by the ADCP. - intensity of returned signals is not specially calibrated. 7) Instrumentation used: RDI 300 kHz ADCP 8) Quality control procedures: ADCP data rely on ADCP internal temperature for speed of sound corrections. ADCP Data files are included for all bins up to the surface although bins near the surface contain much larger errors and should be treated with caution. 9) Data format: Space delimited ASCII, formats from header: -- Instrument Data File data format and sample line: nnnnn Year Mn Dy Hr Mi s/n Temp B3_Hdg Pitch Roll HdgSD PitchSD RollSD SpSound MAXdt Julianday nnnnn yyyy mm dd hh mm nnnn deg deg deg deg counts counts counts cm/s s dddd.ddddd 123456789-123456789-123456789-123456789-123456789-123456789-123456789-123456789-123456789-123456789-123456789-123456789 # 1 2008 07 06 00 00 1495 18.460 116.39 33.56 -32.07 0 0 0 1514000 0.03 188.00000 -- Ice Bottom Track File data format and sample line: nnnnn Year Mn Dy Hr Mi s/n SpSound DirTr Speed range1 range2 range3 range4 rangeAve VelE VelN VelUp VelErr %good1 %good2 %good3 %good4 amp1 amp2 amp3 amp4 corr1 corr2 corr3 corr4 corrAve Julianday nnnnn yyyy mm dd hh mm nnnn cm/s degTr cm/s m m m m m cm/s cm/s cm/s cm/s counts counts counts counts counts counts counts counts counts dddd.ddddd 123456789-123456789-123456789-123456789-123456789-123456789-123456789-123456789-123456789-123456789-123456789123456789-123456789-123456789-123456789-123456789-123456789123456789-123456789-123456789-123456789-123456789-1234567891234567 # 1 2008 07 06 00 00 1495 1514000 10.0 9999.9 0.0 0.0 0.0 0.0 0.0 9999.9 9999.9 9999.9 9999.9 0 0 100 0 0 0 0 0 0 0 0 0 0 188.00000 -- Water Motion Files (one per 1m vertical bin) data format and sample line: nnnnn Year Mn Dy Hr Mi s/n SpSound DirTr Speed Bin Depth VelUp VelErr %good4 corr1 corr2 corr3 corr4 CorrAve inten1 inten2 inten3 inten4 Julianday nnnnn yyyy mm dd hh mm nnnn cm/s degTr cm/s m cm/s cm/s counts counts counts counts counts counts counts counts counts dddd.ddddd 123456789-123456789-123456789-123456789-123456789-123456789-123456789-123456789-123456789-123456789-123456789123456789-123456789-123456789-123456789-123456789-12345678912345678 # 1 2008 07 06 00 00 1495 1514000 10.0 0.3 1 43. -0.4 9999.9 0 81 106 64 71 80 76 67 128 68 188.00000 The Decimalday field in the right-most column in all ASCII formats is the decimal day of the sample's year, 2008 or 2009. 10) Data collection problems: See item 13) (below) regarding current direction. 11) Other related data sets: Data from the Sea-Bird temperature-conductivity recorders on this same mooring are provided together with this archive. Other instruments from BEST Bering Shelf Project are submitted by our collaborators from the University of Alaska Fairbanks (UAF). 12) Conditions for use or citation: In reports and publications that use these data, please acknowledge their source: K. Aagaard, North Pole Environmental Observatory, NSF Grant ARC-0732428. 13) Data qualifications or warnings: ADCP data: Standard RDI limitations apply estimated accuracy > 0.5 cm/s in speed for water velocities (190 pings per ensemble) Estimated errors (given in the data files) vary with bin and time > 0.5 cm/s in speed for ice velocities (10 pings per ensemble) Estimated errors (given in the data files) vary with time Range to ice only accurate to 1% of range to surface (i.e. ~ 0.5 m) 14) Grant numbers: NSF Grant ARC-0732428 15) Sample repository location: BEST Bering Shelf Project data are permanently archived at Bering Sea Ecosystem Study Data Archive http://www.eol.ucar.edu/projects/best/ -------------------------------------------------------------------------------