README FILE FOR BERING STRAIT MOORING DATA 18th Feb 2024 ============================================================================= 12345678901234567890123456789012345678901234567890123456789012345678901234567 Bering Strait Moorings 2021-2022 This is an archive of data from moorings deployed in Bering Strait from summer 2021 and to summer 2022. Mooring deployments were funded by the NSF-Arctic Observing Network award PLR-1758565 (PIs: Woodgate and Peralta-Ferriz). The mooring work required 2 dedicated cruises: - in 2021 (7th - 17th July), a ~ 11 day cruise on the US vessel Norseman2 deployed the moorings. Some CTD sections were run on this cruise, and those data are archived separately. - in 2022 (8th-19th September), a ~ 12 day cruise on the US vessel Norseman2 recovered the moorings. Some CTD sections were run on this cruise, and those data are archived separately. In 2021, a total of three moorings were deployed: - two moorings (A2 and A4) in the US channel of the strait, - one mooring (A3) at a site just north of the strait. In what follows, mooring names include a two digit suffix to represent year of deployment. In 2022, moorings A3 and A4 were recoverd, but mooring A2 could not be found despite an extensive acoustic search. In summer 2023, a multibeam search of the region was undertaken using a portable Norbit system installed on the Norseman2, but unfortunately no sign of the lost mooring was discovered, and we conclude the mooring is irretrievably lost. Sites A2, and A3 were established in 1990. A2 and A3 have been occupied almost continuously (all years except 96-97) since then. Site A4 was established in 2001. Mooring location A2 is in the middle of the eastern (Alaskan side) channel. Mooring location A3 is just north of the strait, immediately east of the Russian-US EEZ (Exclusive Economic Zone) line. Experience has shown that site A3 samples both eastern and western channel water. Mooring location A4 is close to the Alaskan coast and allows measurement of the Alaskan Coastal Current. For an overview of previous and on-going Bering Strait mooring work, please see http://psc.apl.washington.edu/BeringStrait.html. Moorings carry a variety of instruments, listed in the table below. All records are year-round, sampling hourly or more frequently (Time Int. in table below). Data from instruments marked with * are not included in this archive. For access to these data, please contact the named PI in list below table. 12345678901234567890123456789012345678901234567890123456789012345678901234567 -------------------------------------------------------------------------- ID Deployed Latitude Longitude Instrument S/N Time Inst. Water in Year (N) (W) Int. Depth Depth -------------------------------------------------------------------------- A3-21 2021 66 19.64 168 57.00 Upper ISCAT 8964 NR 7m 58m recovered by dragging Lower ISCAT 20128 10min 16m 58m at position 66 18.78 168 55.74 ISCAT-Logger 23 30min ... 58m likely moved 0903-1433 25 Jan2022 300kHz-ADCP 2332 30min 42m 58m SBE37 23132 60min 42m 58m SOUNDTRAP6079-1476694 - 49m 58m A4-21 2021 65 44.74 168 15.77 ISCAT 22407 NR 14m 49m ISCAT-Logger 04 30min ... 49m 300kHz-ADCP 2232 30min 37m 49m SBE37 23154 60min 41m 49m Mooring A2-21 was not recovered, but deployment information is included here incase the mooring is ever rediscovered in the future. (depths are estimates from mooring design and past experience of the region) A2-21 2021 65 46.85 168 34.09 *ISCAT 20937 10min 16m 56m Not recovered, assumed lost *ISCAT-Logger 26 30min ... 56m *300kHz-ADCP 19413 30min 46m 56m *SBE37 23153 60min 50m 56m -------------------------------------------------------------------------- Depths are estimated from mooring design and pressure sensors where available, and are good to 1-2m. NR=instrument not recovered ND=No data Instruments with data included here: ISCAT - SBE37IM in ice resistant float, telemetering data inductively to a Logger below (system developed at APL-UW) 300KHz-ADCP - 300kHz RDI/Teledyne Workhorse Acoustic Doppler Current Profiler SBE37 Microcat - Seabird SBE 37 Temperature Salinity Pressure recorder SBE16woptic - Seabird SBE16plus with optical data (including some or all of fluorescence, turbidity, transmissivity and PAR) - see headers SBE26p-BPG - Seabird SBE26plus Bottom Pressure Gauge RCM9Turb - Aanderaa RCM9 acoustic current meter with turbidity sensor RCM9LW - Aanderaa Lightweight RCM9 acoustic current meter Instruments with data not included here: AARI-CM&CTD - Current meter and CTD from AARI (Arctic and Antarctic Research Institute, Russia), PI: Igor Lavrenov, AARI ISUS - ISUS Nitrate sensor, PI: Terry Whitledge, UAF AURAL M2* - Aural Marine Mammal Acoustic Recorder, PI: Kate Stafford, UW APL Marine Rec* - APL Marine Recorder, PI: Kate Stafford, UW. Soundtrap - APL Marine Recorder, PI: Kate Stafford UW. Each data file contains the data from one instrument-year - the listed year in the mooring name is the year in which the mooring was deployed. For RCMs and SBEs, calibrated data are recorded in one file per instrument per year, with naming convention: BeringStrait_yyyy_ID_III_#####.ttt yyyy=Deployment year; ID=mooring ID; III=instrument type; #####=serial number; ttt=indicates calibration, with .pre=pre-deployment calibration used, .ppp=pre and post deployment calibrations merged. The SBE-16 and 37 hexidecimal files (unaltered from the download) are also included, indicated by extension .hex or .asc For the ADCPs, there are multiple files per instrument. BeringStrait_yyyy__ID_#####ADCPraw.000 = Binary download from the ADCP (see notes below for multiple .000 files) BeringStrait_yyyy__ID_#####_ADCPdeploytests.txt = pre deployment tests BeringStrait_yyyy__ID_#####_ADCPrecoverytest.txt = post deployment tests The remainder are ASCII conversions of the data, corrected for clock drift and magnetic declination. BeringStrait_yyyy__ID_#####.btm = ASCII bottom track data (including ice range and velocity) BeringStrait_yyyy__ID_#####.ins = ASCII instrument data (e.g. heading, pitch, roll, temperature) BeringStrait_yyyy__ID_#####_bin01.rdat = ASCII water velocity data in Bin 1 BeringStrait_yyyy__ID_#####.bin02.rdat = ASCII water velocity data in Bin 2 etc. (Bin depths are given in the data files) Header information is included in each data file. ----------------------------------------------------------------------------- For details of the measurements and their interpretation, please see: Woodgate, R.A., K.M.Stafford and F.G.Prahl (2015) A synthesis of year-round interdisciplinary mooring measurements in the Bering Strait (1990-2014) and the RUSALCA years (2004-2011), Oceanography 28(3):46-67, doi:10.5670/oceanog.2015.57 and Woodgate, R.A., 2018, Increases in the Pacific inflow to the Arctic from 1990 to 2015, and insights into seasonal trends and driving mechanisms from year-round Bering Strait mooring data, Progress in Oceanography, 160, 124-154, doi:10.1016/j.pocean.2017.12.007. Please use both 2015 and 2018 citations for these data. For an overview of cruises and project, please see: http://psc.apl.washington.edu/BeringStrait.html For relevant papers, please see: Roach, A.T., K. Aagaard, C. H. Pease, S.A. Salo, T. Weingartner, V. Pavlov, and M. Kulakov (1995) Direct measurements of transport and water properties through Bering Strait, J. Geophys. Res., 100, 18,443-18,457. Woodgate, R.A., and K. Aagaard (2005) Revising the Bering Strait freshwater flux into the Arctic Ocean, Geophys. Res. Lett., 32, L02602, doi:10.1029/2004GL021747. Woodgate, R.A., K. Aagaard, and T. Weingartner (2005) Monthly temperature, salinity, and transport variability of the Bering Strait throughflow, Geophys. Res. Lett., 32, No. 4, L04601, doi:10.1029/2004GL021880. Woodgate, R. A., K. Aagaard, and T. J. Weingartner (2005) A year in the physical oceanography of the Chukchi Sea: Moored measurements from autumn 1990-1991,Deep-Sea Res., Part II, 52, 3116-3149, doi: 10.1016/j.dsr2.2005.10.016. Woodgate, R. A., K. Aagaard, and T. J. Weingartner (2006) Interannual changes in the Bering Strait fluxes of volume, heat and freshwater between 1991 and 2004, Geophys. Res. Lett., 33, L15609, doi:10.1029/2006GL026931. Woodgate, R. A., T. Weingartner, and R. Lindsay (2010), The 2007 Bering Strait oceanic heat flux and anomalous Arctic sea-ice retreat, Geophys. Res. Lett., 37, L01602, doi:10.1029/2009GL041621. Woodgate, R.A., T. Weingartner, and R. Lindsay (2012), Observed increases in Bering Strait oceanic fluxes from the Pacific to the Arctic from 2001 to 2011 and their impacts on the Arctic Ocean water column, Geophys. Res. Lett., 39, L24603, doi:10.1029/2012GL054092. Woodgate, R.A., (2018), Increases in the Pacific inflow to the Arctic from 1990 to 2015, and insights into seasonal trends and driving mechanisms from year-round Bering Strait mooring data, Progress in Oceanography, 160, 124-154, doi:10.1016/j.pocean.2017.12.007. Woodgate, R.A., and C.Peralta-Ferriz, (2021), Warming and Freshening of the Pacific Inflow to the Arctic from 1990-2019 implying dramatic shoaling in Pacific Winter Water ventilation of the Arctic water column, Geophysical Research Letters, doi:10.1029/2021GL092528 For queries, please contact: Rebecca Woodgate woodgate@uw.edu (206) 221-3268 Polar Science Center, Applied Physics Lab, University of Washington 1013 NE 40th, Seattle, WA 98105-6698 USA ------------------------------------------------------------------------------ Meta data ========= 1) Platform: Subsurface oceanographic moorings 2) Project title: Bering Strait 3) Data collection dates: July 2021 to Sept 2022 4) PI: Rebecca Woodgate (woodgate@uw.edu) 5) Data collection method: Year-round moorings carrying - Sea-Bird temperature/conductivity and pressure recorders (SBE) - RDI 300kHz Workhorse Acoustic Doppler Current Profilers (ADCP) - APL data loggers for inductive data from ISCAT system 6) Data calibration method: Unless noted otherwise in the header on each data file, timestamps have been corrected for observed instrument clock drift. All times are given in GMT. For SBEs, calibration coefficients are given in header file. SBEs: - Generally pre and post calibrated by the manufacturer (indicated by suffix .ppp). - pre and post calibrations linearly time-weighted through the deployment. - .pre suffix indicates only pre-cruise calibration used - just prior to recovery, a CTD cast was performed in the vicinity of the mooring as an attempt to provide and inwater calibration. This is found to be of inconsistent quality as a calibration check. Immediately after recovery, SBE instruments were placed in a stirred tank of sea water, to check immediate post deployment calibrations. This gives the best estimate of any residual offset in salinity after the manufacturer's post calibration. For full details, see cruise report. These are both just informational checks to assess how well the post-cruise manufacturer's calibration captures the final in-water state. The final post-cruise calibration used is that from the manufacturer, to be consistent with prior data processing. ADCPS: Tested by APL/manufacturer pre deployment. - compasses calibrated as per manufacturer's specifications in Seattle prior to deployment. Estimated compass error is included in the header file - where available, at sea compass check also included in header file - direction corrected to true north, magnetic declination used is cited in the header. - data requiring speed of sound in water is corrected by the ADCP using the water temperature measured by the ADCP. - intensity of returned signals is not specially calibrated. 7) Instrumentation used: (see table for sampling frequencies) Sea-Bird SBE16 recorders ISCAT loggers (SBE37 Microcat logging data to an APL-Logger) RDI 300 kHz Workhorse ADCP - bin size typically 2m 8) Quality control procedures: Quality control provided by Rebecca Woodgate. 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 (likely due to surface effects) and should be treated with caution. 9) Data format: SBE data - ASCII, format given in individual headers (uncalibrated "hex", "asc" or "XML" data also included for SBEs) ADCP data - 2 formats: a) BINARY download file from ADCP and b) ASCII conversion of these files (in 2m bins) 10) Data collection problems: By Mooring: - After initial deployment 10th July 2021, on 11th July 2021, # mooring A3 was recovered (starting 17:06) and redeployed (completed 18:19) to adjust Miscat weak link. Data records for this time window are thus contaminated and should be neglected. After the one year deployment, mooring A3 was discovered about 1nm SE of the original position, new position approximately 66 18.78N 168 55.74W. Data suggest it was dragged to this point by sea ice on 25Jan2022 0903-1433. A dragging operation was required to release mooring, likely due to biofouling of the release. - biofouling is a typical issue in the strait, and was still sigificant on these moorings, although salinity cells were generally clear on recovery. The effect of this on the data is to make salinities appear erroreously fresh. Estimates of the extent of this problem by instrument are given below and in the individual file headers. Photographic documentation of biofouling on recovery is available via cruise reports, included here and on the Bering Strait website: http://psc.apl.washington.edu/BeringStrait.html. By Instrument: === ISCATS (Loggers and SBE37s) A321 - Upper SBE37 8964 - lost after 15th Dec 2021 - Logger 23 - Data only good to 15th Dec 2021 - top float with SBE37 was lost, data only from logger - logger clock 43 min slow on recovery but and time stamps here are taken from the SBE37, - note start time is not on whole hour - note data are not regular in time - post cal not available, but other data show sensor drift in the strait may be as large as 0.05-0.1psu too fresh by end of year deployment. ** Data times irregular, only uncorrected logger time given A321 - Lower SBE37 20128 - recovered - clock 0 min fast by end of deployment - note start time is not on whole hour - 3 records are missing at some unknown point, making timestamp uncertainty of 30min. However in and out of water times match those recorded, suggesting lost records are not near start or end of record. - record linearly interpolated between pre and pos cal (difference 0.03psu) - testtank shows salinities 0.03psu fresh on recovery A421 - Iscat SBE37 22407 - lost after 15th Feb 2022 - Logger 04 - Data only good to 15th Feb 2022 - top float with SBE37 was lost, data only from logger - logger clock 21 min slow on recovery but and time stamps here are taken from the SBE37, - note start time is not on whole hour - note data are not regular in time - post cal not available, but other data show sensor drift in the strait may be as large as 0.05-0.1psu too fresh by end of year deployment - recovered file contained many spurious characters, requiring over 500 edits to align columns. Usually the data were recoverable however where missing data were interpolated between neighbouring points. Only 2 interpolations were over 2 timesteps, all others were over one time step. - note data are not regular in time. Gaps of more than an hour are not uncommon. In Jan 2022, there is a gap of more than 2 days. ** Data times irregular, only uncorrected logger time given === SBE37s (non iscat) A321_23132 - Cell clear on recovery - Clock 30s slow on recovery - record linearly interpolated between pre and pos cal - testtank shows salinities 0.02psu fresh on recovery A421_23154 - biofouling high, but cell seems mostly clea - Clock 34s slow on recovery - SB37 memory was not entirely wiped before deployment (1 record remained). Start time is adjusted to reflect this. Thus, record 1 time is thus wrong, but Record 2 onwards have the correct time. - record linearly interpolated between pre and pos cal - testtank shows salinities 0.04psu fresh on recovery === ADCPs Note that ADCP range measurements are not corrected for pitch and roll. For full discussion and correction, see: Woodgate and Holroyd, 2011, included in archive. A321_adcp02332 - pitch and roll generally < 10 deg, peaking at 20 deg - roll frequently 5-10deg - range measurements not corrected for pitch and roll - large errors in bin1 - data generally good until Bin14 (~12m) A421_adcp02232 - pitch and roll generally < 10 deg, peaking at 20 deg - pitch and roll frequently 5-10deg, especially early in data - range measurements not corrected for pitch and roll - bin1 large data errors - data generally good until Bin11 (~13m) 11) Other related data sets: This data set is a continuation of mooring measurements made in the Bering Strait almost continuously since 1990. Mooring data have already been archived via the SBI project, managed by JOSS/EOS, and at NODC (now NCEI), and metadata at arcticdata.io and AOOS. For details see http://psc.apl.washington.edu/BeringStrait.html https://data.eol.ucar.edu/master_lists/generated/sbi/ http://www.ncei.noaa.gov Since 2000, CTD sections have been run in the Bering Strait on the mooring cruises. These data are also accessible via the http links above. 12) Conditions for use or citation: Data freely available Please, as a courtesy, contact the PIs before using these data and cite as Woodgate et al., 2015 and Woodgate, 2018, viz: Woodgate, R.A., K.M.Stafford and F.G.Prahl (2015) A synthesis of year-round interdisciplinary mooring measurements in the Bering Strait (1990-2014) and the RUSALCA years (2004-2011), Oceanography 28(3):46-67, doi:10.5670/oceanog.2015.57 and Woodgate, R.A., 2018, Increases in the Pacific inflow to the Arctic from 1990 to 2015, and insights into seasonal trends and driving mechanisms from year-round Bering Strait mooring data, Progress in Oceanography, 160, 124-154, doi:10.1016/j.pocean.2017.12.007. 13) Data qualifications or warnings: See also Data collection problems. For data issues relevant to a specific deployment, see the individual headers. In general: SBE data: Standard Sea-Bird limitations apply SBE37s: - estimated accuracy 0.002 deg C, 0.0003 S/m (corresponding to 0.008 psu), and < 1 db. SBE16s: - estimated accuracy 0.02 deg C, 0.0012 S/m (corresponding to 0.02 psu), and < 1 db. FOR BOTH: - see header files for difference between pre and post calibration which are usually 0.03 psu or greater. - Note that post-calibrations on the SBE16s in the strait often suggest salinity sensor drift during deployment of between 0.02 and 0.1psu, and this should be considered if post calibrations are not available - Note also that clogging of the salinity cell during deployment will not be captured by the post calibration and thus generally ends of records should be suspected for anomalously low salinities, especially if the SBE is not mounted vertical. ADCP data: Standard RDI limitations apply - estimated accuracy ~ 0.5 cm/s for water velocities (~100 pings per ensemble) Estimated errors (given in the files) vary with bin and time ~ 1 cm/s for ice velocities (2 or 5 pings per ensemble) Estimated errors (given in the files) vary with time ~ 1 deg in direction (see header files) Range to ice - accurate to 1% of range to surface (i.e. ~ 0.4 m) ~ 0.4 deg C in temperature Note that ADCP range measurements are not corrected for pitch and roll. For full discussion and correction, see: Woodgate and Holroyd, 2011, included in archive. 14) Grant numbers: Mooring sponsorship came from - National Science Foundation (NSF) Arctic Observing Network (AON) program, grant PLR-1758565 (PI: Woodgate and Peralta-Ferriz) 15) Sample repository locations: National Centers for Environmental Information (http://www.ncei.noaa.gov) (previously National Ocean Data Center) University of Washington (http://psc.apl.washington.edu/HLD) 16) Please use the following 2 citations for these data: Woodgate, R.A., K.M.Stafford and F.G.Prahl (2015) A synthesis of year-round interdisciplinary mooring measurements in the Bering Strait (1990-2014) and the RUSALCA years (2004-2011), Oceanography, 28(3):46-67, doi:10.5670/oceanog.2015.57 and Woodgate, R.A., 2018, Increases in the Pacific inflow to the Arctic from 1990 to 2015, and insights into seasonal trends and driving mechanisms from year-round Bering Strait mooring data, Progress in Oceanography, 160, 124-154, doi:10.1016/j.pocean.2017.12.007. ============================================================================== ============================================================================== FILE LISTING ============= Total number of files: 69 including 3 subdirectories Size (b) Name --------- ---- = Metadata file (1 file) 28501 Bering_Strait_Moorings_2021-2022_NSFAON_ReadMe_versFeb2024.txt = Cruise reports (2 files) and 1 technical note (1 file) 7073075 BeringStrait2021CruiseReport_Norseman2_24thMay2022withEventLog_small.pdf 7197177 BeringStrait2022CruiseReport_Norseman2_versMay2023_smallwEL.pdf 1853097 WoodgateandHolroyd2011_BTrangeCorrection.pdf = ISCAT data (4 files) - 2 ICLog*.pre of pre calibrated logger data - 1 ICsbe37*.ppp pre-post calibrated SBE37 data - 1 ICsbe37*.hex raw SBE37 data 613153 BeringStrait_2021_A3_ICLog23U_08964.pre 5954594 BeringStrait_2021_A3_ICsbe37L_20128.ppp 2243472 BeringStrait_2021_A3_ICsbe37L_20128raw.hex 732292 BeringStrait_2021_A4_ICLog04_22407.pre = SBE37 (4 files) - 2 .hex files of raw data - 2 .ppp files of pre-post calibrated data (see also con file directory) 998691 BeringStrait_2021_A3_sbe37_23132.ppp 378064 BeringStrait_2021_A3_sbe37_23132raw.hex 998325 BeringStrait_2021_A4_sbe37_23154.ppp 378111 BeringStrait_2021_A4_sbe37_23154raw.hex .. and the 3 subdirectories, One subdirectory of SBE .con calibration files ./BeringStrait_2021_SBEconfiles: - 3 calibration files for SBE37s (2SM, 1IM) 3174 SBE37IM_03720128_2022_09_15.xmlcon 3181 SBE37SM-RS232_03723132_2022_09_15.xmlcon 3181 SBE37SM-RS232_03723154_2022_09_15.xmlcon Two subdirectories of ADCP data, naming conventions as described above, (each 27 files) ./BeringStrait_2021_A3_adcp02332: 4983655 BeringStrait_2021_A3_02332.btm 2571049 BeringStrait_2021_A3_02332.ins 46313 BeringStrait_2021_A3_02332ADCPdeploytests.txt 14409960 BeringStrait_2021_A3_02332ADCPraw.000 26929 BeringStrait_2021_A3_02332ADCPrecoverytests.txt 3756195 BeringStrait_2021_A3_02332_bin01.rdat 3756195 BeringStrait_2021_A3_02332_bin02.rdat 3756195 BeringStrait_2021_A3_02332_bin03.rdat 3756195 BeringStrait_2021_A3_02332_bin04.rdat 3756195 BeringStrait_2021_A3_02332_bin05.rdat 3756195 BeringStrait_2021_A3_02332_bin06.rdat 3756195 BeringStrait_2021_A3_02332_bin07.rdat 3756195 BeringStrait_2021_A3_02332_bin08.rdat 3756195 BeringStrait_2021_A3_02332_bin09.rdat 3756195 BeringStrait_2021_A3_02332_bin10.rdat 3756195 BeringStrait_2021_A3_02332_bin11.rdat 3756195 BeringStrait_2021_A3_02332_bin12.rdat 3756195 BeringStrait_2021_A3_02332_bin13.rdat 3756195 BeringStrait_2021_A3_02332_bin14.rdat 3756195 BeringStrait_2021_A3_02332_bin15.rdat 3756195 BeringStrait_2021_A3_02332_bin16.rdat 3756195 BeringStrait_2021_A3_02332_bin17.rdat 3756195 BeringStrait_2021_A3_02332_bin18.rdat 3756195 BeringStrait_2021_A3_02332_bin19.rdat 3756195 BeringStrait_2021_A3_02332_bin20.rdat 3756195 BeringStrait_2021_A3_02332_bin21.rdat 3756195 BeringStrait_2021_A3_02332_bin22.rdat ./BeringStrait_2021_A4_adcp02232: 4943200 BeringStrait_2021_A4_02232.btm 2550430 BeringStrait_2021_A4_02232.ins 14424 BeringStrait_2021_A4_02232ADCPdeploytests.txt 14173821 BeringStrait_2021_A4_02232ADCPraw.000 27306 BeringStrait_2021_A4_02232ADCPrecoverytests.txt 3725832 BeringStrait_2021_A4_02232_bin01.rdat 3725832 BeringStrait_2021_A4_02232_bin02.rdat 3725832 BeringStrait_2021_A4_02232_bin03.rdat 3725832 BeringStrait_2021_A4_02232_bin04.rdat 3725832 BeringStrait_2021_A4_02232_bin05.rdat 3725832 BeringStrait_2021_A4_02232_bin06.rdat 3725832 BeringStrait_2021_A4_02232_bin07.rdat 3725832 BeringStrait_2021_A4_02232_bin08.rdat 3725832 BeringStrait_2021_A4_02232_bin09.rdat 3725832 BeringStrait_2021_A4_02232_bin10.rdat 3725832 BeringStrait_2021_A4_02232_bin11.rdat 3725832 BeringStrait_2021_A4_02232_bin12.rdat 3725832 BeringStrait_2021_A4_02232_bin13.rdat 3725832 BeringStrait_2021_A4_02232_bin14.rdat 3725832 BeringStrait_2021_A4_02232_bin15.rdat 3725832 BeringStrait_2021_A4_02232_bin16.rdat 3725832 BeringStrait_2021_A4_02232_bin17.rdat 3725832 BeringStrait_2021_A4_02232_bin18.rdat 3725832 BeringStrait_2021_A4_02232_bin19.rdat 3725832 BeringStrait_2021_A4_02232_bin20.rdat 3725832 BeringStrait_2021_A4_02232_bin21.rdat 3725832 BeringStrait_2021_A4_02232_bin22.rdat +++++++++ END OF FILE LISTING ++++++++++++++++++++++++++++++