README FILE FOR BERING STRAIT MOORING DATA                      December 2012
=============================================================================
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Bering Strait Moorings 2009-2010

This is an archive of data from moorings deployed in Bering Strait from
summer 2009 to summer 2010.

Mooring deployments were funded by the NOAA RUSALCA (Russian-US Long Term 
Census of the Arctic) program.  

The mooring work required 2 dedicated cruises:
- in 2009 (23rd Aug - 2nd Sept), a ~ 10 day cruise on the Russian vessel 
Khromov deployed the moorings.  Some CTD sections were run on this cruise, 
and these data are archived separately.  (Note that this cruise also 
recovered similar moorings, under NSF-IPY funding.)
- in 2010 (31st July - 11th Aug), a ~ 11 day cruise on the Russian vessel 
Khromov recovered the moorings.  Some CTD sections were run on this cruise, 
and these data are archived separately.  (Note that this cruise also 
deployed similar moorings, under NSF-AON funding.)

For 2009 to 2010, a total of eight moorings were deployed:
- three moorings (A1W, A1, A1E, also called A12, A11 and A13)
in the Russian channel of the Strait
- four moorings (A2W, A2, A4W, 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.  

Sites A1, A2, and A3 were established in 1990. A2 and A3 have been occupied 
almost continuously (all years except 96-97) since then. A1 was occupied for 
a few years from 1990,(90-91, 92-94) and then again since 2004.  Site A4 
was established in 2001. Sites A1E and A1W were established in 2005, and 
also carry Russian instrumentation not included in this archive (although 
documented in the cruise reports and here).
Sites A2W and A4W were established in 2007.     

Mooring location A1 (also called A1-1) is in the middle of the western 
(Russian side) channel.  Mooring location A1W (also called A1-2) is
between A1 and the Russian coast.  Mooring location A1E (also called
A1-3) is between A1 and the Diomede Islands, which divide the strait.  
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 Alaska 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  
--------------------------------------------------------------------------
A1W-09 2009  65 55.99  169 37.00  ISUS*           088    -     33m    51m    
(A1-2)                            SBE16+         4639  60min   33m    51m    
                                  RCM9            636  60min   38m    51m    

A1-09  2009  65 54.00  169 25.98  ISCAT          7110   5min   16m    51m  
                                  ISCAT-Logger      5  30min   ...    51m
                                  600kHz-ADCP   11698 30&60min 44m    51m
                                  SBE37 Microcat 5361  15min   44m    51m 

A1E-09 2009  65 52.00  169 16.99  AARI-CM&CTD*     50    -     31m    51m   
(A1-3)                            RCM9Turb       1173  60min   33m    51m    
                                  SBE37 Microcat 4835  15min   35m    51m   

A3-09  2009  66 19.60  168 57.93  ISCAT          7111   5min   16m    56m  
                                  ISCAT-Logger      2  30min   ...    56m
                                  300kHz-ADCP    1075  30min   46m    56m
                                  SBE37 Microcat 4836  15min   46m    56m
                                  WhaleRecorder*  128          48m    56m

A2W-09 2009  65 48.06  168 47.96  ISCAT          5468   5min   18m    52m  
                                  ISCAT-Logger      4  30min   ...    52m
                                  300kHz-ADCP    9396  30min   43m    52m
                                  SBE16          0005  60min   47m    52m 
                                  WhaleRecorder*  129          48m    56m
                                  SBE26p-BPG     1135  30min   50m    52m 

A2-09  2009  65 46.87  168 34.04  ISCAT          7112   5min   17m    57m  
                                  ISCAT-Logger      1  30min   ...    57m
                                  300kHz-ADCP   12845  30min   45m    57m
                                  SBE16+         4154  60min   48m    57m
                                  ISUS*           098    -     48m    57m        

A4W-09 2009  65 45.42  168 21.94  ISCAT          7113    NR    17m    54m  
                                  ISCAT-Logger      3  30min   ...    54m
                                  300kHz-ADCP    2332  30min   42m    54m
                                  SBE16          0007  60min   45m    54m 

A4-09  2009  65 44.76  168 15.75  ISCAT          7114   NR     15m    49m  
                                  ISCAT-Logger      6  30min   ...    49m
                                  300kHz-ADCP    9397  30min   39m    49m
                                  SBE16          1698  60min   42m    49m 
                                  SBE26p-BPG     1134  30min   47m    49m 
--------------------------------------------------------------------------
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:
 300KHz-ADCP - 300kHz RDI/Teledyne Workhorse Acoustic Doppler Current Profiler
 SBE37 Microcat - Seabird SBE 37 Temperature Salinity Pressure recorder
 SBE16+ - Seabird SBE16plus 
 SBE26p-BPG - Seabird SBE26plus Bottom Pressure Gauge
 RCM9Turb - Aanderaa RCM9 acoustic current meter with turbidity sensor
 RCM9   - Aanderaa 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
 WhaleRecorder - Passive Acoustic Whale 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. 
   Turbidity data from the RCM instrument are included in this archive, 
although only minimal quality control of the data has been performed.
   The SBE16plus BPG also recorded wave burst data - this may be extracted
from the .hex files included in this archive, but has not been processed here.

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-26 hexidecimal files (unaltered from the download) are also 
included, indicated by extension .hex.

For the ADCPs, there are multiple files per instrument.
   BeringStrait_yyyy__ID_#####ADCPraw.000 = Binary download from the ADCP
     (note there are sometimes two files for the ADCP - see notes below)
   BeringStrait_yyyy__ID_#####_ADCPdeploytests.txt = pre deployment tests
   BeringStrait_yyyy__ID_#####_ADCPrecoverytests.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)
   BeringStrait_yyyy__ID_#####mbin01.rdat = ASCII data from re-averaged Bin 1
   BeringStrait_yyyy__ID_#####mbin02.rdat = ASCII data from re-averaged 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:
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.
Aagaard, K., T.J.Weingartner, S.L. Danielson, R.A. Woodgate, G.C.Johnson,
   T.E.Whitledge (2006), Some controls on flow and salinity in Bering Strait,
   Geophys. Res. Lett., 33, L19602, doi:10.1029/2006GL026612.
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., in press.

For an overview, please see:
   http://psc.apl.washington.edu/BeringStrait.html

For queries, please contact:
   Rebecca Woodgate   woodgate@apl.washington.edu   (206) 221-3268
   Polar Science Center, Applied Physics Lab, University of Washington
   1013 NE 40th, Seattle, WA  98105-6698   USA      FAX (206) 543-6785

------------------------------------------------------------------------------

Meta data
=========

1) Platform: Subsurface oceanographic moorings

2) Project title: Bering Strait

3) Data collection dates: summer 2009 to summer 2010

4) PI:   Rebecca Woodgate (woodgate@apl.washington.edu)
         Tom Weingartner (weingart@ims.uaf.edu)

5) Data collection method:
     Year-round moorings carrying
     - Aanderaa recording current meters (RCM)
     - Sea-Bird temperature/conductivity and pressure recorders (SBE)
     - RDI 300kHz and 600 kHz Workhorse Acoustic Doppler Current Profilers (ADCP)

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 RCMs and SBEs, calibration coefficients are given in header file.
 
  RCMs:   
     - Predeployment calibrated by the manufacturer (AA),
     - pre-calibration used for data reduction.
     - where indicated in the headers, direction has been corrected by lookup
       table rather than fitted polynomial
     - direction corrected to true north, magnetic declination used is
       cited in the header
     - RCM9 data has been corrected for the temperature/pressure variability
       of the speed of sound using temperature data from the RCM

  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
     
  ADCPS:  Tested by APL/UAF/manufacturer pre deployment.
     - A2W, A2, A4W, A4 compasses calibrated as per manufacturer's
       specifications in Seattle prior to deployment.  Estimated 
       compass error is included in the header file
     - A1 and A3 ADCPs may have batteries exchanged at sea and thus
       compass calibration may be poor - see headers
     - 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)
     Aanderaa current meters RCM-9 (one with optics sensor)
     Sea-Bird SBE26plus recorders
     Sea-Bird SBE16 recorders
     Sea-Bird SBE16plus recorders 
     Sea-Bird SBE37 recorders
     ISCAT loggers (SBE37 Microcat logging data to an APL-Logger)
     RDI 300 or 600 kHz Workhorse ADCP - bin size either 2m or 1m.
       (if the latter, .000 data is at original bin size, and
        extracted data averaged onto 2m bins).

8) Quality control procedures:
     Quality control provided by Rebecca Woodgate.
     RCM and SBE data checked against each other where possible.
     RCM-9 measurements of water velocity depend on the speed of
       sound in water.  The manufacturer's default is to assume
       a sound speed of 1500 m/s.  In data processing, we use
       RCM temperature and mooring information of instrument depth to
       obtain a more accurate speed of sound at the RCM during
       deployment, and thus recompute the water velocity (Cor Speed).
     RCM optical data is not quality controlled and should be treated
       with caution.
     ADCP data rely on ADCP internal temperature for speed of sound
       corrections.
     ADCP on A1 and A3 recorded in 1m bins. This archive contains the
       original binary file of this data (without correction for magnetic
       declination).  For the ascii files in this archive (which are
       corrected for magnetic declination), these data are averaged onto  
       2m bins to match other deployments. 
     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:
     RCM and SBE data - ASCII, format given in individual headers
        (uncalibrated "hex" data also included for SBE26p)
     ADCP data - 2 formats: a) BINARY download file from ADCP and 
                            b) ASCII conversion of these files (in 2m bins)

10) Data collection problems:  (Only major issues
    recorded here.  Fuller details given in file headers.)
    By Mooring:
      - the 2009-2010 moorings were somewhat biofouled on recovery
      (photographs of this are included in the archive).  In the
      case of mooring A2W, this likely prevented the successful
      firing of the first release, but the mooring was successfully
      released by the second release of the mooring. 
      Optics data is likely contaminated by this biofouling and should
      be treated with caution.
    
    By Instrument:
    === RCMs
      A1W09_rcm9_636 
        - true temperature calibration not available.
        Thus, average temperature calibration used, adjusted to
        match the overlying SBE during the times of freezing.
        Error introduced < 0.1 deg C, likely < 0.05 deg C
        - tilt and signal strength only nominally calibrated
      A1E09_rcm9_1173 
        - instrument leaked, but continued recording
        - salinity data highly erroneous, fixed salinity used
        for speed of sound calculation
        - turbidity, tilt and signal strength only nominally calibrated

     === SBE26p (Bottom Pressure Gauge and Wave Recorder)
       A2W09_1135
       A409_1134
         - .hex files contain unprocessed wave burst data
       (processing software SeasoftforWaves included in archive)
         - converted pressure data show no obvious problems

    === SBE16
       A1W09_4639
         - only pre cruise calibration available
         - battery exhausted on recovery
         - partial failure of pressure sensor
       A2W09_0005
         - 0.03 psu salinity different pre-post calibrations
         - unresolved issue on timing may result in 1hr time
         uncertainty in data
       A209_4154
         - only pre cruise calibration available
         - battery exhausted on recovery
         - partial failure of pressure sensor
       A4W09_0007
         - 0.03 psu salinity different pre-post calibrations
       A409_1698
         - 0.03 psu salinity different pre-post calibrations

      === SBE37s (non-ISCAT)
       A109_sbe5361 
         - only precal available
       A1E09_sbe4835 
         - only precal available
       A309_sbe4836
         - only precal available

    === ISCATS (Loggers and SBE37s)
       A109  - SBE37 5361 - recovered, data ok  % NOTE is 7110, no 5361
             - Logger 5 - stopped recording in Oct 2009
                likely due to battery issue
       A309  - SBE37 7111 - recovered, data ok 
                    (clock correction required)
             - Logger 2 - stopped recording in Oct 2009
                likely due to battery issue
       A2W09 - SBE37 5468 - recovered, data ok
             - Logger 4 - stopped recording in Dec 2009
                likely due to battery issue
       A209  - SBE37 7112 - recovered, data ok 
                    (clock correction required)
             - Logger 1 - stopped recording in Nov 2009
                 likely due to battery issue
       A4W09 - SBE37 7113 - lost after Nov 2009 and before recovery
             - Logger 3 - stopped recording in Nov 2009
                likely due to battery issue, but possibly due to
                iscat loss
       A409  - SBE37 7114 - lost after Nov 2009 and before recovery
             - Logger 6 - stopped recording in Nov 2009
                likely due to battery issue, but possibly due to
                iscat loss

   === ADCPs
      A109_adcp11698
         - stopped after ~ 1month in water, and restarted ~ 2 days
         later using different plan and no bottom tracking, with
         a reset of the clock to 1994, and loss of compass calibration.
         2 sets of files recorded here. See file headers.
         - original 1m data in first part of record, reaveraged to 
         2m bins for ascii files
      A309_adcp1075
         - battery likely exchanged at sea so compass calibration
            unreliable
         - original 1m data, reaveraged to 2m bins for ascii files
         - data good to bin 16-19 (12-6m)
      A2W09_adcp9396
         - instrument stopped itself during deployment, but restarted
         on same plan 2 hrs later
         - bin 1 has large velocity errors
         - bin 8 has iscat contamination
         - some large (>20deg) tilt events
         - data good to bin 15
      A209_adcp12845
         - bin 1 has large velocity errors
         - some large (>20deg) tilt events
         - data good to bin 15
      A4W09_adcp2332
         - bin 1 has large velocity errors
         - bins 8 and 9 has iscat contamination
         - some large (>20deg) tilt events
         - data good to bin 13
      A409_adcp9397
         - bin 1 has large velocity errors
         - some large (>20deg) tilt events
         - data good to bin 14

      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.

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.
       For details see
        http://psc.apl.washington.edu/BeringStrait.html
        http://www.eol.ucar.edu/projects/sbi/
        http://sbi.utk.edu/
        http://www.nodc.noaa.gov
       Since 2000, CTD sections have been run in the Bering Strait on
       the mooring cruises.  This data is 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

13) Data qualifications or warnings:
       See also Data collection problems.
       The temperature (T) and conductivity (C) recorded by a RCM are
       significantly less accurate than those recorded by a SBE.  In most
       instances, a SBE was located very close to a RCM, so that the former
       would provide the record of choice for T and C even when the RCM
       measured both parameters. For data issues relevant to a specific
       deployment, see the individual headers.  In general:
       RCM data: Standard Aanderaa limitations apply
            - estimated accuracy 2 cm/s in speed, 5 deg in direction,
              0.05 deg C in temperature, >= 0.01 S/m in conductivity
              (corresponds to >= 0.2 psu in salinity).
       SBE data: Standard Sea-Bird limitations apply
            - estimated accuracy 0.02 deg C, 0.0012 S/m
              (corresponding to 0.02 psu), and < 1 db.
            - see header files for difference between pre and post 
            calibration which indicate change of between 0.02 and 0.1 psu.
            This should be taken into account when using data from 
            instruments with no post-cruise calibration.
       SBE26plus data: Standard Sea-Bird limitation apply
            - estimated accuracy 0.01 deg C, 0.01% of full scale 
            (for these deployments, range 60db, thus accuracy 0.006db)
       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
       Optical Sensor Data:
              These unmodified records are included, although no quality
              control of the data has been performed, as noted in the
              header files.  This leaves final judgments about record quality
              to the user.

14) Grant numbers:
      Mooring sponsorship came from 
      - NOAA Arctic Research RUSALCA - Russian-US Longterm Census
          of the Arctic: http://www.arctic.noaa.gov/aro/russian-american/

15) Sample repository locations:
        National Ocean Data Center (http://www.nodc.noaa.gov)
        University of Washington (http://psc.apl.washington.edu/HLD)
==============================================================================
FILE LISTING
=============
Total number of files: 
   Main directory:  35 files and 5 subdirectories

  Size (kb) Name
  -------  ----
= Metadata file (1 file)
   44    Bering_Strait_Moorings_RUSALCA_09to10_ReadMe.txt

= cruise reports (2 files)
 4088    UWmooringreportKhromov2009_versOct09.pdf
 4144    CruiseReportKhromov2010wEL_verNov11.pdf

= RCM (2 files)
  852    BeringStrait_2009_A1E_rcm9_1173.pre
  724    BeringStrait_2009_A1W_rcm9_636.pre

= SBE26plus - Bottom Pressure and Wave Recorder (4 files)
  - 2 .hex files of raw data   
  - 2 .ppp files of pre-post calibrated Pressure and Temp
10208    BeringStrait_2009_A2W_sbe26p_1135.hex
 1156    BeringStrait_2009_A2W_sbe26p_1135.ppp
10208    BeringStrait_2009_A4_sbe26p_1134.hex
 1156    BeringStrait_2009_A4_sbe26p_1134.ppp

= SBE16 (5 files)
  - 3 .ppp files of pre-post calibrated data
 - 2 .pre files of pre-cruise calibrated data
  648    BeringStrait_2009_A1W_sbe16_4639.pre
  684    BeringStrait_2009_A2W_sbe16_0005.ppp
  684    BeringStrait_2009_A2_sbe16_4154.pre
  684    BeringStrait_2009_A4W_sbe16_0007.ppp
  684    BeringStrait_2009_A4_sbe16_1698.ppp

= SBE37 Microcat  (3 files)
  - 3 .pre pre-cruise calibrated data
 2752    BeringStrait_2009_A1E_sbe37_4835.pre
 2752    BeringStrait_2009_A1_sbe37_5361.pre
 2760    BeringStrait_2009_A3_sbe37_4836.pre

= ISCAT data (10 files)
  -  6 ICLog*.pre of pre calibrated logger data
  -  4 ICsbe37*.ppp pre-post calibrated SBE37 data
  208    BeringStrait_2009_A1_ICLog05_7110.pre
  444    BeringStrait_2009_A2W_ICLog04_5468.pre
  280    BeringStrait_2009_A2_ICLog01_7112.pre
  248    BeringStrait_2009_A3_ICLog02_7111.pre
  256    BeringStrait_2009_A4W_ICLog03_7113.pre
  272    BeringStrait_2009_A4_ICLog06_7114.pre

 8276    BeringStrait_2009_A1_ICsbe37_7110.ppp
 8328    BeringStrait_2009_A2W_ICsbe37_5468.ppp
 8324    BeringStrait_2009_A2_ICsbe37_7112.ppp
 8324    BeringStrait_2009_A3_ICsbe37_7111.ppp

= Photos of mooring recovery biofouling (8 files)
  156    BeringStrait_A109_Recoveryphotos2010.jpg
  168    BeringStrait_A1E09_Recoveryphotos2010.jpg
  216    BeringStrait_A1W09_Recoveryphotos2010.jpg
  224    BeringStrait_A209_Recoveryphotos2010.jpg
  200    BeringStrait_A2W09_Recoveryphotos2010.jpg
  160    BeringStrait_A309_Recoveryphotos2010.jpg
  268    BeringStrait_A409_Recoveryphotos2010.jpg
  228    BeringStrait_A4W09_Recoveryphotos2010.jpg

5 subdirectories of ADCP data 
   32    BeringStrait_2009_A1_adcp11698
    8    BeringStrait_2009_A2W_adcp9396
   16    BeringStrait_2009_A2_adcp12845
   12    BeringStrait_2009_A3_adcp1075
    8    BeringStrait_2009_A4W_adcp2332
    8    BeringStrait_2009_A4_adcp9397

Within each subdirectory:
- one or more .000 files (original downloads)
- one or more .txt files of deployment/recovery tests
- one .btm file of bottom track data
- one .ins file of instrument data
- several .rdat files of data from each ADCP bin.
mbin indicates averaged to 2m bins
11698 wrote 2 files with different plan settings,
and these are archived as A and B. Note that for B
there is no bottom track data. 
