README FILE FOR 2015 BERING STRAIT CTD DATA             Version July 2015
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This is an archive of CTD data from the 2015 Bering Strait mooring cruise.

The cruise was funded by the NSF-Arctic Observing Network grant:
- PLR-1304052 (PIs: Woodgate, Heimbach and Nguyen)

The data are from a ~ 9 day cruise 
- on the US vessel Norseman II 
- from 1st-9th July 2015 
- sailing from and to Nome, Alaska, USA 
- to the Bering Strait and southern Chukchi Sea.
The cruise was also to service oceanographic moorings in the strait and those
data are archived separately. 

A total of 258 casts were taken and are included in this archive.
No water samples were taken during this cruise. 
Stations were taken in US waters near mooring locations and on sections
in the Bering Strait and southern Chukchi Sea.  See cruise report for
map, station locations, calibration, and processing details. 

The data are taken using an SBE911p system, recording 
- pressure 
- temperature (dual system)
- conductivity (dual system)
- oxygen (dual system)
- fluorescence
- turbidity.

For an overview of previous and on-going Bering Strait mooring work,
please see http://psc.apl.washington.edu/BeringStrait.html.

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

Please cite that reference for the data. 

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

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Meta data
=========

1) Platform: SBE911p CTD system on board the RV Norseman II

2) Project title: Bering Strait

3) Data collection dates: 1st9th July 2015

4) PI:   Rebecca Woodgate (woodgate@uw.edu)

5) Data collection method:
     Hydrographic casts (no water samples)

6) Data calibration method:
     Instrument calibrated by manufacturers prior to deployment.
        Pressure calibrated March 2015
        Temperature calibrated March 2015
        Conductivity calibrated March 2015
        Oxygen calibrated March 2015
        Fluorescence / Turbidity calibrated  March 2010
     All times are given in GMT.
     All positions and times are from ship's aft A-frame NMEA.
     For SBEs, calibration and processing details are in file header.

7) Instrumentation used:
     Sea-Bird SBE911p system sampling at 24Hz with
         two SBE3F temperature sensors
         two SBE4C conductivity sensors
         two SBE43 Oxygen sensors
         one Wetlabs FLNTURT fluorescence/turbidity sensor
         one Benthos altimeter (data only intermittently reliable)
         two SBE pumps

8) Quality control procedures:
     Basic quality control provided by Rebecca Woodgate.
     CTD processing by SBE software as described in cruise report and file headers. 
     Fluorescence/turbidity sensor cleaned prior to each cast. 

9) Data format:
     BStrait15nnn.hex data - as collected
     BStrait15nnn.XMLCON - calibration coefficients
     BStrait15nnnA00B15AdvOx2CTML5m2m6mDMF17 
                         - processed data (at native time resolution)
     BStrait15nnnA00B15AdvOx2CTML5m2m6mDMF17BADCS010 
                         - processed data averaged to 1m bins from downcast
     nnn gives cast number
     Time (GMT), Latitude and longitude are recorded in the data files	
      
10) Data collection problems:
	Generic:  - the Benthos altimeter only returned believable data for some casts.
       Thus water depths should be taken from the event log in the cruise report.
      Pump on primary system failed for cast 71-82 inclusive.  Thus for these casts, 
              primary sensor data are incorrect.
      Vent plug on primary systems appears to have been blocked for casts 131-155.  
              Thus for these casts, primary sensor data are incorrect.


11) Other related data sets:
       This data set is a part of a suite of 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.  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, 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

13) Data qualifications or warnings:
       See also Data collection problems.
       SBE data: Standard Sea-Bird limitations apply
           - pressure 0.015% of FSR (6800m), i.e., ~ 1m (calibration suggests 0.6m)
           - temperature 0.001degC
           - Conductivity 0.0003S/m
               Combined errors equivalent to salinity error of ~0.008psu

14) Grant numbers:
      Work funded by:
      - National Science Foundation (NSF) Arctic Observing Network (AON)
      program, grant PLR-1304052 (PI: Woodgate, Heimbach and Nguyen)

15) Sample repository locations:
        National Ocean Data Center (http://www.nodc.noaa.gov)
        University of Washington (http://psc.apl.washington.edu/HLD)

16) Please use the following citation 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

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FILE LISTING
=============

Total number of files:  1034 files and 3 subdirectories.
Total number of casts: 258

Size (b)   Name
---------  ----
= Metadata file (1 file)
     7918  Bering_Strait_CTD_July2015_NSFAON_ReadMe_versJuly2015.txt

= Cruise report (1 file)
  9759216  BeringStrait2015CruiseReport_Norseman2_31stJuly2015_withBlogandEL.pdf

.. and the 3 subdirectories: 

== One subdirectory of SBE .hex and .XMLcon calibration files (516 files)
./BeringStraitCTD_hexandXMLCON:
BStrait15nnn.hex and BStrait15nnn.XMLCON where nnn is cast number, e.g.,
 436028 Jul  2  2015 BStrait15001.hex
   9372 Jul  2  2015 BSTRAIT15001.XMLCON

== One subdirectory of processed data at native time resolution (258 files)
./BeringStraitCTD_processed:
BStrait15nnnA00B15AdvOx2CTML5m2m6mDMF17.cnv where nnn is cast number, e.g.,
 1507262 Jul  8  2015 BStrait15001A00B15AdvOx2CTML5m2m6mDMF17.cnv

== One subdirectory of processed data at averged to 1m bins from the down cast (258 files)
./BeringStraitCTD_Binaveraged:
BStrait15nnnA00B15AdvOx2CTML5m2m6mDMF17BADCS010.cnv where nnn is cast number, e.g.,
   26016 Jul  8  2015 BStrait15001A00B15AdvOx2CTML5m2m6mDMF17BADCS010.cnv


+++++++++ END OF FILE LISTING ++++++++++++++++++++++++++++++ 