Vessel: R/V Knorr
Institution: WHOI
Cruise: KN213-02
Start Port: Nuuk, Greenland
End Port: Nuuk, Greenland
Chief Scientist: Jason Gobat / Craig Lee UW/APL
Project: Davis Strait
Area: Davis Strait
Master: Kent Sheasley
SSSG: Amy Simoneau, Dave Sims

Notes:

There is a lag in GYRO data in the /underway/proc directory up until 1809 on 18 September 2013.
Gyro values are used in the calculation of true wind speed and direction, causing errors in 
these data as well.  Gyro data in the /raw directory is accurate and can be used for recalculating
true winds during the first four days of the cruise.   

There were a significant amount of additional sensors on the MET mast for the cruise following
this one.  These presented obstructions to Knorr's existing sensors such that during some
wind conditions and some headings, the port and starboard Vaisala WXT520 wind data diverge 
significantly between the sensors.  The port sensor usually experience less effects than the starboard
sensor and if the two are plotted together it is reasonably obvious which has inaccuracies.

The science salt water pump lost it's prime and ceased or slowed flowing on 19 Sept between 1340 and 
1430 GMT as well as 20 Sept between 1345 and 1830 GMT.  Salinity data did not show as much of a 
problem during the second time frame (20 Sept) except from 1630 to 1730 GMT. This affects The SBE45 
instrument (surface salinity), the fluorometer, and sea surface sound velocity (fed to seabeam).  

The CTD had problems due to a bad pumps wye cable.  The problem affected oxygen data the worst, but 
also the primary temperature and conductivity data with rare but occasional secondary sensor issues. 
The problem was not noticed right away, difficult to diagnose and was exacerbated by the fact that 
it did not show up in casts shallower than 500-600m.  A more thorough explanation is located in the 
CTD directory.  This problem was not solved until cast 127 and affected roughly one third of CTD casts.    

SSSG R/V Knorr