CTD and water sampling

Some notes on the CTD casts performed during the cruise LTES1-10  on the R/V Mariagrazia.

Overall notes:

• most of the cast do not have the top 3/5 meters
• the ship didn't have a NMEA system so the timing and position of each cast had to be manually given to the acquisition program
• the bottom depth was not acquired during the casts and on the probe was not mounted an altimeter. Anyway all the cast were performed to get as close to the sea floor as possible (usually about 1 m)
• each cast can be identified in tow ways:
• a station name (based on previous cruises) that identity the historical position
• a file name (a progressive number) that define the cruise station number.

CTD station notes (here the casts are identified by file name):

• 001: longitude and latitude in the header file are switched
• 013: the cast was done 2 nm east of the planned point (station name 068).
• 017: the down cast was done with an high descent rate
• 021: the cast was repeated on the same position after a very short time due to not acquisition of the first cast
• 038: the cast was repeated on the same position after a very short time due to not acquisition of the first cast
• 046: in the header file the cast is located 45N instead of 44N
• 047: the weight attached to the probe touched the sea floor. After the cast the probe was cleaned with distilled water. This seems to have caused any problems to the sensors.
• 056: the cast was done with a very slow speed
• 057: the cast was not saved in an .hex file
• 102: the weight attached to the probe touched the sea floor. After the cast the probe was cleaned with distilled water. This seems to have caused any problems to the sensors.

Figure 22: CTD data(T,S,SV), cruise LTES1-10.

Figure 23: CTD data(T,S,SV), cruise LTES1-10.