CalCOFI 0808NH CTD Cast & Data Processing Notes

Overall, the majority of issues with sensor data was with the ISUS Nitrate sensor. Powering the sensor requires connecting a
12v external battery pack. At this time, CalCOFI was using a battery pack for three casts (~3hrs) then replacing the pack with
a fresh pack. There were also some cabling issue that was resolved early in the cruise by replacing a faulty battery cable.

Casts with no ISUS data: 005U, 007UD, 009UD, 010UD, 011UD, 012UD, 013U, 016U, 024UD, 030UD, 034UD, 035U, 054U

Casts with partial ISUS profile data: 005D, 013D, 016D, 020UD, 024D, 035D, 054D

Dave Munro was conducting a productivity experiment which required additional seawater so extra surface or 10m bottles were closed on many casts this cruise.

Cast 001: bottle #9 mistripped, no sample
Cast 002: extra bottles tripped at surface to test carousel and mistrip #9 from last station
Cast 004: bottle #9 did not close again 
Cast 005: trigger #9 replaced; ISUS stopped logging on downcast ~490m, no upcast ISUS data
Cast 009: no ISUS data, battery?
Cast 010: new battery but still no ISUS data - bad cable?
Casts 011-012: still no ISUS data, plugged in
Cast 013: new ISUS battery, work on downcast to 310m, nothing deeper or on upcast
Cast 014-015: ISUS worked down & upcast
Cast 016: ISUS worked on downcast to 230m
Casts 017-019: ISUS worked fine
Cast 019: salinity differs a bit on upcast from downcast
Cast 020: ISUS worked on downcast to 385m, & on upcast 222m-0m
Casts 021-023: ISUS worked fine
Cast 024: ISUS worked on downcast to 484m, no upcast data
Casts 025-029: ISUS worked okay
Cast 030: no ISUS data
Cast 031: do over, odd message "FFFFFFF unsupported modem message" in file acquisition box; first cast to ~280m then back to surface and restarted, resent to 515m without issue; ISUS worked fine
Casts 032-033: ISUS worked fine
Cast 034: Santa Monica Basin station; battery dead, no ISUS data 
Cast 035: ISUS data on downcast to 75m
Cast 036: Rosette frame cracked post-cast (while on deck); ISUS okay
Casts 037-038: ISUS looks okay
Cast 038:  lanyard #21 broke, possible mistrip at 8m, 23 bottle prodo cast
Casts 039-040: ISUS okay; rough seas
Cast 041: salinity inversion noted; O2 lower at surface than 50m; ISUS okay
Casts 042-043: ISUS good, battery swapping working better
Cast 044: didn't start archiving, brought back to surface then data archiving started
Cast 045: ISUS Okay
Casts 046-047: bottle #10 mistripping, lowered bottle and shortened lanyard after cast 047
Cast 048: ISUS okay
Cast 049: CTD yo-yo'd @120m, went back to 140m for mkr
Cast 050: bottle #10 seems okay now
Cast 051-053: ISUS okay
Cast 054: Santa Barbara Basin station, ISUS on downcast to 543m, but lost the rest
Casts 055-064: ISUS okay, moderate-heavy seas
Cast 065: ISUS okay; big rolls, slow cast with some pauses on up & downcast for big swells
Cast 066-069: ISUS okay

Note: continual problems with powering the ISUS resulted in a new protocol. The ISUS battery was charged after every deep cast without removing it from the rosette. A long charging cable was rigged so it was not necessary to swap the heavy batteries. Occasional venting of charging gases were necessary by unplugging the battery case at least once a day.