Southern Ocean GLOBEC pre-cruise meeting
9 January 2001
Process cruise April/May – ca 10 h light
PI Task Time Repeated
Costa/Burns Crabeater seals 2-6 h 7x per cruise
Fraser Penguins 6 h 15x per cruise
Ice stations/opportunistic, no open water stops
Fritsen CTD in open water 1 h 1/d
CTD in ice 1 h 1/d
Ice station 3-4 h 1/d
Requested 10L bottles for CTD
Sample forming grease ice/frazil ice w/ buckets
Vernet?
Zhou ADCP survey 20 km box 24 h 2x per station
1m MOCNESS 4 h 2x/d
Daly HTI acoustic tow w/ ADCP (tow speed too slow?)
HTI towed w/ net tows as possible
HTI drift 0.5 h 1/d
HTI on station as possible
Live net tows 1 h 2/d
Torres 10 m MOCNESS 3 h 1/d (5/sta)
Dive 4 h 1/d
Meat tow 1 h 1/d
UW/nutrients CTD
Perovich ARGOS drifter on floe (Sta 5?)
+ CTD survey 3-6 h 1x/cruise
Data loggers
Total time open water, 5 d per station
2 ea ADCP 48 h
5 ea CTD 5 h
5x-2 ea/d MOC 1 20 h
5x – 1 ea/d MOC 10 15 h
5 x live nets (2) 10 h
5 x meat tows 5 h
2 x diving 8 h
Total 111 h = 4.5 d
Total time ice station, 5 d per station
Day operations:
Seals 6 h
Penguins 6 h
Dives 6 h
Ice 6 h
CTD/optics noon
Night operations:
ADCP 1 d - 24 h survey- predator survey, get predator info from Polarstern
MOC-1 8h
MOC-10 3h
Live nets 3h
HTI drift 1h
15 h other work
6 h for "day" work
21 h
15 d ice sta (3 x 5) [Jose you had 18 d on the board instead of 15 d, not sure why now…]
10 d open water (2 x 5)
25 d on sta
+ 3 – 4 d transit
= 28 science days, 4 d for weather + additional work
Station location/procedures
(1) Obtain predator/prey information from Polarstern and penguin satellite positions for general area,
Process station site criteria We should continue to discuss these locations
Sta 1 – Objective to sample shelf, shelf break, and off shelf communities (ACC)
1000 m isobath (ca 200 km offshore ?)
The August process group objected to a station so far off-shore and argued for the station to be located nearer shore where they would be more likely to find ice in Aug. We agreed to have a Sta. 1a and 1b. Sta 1b will be directly shoreward of Sta 1a. Fritsen will collect water samples for microbial biology at both locations (6 h stop).
The August process group would like to investigate different ice types and to relocate same ice where drifter was deployed in April/May in order to examine the temporal evolution of ice conditions. L. Quetin would like 3 ice stations, 75-100 km apart, reoccupying 2 sites in 7/10 – 10/10 rafted pack ice.
Sta 2 – Objective to sample canyon effects on hydrography, prey and predators. Approximately in axis of canyon.
Sta 3 – Objective to sample perennial pack ice, highest probability of finding early forming sea ice. (R. Smith - Buoys deployed in June at ca. Sta 3 didn’t move beyond 6 km for 1.5 m; C. Fritsen didn’t think that ice maps indicated perennial ice at this location.)
Sta 4 – Objective to sample fast ice and deep into Marguerite Bay?
Sta 5 –Objective to sample large predator aggregations. The site of this station was especially questioned. D. Costa said that Sta. 5 was located to be in the vicinity of Deone Is (sp?) which had seals and penguins. Aggregations of seals and penguins during winter were sited approximately at the intersection of Sta. 2 and 5 boxes.