# NOTES FROM SURVEY CRUISE SUB-GROUP (25 MAY)

## First U.S. Southern Ocean GLOBEC Science Investigator Meeting
Arlington, VA
25-26 May 2000

## Survey Cruise Objectives

Purpose of the survey work is: 1) to map the distribution and abundance of krill, their prey field, and predators, 2) to map the hydrography and current structure in the survey area to provide a context for interpreting the biological distributions and their coupling to the environment, and 3) to conduct coordinated smaller scale studies with the process group of krill and their physical/biological environment. Although Marguerite Bay is central to the broad-scale survey work, the cruise track will be determined in part by the presence/absence of ice and adjustments may have to be made to extend the survey further south during the fall cruise to reach an ice-edge region.

### On Station Activities during a survey

Primary Work:

- CTD profile to bottom
- XBT
- Turbulence Profile
- MOCNESS tow (~16 stations)
- ROV profile (@ MOCNESS stations)
- SONA buoy deployment (when last out of range)
- Deploy Drifters when in ice free region
- Ice core when in ice.
- Penguin stomach contents when in ice and penguins present.

Other work:

- Repeat work at some stations on grid.
- Coordinated ship work - fine-scale surveys
- Krill/MOCNESS/Lighting avoidance study.
- ROV light quality experiment
- Shelf water intrusion Experiment
- Run Shipboard models - Data assimilation - produce nowcast.

Cruise Participants:

    	Group			Number in Group		Activity

    Broad-scale mapping

    Ashjian/Davis/Gallager/Wiebe	9(6)		BIOMAPER II, MOCNESS, ROV

    Powell				2		turbulence profile (every CTD Station?)

    Padman 				1		CTD, XBT

    ODU				1

    Beardsley			1

    Hildabrand

    	acoustics		2		SONA buoy marine mammal sounds

    	IWC			2		(3-10/day), Marine mammal sightings

    Ribic				2		Marine seabird sightings

    Fritzen				(1-2)		Ice Cores when in Ice Zone (2 hrs/core)

    Fanning				2		CTD-Nutrients

    Vernet				2		CTD-Productivity

    Process/other

    Torres				4		Physiology/biochemistry/small-scale

    Daly				4		process studies

    Zhou				2

    Comiso				1?		July-Aug overflights coordination on 2nd cruise.

    Total bunks needed - max (min)	37 (32)

Note: The reduction in 3 bunks indicated for Ashjian et al., can occur if a marine tech is present in the BIOMAPER II van to assist in "flying" BIOMAPER II on each watch.