JR177Discovery 2010 Summer Cruise

Big Ideas

•To classify pelagic communities and foodwebs within different environments and across seasons within the Scotia Sea

•To collect body condition indices and other parameters to examine life-cycle flexibility across the Scotia Sea

•To examine physical variability as a forcing factor in pelagic community variability

Core objectives of JR177

To carry out a core sampling strategy that:-(i) Allows comparison across the range of Scotia Sea environments(ii) Allows comparisons across seasons(iii) Linkage between different trophic levels (primary, secondary, higher)

1

To determine different scales of variability in physical and biological parameters(large scale - water masses, mesoscale - around stations, small scale – krill swarms)

2

To characterise the main drivers of variability(i) Physical characterisation of core transect – calibrated against satellite data(ii) Macro- and micro-nutrient characterisation (including iron)

3

Determine flux within the context of pelagic food web processes4

ERS altimeter tracks over Scotia Sea

SEAWifS

JR161 – track achieved

JR161 - Sea Surface Temperature

JR177

• 48 days for core science (46 when taking mob/demob into account)(this includes 3 days for DIMES)

• Core box time (+ calibration) is split out into an additional cruise= JR185

• JR185 will be done before Xmas, JR177 after Xmas

JR177 – external requests

• Iron work (NOC – AFI CGS) – 2 berths

• Evgeny Pakhomov (UBC) – 1– jellies and fish

• Dorothee Bakker (UEA) – 1 berth

• Ezio Rosato (Leicester – Full AFI) – 1 berth

Full AFI

AFI - CGS

Collaborations

JR177 Provisional PersonnelNutrients, phytoplankton , iron Korb, Whitehouse, Gordon, Bibby, Neilsdottir

Mesozooplantkon Ward, Hirst, Shreeve, Tarling

Macrozooplantkon/krill Fielding, Watkins, Atkinson, Pakhomov

Nekton Collins, Stowasser

Oceanography Venables, AN Other (a), Jones

Biochemistry Pond

Data management Cunningham

Moorings and sampling gear Enderlein

Higher predators/whales AN Other (b), AN Other (c’)

Total 24 personnel(to fit into 11 single cabins; 4 double cabins, 1-2 PSO cabin)

Krill AFI Gaten

Proposed JR177 track

12 stations occupied for ~2.5d each (extra time for 2 mooring stations)

7 stations at same positions as JR1615 stations to be positioned responsively

Time

01:00

02:00

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06:00

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Day 2 Day 3

LHPR RMT 25

Tow fish Depth stratified

MOCNESS  

   

   

FRRF  

CTD CTD

   

  Bongo

Go Flo  

FRRF RMT 25

  Depth Stratified

   

MOCNESS  

   

   

Minibongo RMT Target fishing

LHPR  

   

   

RMT 25 Target fishing RMT Target fishing

   

   

LHPR  

Provisional Station Activities

Acoustic and UOR survey

Day 1

RMT Target fishing

Time Day 1 Day 2 Day 3 Day 4

01:00 MOCNESS RMT 25 RMT 25 RMT 25 target fishing

02:00 0 – 1000 m Target fishing Depth stratified  

03:00   LHPR 1000 – 400 m Mooring

04:00 Tow Fish 0 – 1000m 400 – 0 m Deployment

05:00 FRRF darkness 120 m      

06:00   FRRF 120 m    

07:00 CTD – 10 m off sea bed CTD – 10 m off sea bed CTD – 10 m off sea bed  

08:00        

09:00 CTD 140 m CTD 140 m CTD 140 m  

10:00       RMT 25

11:00 Go Flo Go Flo Go Flo Depth stratified day

12:00        

13:00 FRRF – daylight 120 m FRRF – daylight 120 m FRRF – daylight 120 m  

14:00 CTD – HPLC 2000 m CTD – HPLC 2000 m CTD – HPLC 2000 m  

15:00       Acoustic Survey

16:00   CTD 140 m MOCNESS 0 – 1000m LHPR - daylight  

17:00 Bongo 3 * 400 m      

18:00 Mini bongo 1 * 400 m      

19:00 RMT 25 Bongo 3 * 400 m Bongo 3 * 400 m  

20:00 Target fishing      

21:00   RMT 25 RMT 25 RMT 25

22:00   Target fishing Target fishing Target fishing

23:00   RMT 25    

24:00   Depth stratified night    

4 Day Process Station Activities