Resources

RRS James Clark Ross JR20030105 (JR82)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS James Clark Ross (74JC)
Cruise identifierJR20030105 (JR82)
Cruise period2003-01-05 — 2003-02-24
StatusCompleted
Port of departureStanley, Falkland Islands (Malvinas)
Port of returnStanley, Falkland Islands (Malvinas)
PurposeResearch
ObjectivesFrontal Cruise CP8 - Bio Synoptic
JR82 forms part of DYNAMOE (BAS's programme focusing on Antarctic krill within the South Georgia-Scotia Sea ecosystem), to help understand the large scale distribution of Antarctic krill and transport of material within the Scotia Sea. It also forms part ot the UK GLOBEC programme as a component to SO-GLOBEC, to understand the physical-biological factors dictating the distribution, survival, and population size of krill.

This cruise aimed to investigate large-scale transport, growth and survival of krill across the Scotia Sea. The cruise was planned around several principles. Firstly, sea ice is hard to sample properly at large scales, so the cruise was planned for summer when it had retreated furthest. Secondly, the study links well with other studied areas, the Antarctic Peninsula and South Georgia. Thirdly, in the Scotia Sea, the currents do not flow parallel to the winter ice zone but loop far to the north and there is uncertainty over the relative roles of oceanfronts and zones of retreated ice in the generation and transport of krill blooms and aggregations.

Aims:
1. What controls the growth, development and survival of krill in the Scotia Sea?
2. How important are theses processes in determining the distibution and abundance of krill?
3. To sample the Western Core Box as part of an ongoing monitoring programme.
4. To lift and check two moorings as part of an AFI grant.

Results:
1. 8 long transects across Scotia Sea from north of the SACCF to 63° S and east to the South Sandwich Islands, total of 4300 miles.
2. 56 "rapid stations" comprising a period of acoustic searching and target fishing for krill with the RMT. 0-200m CTD drops with water samples analysed at fixed depths. Shallow CTD for particulate filtration and primary production deck incubations. Bongo nets to 400m for mesozooplankton abundance and copepods for condition factor analysis and egg production rate. Sonobuoys for cetacean acoustis deployed in the vicinity of the stations. At 11 stations a pair of Argo drifters drogued at 20 and 100m deployed to measure current velocity in the Eastern Scotia Sea. Series of 6 LHPR hauls to 100m.
3. A series of 24-hour process stations with a high abundance of krill larvae for diel vertical migration cycles was prevented due to a rarity of krill where expected.
Chief scientistAngus Atkinson (British Antarctic Survey)
ProjectDYNAMOE
Coordinating bodyBritish Antarctic Survey (BAS)
Cruise reportRRS James Clark Ross JR20030105 (JR82) cruise report jr82.pdf (3.47 MB) 
Ocean/sea areas 
GeneralSouth Atlantic Ocean
SpecificScotia Sea, Peninsula to South Georgia
Track chartsRRS James Clark Ross JR20030105 (JR82) cruise track — jr82trk.pdf (0.24 MB) 
Measurements 
Physical oceanography 
Surface measurements underway (T,S)Quantity: track kilometres = 6919
Description: 8 transects
BathythermographQuantity: track kilometres = 6919
Description: 8 transects
Water bottle stationsQuantity: number of stations = 56
Description: 0-200m with water samples analysed at fixed depths
CTD stationsQuantity: number of stations = 56
Description: 0-200m with water samples analysed at fixed depths
CTD stationsDescription: shallow CTDs
Subsurface temperature and salinity measurementsQuantity: track kilometres = 6919
Description: 8 transects
Surface drifters/drifting buoysQuantity: number of stations = 11
Description: pair of Argo drifters deployed at each station
Biology and fisheries 
Primary productivityDescription: shallow CTDs
Particulate organic matter (inc POC, PON)Description: shallow CTDs
ZooplanktonQuantity: number of stations = 56
Description: Bongo nets to 400m for mesozooplankton and eggs
ZooplanktonQuantity: number of hauls = 6
Description: LHPR to 100m
Eggs and larvaeQuantity: number of stations = 56
Description: Bongo nets to 400m for mesozooplankton and eggs
Mammals and reptilesQuantity: track kilometres = 6919
Description: 8 transects
Acoustic reflection on marine organisms.Quantity: number of stations = 56
Description: Sonobuoys for cetacean acoustics
Acoustic reflection on marine organisms.Quantity: number of stations = 56
Description: acoustic searching for krill
Exploratory fishingQuantity: number of stations = 56
Description: target fishing for krill with a RMT
Data held at BODC Get data
Series/Profiles 
61  Bottle station
Reference numbers
Nitrite concentration parameters in the water column
Vertical spatial coordinates
Phosphate concentration parameters in the water column
Silicate concentration parameters in the water column
Ammonium and ammonia concentration parameters in water bodies
Nitrate concentration parameters in the water column
Quality control flags
Reference numbers
Nitrite concentration parameters in the water column
Vertical spatial coordinates
Phosphate concentration parameters in the water column
Silicate concentration parameters in the water column
Ammonium and ammonia concentration parameters in water bodies
Nitrate concentration parameters in the water column
Quality control flags

BODC idDate/TimeLocationDoc.
22174212003-01-10 13:25 60° 26' 23" S  54° 57' 28" W  View metadata report for BODC series reference number 2217421
22174702003-01-12 23:41:30 60° 31' 44" S  52° 12' 39" W  View metadata report for BODC series reference number 2217470
22175252003-01-15 15:36 57° 36' 3" S  49° 35' 2" W  View metadata report for BODC series reference number 2217525
22176172003-01-20 04:23 59° 5' 9" S  46° 39' 14" W  View metadata report for BODC series reference number 2217617
22177222003-01-27 05:23 59° 44' 16" S  41° 50' 38" W  View metadata report for BODC series reference number 2217722
22177832003-01-30 02:50 54° 45' 46" S  41° 4' 33" W  View metadata report for BODC series reference number 2217783
22178632003-02-03 00:18 58° 58' 15" S  34° 39' 43" W  View metadata report for BODC series reference number 2217863
22179312003-02-06 21:50:30 58° 47' 34" S  27° 34' 26" W  View metadata report for BODC series reference number 2217931
22179552003-02-07 23:39 57° 27' 21" S  30° 22' 26" W  View metadata report for BODC series reference number 2217955
22179802003-02-09 12:05:30 55° 27' 0" S  34° 23' 31" W  View metadata report for BODC series reference number 2217980
22180312003-02-15 05:13:30 53° 47' 5" S  38° 35' 2" W  View metadata report for BODC series reference number 2218031
22174572003-01-12 02:01 62° 26' 2" S  53° 20' 56" W  View metadata report for BODC series reference number 2217457
22176782003-01-23 06:15:30 59° 3' 14" S  44° 25' 8" W  View metadata report for BODC series reference number 2217678
22177102003-01-26 18:28 60° 43' 55" S  41° 59' 24" W  View metadata report for BODC series reference number 2217710
22177582003-01-28 23:02:30 56° 45' 14" S  41° 22' 30" W  View metadata report for BODC series reference number 2217758
22179182003-02-06 11:16:30 59° 28' 1" S  26° 7' 33" W  View metadata report for BODC series reference number 2217918
22174082003-01-10 03:15:30 59° 27' 0" S  55° 18' 7" W  View metadata report for BODC series reference number 2217408
22174452003-01-11 16:52:30 62° 24' 50" S  54° 21' 7" W  View metadata report for BODC series reference number 2217445
22174692003-01-12 12:10 61° 30' 7" S  52° 46' 26" W  View metadata report for BODC series reference number 2217469
22174822003-01-13 12:33 59° 34' 37" S  51° 35' 27" W  View metadata report for BODC series reference number 2217482
22174942003-01-14 02:15:30 58° 36' 39" S  51° 5' 34" W  View metadata report for BODC series reference number 2217494
22175622003-01-17 16:24:30 61° 30' 18" S  48° 13' 47" W  View metadata report for BODC series reference number 2217562
22175742003-01-17 23:04:30 61° 43' 22" S  48° 9' 21" W  View metadata report for BODC series reference number 2217574
22176912003-01-23 20:28 60° 1' 33" S  43° 58' 26" W  View metadata report for BODC series reference number 2217691
22177712003-01-29 11:43:30 55° 45' 28" S  41° 13' 26" W  View metadata report for BODC series reference number 2217771
22178512003-02-02 12:51 58° 9' 18" S  35° 46' 58" W  View metadata report for BODC series reference number 2217851
22179672003-02-08 12:43 56° 47' 2" S  31° 45' 10" W  View metadata report for BODC series reference number 2217967
22175492003-01-16 16:05:30 59° 34' 1" S  48° 56' 13" W  View metadata report for BODC series reference number 2217549
22175862003-01-18 13:21:30 61° 34' 44" S  46° 4' 19" W  View metadata report for BODC series reference number 2217586
22176302003-01-21 04:06 57° 7' 11" S  45° 59' 38" W  View metadata report for BODC series reference number 2217630
22177092003-01-26 06:06 60° 55' 15" S  43° 30' 28" W  View metadata report for BODC series reference number 2217709
22178262003-02-01 09:48 56° 32' 9" S  37° 55' 51" W  View metadata report for BODC series reference number 2217826
22178872003-02-04 00:06:30 60° 35' 45" S  32° 22' 19" W  View metadata report for BODC series reference number 2217887
22175502003-01-17 03:25:30 60° 32' 9" S  48° 39' 57" W  View metadata report for BODC series reference number 2217550
22175982003-01-18 22:04:30 61° 14' 38" S  45° 40' 8" W  View metadata report for BODC series reference number 2217598
22176662003-01-22 18:30 58° 5' 6" S  44° 49' 44" W  View metadata report for BODC series reference number 2217666
22179062003-02-05 11:15:30 62° 39' 53" S  29° 15' 0" W  View metadata report for BODC series reference number 2217906
22175372003-01-16 05:14 58° 34' 55" S  49° 17' 31" W  View metadata report for BODC series reference number 2217537
22177462003-01-28 08:45:30 57° 44' 52" S  41° 31' 29" W  View metadata report for BODC series reference number 2217746
22178752003-02-03 12:41:30 59° 47' 5" S  33° 32' 16" W  View metadata report for BODC series reference number 2217875
22180432003-02-15 21:08:30 53° 42' 50" S  37° 58' 1" W  View metadata report for BODC series reference number 2218043
22176052003-01-19 16:21:30 60° 4' 4" S  46° 59' 41" W  View metadata report for BODC series reference number 2217605
22176292003-01-20 15:48:30 58° 6' 10" S  46° 19' 12" W  View metadata report for BODC series reference number 2217629
22176422003-01-21 14:45:30 56° 7' 19" S  45° 43' 47" W  View metadata report for BODC series reference number 2217642
22176542003-01-22 06:22 57° 5' 45" S  45° 17' 13" W  View metadata report for BODC series reference number 2217654
22178022003-01-31 09:08 54° 54' 35" S  39° 59' 5" W  View metadata report for BODC series reference number 2217802
22178142003-01-31 20:09 55° 43' 26" S  38° 58' 11" W  View metadata report for BODC series reference number 2217814
22178382003-02-02 00:12 57° 21' 0" S  36° 52' 4" W  View metadata report for BODC series reference number 2217838
22179922003-02-13 20:23 53° 50' 45" S  39° 8' 34" W  View metadata report for BODC series reference number 2217992
22180182003-02-14 20:30 53° 25' 55" S  38° 41' 45" W  View metadata report for BODC series reference number 2218018
22173902003-01-09 13:52 58° 29' 52" S  55° 35' 49" W  View metadata report for BODC series reference number 2217390
22174332003-01-11 06:08:30 61° 25' 55" S  54° 39' 28" W  View metadata report for BODC series reference number 2217433
22175012003-01-14 15:34 57° 36' 28" S  50° 29' 56" W  View metadata report for BODC series reference number 2217501
22175132003-01-15 02:41 56° 33' 46" S  50° 2' 20" W  View metadata report for BODC series reference number 2217513
22177342003-01-27 19:21 58° 44' 31" S  41° 41' 9" W  View metadata report for BODC series reference number 2217734
22177952003-01-30 20:43:30 54° 5' 56" S  40° 59' 2" W  View metadata report for BODC series reference number 2217795
22178992003-02-04 13:48 61° 24' 39" S  31° 9' 18" W  View metadata report for BODC series reference number 2217899
22179432003-02-07 10:24:30 58° 7' 30" S  28° 59' 16" W  View metadata report for BODC series reference number 2217943
22179792003-02-09 01:29 56° 7' 4" S  33° 4' 22" W  View metadata report for BODC series reference number 2217979
22180062003-02-14 04:50 53° 29' 49" S  39° 15' 46" W  View metadata report for BODC series reference number 2218006
22180552003-02-16 05:20 53° 28' 4" S  38° 2' 56" W  View metadata report for BODC series reference number 2218055
1  Multiple instrument types
Reference numbers
Horizontal spatial co-ordinates
Date and time
Nitrite concentration parameters in the water column
Phosphate concentration parameters in the water column
Silicate concentration parameters in the water column
Ammonium and ammonia concentration parameters in water bodies
Nitrate concentration parameters in the water column
Reference numbers
Horizontal spatial co-ordinates
Date and time
Nitrite concentration parameters in the water column
Phosphate concentration parameters in the water column
Silicate concentration parameters in the water column
Ammonium and ammonia concentration parameters in water bodies
Nitrate concentration parameters in the water column

BODC idDate/TimeLocationDoc.
22115052003-01-09 17:40  — 2003-02-16 14:07 62° 45' 40" S  55° 41' 32" W — 53° 15' 25" S  26° 5' 2" W  View metadata report for BODC series reference number 2211505
Discrete samples 
61  CTD frame plus rosette samplerNitrite concentration parameters in the water column
Phosphate concentration parameters in the water column
Silicate concentration parameters in the water column
Ammonium and ammonia concentration parameters in water bodies
Nitrate concentration parameters in the water column
1  Instrument mooring