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RRS James Clark Ross JR19981216 (JR38)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS James Clark Ross (74JC)
Cruise identifierJR19981216 (JR38)
Cruise period1998-12-16 — 1999-01-12
StatusCompleted
Port of departureStanley, Falkland Islands (Malvinas)
Port of returnStanley, Falkland Islands (Malvinas)
PurposeResearch
ObjectivesThe Pelagic Ecosystem Studies Core Programme is aimed at understanding the processes generating variability in the South Georgia marine ecosystem, with a particular emphasis on interannual variation. JR38 was the fourth cruise in the programme series.

On departure from Stanley, the ship steamed to the head of a standard oceanographic transect just to the north of the Maurice Ewing Bank (MEB). The transect consisted of 22 hydrographic stations, 35 km apart. On each station, a CTD profile with water bottle samples was taken to generate profiles of standard physical characters and allow chemical analyses and the determination of chlorophyl concentration. Jigging for squid was also undertaken simultaneously. Zooplankton net hauls were used to characterise the zooplankton community on each station and a chlorophyll fluorescence profile was also obtained using an Aquapack system. On a number of stations, extra water and zooplankton samples were obtained for detailed
biochemical analyses. Between the stations two acoustic systems were operational, a SIMRAD EK500 echoounder was run integrating returned echo signals to 250 metres, and a passive hydrophone array to monitor whales.

In the vicinity of South Georgia, surveys of two mesoscale (80x80km) boxes consisting of 5 sets of paired transects were sampled. A towed undulating oceanographic recorder (UOR) was used to characterise the upper 150m of the water column and the EK500 was used to describe the distribution of krill and other acoustic scatterers. Underway chemistry and standard analyses of the surface water were also undertaken. A series of standard station activities of CTD, water bottle samples, RMT8 and zooplankton net hauls were carried out at on-shelf and off-shelf stations within each survey area. Experimental work on zooplankton grazing, excretion and development rates was also undertaken.

Most of the data were validated and calibrated at sea and are available for comparative analyses with data from the previous three seasons. The preliminary figures indicate that there are some significant differences from earlier surveys in both the physical and biological regimes.
Chief scientistInigo Everson (British Antarctic Survey)
ProjectPelagic Ecosystem Studies
Coordinating bodyBAS
Cruise reportRRS James Clark Ross JR19981216 (JR38) cruise report jr38.pdf (0.17 MB) 
Ocean/sea areas 
GeneralSouth West Atlantic Ocean (limit 20W)
SpecificSouth Georgia, Maurice Ewing Bank transect
Data held at BODC Get data
Series/Profiles 
41  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.
22149571998-12-23 09:16:30 51° 21' 14" S  40° 42' 17" W  View metadata report for BODC series reference number 2214957
22149691998-12-23 15:03:30 51° 38' 13" S  40° 29' 9" W  View metadata report for BODC series reference number 2214969
22149821998-12-23 23:50 52° 12' 17" S  40° 2' 27" W  View metadata report for BODC series reference number 2214982
22150571998-12-25 10:48:30 53° 36' 39" S  38° 53' 31" W  View metadata report for BODC series reference number 2215057
22151491999-01-02 22:09 53° 49' 12" S  38° 52' 48" W  View metadata report for BODC series reference number 2215149
22148161998-12-21 07:47 48° 32' 38" S  42° 52' 1" W  View metadata report for BODC series reference number 2214816
22148411998-12-21 17:30:30 49° 6' 28" S  42° 26' 49" W  View metadata report for BODC series reference number 2214841
22152051999-01-05 22:29:30 53° 21' 35" S  38° 4' 47" W  View metadata report for BODC series reference number 2215205
22148651998-12-21 23:29 49° 23' 20" S  42° 13' 58" W  View metadata report for BODC series reference number 2214865
22150081998-12-24 10:12:30 52° 46' 1" S  39° 34' 44" W  View metadata report for BODC series reference number 2215008
22150701998-12-28 22:01:30 54° 15' 0" S  35° 43' 11" W  View metadata report for BODC series reference number 2215070
22151371998-12-31 20:04:30 54° 22' 11" S  34° 27' 36" W  View metadata report for BODC series reference number 2215137
22151861999-01-04 22:09 53° 45' 0" S  38° 16' 48" W  View metadata report for BODC series reference number 2215186
22148041998-12-21 02:24 48° 15' 18" S  43° 4' 47" W  View metadata report for BODC series reference number 2214804
22148281998-12-21 13:14 48° 49' 37" S  42° 39' 18" W  View metadata report for BODC series reference number 2214828
22148771998-12-22 03:45:30 49° 39' 57" S  42° 1' 22" W  View metadata report for BODC series reference number 2214877
22148901998-12-22 12:36 50° 13' 51" S  41° 35' 38" W  View metadata report for BODC series reference number 2214890
22149701998-12-23 19:43:30 51° 55' 19" S  40° 15' 54" W  View metadata report for BODC series reference number 2214970
22150211998-12-24 14:57 53° 2' 52" S  39° 21' 32" W  View metadata report for BODC series reference number 2215021
22150451998-12-25 05:47:30 53° 20' 13" S  39° 7' 44" W  View metadata report for BODC series reference number 2215045
22151011998-12-30 05:25 54° 23' 24" S  35° 33' 36" W  View metadata report for BODC series reference number 2215101
22151741999-01-04 05:23:30 53° 47' 23" S  38° 35' 24" W  View metadata report for BODC series reference number 2215174
22148531998-12-21 19:02 49° 6' 54" S  42° 26' 6" W  View metadata report for BODC series reference number 2214853
22148891998-12-22 08:27:30 49° 56' 49" S  41° 48' 50" W  View metadata report for BODC series reference number 2214889
22149081998-12-22 16:39:30 50° 30' 32" S  41° 22' 33" W  View metadata report for BODC series reference number 2214908
22149211998-12-22 21:36:30 50° 47' 31" S  41° 9' 10" W  View metadata report for BODC series reference number 2214921
22149451998-12-23 03:56 51° 4' 19" S  40° 55' 47" W  View metadata report for BODC series reference number 2214945
22150821998-12-29 04:46:30 54° 2' 23" S  35° 12' 36" W  View metadata report for BODC series reference number 2215082
22150941998-12-29 22:42:30 54° 11' 23" S  35° 2' 59" W  View metadata report for BODC series reference number 2215094
22151131998-12-30 22:05 54° 32' 23" S  35° 23' 24" W  View metadata report for BODC series reference number 2215113
22151621999-01-03 22:38 53° 25' 47" S  38° 42' 0" W  View metadata report for BODC series reference number 2215162
22150691998-12-25 18:13:30 53° 53' 13" S  38° 39' 28" W  View metadata report for BODC series reference number 2215069
22151501999-01-03 05:33:30 53° 27' 36" S  39° 0' 0" W  View metadata report for BODC series reference number 2215150
22151981999-01-05 05:04:30 53° 23' 59" S  38° 23' 59" W  View metadata report for BODC series reference number 2215198
22152171999-01-06 05:43:30 53° 45' 0" S  37° 56' 23" W  View metadata report for BODC series reference number 2215217
22147971998-12-20 20:46:30 47° 58' 37" S  43° 16' 26" W  View metadata report for BODC series reference number 2214797
22149331998-12-22 23:10 50° 47' 16" S  41° 8' 38" W  View metadata report for BODC series reference number 2214933
22149941998-12-24 05:28 52° 28' 58" S  39° 48' 32" W  View metadata report for BODC series reference number 2214994
22150331998-12-24 16:01:30 53° 2' 52" S  39° 21' 35" W  View metadata report for BODC series reference number 2215033
22151251998-12-31 04:44:30 54° 20' 24" S  34° 52' 48" W  View metadata report for BODC series reference number 2215125
22152291999-01-06 14:16:30 53° 8' 59" S  37° 49' 47" W  View metadata report for BODC series reference number 2215229
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.
22114741998-12-27 07:54  — 1999-01-06 20:11 54° 47' 15" S  39° 9' 24" W — 53° 7' 18" S  34° 25' 4" W  View metadata report for BODC series reference number 2211474
Discrete samples 
42  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
38  Sample taken from ship's non-toxic supplyNitrite 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