RRS James Clark Ross JR20120120 (JR255A)

Cruise summary report

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Cruise Info.

Ship name (ship code)

RRS James Clark Ross (74JC)

Cruise identifier

JR20120120 (JR255A)

Cruise period

2012-01-20 — 2012-02-03

Status

Completed

Port of departure

Stanley, Falkland Islands (Malvinas)

Port of return

Mare Harbour, Falkland Islands (Malvinas)

Purpose

Research

Objectives

The objectives of the GENTOO project are:
(i) to quantify and understand the possible new source of dense water overflow and its variability; to determine the outflow's potential as an early indicator of Antarctic climate change; to assess the impact of changing dense overflows on the locations and strengths of the surface currents and frontal jets; to provide valuable constraints for climate models that describe how changes in ocean circulation feedback on and regulate climate change in polar latitudes.
(ii) to determine the krill biomass distribution and (temporal and spatial) variability to the east of the Antarctic Peninsula and its likely impact on the circumpolar krill ecosystem; to assess the impact of any variations in the location of the frontal jets (from objective i) on the krill biomass distribution; to alleviate a severe regional lack of field data on krill, a key species in the Antarctic food web.
To achieve the two objectives, our technological deliverable is a critical evaluation of our ability to measure (i) current velocity from a glider and (ii) krill biomass from a glider.
The GENTOO fieldwork in the Weddell Sea was accomplished through a SeaGlider campaign in early 2012. A glider deployment cruise (JR255A) was the primary data gathering exercise; as well as deploying three SeaGliders, a hydrographic survey was undertaken together with nets and underway biological, chemical and physical measurements. The recovery of the three gliders was to have taken place on the recovery cruise.

Chief scientist

Karen J Heywood (University of East Anglia School of Environmental Sciences)

Project

Gliders: Excellent New Tools for Observing the Ocean (GENTOO)

Coordinating body

Natural Environment Research Council (NERC)

Cruise report

(2.71 MB)

Ocean/sea areas

General

Southern Ocean

Specific

Drake Passage, Weddell Sea, Powell Basin

Track charts

(0.03 MB)

Measurements

Physical oceanography

Surface measurements underway (T,S)

Quantity: activity duration in days = 12
Description: Underway Temperature and Salinity of surface water

Bathythermograph

Quantity: activity duration in days = 12
Description: Underway Temperature and Salinity of surface water

CTD stations

Quantity: number of stations = 41
Description: Vertical profiles of Salinity, Temperature, Dissolved Oxygen, Chlorophyll

Current profiler (eg ADCP)

Quantity: activity duration in days = 12
Description: ADCP current velocities

Chemical oceanography

Isotopes

Quantity: number of stations = 9
Description: Nitrous oxide isotopes

Biology and fisheries

Primary productivity

Quantity: number of stations = 37
Description: Chlorophyll and phytoplankton data

Crustaceans

Quantity: number of hauls = 5
Description: Krill sample catch

Acoustic reflection on marine organisms.

Quantity: activity duration in days = 12
Description: EK60 backscatter data

Moorings, landers, buoys

Physical oceanography

Subsurface temperature and salinity measurements

63° 22' 17" S 52° 58' 35" W — Seaglider 522 deployment, measuring Chlorophyll fluroescence, Oxygen, Temperature, Salinity

Subsurface temperature and salinity measurements

63° 22' 35" S 52° 58' 30" W — Seaglider 539 depoyment measuring dissolved oxygen, Temperature, Salinity, chlorophyll fluorescence

Subsurface temperature and salinity measurements

61° 36' 29" S 48° 25' 35" W — Seaglider 546, measuring Temperature, Salinity

Neutrally buoyant floats

63° 1' 29" S 51° 30' 0" W — Argo float measuring Temperature and Salinity

Neutrally buoyant floats

63° 31' 17" S 51° 7' 11" W — Argo float measuring Temperature and Salinity

Neutrally buoyant floats

63° 31' 17" S 51° 7' 11" W — Argo float measuring Temperature and Salinity

Data held at BODC

Get data

Series/Profiles

25 Bottle station

Reference numbers
Particulate total and organic nitrogen concentrations in the water column
Vertical spatial coordinates
Quality control flags
Particulate total and organic carbon concentrations in the water column

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BODC id	Date/Time	Location
2081052	2012-01-24 06:21	63° 31' 33" S 51° 56' 14" W
2081076	2012-01-24 11:06	63° 32' 22" S 51° 33' 28" W
2081181	2012-01-27 12:26	62° 55' 56" S 51° 21' 48" W
2081015	2012-01-23 19:52	63° 22' 19" S 52° 58' 47" W
2081088	2012-01-24 14:22	63° 31' 20" S 51° 7' 1" W
2081144	2012-01-26 22:13	62° 57' 57" S 51° 51' 2" W
2081156	2012-01-27 04:39	62° 47' 46" S 51° 11' 47" W
2081236	2012-01-28 11:50	63° 12' 1" S 51° 42' 12" W
2081040	2012-01-24 04:01	63° 29' 24" S 52° 7' 11" W
2081168	2012-01-27 08:26	62° 55' 27" S 51° 21' 25" W
2081193	2012-01-27 17:50	62° 57' 8" S 51° 23' 19" W
2081212	2012-01-28 03:00	63° 4' 50" S 51° 33' 13" W
2081132	2012-01-25 15:32	63° 9' 30" S 54° 24' 31" W
2081027	2012-01-23 22:27	63° 25' 12" S 52° 33' 32" W
2081064	2012-01-24 08:25	63° 33' 54" S 51° 42' 35" W
2081224	2012-01-28 07:37	63° 9' 41" S 51° 39' 3" W
2081107	2012-01-25 04:38	63° 20' 22" S 53° 0' 39" W
2081039	2012-01-24 00:30	63° 28' 10" S 52° 18' 28" W
2081119	2012-01-25 09:02	63° 10' 38" S 53° 41' 57" W
2081120	2012-01-25 10:51	63° 9' 35" S 54° 4' 14" W
2081200	2012-01-27 20:40	62° 58' 26" S 51° 24' 53" W
2081248	2012-01-28 17:14	63° 0' 2" S 52° 54' 43" W
2081261	2012-01-29 00:02	62° 9' 49" S 53° 58' 3" W
2081285	2012-01-29 11:39	61° 27' 26" S 54° 3' 2" W
2081273	2012-01-29 06:10	61° 48' 33" S 54° 0' 32" W

41 CTD/STD cast

Reference numbers
Transmittance and attenuance of the water column
Salinity of the water column
Temperature of the water column
Vertical spatial coordinates
Dissolved oxygen parameters in the water column
Density of the water column
Electrical conductivity of the water column
Chlorophyll pigment concentrations in water bodies

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BODC id	Date/Time	Location
1893875	2012-01-24 11:58:03	63° 32' 22" S 51° 33' 28" W
1893992	2012-01-27 05:44:45	62° 47' 46" S 51° 11' 47" W
1894067	2012-01-28 03:37:22	63° 4' 50" S 51° 33' 13" W
1894080	2012-01-28 08:17:43	63° 9' 41" S 51° 39' 3" W
1894203	2012-01-29 09:02:42	61° 37' 55" S 54° 1' 55" W
1894215	2012-01-29 10:25:57	61° 32' 37" S 54° 2' 34" W
1893814	2012-01-23 22:43:29	63° 25' 12" S 52° 33' 32" W
1893863	2012-01-24 09:00:26	63° 33' 54" S 51° 42' 35" W
1893899	2012-01-25 00:27:15	63° 22' 13" S 52° 48' 11" W
1893943	2012-01-25 11:01:25	63° 9' 35" S 54° 4' 14" W
1893955	2012-01-25 13:53:38	63° 9' 32" S 54° 54' 15" W
1894135	2012-01-28 17:26:48	63° 0' 2" S 52° 54' 43" W
1894147	2012-01-29 00:24:13	62° 9' 49" S 53° 58' 3" W
1894172	2012-01-29 05:07:51	61° 53' 52" S 53° 59' 54" W
1893918	2012-01-25 06:54:05	63° 16' 11" S 53° 19' 41" W
1893838	2012-01-24 04:23:41	63° 29' 24" S 52° 7' 11" W
1893979	2012-01-25 23:35:33	63° 8' 48" S 51° 44' 51" W
1894079	2012-01-28 06:10:22	63° 7' 1" S 51° 35' 29" W
1894160	2012-01-29 03:45:12	61° 59' 10" S 53° 59' 13" W
1894196	2012-01-29 07:45:32	61° 43' 13" S 54° 1' 9" W
1894240	2012-01-31 00:22:44	61° 36' 30" S 48° 25' 48" W
1893980	2012-01-26 23:04:14	62° 57' 57" S 51° 51' 2" W
1894055	2012-01-28 00:56:25	63° 3' 6" S 51° 30' 45" W
1894111	2012-01-28 12:12:44	63° 12' 1" S 51° 42' 12" W
1894123	2012-01-28 15:34:08	62° 59' 52" S 52° 29' 18" W
1893826	2012-01-24 00:47:23	63° 28' 10" S 52° 18' 28" W
1894092	2012-01-28 10:34:23	63° 10' 58" S 51° 40' 44" W
1893851	2012-01-24 06:47:03	63° 31' 33" S 51° 56' 14" W
1893931	2012-01-25 09:15:15	63° 10' 38" S 53° 41' 57" W
1893967	2012-01-25 15:44:58	63° 9' 30" S 54° 24' 31" W
1894018	2012-01-27 13:29:24	62° 55' 56" S 51° 21' 48" W
1894159	2012-01-29 02:11:25	62° 4' 32" S 53° 58' 47" W
1894239	2012-01-30 08:30:03	63° 9' 24" S 51° 45' 30" W
1893802	2012-01-23 20:09:29	63° 22' 19" S 52° 58' 47" W
1893887	2012-01-24 15:11:59	63° 31' 20" S 51° 7' 1" W
1893906	2012-01-25 04:56:16	63° 20' 22" S 53° 0' 39" W
1894006	2012-01-27 09:28:54	62° 55' 27" S 51° 21' 25" W
1894031	2012-01-27 18:38:16	62° 57' 8" S 51° 23' 19" W
1894043	2012-01-27 21:24:45	62° 58' 26" S 51° 24' 53" W
1894184	2012-01-29 06:23:05	61° 48' 33" S 54° 0' 32" W
1894227	2012-01-29 12:02:17	61° 27' 26" S 54° 3' 2" W

1 GPS positioning system

Reference numbers
Horizontal spatial co-ordinates
Date and time
Platform or instrument orientation
Horizontal platform movement

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Reference numbers
Horizontal spatial co-ordinates
Date and time
Platform or instrument orientation
Horizontal platform movement

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BODC id	Date/Time	Location	Doc.
1902106	2012-01-20 00:00 — 2012-02-03 13:14	51° 41' 29" S 57° 49' 25" W — 51° 54' 5" S 58° 26' 14" W

1 Meteorological data logger

Visible waveband radiance and irradiance measurements in the atmosphere
Reference numbers
Horizontal spatial co-ordinates
Air pressure
Date and time
Air temperature
Wind strength and direction
Solar Radiation
Atmospheric humidity

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BODC id	Date/Time	Location	Doc.
1902118	2012-01-20 00:00 — 2012-02-03 13:14	51° 41' 29" S 57° 49' 25" W — 51° 54' 5" S 58° 26' 14" W

1 Multiple instrument types

Sound velocity and travel time in the water column
Reference numbers
Horizontal spatial co-ordinates
Date and time
Salinity of the water column
Temperature of the water column
Metadata parameters
Electrical conductivity of the water column
Chlorophyll pigment concentrations in water bodies

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[Hide series]

BODC id	Date/Time	Location	Doc.
1902131	2012-01-20 00:00 — 2012-02-03 13:14	51° 41' 29" S 57° 49' 25" W — 51° 54' 5" S 58° 26' 14" W

1 Pumped water sample

Horizontal spatial co-ordinates
Date and time
Particulate total and organic nitrogen concentrations in the water column
Particulate total and organic carbon concentrations in the water column

[Show series]

Horizontal spatial co-ordinates
Date and time
Particulate total and organic nitrogen concentrations in the water column
Particulate total and organic carbon concentrations in the water column

[Hide series]

BODC id	Date/Time	Location	Doc.
2081297	2012-01-21 16:59 — 2012-01-23 17:28	63° 22' 30" S 55° 55' 11" W — 55° 51' 1" S 52° 7' 6" W

Discrete samples

41 CTD frame plus rosette sampler

Particulate total and organic nitrogen concentrations in the water column
Temperature of the water column
Concentration of silicon species in the water column
Particulate total and organic carbon concentrations in the water column
Chlorophyll pigment concentrations in water bodies

9 Sample taken from ship's non-toxic supply

Particulate total and organic nitrogen concentrations in the water column
Concentration of silicon species in the water column
Particulate total and organic carbon concentrations in the water column

Resources

RRS James Clark Ross JR20120120 (JR255A)

Cruise summary report

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