Cruise inventory

RRS James Clark Ross JR20141231 (JR307, JR308)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS James Clark Ross (74JC)
Cruise identifierJR20141231 (JR307, JR308)
Cruise period2014-12-31 — 2015-01-07
StatusCompleted
Port of departureRothera, Antarctica
Port of returnRothera, Antarctica
PurposeResearch
ObjectivesJR307: Tracing deep waters and nutrient dynamics across the WAP shelf

Cruise JR307 was a key part of the three year field component of NERC Fellowship NE/K010034/1: Isotopic characterisation of nutrient dynamics and deep water behaviour in the west Antarctic Peninsula sea ice environment. Within this broad project, the specific objective of this cruise was to trace the circumpolar deep water (CDW) nutrient source from the shelf break to the coast, and examine its modification across the shelf and delivery to productive shelf ecosystems. We also aimed to examine spatial variability in nutrient supply, uptake and primary production along a transect across the shelf to the coast, thus providing a spatial context to ongoing time-series work at Rothera to examine the biogeochemical response to physical climate change at the Antarctic Peninsula. Cruise JR307 also provided a collaborative opportunity to examine the CDW supply of CO2 and spatial variability in DMS production by phytoplankton.
We conducted full-depth water column sampling at eleven stations along a transect from the shelf break to the long-term monitoring station of the Rothera Time Series (RaTS) in Ryder Bay. Stations were chosen to follow the deepest bathymetry (500 - 1000m depth) thought to act as a conduit for CDW across the WAP shelf. At each station full-depth physical oceanographic parameters were measured using the ship's CTD system and water samples were taken throughout the water column using the ship's 24 bottle Niskin rosette. Samples were taken for analysis of macronutrient concentrations, stable isotope composition of nitrate, concentration and isotope composition of particulate organic carbon and nitrogen, and RNA sequencing of organic matter. Samples were also taken for dissolved inorganic carbon system parameters, oxygen isotope composition of seawater, dimethyl sulphide (DMS) concentrations and associated parameters. Samples were filtered or fixed with preservative, for subsequent analysis at Rothera or on return to the UK or The Netherlands.

JR308: Benthic Biology of the Cold Hole

The aim of this cruise was driven by the objectives of EvolHist, a core project at BAS studying biodiversity, biogeography,
phylogeography and evolution in marine Antarctic fauna. Working in partnership with Polar Oceans, we had a four day scientific
cruise on RRS James Clark Ross to investigate the benthic biodiversity and oceanography of a basin with temperatures 1.1 oC colder than the surrounding regions at the same depths recently discovered by the Polar Oceans glider team (Venables, Anker, Meredith) at ~67o45 S, 69o01W. The cruise investigated the effect of temperature on the faunal composition of Antarctic shelf
benthos at a local scale, something that is only possible at this location due to this oceanographic anomaly.
The main objective of the biological component of this cruise was to collect marine invertebrates from transects inside the cold basin, in the shallower region surrounding the basin and in other (warmer) neighbouring areas at the same depth as the basin for comparison.
Using CTDs, video transects, and benthic trawls to collect animals for identification and population genetic analyses. We sampled two transects in each location at depths of between 200 m and 500 m including replicate Aggasiz trawls (AGT), epibenthic sledge (EBS) with video (shallow underwater video)(BAS's SUCS) and CTDs. On board, the AGT samples were sorted to phylum and class level before fixation while the EBS samples were initially fixed and will then be sorted on return to BAS Cambridge. Before the trawling took place, a swath survey was carried out to select seafloor areas suitable for benthic trawling.
Chief scientistPeter Enderlein (British Antarctic Survey), Sian Frances Henley (University of Edinburgh School of GeoSciences)
Coordinating bodyBritish Antarctic Survey (BAS)
Cruise reportRRS James Clark Ross JR20141231 (JR307, JR308) cruise report jr307_308.pdf — access key 'C' (2.44 MB) 
Ocean/sea areas 
GeneralSouthern Ocean
Track chartsRRS James Clark Ross JR20141231 (JR307, JR308) cruise track — jr307trk.pdf (00 MB)  RRS James Clark Ross JR20141231 (JR307, JR308) cruise track — jr308trk.pdf (00 MB) 
Measurements 
Physical oceanography 
Water bottle stationsQuantity: number of stations = 11
Description: Discreet seawater samples collected for analysis of biogeochemical and biological parameters using the JCR's stainless steel 24-bottle Niskin rosette. A vertical profile was sampled at each of the 11 stations. Seawater samples were taken for later analysis of macronutrient concentrations, isotopic composition of nitrate, concentration and isotopic composition of POC and PN, RNA sequencing, dissolved inorganic carbon system parameters, oxygen isotope composition of seawater, DMS and DMSP concentrations, and HPLC pigment analysis.
CTD stationsQuantity: number of stations = 11
Description: Conductivity, temperature, fluorescence and dissolved oxygen from the JCR's CTD
CTD stationsQuantity: number of stations = 11
Description: Conductivity, temperature, fluorescence and dissolved oxygen from the JCR's CTD package, measured on 11 vertical profiles.
Chemical oceanography 
Other dissolved gasesQuantity: number of stations = 11
Description: Discreet seawater samples collected for analysis of biogeochemical and biological parameters using the JCR's stainless steel 24-bottle Niskin rosette. A vertical profile was sampled at each of the 11 stations. Seawater samples were taken for later analysis of macronutrient concentrations, isotopic composition of nitrate, concentration and isotopic composition of POC and PN, RNA sequencing, dissolved inorganic carbon system parameters, oxygen isotope composition of seawater, DMS and DMSP concentrations, and HPLC pigment analysis.
PhosphateQuantity: number of stations = 11
Description: Discreet seawater samples collected for analysis of biogeochemical and biological parameters using the JCR's stainless steel 24-bottle Niskin rosette. A vertical profile was sampled at each of the 11 stations. Seawater samples were taken for later analysis of macronutrient concentrations, isotopic composition of nitrate, concentration and isotopic composition of POC and PN, RNA sequencing, dissolved inorganic carbon system parameters, oxygen isotope composition of seawater, DMS and DMSP concentrations, and HPLC pigment analysis.
NitrateQuantity: number of stations = 11
Description: Discreet seawater samples collected for analysis of biogeochemical and biological parameters using the JCR's stainless steel 24-bottle Niskin rosette. A vertical profile was sampled at each of the 11 stations. Seawater samples were taken for later analysis of macronutrient concentrations, isotopic composition of nitrate, concentration and isotopic composition of POC and PN, RNA sequencing, dissolved inorganic carbon system parameters, oxygen isotope composition of seawater, DMS and DMSP concentrations, and HPLC pigment analysis.
NitriteQuantity: number of stations = 11
Description: Discreet seawater samples collected for analysis of biogeochemical and biological parameters using the JCR's stainless steel 24-bottle Niskin rosette. A vertical profile was sampled at each of the 11 stations. Seawater samples were taken for later analysis of macronutrient concentrations, isotopic composition of nitrate, concentration and isotopic composition of POC and PN, RNA sequencing, dissolved inorganic carbon system parameters, oxygen isotope composition of seawater, DMS and DMSP concentrations, and HPLC pigment analysis.
SilicateQuantity: number of stations = 11
Description: Discreet seawater samples collected for analysis of biogeochemical and biological parameters using the JCR's stainless steel 24-bottle Niskin rosette. A vertical profile was sampled at each of the 11 stations. Seawater samples were taken for later analysis of macronutrient concentrations, isotopic composition of nitrate, concentration and isotopic composition of POC and PN, RNA sequencing, dissolved inorganic carbon system parameters, oxygen isotope composition of seawater, DMS and DMSP concentrations, and HPLC pigment analysis.
AlkalinityQuantity: number of stations = 11
Description: Discreet seawater samples collected for analysis of biogeochemical and biological parameters using the JCR's stainless steel 24-bottle Niskin rosette. A vertical profile was sampled at each of the 11 stations. Seawater samples were taken for later analysis of macronutrient concentrations, isotopic composition of nitrate, concentration and isotopic composition of POC and PN, RNA sequencing, dissolved inorganic carbon system parameters, oxygen isotope composition of seawater, DMS and DMSP concentrations, and HPLC pigment analysis.
IsotopesQuantity: number of stations = 11
Description: Discreet seawater samples collected for analysis of biogeochemical and biological parameters using the JCR's stainless steel 24-bottle Niskin rosette. A vertical profile was sampled at each of the 11 stations. Seawater samples were taken for later analysis of macronutrient concentrations, isotopic composition of nitrate, concentration and isotopic composition of POC and PN, RNA sequencing, dissolved inorganic carbon system parameters, oxygen isotope composition of seawater, DMS and DMSP concentrations, and HPLC pigment analysis.
Other chemical oceanographic measurementsQuantity: number of stations = 11
Description: Discreet seawater samples collected for analysis of biogeochemical and biological parameters using the JCR's stainless steel 24-bottle Niskin rosette. A vertical profile was sampled at each of the 11 stations. Seawater samples were taken for later analysis of macronutrient concentrations, isotopic composition of nitrate, concentration and isotopic composition of POC and PN, RNA sequencing, dissolved inorganic carbon system parameters, oxygen isotope composition of seawater, DMS and DMSP concentrations, and HPLC pigment analysis.
Biology and fisheries 
Phytoplankton pigs (eg chlorophyll, fluorescence)Quantity: number of stations = 11
Description: Discreet seawater samples collected for analysis of biogeochemical and biological parameters using the JCR's stainless steel 24-bottle Niskin rosette. A vertical profile was sampled at each of the 11 stations. Seawater samples were taken for later analysis of macronutrient concentrations, isotopic composition of nitrate, concentration and isotopic composition of POC and PN, RNA sequencing, dissolved inorganic carbon system parameters, oxygen isotope composition of seawater, DMS and DMSP concentrations, and HPLC pigment analysis.
Particulate organic matter (inc POC, PON)Quantity: number of stations = 11
Description: Discreet seawater samples collected for analysis of biogeochemical and biological parameters using the JCR's stainless steel 24-bottle Niskin rosette. A vertical profile was sampled at each of the 11 stations. Seawater samples were taken for later analysis of macronutrient concentrations, isotopic composition of nitrate, concentration and isotopic composition of POC and PN, RNA sequencing, dissolved inorganic carbon system parameters, oxygen isotope composition of seawater, DMS and DMSP concentrations, and HPLC pigment analysis.
ZoobenthosQuantity: number of stations = 19
Description: Shallow Water Camera system deployments
ZoobenthosQuantity: number of stations = 11
Description: Agassiz Trawls of benthic invertebrates
ZoobenthosQuantity: number of stations = 5