Laboratory data assessing the environmental factors which control photochemical alkyl nitrate production in seawater collected from the Southern Ocean, 2003-2006
Zooplankton faecal pellet abundance, volume and flux were determined from samples collected at three stations in the Scotia Sea, Southern Ocean during cruise JR304. Samples were collected at six depths within the 0 - 400 m epi- to upper mesopelagic using Niskin bottles attached to a CTD unit and were preserved in a formalin-based solution. Fluorescence data were collected during the same deployments. Sampling was performed by C. Liszka and G. Tarling on board RRS James Clark Ross. Sample analysis was performed by C. Liszka at BAS HQ in Cambridge.
This dataset is referring to 2-year time series of particle flux, as measured by two deep moored sediment traps (P2, P3) located in the Southern Ocean (northern Scotia Sea sector), a globally important region of atmospheric CO2 drawdown containing both naturally iron-fertilised (P3) and iron-limited (P2) regimes. The dataset includes the main biogeochemical flux parameters (such as Bsi, POC and PIC) as well as the specific contribution of each part of the plankton calcifying community (pteropods, foraminifera, coccolithphores and ostracods) to the PIC within a period from April 2009 to February 2011. The dataset allows the estimation of the Carbonate Counter Pump (CCP), which causes an increase in surface ocean CO2 through the calcification and precipitation of carbonate.
Water samples were collected for chlorophyll and nutrient concentrations, biogenic and lithogenic silica concentrations, particulate organic carbon and nitrogen (POC/PON) concentrations, phytoplankton identification, Si, C, N, and Ge isotopes, particulate Ba, and other trace elements associated with suspended particles. Some samples were collected by small boat launched from Rothera research station and other seawater samples were collected from under the ice by divers. Water was also collected from RaTs (Rothera Oceanographic and Biological Time Series) CTD sites 1 and 2, and from Honeybucket (off Rothera Point). Brine was collected by drilling a hole, washing out and waiting for the hole to fill (sack-hole drilling). Blocks of ice were also collected and stored at -80 degrees C before being thawed for analysis. The sea-ice and brine was analysed for trace metals (Al, Zn, Cd and Co) for 5 different collection dates in 2004/2005.
Time-series data of bromocarbon compound concentrations - bromoform (CHBr3) and dibromomethane (CH2Br2) concentrations. These were collected at the Rothera Time-Series (RaTS) site, Marguerite Bay during the 2008-2009 field season.
Samples of seawater were collected from the upper watercolumn at the RaTS site and examined to assess bromocarbon production by different microalgal species and how this production varies with changing environmental conditions. The field report (see reference) supplies dates on which the samples were collected and the incubations were started, and the depths incubated.
Zooplankton data collected from 15 net hauls on James Clark Ross cruise JR58. Data relate mainly to krill and salps that entered the net during hauls where TUBA data were collected. Raw data held in Excel spreadsheets and include krill length photos. Plankton samples taken from nets have been collected. These are presently stored at BAS in the Marine Specimen Store. Analysis of these samples has been undertaken and samples should be retained for 5 years from completion of project and then assessed in light of other plankton datasets held. Nets were used to collect samples of zooplankton and micromekton.
Echo-sounding data collected using the hull-mounted Simrad EK500 aboard the James Clark Ross (cruise no JR58) in 2001. This formed part of a project to determine the structure of zooplankton aggregations through multi-frequency acoustics and nets. The echo-sounder was used during net hauls where the net-mounted TUBA, multi-frequency acoustic system, was deployed, and was used to identify suitable targets of zooplankton layers or swarms.