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EARTH SCIENCE > Oceans > Ocean Chemistry > Nitrate

12 record(s)

 

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  • Seawater samples were collected from 15m at the Rothera time series (RaTS) site from February 2005 until March 2007. During summer 2005-2006 samples were analysed using a GC-MS (gas chromatograph mass selective detector) set up in the Bonner laboratory. At all other times samples were stored on solid sorbents at -20C and returned to UEA for analysis. All trace gas seawater samples were extracted by purging and the resulting samples were analysed for selected alkyl nitrates and organohalogens using a GC-MSD. The instrument was set-up in the Bonner Laboratory at Rothera between November 2005 and April 2006. Sampling was not possible between mid-October and late December 2005 as the sea-ice remaining in the bay was not safe enough to traverse but was too abundant to launch a boat.

  • This dataset includes stable nitrogen isotopes of 1- nitrate in sea water (d15NNO3) from three sites (i.e. Southern Barents Sea, Northern Barents Sea, Greenland Sea) and 2- of bulk tissue (d15Nbulk) and compound specific stable nitrogen isotopes on amino acids (d15NAA) measured in adult harp seals from five sites (i.e. Southern Barents Sea, Northern Barents Sea, Greenland Sea, Labrador shelf, Baffin Island) and in adult ringed seals from two sites (Baffin Island and Canadian Archipelago) in the Arctic and sub-Arctic. The sea water samples for analyses of d15NNO3 were collected in 2017 and 2018 as part as two ARISE cruises (JR16006 and JR17005). The seal samples were collected from 2015 to 2019 as part of Norwegian commercial sealing and student field courses from the University of Tromso in Norway (Northern and Southern Barents Sea, Greenland Sea) and the Inuit subsistence and commercial harvests in Canada (Labrador Sea, Baffin Island, Canadian Archipelago). Analyses of d15NNO3 were carried out at the University of Edinburgh, UK. Analyses of d15Nbulk and d15NAA of seal muscle tissue were carried out at the Liverpool Isotopes for Environmental Research laboratory, University of Liverpool. Results are reported here in standard delta-notation per-mil relative to atmospheric N2. Funding was provided by the ARISE project (NE/P006035/1 and NE/P006310/1), as part of the Changing Arctic Ocean programme, funded by the UKRI Natural Environment Research Council (NERC).

  • Laboratory data assessing the environmental factors which control photochemical alkyl nitrate production in seawater collected from the Southern Ocean, 2003-2006

  • During passage from Stanley (Falklands Islands) to South Georgia, Stanley to Rothera and within the Western Core Box, 14 depth profiles, 70 surface seawater samples and 60 air samples were analysed for trace gas concentrations. In the Western Core Box, 6 CTD casts (3 off-shelf and 3 on-shelf) were carried out. Seawater and air samples were analysed for selected alkyl nitrates and organohalogens using a gas chromatograph - mass selective detector (GC-MSD). Data collected on biological and physical processes occurring within these regions was also used to compare alkyl nitrate and organo-halogen dynamics in these two geographically-close but hydrodynamically different ocean regions.

  • During 2005-2006 season, water samples were collected from Ryder Bay at the Rothera Time Series (RaTS) site. A biogeochemical profile of water samples was conducted at 5 depths: 0m (surface), 5m, 10m, 15m and 25m In addition to this, primary productivity measurements using 14C-sodium bicarbonate in conjunction with water-cooled light gradient (photosynthetron) and also nutrient uptake measurements using 15N labelled stable isotopes, were performed on the water samples.

  • Conductivity-Temperature-Depth (CTD) casts were conducted to describe the physical structure of the water column and to provide water samples for nutrient and particulate matter analyses from the James Clark Ross. A CTD transect was also conducted on a cruise across the mouth of Marguerite Bay (it was the intention to cover the entire mouth, but sea ice prevented this from happening), and through the trough leading towards the mooring sites. These casts were used to sample nutrients (NO3-, NO2-, Si(OH)4); nutrient isotopes 13DIC (dissolved inorganic carbon) 15NO3; bulk organic POC/PON (particulate organic carbon/nitrogen); bulk organic delta 13POC and delta 15PON.

  • The 2005-2006 field campaign was to determine alkyl nitrate and organo-halogen concentrations in the upper 100m of the water column at the Rothera Time Series (RaTS) site. Water samples were collected using a Niskin bottle hand winched to depths of 0, 5, 10, 15, 25, 50 and 100m. In total 12 depth profiles were obtained between 4 January and 4 March 2006. All trace gas seawater samples were extracted by purging and the resulting samples were analysed for selected alkyl nitrates and organohalogens using a gas chromatograph - mass selective detector (GC-MSD). The instrument was set up in the Bonner Laboratory at Rothera between November 2005 and April 2006. Sampling was not possible between mid-October and late December 2005 as the sea-ice remaining in the bay was not safe enough to traverse but was too abundant to launch a boat.

  • Lowered Acoustic Doppler Current Profiler (LADCP) and Conductivity Temperature Depth (CTD) data collected aboard the RRS James Clark Ross during cruises JR80 and JR110 in 2004. Data were used to calibrate instruments on four ocean moorings deployed in Shags Rock Passage, Scotia Sea. Four CTDs were used during JR110. Data includes continuous ocean profile data (surface to sea floor); temperature, salinity, pressure, current.

  • Argo floats measure temperature and salinity. Seven floats were deployed in November 2004 from the RRS James Clark Ross cruise JR110. Data were transmitted automatically to the British Oceanographic Data Centre (BODC).

  • Discrete ocean temperature, salinity and current measurements at four locations in Shag Rocks Passage. Moorings were deployed at 4 locations in Shag Rocks Passage (5255.6700S, 4745.5500W), (5255.6530S, 4745.9920W), (5302.5100S, 4802.7700W), (5302.5100S, 4802.3130W), (5309.0180S, 4829.9480W), (5318.2510S, 4854.8280W) from cruise JR080 in May 2004 and recovered on cruise JR110 in November 2004.