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4. SIPEX_II_Stable_Isotopes_Si_N_C

Description

Overview of the project and objectives:

Assessing the contribution of the different N substrates to the primary production process, such as the biogenic silica production and dissolution in the Antarctic sea-ice provides a means to understand the biogeochemical system functioning. In such a semi closed-type system, assess incorporation rates of HCO3-, NO3-, NH4+, SiOH4, BSi dissolution, nitrification, C-release in close-by ice-cores (3 ice-cores dedicated to (i) 13C-assimilation + 15NH4+ uptake rate, (ii) 13C-assimilation + 15NO3- uptake rate and nitrification, (iii) Biogenic silica production and dissolution via 30Si isotope tool) will allow improving the knowledge of system functioning. This is also closely linked to the thematic of iron availability since these experiments are done close to / on the Trace Metal site allowing us to hopefully propose a relatively complete image of biogeochemical activity and relationship with trace metals on this site.

Methodology and sampling strategy:

Most of the time we worked close to / directly on the Trace Metal site following precautions concerning TM sampling (clean suits etc.). When we worked close to the TM site, precautions were not such important because we don't need the same drastic precautions for our own sampling. We work together because we want to propose a set of data which helps to characterize the system of functioning in close relation with TM availability (for that, sampling location have to be as close as possible). 14C and 13C-incubation experiment intercalibration work were conducted on the Biosite (different place than TM site except for station 7)

Incubation experiment samples are analyzed via (1) Elemental Analyzer - Isotope Ratio Mass Spectrometer (EA-IRMS) for carbon and nitrogen (VUB, Brussels, Belgium); (2) High Resolution Inductively Coupled Mass Spectrometer (HR-ICPMS) for silicon (RMCA, Brussels, Belgium).

Quality

Each eventual parameter important for global comprehension of the dataset is highlighted as comment, when needed, in the Final Sample List.xls file (see parent record).

Access

These data are linked to the parent record SIPEX_II_Stable_Isotopes

Temporal Coverages

• Start date: 2012-09-25 - Stop date: 2012-11-01

Spatial Coverages

Science Keywords

• EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NUTRIENTS
• EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > NITRATE
• EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > AMMONIA
• EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > CARBONATE

Use Constraints

This data set conforms to the CCBY Attribution License
(http://creativecommons.org/licenses/by/4.0/).

Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=SIPEX_II_Stable_Isotopes_Si_N_C when using these data.