| Contributors | Affiliation | Role |
|---|---|---|
| Sigman, Daniel M. | Princeton University | Principal Investigator |
| DiFiore, Peter | Princeton University | Contact |
| McKee, Theresa | Woods Hole Oceanographic Institution (WHOI BCO-DMO) | BCO-DMO Data Manager |
Nitrate and oxygen isotope data from the Southern Ocean
Related files and references:
DiFiore, P. J., D. M. Sigman, T. W. Trull, M. J. Lourey, K. Karsh, G.Cane, and R. Ho (2006), Nitrogen isotope constraints on subantarctic biogeochemistry, J. Geophys. Res., 111, C08016, doi:10.1029/2005JC003216.
DiFiore, P. J., D. M. Sigman, and R. B. Dunbar (2009), Upper ocean nitrogen fluxes in the Polar Antarctic Zone: Constraints from the nitrogen and oxygen isotopes of nitrate, Geochem. Geophys. Geosyst.,10, Q11016, doi:10.1029/2009GC002468.
| File |
|---|
Hydrocasts.csv (Comma Separated Values (.csv), 49.72 KB) MD5:b84b061cd0a53afddcbcf5ab77fc83b7 Primary data file for dataset ID 3571 |
| Parameter | Description | Units |
| cruise_ID | Cruise identifier | dimensionless |
| start_date | start date of dataset | YYYYMMDD |
| end_date | end date of data set | YYYYMMDD |
| date | date of sample | YYYYMMDD |
| lat | latitude | decimal degrees |
| lon | longitude | decimal degrees |
| cast | station number | dimensionless |
| time | Time of cast | HHMM |
| depth | depth of measurement | meters |
| Zmax | deepest sample depth | meters |
| NO3 | Nitrate | micromoles/liter |
| dN15_NO3 | delta 15N of dissolved nitrate relative to atmospheric N2 | per mil |
| d180_NO3 | delta_180_NO3 | per mil vs. SMOW |
| Website | |
| Platform | R/V Aurora Australis |
| Report | |
| Start Date | 1997-09-09 |
| End Date | 1997-09-22 |
| Website | |
| Platform | RVIB Nathaniel B. Palmer |
| Report | |
| Start Date | 2001-01-30 |
| End Date | 2001-03-28 |
| Website | |
| Platform | R/V Aurora Australis |
| Report | |
| Start Date | 1998-02-28 |
| End Date | 1998-04-01 |
| Website | |
| Platform | R/V Aurora Australis |
| Report | |
| Start Date | 1999-07-13 |
| End Date | 1999-10-07 |
| Website | |
| Platform | RVIB Nathaniel B. Palmer |
| Report | |
| Start Date | 2006-11-01 |
| End Date | 2006-12-15 |
| Description | This was the second of two Controls of Ross Sea Algal Community Structure (CORSACS) project cruises and was funded by the NSF Office of Polar Programs. The NBP0608 cruise was conducted in the Ross Sea in November and December 2006, ca. 65.21°S-78.65°S, 164.98°E-164.70°W.
Related files:
Cruise track map (PDF file)
Related Sites:
MGDS catalog: http://www.marine-geo.org/tools/search/entry.php?id=NBP0608 |
Nitrate is a ubiquitous form of biologically available nitrogen in the environment. Based on previous method development in the principal investigator's laboratory, CAREER graduate students and undergraduates investigate the nitrogen (N) and oxygen (O) isotopes of nitrate as 'tracers' of the N cycle, focusing on the marine environment. Research centers on two projects: (1) lab culture, in vitro assay, and field incubation studies of the coupled N and O isotope dynamics of nitrate assimilation and denitrification, two of the critical reactions in the N cycle; and (2) incorporation of the N and O isotopes of nitrate into numerical models of ocean circulation and biogeochemistry. These projects, in the context of the oceanic data sets generated in the principal investigator's laboratory, allow for the quantification of biogeochemical processes the signals of which are otherwise complicated by their simultaneous occurrence and by ocean circulation.
Oceanic data used in this project includes Nitrogen and delta 15N of dissolved nitrate relative to atmospheric N2 (dN15_NO3) collected during five cruises in the Southern Ocean -- in September, 1997, March, 1998, and August, 1998, February, 2001, and November 2006. During the last two cruises, samples of Oxygen isotopic composition (18O/16O) of nitrate (d180_NO3) were also collected.
Related files and references:
DiFiore, P. J., D. M. Sigman, T. W. Trull, M. J. Lourey, K. Karsh, G.Cane, and R. Ho (2006), Nitrogen isotope constraints on subantarctic biogeochemistry, J. Geophys. Res., 111, C08016, doi:10.1029/2005JC003216.
DiFiore, P. J., D. M. Sigman, and R. B. Dunbar (2009), Upper ocean nitrogen fluxes in the Polar Antarctic Zone: Constraints from the nitrogen and oxygen isotopes of nitrate, Geochem. Geophys. Geosyst.,10, Q11016, doi:10.1029/2009GC002468.
| Funding Source | Award |
|---|---|
| NSF Division of Ocean Sciences (NSF OCE) | |
| NSF Division of Ocean Sciences (NSF OCE) | |
| NSF Antarctic Sciences (NSF ANT) |