| Contributors | Affiliation | Role |
|---|---|---|
| Cochlan, William P. | San Francisco State University (SFSU) | Principal Investigator |
| Sambrotto, Raymond | Lamont-Doherty Earth Observatory (LDEO) | Principal Investigator |
| Bronk, Deborah A. | Virginia Institute of Marine Science (VIMS) | Co-Principal Investigator |
| Chandler, Cynthia L. | Woods Hole Oceanographic Institution (WHOI BCO-DMO) | BCO-DMO Data Manager |
N15 Uptake Rates
W.Cochlan,D.Bronk: N-15 absolute uptake rates R.Sambrotto: N15 Uptake rates for nitrate, ammonium and urea, POC, PON
| Parameter | Description | Units |
| event | event number from event log | |
| sta_name | unique station identifier | |
| sta | station number from event log | |
| cast | rosette cast number | |
| cast_type | CTD = CTD rosette | |
| bot | rosette bottle number | |
| depth_n | nominal sample depth | meters |
| pNH4 | ammonium uptake rate | nanogram atoms N/liter/day |
| pNO3 | nitrate uptake rate | nanogram atoms N/liter/day |
| pUrea | urea uptake rate | nanogram atoms N/liter/day |
| pNO2 | nitrite uptake rate | nanogram atoms N/liter/day |
| pNH4_uncorr | ammonium uptake rate, uncorrected for isotope dilution effect | micromoles N/liter/day |
| dfaa | dissolved free amino acid concentration | micromoles/liter |
| Urea | urea concentration (as nitrogen) | micromoles N/liter |
| POC | particulate organic carbon concentration | micromoles/liter |
| PON | particulate nitrogen concentration | micromoles/liter |
| Dataset-specific Instrument Name | Niskin Bottle |
| Generic Instrument Name | Niskin bottle |
| Dataset-specific Description | CTD clean rosette (Niskin) bottles were used to collect water samples. |
| Generic Instrument Description | A Niskin bottle (a next generation water sampler based on the Nansen bottle) is a cylindrical, non-metallic water collection device with stoppers at both ends. The bottles can be attached individually on a hydrowire or deployed in 12, 24, or 36 bottle Rosette systems mounted on a frame and combined with a CTD. Niskin bottles are used to collect discrete water samples for a range of measurements including pigments, nutrients, plankton, etc. |
| Dataset-specific Instrument Name | Trace Metal Bottle |
| Generic Instrument Name | Trace Metal Bottle |
| Dataset-specific Description | Trace metal (TM) clean rosette bottles were used to collect water samples. |
| Generic Instrument Description | Trace metal (TM) clean rosette bottle used for collecting trace metal clean seawater samples. |
| Website | |
| Platform | RVIB Nathaniel B. Palmer |
| Report | |
| Start Date | 1996-10-02 |
| End Date | 1996-11-08 |
| Description | Ross Sea Process Study 1 Methods & Sampling PI: William Cochlan and Deborah Bronk of: San Francisco State University (Cochlan), University of Georgia (Bronk) dataset: N-15 absolute uptake rates dates: October 23, 1996 to November 02, 1996 location: N: -76.4943 S: -76.5642 W: 169.0945 E: -177.8620 project/cruise: AESOPS/NBP-96-4A - Ross Sea Process 1 Cruise ship: R/V Nathaniel B. Palmer Methodology |
| Website | |
| Platform | RVIB Nathaniel B. Palmer |
| Report | |
| Start Date | 1997-01-13 |
| End Date | 1997-02-11 |
| Description | Ross Sea Process Study 2 Methods & Sampling PI: William Cochlan and Deborah Bronk of: San Francisco State University (Cochlan), University of Georgia (Bronk) dataset: N-15 absolute uptake rates dates: January 13, 1997 to January 27, 1997 location: N: -76.4927 S: -76.5153 W: 168.9581 E: 176.9902 project/cruise: AESOPS/NBP-97-1 - Ross Sea Process 2 Cruise ship: R/V Nathaniel B. Palmer Methodology |
| Website | |
| Platform | RVIB Nathaniel B. Palmer |
| Report | |
| Start Date | 1997-04-04 |
| End Date | 1997-05-11 |
| Description | Ross Sea Process Study 3 Methods & Sampling PI: William Cochlan and Deborah Bronk of: San Francisco State University (Cochlan), University of Georgia (Bronk) dataset: N-15 absolute uptake rates dates: April 12, 1997 to April 17, 1997 location: N: -73.9629 S: -76.4649 W: 169.0574 E: -177.9587 project/cruise: AESOPS/NBP-97-3 - Ross Sea Process 3 Cruise ship: R/V Nathaniel B. Palmer Methodology |
| Website | |
| Platform | RVIB Nathaniel B. Palmer |
| Report | |
| Start Date | 1997-11-05 |
| End Date | 1997-12-13 |
| Description | Ross Sea Process Study 4
SeaWiFS transmits images to U.S. JGOFS scientists aboard the Palmer, for first time on November 23, 1997. Methods & Sampling PI: William Cochlan and Deborah Bronk of: San Francisco State University (Cochlan), University of Georgia (Bronk) dataset: N-15 absolute uptake rates dates: November 16, 1997 to December 06, 1997 location: N: -76.4762 S: -76.563 W: 169.1610 E: -177.9637 project/cruise: AESOPS/NBP97-8, Ross Sea Process 4 cruise ship: R/V Nathaniel B. Palmer Methodology |
| Website | |
| Platform | R/V Roger Revelle |
| Report | |
| Start Date | 1997-12-02 |
| End Date | 1998-01-03 |
| Description | Polar Front Process I. Additional information about this cruise can be found at https://usjgofs.whoi.edu/aesops/aboutrr7.html Methods & Sampling PI: Raymond Sambrotto of: Lamont Doherty Earth Observatory dataset: N-15 uptake rates for nitrate, ammonium and urea, particulate N and particulate C dates: December 03, 1997 to December 30, 1997 location: N: -52.9388 S: -64.696 W: -174.7217 E: -168.8332 project/cruise: AESOPS/KIWI07 - APFZ Polar Front Process Cruise 1 ship: R/V Roger R. Revelle Sampling Methodology |
| Website | |
| Platform | R/V Roger Revelle |
| Report | |
| Start Date | 1998-02-13 |
| End Date | 1998-03-19 |
| Description | Polar Front Process II. Additional information about this cruise can be found at https://usjgofs.whoi.edu/aesops/aboutrr9.html Methods & Sampling PI: Raymond Sambrotto of: Lamont Doherty Earth Observatory dataset: N-15 uptake rates for nitrate, ammonium and urea, particulate N and particulate C dates: February 16, 1998 to March 14, 1998 location: N: -52.9668 S: -71.3072 W: -174.7317 E: -165.9148 project/cruise: AESOPS/KIWI09 - APFZ Polar Front Process Cruise 2 ship: R/V Roger A. Revelle Sampling Methodology |
The U.S. Southern Ocean JGOFS program, called Antarctic Environment and Southern Ocean Process Study (AESOPS), began in August 1996 and continued through March 1998. The U.S. JGOFS AESOPS program focused on two regions in the Southern Ocean: an east/west section of the Ross-Sea continental shelf along 76.5°S, and a second north/south section of the Southern Ocean spanning the Antarctic Circumpolar Current (ACC) at ~170°W (identified as the Polar Front). The science program, coordinated by Antarctic Support Associates (ASA), comprised eleven cruises using the R.V.I.B Nathaniel B. Palmer and R/V Roger Revelle as observational platforms and for deployment and recovery of instrumented moorings and sediment-trap arrays. The Ross-Sea region was occupied on six occasions and the Polar Front five times. Mapping data were obtained from SeaSoar, ADCP, and bathymetric systems. Satellite coverage was provided by the NASA SeaWiFS and the NOAA/NASA Pathfinder programs.
The United States Joint Global Ocean Flux Study was a national component of international JGOFS and an integral part of global climate change research.
The U.S. launched the Joint Global Ocean Flux Study (JGOFS) in the late 1980s to study the ocean carbon cycle. An ambitious goal was set to understand the controls on the concentrations and fluxes of carbon and associated nutrients in the ocean. A new field of ocean biogeochemistry emerged with an emphasis on quality measurements of carbon system parameters and interdisciplinary field studies of the biological, chemical and physical process which control the ocean carbon cycle. As we studied ocean biogeochemistry, we learned that our simple views of carbon uptake and transport were severely limited, and a new "wave" of ocean science was born. U.S. JGOFS has been supported primarily by the U.S. National Science Foundation in collaboration with the National Oceanic and Atmospheric Administration, the National Aeronautics and Space Administration, the Department of Energy and the Office of Naval Research. U.S. JGOFS, ended in 2005 with the conclusion of the Synthesis and Modeling Project (SMP).