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ETP N2 fixation
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2015
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Roger Revelle
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Project Title: |
Collaborative Research: Dinitrogen fixation rates and diazotrophic communities in contrasting oxygen regimes of the Eastern Pacific Ocean |
Project Status: |
Submitted |
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Principal Investigator: |
Margaret R. Mulholland, ODU_OEAS |
Project Institution: |
ODU_OEAS |
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Project ID: |
104013 |
Version #: |
3 |
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Date Submitted: |
8/7/2013 10:32:00 PM |
Created By: |
Margaret R. Mulholland |
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Date Last Modified: |
1/20/2014 11:08:00 AM |
URI Serial #: |
None |
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Funding Agencies: |
NSF/OCE/BIO - 1356056 - Funded |
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Summary of Field Work: |
During cruise transects to the the Eastern Tropical South Pacific (2015)and Eastern Tropical North Pacific (2016) and we will occupy 5 stations, 3 within oxygen minimum zone (OMZ) waters and 2 adjacent to OMZ water and measure detailed vertical profiles of dinitrogen fixation and the abundance and diversity of diazotrophic organisms mediating this process. We will compare rate measurements and nifH gene abundance and diversity to the distribution of oxygen and dissolved nitrogen concentrations, light attenuation, and productivity of overlying surface waters. We will use a CTD mounted rosette to make hydrographic measurements and collect water samples that will be incubated, filtered and stored onboard. We will also conduct carbon enrichment experiments wherein in deck incubations of OMZ waters will be amended with dissolved and particulate matter, incubated over several days and sampled to measure rates of N2 fixation and the expression of nifH genes. We will measure productivity of both phytoplankton and heterotrophic bacteria using stable and radioisotopes. |
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Summary of Facility Requirements: |
We require a ship with an endurance of 25 days that is equipped with a CTD rosette and that has ample deckspace for incubators. We will require a designated area for radioisotope use. We project a science party of 10-12 scientists and students. |
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Summary of other requirements and comments: |
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Type of Request: |
Primary Ship Use |
Request Status: |
Submitted |
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Request ID: |
1006410 |
Created By: |
Margaret R. Mulholland |
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Date Last Modified: |
12/2/2013 4:53:00 PM |
Date Submitted: |
8/7/2013 10:32:00 PM |
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Year: |
2015
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Ship/Facility: |
Roger Revelle
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Optimum Start Date:
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2/15/2015 |
Dates to Avoid: |
We require cruise dates during the productive period in the ETSP |
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Earliest Start Date: |
1/15/2015 |
Multi-Ship Op: |
No |
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Latest Start Date: |
3/15/2015 |
Other Ship(s): |
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Operating Days Needed: |
Science Days |
Mob Days |
De-Mob Days |
Estimated Transit Days |
Total Days |
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22 |
1 |
0 |
2 |
25 |
Repeating Cruise?
(within same year) |
No |
Interval: |
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# of Cruises: |
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Description of Repeating cruise requirements: |
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Justification/Explanation for ship choice, dates,
conflicts, number of days & multi-ship operations: |
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Short Description of Op Area
for use in schedules: |
ETSP |
| Description of Op Area: |
We will work in and adjacent to OMZ waters in the Eastern Tropical South Pacific between approximately 13-30 degrees S and 70-85 degrees West. |
| Op Area Size/Dia.: |
about 1000 nm |
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Lat/Long |
Marsden Grid |
Navy Op Area |
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Beginning
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Ending
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Show Degrees Minutes |
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Foreign Clearance Required? |
Yes |
Coastal States:
Chile, Peru |
 Important Info on Foreign Research Clearances
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Are you or any member in your science party bringing in any science equipment items which are regulated for export by the International Traffic in Arms Regulations (ITAR) and/or the Export Administration Regulations (EAR)?
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No |
If yes, have you applied for the necessary permits through your export control office?
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No |
| Questions about ITAR/EAR regulations?
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Comments about foreign clearance requirements or
description of any other special permitting requirements
(e.g., MMPA, ESA, IHA, Marine Sanctuaries, etc.) |
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Requested Start Port |
Intermediate Port(s) |
Requested End Port |
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Rada de Arica, Chile |
None |
Rada de Arica, Chile |
Explanation/justification for requested
ports and dates of intermediate stops
or to list additional port stops |
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Important Info on Working in Foreign Ports
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Chief Scientist: |
Margaret R. Mulholland, ODU_OEAS |
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# in Science Party |
12 |
# of different science teams |
3 |
# Marine Technicians to be
provided by ship operator:
(include in science party total)
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1 |
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Explanation of Science Party Requirements and Technician Requirements |
Require a CTD technician |
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 Dynamic Positioning | ADCP | Multibeam | Seismic |
| Dredging/Coring/Large Dia. Trawl Wire | Stern A-frame | Fiber Optic (.681) | 0.680 Coax Wire |
| SCUBA Diving |  Radioisotope use - briefly describe | NO Radioisotope use/Natural level work | Other Operator Provided Inst. - Describe |
| 0 PI-Provided Vans - briefly describe | MOCNESS | | |
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Explain Instrumentation or Capability
requirements that could affect choice
of ship in scheduling. |
Will measure bacterial and primary productivity. We will use tritium and C-14, respectively.
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Explain Major Ancillary Facilities
Requirements and list description
and provider for "other" systems. |
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