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Underway N2 Fix.
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2015
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Atlantic Explorer
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Project Title: |
CAREER: METHOD DEVELOPMENT FOR HIGH-RESOLUTION UNDERWAY N2 FIXATION MEASUREMENTS |
Project Status: |
Submitted |
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Principal Investigator: |
Nicolas Cassar, Duke |
Project Institution: |
Duke |
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Project ID: |
103944 |
Version #: |
1 |
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Date Submitted: |
6/14/2013 10:56:00 AM |
Created By: |
Nicolas Cassar |
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Date Last Modified: |
3/21/2014 12:38:00 PM |
URI Serial #: |
None |
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Funding Agencies: |
NSF/OCE/CO - 1350710 - Funded |
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Summary of Field Work: |
Ship testing of the proposed method will be conducted on a total of 3 cruises. Through a DUNCOC grant (Duke/University of North Carolina Oceanographic Consortium), the PI had received funding for a 5-day cruise in the second half of Yr 1 in the original submission. Now that the R/V Cape Hatteras has been retired, the PI requests funding through NSF for ship time on the R/V Atlantic Explorer in Yrs 2-4 onboard the R/V Atlantic Explorer in the Sargasso Sea, an oceanic region suited for testing of the proposed method. To the best of our knowledge, our results would represent the first report of underway oceanic N2 fixation measurements. We will compare these estimates with independent estimates of N2-fixation rates using the GC-FID approach. The cruise track has been chosen to cover a large gradient in potential N2 fixation rates. The August cruise date is based on the study of Orcutt et al. (2001) which shows that N2 fixation rates peak at the end of the summer at the Bermuda Ocean Time-Series (BATS). |
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Summary of Facility Requirements: |
Underway seawater access and CTD measurements along the cruise track from Bermuda to the Sargasso Sea. |
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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: |
1006303 |
Created By: |
Nicolas Cassar |
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Date Last Modified: |
6/14/2013 10:56:00 AM |
Date Submitted: |
6/14/2013 10:56:00 AM |
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Year: |
2015
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Ship/Facility: |
Atlantic Explorer
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Optimum Start Date:
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8/6/2015 |
Dates to Avoid: |
Summer cruise only, as N2 fixation is maximized during summer |
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Earliest Start Date: |
6/15/2015 |
Multi-Ship Op: |
No |
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Latest Start Date: |
8/31/2015 |
Other Ship(s): |
PLEASE NOTE: This work was originally planned on R/V Cape Hatteras, which is now retired. |
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Operating Days Needed: |
Science Days |
Mob Days |
De-Mob Days |
Estimated Transit Days |
Total Days |
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10 |
0 |
0 |
0 |
10 |
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: |
Sargasso Sea |
| Description of Op Area: |
Transect from Bermuda to Sargasso Sea |
| Op Area Size/Dia.: |
600 |
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Lat/Long |
Marsden Grid |
Navy Op Area |
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Beginning
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32° 18' N
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64° 46.998' W
map
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Ending
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36.1167° N
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69.5833° W
map
36° 7.002' N
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69° 34.998' W
map
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Show Degrees Minutes |
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Foreign Clearance Required? |
No |
Coastal States:
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 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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St. George's, Bermuda |
None |
St. George's, Bermuda |
Explanation/justification for requested
ports and dates of intermediate stops
or to list additional port stops |
Short deployments on R/V Atlantic explorer offer several benefits: 1) The Sargasso Sea, one of the prime regions where oceanic N2 fixation (“hotspot”) has profound influence on the region’s biogeochemistry (Fig. 7) (Gruber 2004, Capone et al. 2005), is easily accessible from the home port of the R/V Atlantic Explorer in Bermuda. 2) The Bermuda Institute of Ocean Sciences, with its cutting-edge facilities, will be available for tuning and marine trials of the method prior to the cruise. |
Important Info on Working in Foreign Ports
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Chief Scientist: |
Nicolas Cassar, Duke |
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# in Science Party |
18 |
# of different science teams |
1 |
# 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 |
Scientist party will consist of graduate students, technicians, and science educators who will use Skype to reach remote students.
Underway uncontaminated seawater lines will be used, and some CTD stations. |
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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. |
Underway uncontaminated seawater lines will be used, and some CTD stations.
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Explain Major Ancillary Facilities
Requirements and list description
and provider for "other" systems. |
Underway uncontaminated seawater lines will be used, and some CTD stations.
Stable isotope 15N incubations will be performed. |
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