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PacificArray
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2019
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Ocean/Intermediate
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Project Title: |
Collaborative Research: Imaging small-scale convection and structure of the mantle in the south Pacific: a US contribution to international collaboration PacificArray |
Project Status: |
Submitted |
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Principal Investigator: |
James B. Gaherty, NAU |
Project Institution: |
LDEO |
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Project ID: |
105438 |
Version #: |
1 |
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Date Submitted: |
8/5/2016 12:11:00 AM |
Created By: |
James B. Gaherty |
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Date Last Modified: |
5/24/2018 2:24:00 PM |
URI Serial #: |
None |
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Funding Agencies: |
NSF/OCE/MGG - 1658491 - Funded |
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Summary of Field Work: |
We are proposing two 12-15 month broadband OBS experiments in the south Pacific, each requiring cruises to deploy and recover instruments (4 cruises total). The first is centered at approximately 5S, 135W (east of the Marquesas), and the second is centered at approximate 35S, 155W (NE of New Zealand). Primary activity is deploying and recovering 30 broadband OBS for each experiment. We will also utilize multibeam and acoustic backscatter throughout the experiments. |
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Summary of Facility Requirements: |
Ship equipment (cranes and deck space) sufficient to support the deploying or recovery of 30 broadband OBS. A modern high-quality multibeam system is also needed. |
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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: |
1008801 |
Created By: |
James B. Gaherty |
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Date Last Modified: |
5/24/2018 2:05:00 PM |
Date Submitted: |
8/5/2016 12:11:00 AM |
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Year: |
2019
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Ship/Facility: |
Ocean/Intermediate
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Optimum Start Date:
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11/1/2019 |
Dates to Avoid: |
cruise would ideally avoid middle of southern hemisphere winter |
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Earliest Start Date: |
10/1/2019 |
Multi-Ship Op: |
No |
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Latest Start Date: |
4/1/2020 |
Other Ship(s): |
Revelle, Sally Ride, Kilo Moana. |
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Operating Days Needed: |
Science Days |
Mob Days |
De-Mob Days |
Estimated Transit Days |
Total Days |
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14 |
2 |
0 |
12 |
28 |
Repeating Cruise?
(within same year) |
No |
Interval: |
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# of Cruises: |
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Description of Repeating cruise requirements: |
Technically not a repeating cruise since operations not exactly the same, but this is the third in a sequence of 4 cruises. Ideally should be at least four months following third cruise to allow the OBS to be turned around for re-deployment, but if ideal ports are chosen to expedite OBS shipping, then as few as 3 months might be ok. |
Justification/Explanation for ship choice, dates,
conflicts, number of days & multi-ship operations: |
Primary timing constraint is leaving enough time for OBS turnaround, as described above. Secondary is to avoid southern hemisphere winter. We'd like to redeploy fairly soon after recovering the first array, but there is no scientific loss if we wait to deploy until sometime in the Jan-April 2020 timeframe if that results in better scheduling. |
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Short Description of Op Area
for use in schedules: |
SW Pacific |
| Description of Op Area: |
500x500 km area south of Tahiti, northeast of New Zealand |
| Op Area Size/Dia.: |
350 |
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Lat/Long |
Marsden Grid |
Navy Op Area |
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Beginning
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33° 18' S
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158° 0' W
map
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Ending
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35° 30' S
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151° 42' 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.) |
NA |
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Requested Start Port |
Intermediate Port(s) |
Requested End Port |
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Wellington, New Zealand |
None, |
Wellington, New Zealand |
Explanation/justification for requested
ports and dates of intermediate stops
or to list additional port stops |
Tahiti is slightly closer, but we are trying to encourage New Zealand to join the Pacific Array partnership, so for now using NZ. Will work with UNOLS and NSF to choose port with minimal overall costs. |
Important Info on Working in Foreign Ports
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Chief Scientist: |
James B. Gaherty, NAU |
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# in Science Party |
12 |
# 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 |
1 Restech with expertise in deck operations and quality multibeam data collection. 4 OBSIP techs for 24 hour ops. Four-six student watchstanders, two PI/CoPI, 2 New Zealand participants. Might bring a couple of additional student participants if space available. |
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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. |
OBSIP can provide crane/cable requirements but generally the typical UNOLS equipment is sufficient. If WHOI is selected as OBSIP provider, they will have a van.
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Explain Major Ancillary Facilities
Requirements and list description
and provider for "other" systems. |
This is the 3nd cruise out of a sequence of 4, deploying and recovering two OBS arrays. Timing constraints between cruises for OBS group: minimum of 3 months between recovery of the the first deployment and the start of the second deployment cruise, and 4 months is probably safer. The 3-month number is assuming that the ports are ones for which shipping of instruments back to SIO and then out again is not unusually slow (i.e. they typically assume about a month for shipping). For likely ports other than Honolulu or San Diego the shipping might be a bit slower than that, and 4 months is probably safer. Our ideal deployment time on the seafloor is 14 months, with 12 months being the absolute minimum for achieving the primary science goals. |
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