|
|
PacificArray
-
2021
-
Ocean/Intermediate
|
|
|
|
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 |
|
Principal Investigator: |
James B. Gaherty, NAU |
Project Institution: |
LDEO |
|
Project ID: |
105438 |
Version #: |
1 |
|
Date Submitted: |
8/5/2016 12:11:00 AM |
Created By: |
James B. Gaherty |
|
Date Last Modified: |
5/24/2018 2:24:00 PM |
URI Serial #: |
None |
|
Funding Agencies: |
NSF/OCE/MGG - 1658491 - Funded |
|
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. |
|
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. |
|
Summary of other requirements and comments: |
|
|
|
Type of Request: |
Primary Ship Use |
Request Status: |
Submitted |
|
Request ID: |
1008802 |
Created By: |
James B. Gaherty |
|
Date Last Modified: |
5/24/2018 2:24:00 PM |
Date Submitted: |
8/5/2016 12:11:00 AM |
|
|
Year: |
2021
|
Ship/Facility: |
Ocean/Intermediate
|
|
Optimum Start Date:
|
1/1/2021 |
Dates to Avoid: |
must be 12-15 months after previous deployment cruise |
|
|
|
|
|
|
Earliest Start Date: |
5/1/2020 |
Multi-Ship Op: |
No |
|
Latest Start Date: |
12/31/2020 |
Other Ship(s): |
monohull vessel (Revelle, Sally Ride, Thompson) preferred for OBS recoveries. |
|
|
Operating Days Needed: |
Science Days |
Mob Days |
De-Mob Days |
Estimated Transit Days |
Total Days |
|
15 |
1 |
2 |
12 |
30 |
Repeating Cruise?
(within same year) |
No |
Interval: |
|
# of Cruises: |
|
|
|
Description of Repeating cruise requirements: |
Technically not a repeating cruise since operations not exactly the same, but this is the last in a sequence of 4 cruises. Needs to be 12-15 months after third cruise. |
Justification/Explanation for ship choice, dates,
conflicts, number of days & multi-ship operations: |
Strongly prefer monohull ship (Revelle, Sally Ride, Thompson, etc.) for OBS recovery operations. Experience suggests that recoveries on the KM are difficult and (in the opinion of the OBS group) potentially unsafe if sea state is bad. We are particularly concerned about sea state given the relatively southern location. We would need to add an additional day or two of science time if the KM turns out to be the only option, as the operation is slower and requires more contingency. |
|
Short Description of Op Area
for use in schedules: |
SW Pacific |
| Description of Op Area: |
500x500 km area northeast of New Zealand |
| Op Area Size/Dia.: |
350 |
|
|
| |
Lat/Long |
Marsden Grid |
Navy Op Area |
|
Beginning
|
33° 18' S
/
158° 0' W
map
|
|
|
|
Ending
|
35° 30' S
/
151° 42' W
map
|
|
|
| |
Show Degrees Minutes |
|
|
|
|
|
Foreign Clearance Required? |
No |
Coastal States:
|
 Important Info on Foreign Research Clearances
|
|
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)?
|
No |
If yes, have you applied for the necessary permits through your export control office?
|
No |
| Questions about ITAR/EAR regulations?
|
Comments about foreign clearance requirements or
description of any other special permitting requirements
(e.g., MMPA, ESA, IHA, Marine Sanctuaries, etc.) |
NA |
|
|
Requested Start Port |
Intermediate Port(s) |
Requested End Port |
|
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
|
|
|
|
Chief Scientist: |
Zachary Eilon, UCSB |
|
# in Science Party |
12 |
# of different science teams |
1 |
# Marine Technicians to be
provided by ship operator:
(include in science party total)
|
1 |
|
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. Three student watchstanders, two PI/CoPI, 2 New Zealand participants. Might bring a couple of additional student participants if space available. |
|
 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 | | |
|
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. Dredging is only requested if backscatter from previous cruise shows volcanic rocks, and we have extra time to do samples.
|
|
|
|
Explain Major Ancillary Facilities
Requirements and list description
and provider for "other" systems. |
This is the final cruise out of a sequence of 4, each deploying or 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. |
|
