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Antarctic Isotopes
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2017
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Nathaniel B. Palmer
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Project Title: |
Estimation of Antarctic Ice Melt using Stable Isotopic Analyses of Seawater |
Project Status: |
Submitted |
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Principal Investigator: |
Robert Dunbar, Stanford |
Project Institution: |
Stanford |
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Project ID: |
105315 |
Version #: |
1 |
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Date Submitted: |
5/12/2016 7:41:00 PM |
Created By: |
Robert Dunbar |
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Date Last Modified: |
7/26/2017 3:59:00 PM |
URI Serial #: |
None |
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Funding Agencies: |
NSF/OPP/ANT - 1644118 - Funded |
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Summary of Field Work: |
Research objectives. This project focuses on using stable isotope ratios in Antarctic Shelf and Southern Ocean seawater to discriminate among different sources of freshwater with dual objectives of 1) estimating ice sheet melt rates, and 2) better understanding the partitioning of freshwater inputs among coastal Antarctic water masses. Successful use of the method requires the collection of high quality hydrographic data (Temperature and Salinity) as well as discrete samples from the water column by CTD rosette sampling systems. The target region is the Southern Ocean off the west coast of the Antarctic Peninsula as well as the Bellingshausen Sea, the Amundsen Sea, and the Ross Sea. We propose to engage “ships of opportunity” from a variety of national programs engaged in Antarctic research cruises, including the United States Antarctic Program. A UNOLS ship request form has been submitted.
Geographic region for field sites. Any cruises within the Ross Sea or coastal regions of the Thwaites Coast/Bellingshausen/Amundsen seas, or that transit (in either direction) between the scientific bases of the Antarctic Peninsula and those of the Ross Sea are good targets. U.S. vessels often make these transits as do the research vessels of Korea and (in the future) China. British vessels typically transit as far south as Rothera Station and Marguerite Bay. The simplest option for sample collection is to request that aliquots of seawater be taken from hydrocast rosette bottles by cruise participants. Samples are sealed in serum vials and sent to Stanford University for salinity and isotopic analysis. However, we also anticipate that on some cruises, a single berth is made available for a Stanford Ph.D. student to set up a Picarro CRDS isotope analyzer and Guildline Portasal portable salinometer. In this case, the student would collect hydrocast samples and analyze them in near real-time at sea.
Proposed field activities. Hydrocast data and sample collection from as many sites as possible within the targeted geographic region. Sites of greatest interest are those proximal to the glacial ice margins and we also prefer to have a number of samples from within shelf basins extending to the seabed. When we have a graduate student aboard a U.S. or other vessel, field activities also include analysis of salinity and stable isotopic composition of seawater. |
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Summary of Facility Requirements: |
Equipment installation. None is required for cruises wherein water samples are collected for us by others. On cruises where we set up the Portasal and CRDS instrument we need about 6 feet of benchtop space in an area with reasonably stable temperature. |
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Summary of other requirements and comments: |
Deployment schedule. Since we propose “ship of opportunity” sampling for a project designed to collect a large data set from areas that have mostly never been sampled, the deployment schedule will be dictated by cruise availability. We include the Nathaniel B. Palmer and Laurence M. Gould as “ships of opportunity for this project and ask for both samples to be taken by others for this project and the inclusion of a single shipboard scientist for appropriate cruises.
Numbers of personnel. We would like to deploy a single scientist where possible.
Equipment installation. None is required for cruises wherein water samples are collected for us. On cruises where we set up the Portasal and CRDS instrument we need about 6 feet of benchtop space in an area with reasonably stable temperature. |
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Type of Request: |
Ancillary |
Request Status: |
Submitted |
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Request ID: |
1008545 |
Created By: |
Robert Dunbar |
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Date Last Modified: |
5/12/2016 7:41:00 PM |
Date Submitted: |
5/12/2016 7:41:00 PM |
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Year: |
2017
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Ship/Facility: |
Nathaniel B. Palmer
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Optimum Start Date:
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12/15/2017 |
Dates to Avoid: |
none |
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Earliest Start Date: |
12/1/2017 |
Multi-Ship Op: |
No |
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Latest Start Date: |
2/28/2018 |
Other Ship(s): |
We could also use the LMG |
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Operating Days Needed: |
Science Days |
Mob Days |
De-Mob Days |
Estimated Transit Days |
Total Days |
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1 |
1 |
1 |
1 |
4 |
Repeating Cruise?
(within same year) |
No |
Interval: |
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# of Cruises: |
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Description of Repeating cruise requirements: |
N/A |
Justification/Explanation for ship choice, dates,
conflicts, number of days & multi-ship operations: |
See ship request for 2016 as part of this STR. |
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Short Description of Op Area
for use in schedules: |
West Antarctica |
| Description of Op Area: |
Coastal Seas off west Antarctica |
| Op Area Size/Dia.: |
2000 |
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Lat/Long |
Marsden Grid |
Navy Op Area |
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Beginning
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55.098° S
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67.066° W
map
55° 5.88' S
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67° 3.96' W
map
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Ending
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77.641° S
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165.405° E
map
77° 38.46' S
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165° 24.3' E
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.) |
N/A |
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Requested Start Port |
Intermediate Port(s) |
Requested End Port |
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Rada Punta Arenas, Chile |
None, , None, |
Hobart, Tasmania |
Explanation/justification for requested
ports and dates of intermediate stops
or to list additional port stops |
We will use whatever port the NBP or LMG go to for their scheduled cruises. |
Important Info on Working in Foreign Ports
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Chief Scientist: |
Robert Dunbar, Stanford |
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# in Science Party |
1 |
# 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 |
We don't need to be Chief Scientist. This is a piggyback project. |
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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. |
Need a CTD and Rosette.
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Explain Major Ancillary Facilities
Requirements and list description
and provider for "other" systems. |
CTD |
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