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Hypoxia and Mn3
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2021
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Pelican
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Project Title: |
Collaborative Research: Manganese as a key reactant in the expanding low oxygen zones of the Gulf of Mexico, USA |
Project Status: |
Submitted |
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Principal Investigator: |
Veronique Oldham, URI_GSO |
Project Institution: |
URI_GSO |
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Project ID: |
106723 |
Version #: |
1 |
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Date Submitted: |
2/10/2020 9:51:00 PM |
Created By: |
Veronique Oldham |
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Date Last Modified: |
8/21/2020 8:35:00 PM |
URI Serial #: |
None |
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Funding Agencies: |
NSF/OCE/CO - 2022782 - Funded |
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Summary of Field Work: |
Characterization of the impact of deoxygenation on the cycling of Mn, N and C in the sediments and water column of the Gulf of Mexico. We aim to characterize the speciation of Mn in the soluble and particulate phase. As Mn is a strong redox reactant, we will assess how its speciation impacts the diagenetic reactions of Mn and C in sediements. In particular, we want to assess the stability of Mn(III)-L complexes, which we know are differentially stabilized based on the nature and availability of organic matter. Thus, we will conduct Mn, and N speciation, measure fluxes of Mn and N from the sediments to overlying water and characterize the sedimentary organic matter and organic ligand binding to Mn.
To conduct this research, we will use 3 research cruises over the course of 4 years, each cruise in a different season: Spring, Summer and Fall. This is because each season has different fluxes of both nutrients and organic matter. To characterize these fluxes, we will conduct vertical and horizontal transects, including a "source-to-sink" transect in the Mississippi River. We also include 3 shelf stations, of varying bottom water dissolved oxygen content, to assess how the oxygen content of the Gulf of Mexico impacts Mn speciation in the water column and its delivery to the sea floor. We will also measure rates of oxidation in the water column and oxic-anoxic interfaces, and grow Mn-oxidizing bacteria to compare abiotic and biotic oxidation rates. In the sediments, we will conduct porewater profiles of Mn, N and C, and deploy a benthic lander to measure fluxes from the sediments to overlying water.
Our overall goal is to characterize speciation, reaction rates and fluxes across 3 types of gradients (1) oxygen (2) salinity and (3) phase (solid to soluble). |
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Summary of Facility Requirements: |
We will need a CTD/Rosette - ideally a trace metal clean rosette (8-24 bottles), equipped with dissolved oxygen and pH sensors. We will need a multi-core and core sleeves. We sufficient deck space and an A-frame for benthic lander deployment. We need a radioisotope van for Mn-54 assays. We need space in the wet lab for a semi-clean bench space for metal assays. We need deck space for ship-board incubations - a flow through incubator would be desirable but not necessary. |
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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: |
1010827 |
Created By: |
Veronique Oldham |
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Date Last Modified: |
2/10/2020 9:51:00 PM |
Date Submitted: |
2/10/2020 9:51:00 PM |
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Year: |
2021
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Ship/Facility: |
Pelican
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Optimum Start Date:
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3/8/2021 |
Dates to Avoid: |
We need a spring sampling time-point. |
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Earliest Start Date: |
2/20/2021 |
Multi-Ship Op: |
No |
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Latest Start Date: |
4/2/2021 |
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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18 |
2 |
2 |
2 |
24 |
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: |
Gulf of Mexico |
| Description of Op Area: |
3 Stations in the Gulf of Mexico and 4 in a riverine transect up the Mississippi River. Gulf of Mexico stations are all on the shelf, near the mouth of the Mississippi. |
| Op Area Size/Dia.: |
305 |
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Lat/Long |
Marsden Grid |
Navy Op Area |
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Beginning
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28.993727° N
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89.975281° W
map
28° 59.62362' N
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89° 58.51686' W
map
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Ending
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42.038° N
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90.347° W
map
42° 2.28' N
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90° 20.82' 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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Cocodrie, LA, USA |
None |
Cocodrie, LA, USA |
Explanation/justification for requested
ports and dates of intermediate stops
or to list additional port stops |
No additional port stops
Home pot of LUMCON please |
Important Info on Working in Foreign Ports
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Chief Scientist: |
Veronique Oldham, URI_GSO |
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# in Science Party |
14 |
# 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 |
Oldham Party: Oldham + 3 students
Estes Party: Estes + 2 student
Robinson Party: Robinson + 2 students + 1 technician
Artist at sea from University of Iowa
Rhode Island Community College Student
University of Rhode Island Videographer |
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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. |
Use of multicore
Use of radioisotope van on deck (8' x 10')
Trace metal clean rosette
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Explain Major Ancillary Facilities
Requirements and list description
and provider for "other" systems. |
MC800 Multicore on Pelican
8' x 10' Rad van on Pelican
Trace metal clean rosette (anything with 8+ bottles) |
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