Woods Hole Oceanographic Institution
Cruise Planning Synopsis
AT42-17: Kelley "Pythia's Oasis" | |
Ship | |
R/V Atlantis | |
Vehicles | |
AUV Sentry, ROV Jason | |
Cruise Party | |
Deborah Kelley: Chief Scientist, Principal Investigator Univerity of Washington, School of Oceanography 1501 NE Boat St P.O. BOX 357940 Seattle, WA USA 98195 +1 206 685 9556 dskelley@uw.edu |
Departure: Sep 17, 2019 | |
Newport | |
Arrival: Oct 3, 2019 | |
Newport | |
Operations Area | |
Due west of Newport Oregon | |
Lat/Lon: 44° 29.0′ N / 125° 4.0′ W | |
Depth Range: 800 / 1400 | |
Will the vessel be operating within 200 NM of a foreign country? | NA |
Are visas or special travel documents required? | no |
Science Objectives | |
During a single remotely operated vehicle (ROV) dive in 2015, a remarkable seep site called Pythia’s Oasis was discovered 19 km inboard from the toe of the accretionary prism of the Cascadia Margin at a water depth of ~1040 m. The site is unlike any seep yet described along active margins, hosting an intense fluid-dominated venting system issuing low-salinity, hydrocarbon-bearing fluids at 11.8 C, greater than three times above background seawater values. The emanating fluids carry low concentrations of suspended particles from a discrete orifice, reminiscent of a mid-ocean ridge hot spring. The bubble component of the vent rises as a plume > 450 m into the overlying hydrosphere; it has been active for at least three years. A second adjacent site includes an extensive collapse zone hosting multiple seeps issuing diffuse, schlieren flow reflecting egress of warm and/or low salinity fluids. Two other plumes have also been documented. The goal of this two-year collaborative effort is to characterize the geology and chemistry of this extraordinary seep site to test three specific hypotheses:
1. Fluids originate from a meteoric source, and thus, play no role in the seismogenic behavior of the margin, but may contribute to element transport between land and ocean, impacting the current understanding of coastal hydrogeology. 2. Fluids originate from smectite-illite dehydration in the accreted sediments rather than at the plate boundary, providing important information on fluid production and overpressure development within the accretionary prism above the plate boundary. 3. Fluids originate from high temperature metamorphic reactions at depth in the seismogenic region of the Cascadia Subduction Zone (CSZ), resulting in extreme overpressures at the plate boundary. If so, either these dehydration reactions explain the partially locked behavior of the fault in this section of the margin or suggest that the locked seismogenic zone may not correspond to moderate overpressures as postulated for Nankai and Costa Rica. | |
Science Activities | |
During this expedition utilizing Jason and Sentry, the key science activities include 1) completing a high resolution bathymetric map of the Pythias site and surrounding area; 2) completing a photomosaic of the keep seep sites for documentation of the geology, tectonics, seeps, and associated biology, 3) conducting multiple surveys with Jason for sampling and seafloor/seep characterization; 4) fluid sampling of the seep sites using IGTs' and major samplers for fluid chemistry; collection of multiple push cores for pore fluid chemistry, 5) conduting a heat flow probe survey (Rob Harris-OSU) in a 'pogo' fashion; and 6) use of the OSU core facility infrastucture (Paul Walczak -container, flat rack, coring shack, and Hiab crane) to recover a series of cores. | |
Additional Info | |
Pre-cruise Planning Meeting: Teleconference | |
Stations: | |
Station 1 Distance: 50-60 Days: 16 Latitude: 44° 29.0 N Longitude: 125° 4.0 W | |
Supporting documentation: |
Funding |
Funding Agency: NSF | |
Grant or contract number: OCE 1658201 |
Scientific Instrumentation for R/V Atlantis |
Shipboard Equipment | |||||||||||
12 kHz Pinger for Wire Use | |||||||||||
A-Frame | |||||||||||
ADCP 75 kHz | |||||||||||
Bathymetry System 12 kHz | |||||||||||
Bathymetry System 3.5 kHz | |||||||||||
Crane | |||||||||||
Deionized Water System | |||||||||||
Fume Hood | |||||||||||
Multibeam | |||||||||||
Navigation - Heading | |||||||||||
Navigation - Position | |||||||||||
Science Underway Seawater System | |||||||||||
Sippican XBT System (Mark 21) | |||||||||||
Transponder Navigation - Sonardyne USBL | |||||||||||
Shipboard Communication | |||||||||||
Basic Internet access via HiSeasNet | |||||||||||
CTD/Water Sampling | |||||||||||
911+ Rosette 24-position, 10-liter bottle Rosette with dual T/C sensors | |||||||||||
SBE43 oxygen sensor | |||||||||||
Wet Labs C*Star transmissometer (660nm wavelength) | |||||||||||
Wet Labs ECO-AFL fluorometer | |||||||||||
Wet Labs FLNTURTD Combination Flourometer and Turbidity Sensor | |||||||||||
Critical CTD Sensors | |||||||||||
pH | |||||||||||
MET Sensors | |||||||||||
Air temperature | |||||||||||
Barometric Pressure | |||||||||||
Relative Humidity | |||||||||||
Short Wave Solar Radiation | |||||||||||
Wind speed and direction | |||||||||||
Sediment Sampling | |||||||||||
Gravity corers | |||||||||||
Sample Storage | |||||||||||
Climate Controlled Walk-in | |||||||||||
Freezer -70°C 25 cu. ft. | |||||||||||
Freezer -70°C 3.2 cu. ft. ea. | |||||||||||
Refrigerator 8.6 cu. ft. | |||||||||||
Scientific Walk-in Freezer | |||||||||||
Scientific Walk-in Refrigerator | |||||||||||
Storage Notes: | |||||||||||
Navigation | |||||||||||
Will you be using Long Base Line (LBL) navigation? | no | ||||||||||
How many nets? | null | ||||||||||
How many tansponders? | null | ||||||||||
Will you be using Ultra-short baseline (USBL) navigation? | no | ||||||||||
Navigation | |||||||||||
GPS | |||||||||||
USBL | |||||||||||
Navigation Notes: May conduct concurrent sentry and jason dives | |||||||||||
Winches | |||||||||||
CTD Winch with .322" Electro-mechanical wire | |||||||||||
Hydro Winch with .25" hydro wire | |||||||||||
Trawl Winch with 9/16th trawl wire | |||||||||||
Winch Notes: See note under OSU coring facility - during precruise meeting with Paul Walczak and Evan Solomon (Co-Chief) it will be important to talk about use of the Alvin LARS system for coring. | |||||||||||
Wire use and application | |||||||||||
CTD Winch with .322" Electro-mechanical wire | |||||||||||
Trawl Winch with 9/16th trawl wire | |||||||||||
Winch Notes: See note under OSU coring facility - during precruise meeting with Paul Walczak (OSU) and Evan Solomon (UW-Co-Chief) it will be important to talk about use of the Alvin LARS system for coring and for the heat flow probe (Rob Harris - OSU). | |||||||||||
Standard Oceanographic Cables | |||||||||||
|
Science Van 1 | |||
Type/size: Storage Van same size as blue Jason van | Location: Can store forward on Atlantis | ||
Water: | Power: | ||
Science Van 2 | |||
Type/size: Flat rack for cores - same size as storage van | Location: stored aft on the starboard side | ||
Water: | Power: | ||
Science Van 3 | |||
Type/size: Coring Shack | Location: starboard side just aft of the door for the CTD boom | ||
Water: | Power: | ||
Science Van 4 | |||
Type/size: Shipping container (may combine with 1st mentioned container above | Location: will discuss in precruise meeting | ||
Water: | Power: |
Specialized Deck Equipment
Mooring Deployment/Recovery Equipment Required: no | Type: |
Cruise Specific Science Winch Required: yes | Type: Heat flow and coring |
Nets Required: no | Type: |
Over the Side Equipment
Hiab crane - starboard side just aft of the door for the CTD boom for coring
Special Requirements
Elecrical Power: no | Identify |
Equipment Handling: no | Identify: |
Inter/intraship Communications: no | Identify: |
Science Stowage: no | Identify: |
Water: no | Identify: |
Additional Cruise Items/Activities
Hazardous Material
Will discuss during precruise
Radioactive Material
Additional Information
Jason-sentry dives, coring, and heat flow surveys
Scientific Instrumentation for HOV Jason |
Site Survey | |
Will you provide detailed charts of the work area(s)? | no |
If no, willl you need R/V Atlantis to generate maps of the work area(s)? | no |
Will you need post-dive maps of the work area generated? | no |
Navigation | |
Will you be using Long Base Line (LBL) navigation? | no |
How many nets? | null |
How many tansponders? | null |
Will you be using Ultra-short baseline (USBL) navigation? | no |
Will you be using Doppler/GPS navigation? | no |
What type of samples do you expect to collect? | Sediment, carbonates, animals (maybe), fluids (IGT's) and majors |
Elevators | |
Will you be using elevators to transport samples to the surface? | yes |
If yes, how many would you anticipate? | perhaps would like to have it onboard, but may not use |
Science Supplied Equipment | |
Are you supplying equipment to be used on HOV Jason | yes |
Has this equipment been used on Jason before? | yes |
Please give a brief description of the equipment, its intended purpose, the cruise # it was last used on if any and its deployment method.
We will supply the IGT gas-tight samplers - will have been used on AT42-12 Regional Cabled Array cruise | |
Does this equipment use an external pressure housing? | yes |
If yes, what is the pressure rating? | |
and test pressure? | |
Has the pressure housing been tested per Alvin Pressure Test requirements? | yes |
Pressure housing schematic with dimensions and include air and water weights. | |
Does the equipment have an associated computer or control panel for remote operation from the personnel sphere? | no |
Air weight of this equipment? | |
Water weight of this equipment? | |
Does the equipment require data or a power interface from the vehicle? | yes |
Does this equipment require hydraulic inputs from the vehicle? | no |
Hydraulic schematic of the equipment requirements. | |
Does this equipment require manipulation? | yes |
If yes, please describe how the equipment is to be manipulated:
Placement of nozzle in seep sites | |
Will this equipment be deployed off the vehicle? | no |
If yes, please describe how the equipment is intended for deployment:
No only includes placement by the manipulator into the sampling site | |
If yes, will the equipment be disconnected from the vehicle and left in situ? | no |
How long will the deployment be? | |
Will the equipment be recovered by the same vehicle? | no |
If recovering equipment deployed with another vehicle, provide pressure rating: | |
and test pressure: | |
Does this equipment use any glass spheres for either buoyancy or as pressure housings? | no |
Hazardous Material | |
Will hazardous material be utilized? | no |
Describe deployment method and quantity: | |
Additional Information | |
Brief operations description or comments: |
Scientific Instrumentation for AUV Sentry |
Site Survey | |
Will you provide detailed charts of the work area(s)? | yes |
If no, willl you need R/V Atlantis to generate maps of the work area(s)? | no |
Will you need post-dive maps of the work area generated? | no |
Navigation | |
Will you be using Long Base Line (LBL) navigation? | no |
How many nets? | null |
How many tansponders? | null |
Will you be using Ultra-short baseline (USBL) navigation? | no |
Will you be using Doppler/GPS navigation? | no |
Science Supplied Equipment | |
Are you supplying equipment to be used on HOV AbeSentry | no |
Has this equipment been used on AbeSentry before? | no |
Please give a brief description of the equipment, its intended purpose, the cruise # it was last used on if any and its deployment method. | |
Does this equipment use an external pressure housing? | no |
Has the pressure case been tested to the anticipated depth of deployment?& | no |
Pressure housing schematic with dimensions and include air and water weights. | |
Air weight of this equipment? | |
Water weight of this equipment? | |
Does the equipment require data or a power interface from the vehicle? | no |
Does the equipment meet the electrical requirements of the Sentry User Manual? | no |
Additional Information | |
Brief operations description or comments: |
Checklist & Notes |
Checklist | |
U.S. Customs Form: | no |
Diplomatic Clearance: | no |
Date Submitted: | |
Date Approved: | |
Agent Information: | |
Countries: | |
Notes: | |
Isotope Use Approval: | no |
Isotope Notes: | |
SCUBA Diving: | no |
Checklist | |
SSSG Tech: | |