Other ID: Hydrate Ridge SeepDOM
Status: Completed
Organization(s): USGS, Woods Hole Coastal and Marine Science Center, Woods Hole Oceanographic Institution, University of Maryland Center for Environmental Science, GEOMAR Helmholtz Centre for Ocean Research Kiel
Funding Program(s): USGS GAS HYDRATES (LQ000FP)
Principal Investigator(s): John Pohlman
Affiliate Investigator(s): Laura Lapham, University of Maryland Center for Environmental Science; Jeff Seewald, Woods Hole Oceanographic Institution; Jens Greinert, GEOMAR Helmholtz Centre for Ocean Research Kiel
Information Specialist(s): Michael Casso
Data Type(s): Sampling: Chemistry, Geochemical: Experiments (geochemical), Environmental Data: Methane
Scientific Purpose/Goals: Investigate production, flux and bioavailability of seep-derived dissolved organic matter
Vehicle(s):
Start Port/Location: Astoria, OR
End Port/Location: Astoria, OR
Start Date: 2023-08-11
End Date: 2023-08-20
Equipment Used: Pore water sampling, Niskin bottle, Push Point porewater samplers, Gas sampler, Cavity Ring-Down Spectroscopy (CRDS)
Information to be Derived: Chemical composition of pore fluids, gases and water column of seep area
Summary of Activity and Data Gathered: From Aug 12-Aug 19, 2023, water samples, sediment and pore fluids were collected from Hydrate Ridge and Astoria Canyon, offshore of Oregon, USA aboard the R/V Atlantis. 105 water samples were collected in Niskin bottles during nine CTD casts targeting Hydrate Ridge and areas in Astoria Canyon. 101 sediment and pore water samples were collected from six gravity cores collected in Astoria Canyon. 159 sediment and pore water samples were collected with a multi-corer at Hydrate Ridge and in Astoria Canyon. 203 sediment and pore water samples were collected from 29 push cores collected by the Alvin submersible. The samples were split for multiple analysis by the USGS and partnering institutions. USGS has analyzed, but not released, data for dissolved organic carbon from the pore fluids and the gases methane and CO2 from the water column samples. The data currently reside on John Pohlman’s hard drive and are backed up on the USGS OneDrive.
Staff:
Affiliate Staff:
Notes:
Location:
Hydrate Ridge methane seeps
| Boundaries | |||
|---|---|---|---|
| North: 45.5 | South: 44.5 | West: -234.5 | East: -238 |
Platform(s):
 Atlantis |
| Survey Equipment | Survey Info | Data Type(s) | Data Collected |
|---|---|---|---|
| Pore water sampling | --- | Chemistry | |
| Niskin bottle | --- | Chemistry | |
| Push Point porewater samplers | --- | Chemistry Temperature pH Dissolved Oxygen ORP Methane Nutrients | |
| Gas sampler | --- | Dissolved Oxygen Gas Hydrates Methane | |
| Cavity Ring-Down Spectroscopy (CRDS) | --- | CO2 Methane Experiments (geochemical) Surveys (geochemical) Chemistry |
