Field Activity 2012-009-FA

Identifier 2012-009-FA
Purpose Complete a shelf-cross and downslope transect in the Central US Beaufort Sea at roughly the longitude of Flaxman Island, going from shoreline to ~1500 m water depth. Collect seismic data, seafloor imagery, and water column imagery, as well as continuous CH4/CO2 data, water samples for methane oxidation rate determinations, and CTDs.
Location Central US Beaufort Sea continental shelf
Summary Week 1: Collected ~500 km of MCS data with 24 channel GeoEel; Chirp 424 was beyond its depth range for large part of surveys, but some data obtained to about 400-500 m water depth; SwathPlus never worked. Humminbird data not usable; During week 2, occupied 12 'stations' on inner shelf and at location of proposed drilling transect. Collected methane bottle samples, samples for methane oxidation rate determinations, and CTD data. Also ran continuous isotope CRDS and regular CRDS to use in determining CH4 fluxes at ocean-atmosphere interface.
Info derived Samples and chemical analysis;Bathymetric maps;
Comments Project = Gas Hydrates/Energy Component,
50-feet long, 4 foot draft.
Start Deadhorse, AK 2012-08-04
End Deadhorse, AK 2012-08-19
Days in the field 14
West -150.293
East -144.4043
North 72.12794
South 70.0356


384 Woods Hole Road
Quissett Campus
Woods Hole, MA02543-1598
(508) 548-8700
Principal investigators Carolyn RuppelJohn Pohlman
Crew members
Eric Moore
Scientist, Staff
Michael Casso
Scientist, Staff
Charles R Worley
Scientist, Staff
Information specialist(s)
Carolyn Ruppel
Specialist, Information
Affiliate principal Patrick Hart--PCMSC (USGS)
Affiliate staff Mary Woo (Pack), UC Irvine

Data types and categories

Data category: Environmental Data, Location-Elevation, Sampling, Seismics, Sonar
Data type: CTD, Methane, Navigation, Chemistry, Sparker, Sub Bottom Profiler, Interferometric, Single Beam, Multichannel

Equipment used

Equipment Usage description Data types Datasets
CTD 19+ with OBS, PAR, DO, Chl CTD (no data reported)
Humminbird fishfinder Single Beam (no data reported)
SEA SWATHplus-M 234 kHz Never worked Interferometric (no data expected)
HYPACK Navigation (no data reported)
Sparker Sparker (no data reported)
EdgeTech 424 chirp sub-bottom profiler Sub Bottom Profiler (no data reported)
Water sampler Chemistry (no data reported)
Cavity Ring-Down Spectroscopy (CRDS) CO2, Methane, Experiments (geochemical), Surveys (geochemical), Chemistry (no data reported)
DGPS Navigation (no data reported)
Multichannel seismics Multichannel (no data reported)


Samples collected during this field activity