Our goal was to move as much bottom sediment onto the ship as we could over the next two weeks. Our coring operations had a variety of purposes and extended all the way from near San Diego to the northern edge of Monterey Bay.
Description
Chief Scientists: Homa Lee, Brian Edwards. Sampling data (pistoncore, 3dot5khz, boxcore, Kastencore, vibratingcore, VanVeengrab) of field activity O-2-99-SC in Los Angeles Shelf, California from 06/17/1999 to 06/25/1999
Location
California
Summary
The first two days were dedicated to taking piston cores at locations that had been preselected by Bill Normark. Bills goal was to sample sedimentary reflectors that could be identified in the Huntec lines and subsequently dated. This chronologic information could then be used to estimate most recent movement on observed faults. In all, 12 pistons cores were taken, ranging in length up to 4 m. These, and all of the other sediment smples taken on our cruises, were logged for density, sound velocity, and magnetic susceptibility using our multi-sensor logger.
Info derived
During the first two days of the cruise, 12 piston cores were taken ranging in length up to 4 m. The cores and all sediment samples were logged for density, sound velocity, and magnetic susceptibility using a multi-sensor logger. The next five days, 20 piston cores, 15 vibracores, 31 box cores, 6 grab samples, and 1 kasten core were acquired. A bottom photograph was taken with each box core using Hank Chezars camera system. A representative of the City of Los Angeles Department of Sanitation sampled box cores for living things. Jon Kolak sampled some station stations as part of a study of hydrocarbons in sediment. The grab samples were taken for Pete Dartnell, who is working to use acoustic backscatter measurements as a measure of habitat. Five cores were taken for the Southern California Coastal Water Research Project to be analyzed for pesticides and metals. On June 25, a group of Monterey Bay Aquarium Research Institute scientists began a five-day piston-coring venture. 25 piston cores were taken for MBARI in three different environments; a heavily pockmarked area of Big Sur, a feature identified as "Smooth Ridge" in Western Monterey Bay, and the head of Monterey Canyon. The last day was spent in Monterey Bay taking 8 box cores for Jon Kolak. Roger Lewis will be using PB210 methods to determine accumulation rates, and jon will be looking at geochemical tracers to estimate the original source of the sediment.
Comments
related field activity -- O-1-99-SC (geophysics) for first 2 days of O-2-99-SC The next five days were committed to the Los Angeles Shelf Pollution and Waste Disposal Project. The goals of our project are to understand the sedimentology and oceanography of Santa Monica Bay, one of the most human-impacted offshore areas on the West Coast, and to use this understanding to forecast the fate of contaminated sediment. This is our last major sampling year, and we used this opportunity to obtain cores for a broad variety of purposes. In all, we acquired 20 piston cores, 15 vibracores, 31 box cores, 6 grab samples, and one very smelly Kasten core from a "sludge" deposit. We will be dating the piston, box, and vibracore samples using Pb-210 and C-14 techniques to develop a better understanding of sedimentation conditions in Santa Monica Bay during the late Holocene with special emphasis on the last 100 years. Chris Sommerfield, a USGS post-doc at Woods Hole, is focusing on the last few thousand years, and Clark Alexander, as part of a coop with the Skidaway Institute of Oceanography, is considering the last 100 years. A bottom photograph was taken with each box core using Hank Chezars camera system. A representative of the City of Los Angeles, Department of Sanitation, participated in one day of the cruise, sampling box cores for living things. Jon Kolak, a USGS post-doc in Menlo Park, sampled some stations as part of a study of hydrocarbons in sediment. The grab samples were taken for Pete Dartnell, who is working to use acoustic backscatter measurements as a measure of habitat. Five cores were taken for the Southern California Coastal Water Research Project to be analyzed for pesticides and metals. Our sampling work in Santa Monica Bay was hugely successful, and we now have adequate sample resources to complete our study.
Staff information imported from InfoBank
Homa Lee (USGS Western Region) - Chief Scientist
Brian Edwards (chief Scientist, USGS Western Region) - Co
Bill Robinson (USGS Western Region) - Electrical Technician
Jon Kolak (USGS Western Region) - Geochemist
Megan McQuarrie (ORAU) - Navigation
Wendy Dahl (Eco) - Navigation/FACS
Kathy Presto (ORAU) - Geologist/210 Pb
Gini Gandhok (Volunteer) - Geologist
Tim Elfers (Skidaway) - Geologist/210 Pb Specialist
Jim Nickels (ASI) - Vibracore Technician
Hal Williams (USGS Western Region, off 6/19/99, ) - Marine Technician
Chris Sommerfield (USGS Woods Hole) - Geologist
Hank Chezar (USGS Western Region, on 6/19/99, ) - Camera
Kevin O'Toole (USGS Western Region) - Marine Technician
Walt Olson (USGS Western Region) - Marine Technician
Roger Lewis (On and Off 6/23/99, 1500, 2300, ) - Biologist
Russ Brigendine - Captain
Jeff Stringer - 1st Mate
Paul Giron - 2nd Mate
Dave Malsch - Chief Engineer
Mike Hill - Cook
Joe Kelly - Deckhand
