Jul
30
Filed Under (Uncategorized) by shearmar on 30-07-2009
Section of east/west (top) and north/south (bottom) currents on the Oregon shelf

Section of east/west (top) and north/south (bottom) currents on the Oregon shelf

Our first ADCP (acoustic Doppler current profiler) velocity section across the shelf (east/west currents above and north/south currents below). The section runs east/west from 124 W to about 124 38.5W along 45 8.4N. You can see the southward (blues) flowing coastal upwelling jet at the surface on the shallow end (centered around the 40 m isobath), and *lots* of surface poleward (yellows and reds) flow spanning most of the shelf. I have a feeling we’ll be chasing the dye to the north …

Jul
30
Filed Under (Uncategorized) by Robert on 30-07-2009

We sailed from Newport this morning and began surveys of our worksite early this afternoon.   Leaving Yaquina Bay, we found the views the same as we found them last month – with cold fog on the coast and 105 degree weather in the valleys to the east.

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We have chosen to move our injection site north to avoid a repeat collision with shallow pinnacles that grounded our vehicle in May.  We ran survey lines along the 25, 30, 35 and 40m isobath and also collected ocean current data with the 600 kHz ADCP.   We are now running a long section out to 500m water depth (~30 miles) to gather more information on currents that will help us decide where to inject the dye.      Or survey this morning brought us within one half mile of Haystack Rock and the Pacific City beach … but the FOG was so thick that we could barely see one end of the ship from the other.    (Map images courtesy of C. Romsos, OSU).

Work area for the Carbon study group during early August.   Bathymetric and current surveys shown below

Work area for the Carbon study group