Purpose: [Leg 1 of Pacific Northwest expedition.] 12-hour day operations are planned for all three days. Day trips July 29–31 to sample the upper water column along four transects around Bodega Head, with the option to sample a fifth transect within Bodega Bay. The Dorado AUV Gulper / CTD vehicle and surface gears will be deployed from the R/V Rachel Carson. We plan to sample subsurface chlorophyll maxima along surface transects in a manner very similar to operations conducted in Spring 2014, northern Monterey Bay. Each day, we will deploy the Dorado AUV to run two different surveys, each covering a total of two sampling transects. We will subsequently conduct shipboard sampling at the terminal ends and/or within each of the AUV transects.
Chief scientist: Julio Harvey
Scheduled start time: 7/29/2014 1:00:00 PM UTC
[7/29/2014 6:00:00 AM Pacific]
Scheduled end time: 8/1/2014 12:30:00 AM UTC
[7/31/2014 5:30:00 PM Pacific]
Equipment: Equipment in the following list appears in order of deployment: 1) Dorado AUV / CTD vehicle for adaptive water sampling with 1.8 L Gulper bottles. We request two full sets (20 total) of AUV Gulper bottles on the ship, to facilitate quick turnaround of the AUV upon recovery. The primary AUV water-sampling algorithm will be “chlorophyll peak capture”. 2) Deck crane, winch and other equipment to deploy a single plankton net: Vertical sample to 30 m depth max — 0.75 m diameter (hoop) x 3 m long, 200 µm. 3) CTD/Niskin rosette with 2.5 L bottles (6 bottles total). We will use real-time chlorophyll measurements to adaptively sample within and around subsurface chlorophyll maxima. As in previous operations, we will deploy Steven Morgan’s plankton pump 2-inch PVC hose by attaching it to the CTD/Niskin rosette package. Plankton pumping will take place at each depth where Niskins samples are collected. On the first and last days of operations, the plankton pump and 2-inch PVC hose (~ 30 m) will need to be loaded and offloaded, respectively. RHIB boat transfers required (4¬–6 passengers depending on gear), in the event that the R/V Carson is unable to dock in Bodega due to high small boat traffic, characteristic of seasonal salmon fishing activity. Alternatively, if a local source of transport to and from the R/V Carson can be retained, this would save us considerable time, and result in better use of ship time. Hazardous materials: 95% ethanol