Monterey Bay Aquarium Research Institute
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 R/V Rachel Carson

Purpose: [Revised cruise plan to add a participant from UCSC.] Day trips October 16, 17, 20–22 to sample the upper water column in the northern Monterey Bay with the AUV Gulper / CTD vehicle and surface deployed gears from the R/V Carson. Our primary goal will be to sample subsurface chlorophyll maxima along two AUV transects (northern transect = T1, southern transect = T2) in the northern Monterey Bay’s upwelling shadow / retention zone with the AUV, plankton nets, and small (2.5 L bottles) CTD/Niskin rosette, in a manner similar to operations conducted in February of this year. We will first deploy the AUV at the nearshore end of northern transect T1 and then sample from the ship, at three stations along AUV transects T1 and T2 (beginning, midpoint, and endpoint for each). We will cease shipboard sampling as needed to recover the AUV and redeploy for a second mission if necessary. 12-hour day operations are planned for all days. However, we may reduce to 10 hour days on October 20-22 depending on sampling needs.

Chief scientist: Julio Harvey

Scheduled start time: 10/16/2014 1:00:00 PM UTC
[10/16/2014 6:00:00 AM Pacific]

Scheduled end time: 10/22/2014 11:30:00 PM UTC
[10/22/2014 4:30:00 PM Pacific]

Equipment: Equipment in the following list appears in order of deployment/use: 1) Dorado AUV CTD vehicle for adaptive water sampling with 20 newly installed Gulper bottles. The primary AUV water-sampling algorithm will be “chlorophyll peak capture”, but we may switch to the “3-waters” upwelling front detection algorithm if favorable conditions arise. 2) Deck crane, winch and other equipment to deploy a plankton net for vertical sampling to 30 m depth — 0.75 m diameter hoop x 3 m long, 200 µm. 3) Small CTD/Niskin rosette with 2.5 L bottles (12 bottles total), to sample three depths at each surface station: we will use real-time chlorophyll measurements to adaptively sample below, within and above subsurface chlorophyll maxima. Hazardous materials: 95% ethanol