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18-Apr-02 COAST Meeting Notes

(submitted 19 April, J. Barth)

We had two science talks from Burke Hales and Yvette Spitz. In between, we discussed meeting plans for '02 and cruise plans for '03. Here's a summary of those discussion, followed by brief reports on the science presentations.

The suggested time for the next monthly COAST meeting is May 23, 3:30pm. Mike Wetz volunteered to talk about deck incubation results. Perhaps Steve Pierce can offer remarks about HTI bioacoustics estimates of zooplankton. At some point we should ask Gary Egbert to give us a report on his work with tides (barotropic and internal) off Oregon.

At the suggestion of several COASTers, in particular our UNC colleagues, we discussed the timing of a summer workshop. To fit the workshop in between GLOBEC field work, it looks like a 3-day workshop either 17-19 or 22-24 July would work best. Would everyone please check their schedules and see if either of these won't work? Send your input to Jack.

We're still on track to request a special session at the Fall AGU mtg (6-10 Dec) with an abstract deadline of sometime in early fall (Sep?). A reminder that the EPOC mtg at Mt Hood (25-28 Sept) will have relevant sessions to COAST. EPOC is a great place to discuss results in a smaller meeting format, to interact with our west coast colleagues and to help spin-up an AGU talk.

We then discussed field plans for the downwelling experiment presently scheduled for Feb '03. Roger Samelson pointed out that some P3 airplane time may become available during that time frame through the efforts of Marty Ralph, NOAA/ETL. Pat Wheeler updated us on the fact that the R/V Thompson would likely be unavailable for our use due to its operations in the western Pacific. We then discussed the challenges with working on another large research vessel (e.g., the R/V Roger Revelle) after we'd already spent time getting the two-wire and pumping operations to work so beautifully on Thompson. Jim Moum raised the possibility of putting off the experiment until the winter of '03-'04. The pros and cons of this were discussed. As a reminder, the project ends at the end of CY04. Jim, Pat and Burke agreed to contact the Scripps people over the next few days to weeks to sort out the operation questions. It was noted that Revelle will be used for GLOBEC work in August '02 and will be in port at Newport from 23-25 June, on 28-30 July and again on 20 August. A decision on postponing was put off until we have more information about use of the Revelle. Input on this question (route to Jack, Pat or John) is welcome!

Burke Hales gave an overview of the pumped profiler operations conducted onboard R/V Thomas G. Thompson during the May and August 2001 COAST cruises. He explained the which variables were measured in situ on the towed sled (T, S, p, O2, fl, tr and PAR) and which were measured topside on the pumped water stream (S, suite of nutrients, pCO2 + the entire bio-optics of Cowles and Letelier). Burke showed 1-sec binned data from the CP line in May, showing much structure in T, S, O2, tr and pCO2. They cycled the profiler to 200m over the slope. Burke and his group are working on the processing of the nutrient data from both cruises. Jack asked that they prioritize the nitrate data from the end of the August cruise when the Wecoma passed by with the ISUS optical nitrate sensor onboard SeaSoar.

Yvette Spitz showed results from their 2D modeling of an upwelling ecosystem. These results are in press at JGR. The basic case is run for the CUE-II line at 45.25N. Note that this is "line 1" of the SeaSoar sampling and is farther north than the CH line at 45N, but bottom topographies are similar. Yvette outlined work in progress on a 3D ecosystem simulation. She also is ready for a model run using the COAST '01 data sets as initial conditions. Specifically she'd like fields of T, S, chl, nitrate, ammonium and zooplankton for the CP line. Pat immediately offered data for everything except the zooplankton from the pumped stations on the CP line. Bill Peterson's group should chime in with the status of their zooplankton counts for the CP line. Perhaps Steve Pierce could offer some bioacoustics-based estimates of zooplankton distributions.