Unable to attend were: Greg Lough and Jeff Runge.
Jim Bisagni also attended.
Note: The meeting minutes are also availabe as a MS Word document.
This was the first meeting of the ExCo for Phase IV. The different funded proposals each selected two members their teams to be on the Committee. Peter Wiebe, as the outgoing chair, called the meeting to order. The election of a new chair was delayed until Charlie Flagg could arrive. Peter reviewed the agenda and asked for additional topics.
Charlie Flagg indicated that the shipboard ADCP has been done for a long time. He now is looking at the backscatter intensity. To do this he is going back to review the calibration of the various ADCP units to get calibrated backscatter intensity.
When the PO data are done, the group will get back to completing the chronology of physical events that was begun last fall.
The work on the 1999 tidal mixing front array data (Ron Schlitz) is being done in collaboration with a soon to be assistant scientist at WHOI.
Chen has made the transition to his finite volume model, and all future analyses will be done with that model. Preliminary work has shown that knowing the wind field over the whole Gulf of Maine region is important to the modeling. The surface forcing field will be derived using the MM5 model. This assimilates data (e.g., SST, scatterometer) during the analysis to give the atmospheric forcing fields that ultimately are input to his finite volume model. Chen is working with a colleague in Boston who uses MM5 routinely. Jamie indicated that there also is a major MM5 effort at UNH.
Jamie added to the summary of the modeling work underway by Chen: he has two domains – 300m and full depth. The first has problems with the tides, but is very efficient. Chen has developed climatologies for the tides, for the tides plus winds, and for the tides with quickscat winds. He now has modified MM5 with a new marine boundary layer and is planning to rerun the 1995 period and then do the 1999 period. It is not certain how output will be made available. He also will be doing dye experiments with the model (with Houghton), and is developing an 8 component NPZ model incorporated with the physics model.
Peter asked if the models could handle changes of the Northeast Channel inflows. This would require getting the upstream boundary conditions right.
2b) Zooplankton Population Dynamics on Georges Bank: Model and Data Synthesis
Jamie gave the summary for this group. Much of the work by Chen mentioned above applies here. Jamie has recently published a paper on turbulence and avoidance of it by zooplankton. A post-doc will be working on copepod life history modeling. Ted is working with Chen's student who is doing modeling for this project.
2c) Patterns of Energy Flow and Utilization on Georges Bank
Dian gave the summary for this group. The group has meet bi-monthly. Various data sets have been or are being prepared. Much of the initial effort has been on defining the spatial and temporal boundaries. Data formats for input into the model have been determined and will encompass bacteria to marine mammals. Steele and Beat have a preliminary model framework under development. The energy flow is based on tracking nitrogen and carbon through the trophic structure, during three time stanzas associated with the 1960's, the MARMAP years, and the GLOBEC years. The group is also looking at seasonal differences and regional differences on the Bank.
The discussion digressed into a ranging discussion of marine snow and the transport of phytoplankton to the seafloor on the Bank.
2d) Tidal Front Mixing and Exchange on Georges Bank
David Townsend gave the summary for this group. The group meet last fall. David has worked with Chen’s student on developing the model. And as mentioned above, Houghton will be working with Chen to do modeling dye experiments. David discussed his ideas about the bottom up control of production that may be affecting trophic structure on the Bank as a result of switches between Atlantic Slope Water and Labrador Slope Water coming into the Gulf of Maine. The latter has about half the nutrients loading compared to that of the Atlantic Slope Water. Long-term changes in source waters could have a significant impact.
2e) Integration and Synthesis of Georges Bank Broad-Scale Survey Results
Peter gave the summary. The group met last fall. One of the major issues to be addressed was to decide on a common grid and methods for interpolating data to that grid. David Mountain described the gridding exercise that is in progress. A grid was developed for an area surrounding the Broad Scale stations, using a 5 minute separation in latitude and longitude. Areas associated with each grid point were determined, so that an integrated value for a parameter could easily be determined. Example data sets for each of the primary parameters were created. Three techniques will be used to interpolate the observed values to the grid points – krigging, oax and 1/r2 interpolation. Characteristic variograms will be determined for each parameter using the EasyKrig software for the krigging. The exercise has been done for example larval fish distributions. While the estimated number of larvae for a particular survey varied with the different interpolation methods, the differences were very consistent. The ratio of abundance between two surveys was essentially the same for all of the methods, so that cruise to cruise comparisons would be independent of the interpolation method used.
Three sessions were noted in particular.
Physical-Biological Interactions in Marginal and Shelf Seas.
Co-Conveners: Wolfgang Fennel (Germany), Charles Hannah (Canada), and Henn Ojaveer (Estonia)
On the State and Stability of the northern North Atlantic:
Patterns and Trends.
Co-Conveners: Alicia Lavín (Spain), Harald Loeng (Norway), and Tom Rossby (USA)
5b) The next Ocean Sciences meeting will be January 26-30, 2004 in Portland, Oregon. We have until 7 May to request a special session for GLOBEC. This meeting is now run by AGU alone. The Oceanography Society and ASLO are holding the Ocean Research Conference on February 15-20 in Honolulu. The Committee decided to focus on the Ocean Sciences meeting. Peter will talk to the other GLOBEC programs to consider requesting a special session for GLOBEC-like presentations.
The tentative timing for the next RFP for Georges Bank (Phase 4.5). The focus/wording of that RFP is yet to be determined. But ideas from the Reykjavik workshop could help guide how some of the Georges Bank synthesis proposals are formulated.
An energetic discussion took place about basin scale transport and exchange of Calanus across the North Atlantic.
The meeting adjourned at 3 PM.