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Process 2 Cruise Final Update from John Marra 
Sun Apr  9 18:49:03 1995

We spent today, Sunday, April 9th, packing up after completing the last station (30, the Arabesque site) yesterday. Just after breakfast this morning, John Andrews hosted the Thorium Cafe on the fantail piazza, patiently serving expressos and capuccinos to get us wired for putting away the gear. The onshore increase in productivity that we thought might happen never occurred. In fact, the increases in chlorophyll were confined to 15-17N (stations 19-26). North of that, the euphotic zone deepened. Even up on the shelf in 90 m of water depth, the profile of temperature, salinity and fluorescence looked very much like the top 80 m in the much deeper water we had just left. At station 30, we took time for a MER cast, a CTD to the bottom, and a last TM-rosette (for a PvI experiment). The water column again showed a fluorescence maximum at 40 m in a temperature gradient: very different from the surface maximum in chlorophyll seen last August (Chuck Trees). The nitrite max at 250 m disappeared by 18N, according to Kathy Krogslund but re-appeared again at the Arabesque site (sta30) further east. The zone of higher productivity in the SE line is about the same distance offshore as the maximum we saw on the NE transect. Of course, we can't tell if this is a basin-wide feature or localized to each area. We think it will turn out that the NE transect will be the more interesting, at least in terms of gradients. Whereas we saw little trend in the SE line, there were order of magnitude and greater changes in surface nutrient concentrations along the NE. But given that the NE line was mostly the shorter hydro and intermediate stations, it was difficult to appreciate the changes on the spot. We are miles away before results become available. We did 15 Double-MOCNESS tows, 15 Small-MOCs, 8 in situ primary production exoeriments (28 on-deck), 86 CTD's, 90 TM-rosette casts, 61 Slurpers, 27 PvI experiments, 14 MERs, 11 Monster rosette casts, 26 PAR/INF profiles, 8 INF deployments, 12 grazematic experiments, 230 bacterial production experiments, 28 nitrogen productivity experiments, and 12 days of dilution experiments and fecal pellet production experiments. We also did 400-500 each of DOC analyses, HPLC pigments, Turner chlorophylls, ap samples, POC's and PMC's, Fe and Al analyses, CO2-system analyses, Iodine analyses, and AO bacteria counts. Unlike to the south, there weren't any sharks milling around our sampling gear at these last stations. We did see, however, an acrobat show by a school of bottlenose porpoises as we steamed to station 26 (17N/58E). They performed back flips, twirls, and tail-slaps in the wake of the ship. Captain Gomes also reported passing two large manta rays a day later. john marra is