Wecoma report, 7-8 June

Two days of very little wind and calm seas. We started a bigbox survey from north to south at 0700 Thursday 6/7. The aircraft overflew us on the inshore end of line 2. We visually inspected the north inner shelf mooring and all appeared in order (we sent digital pictures to the mooring group). We completed the Cape Perpetua line (line 6) on Friday evening. All southern moorings were visually accounted for during daylight. We will finish the bigbox survey around 1000 Saturday morning. We then will transit to the offshore end of the CP line to do a day/night MOCNESS tow comparison, followed by CTD+nutrients+Fe and vertical zooplankton net tows in on the CP line on Sunday. During station work, we'll replace the ac-9 on the SeaSoar with an experimental nitrate sensor and fly a final bigbox from south to north on Monday and Tuesday.

While surface temperatures are warm (as also reported by the aircraft) and the upper ocean reflects the lack of wind, the upwelled pycnocline continues to exist and the upwelling jet continues to the south. On the inshore end of line 7, we sampled a very strong set of internal solitons, recording signals in the SeaSoar hydrography, SeaSoar chlorophyll light absorption and in the HTI bio-acoustics. Long surface slicks of concentrated foam were noted for some of the waves.

Written 9:20pm Fri 6/8

Jack Barth