Departure at midnight with a steam directly to the mouth of Southwest Pass. We were able to get the salinity range we needed to develop a mixing curve in no time at all. Then to station A’1 at the earliest we have every gotten started on the transects. BUT, then the time on station, with some complications, made it one of the longest stations ever at this location. It always takes time to shake down the first station. Very low oxygen values on the nearshore end of transect A’1, as expected from data from the Wei-Jun Cai cruise the week before.
“Night” crew came on at 7 pm, finished the A’ stations, headed to transect A, then completed the line of stations from offshore to onshore. Again, extremely low oxygen values in the bottom waters at the nearshore end of transect A. At all those stations, lots of blue crabs swimming at the surface to avoid the low oxygen below. Lots of needle fish, and some menhaden. “Something” shaped like a small shark, but it was too far out of the lights for us to see.
Working hard to get a range of oxygen values for Winkler titrations so that we can correct DO values as necessary. (Go Wendy!) The CTD primary sensor matched the Winkler value at dockside, but not the YSI6820. And, based on “field” values, we will be doing some adjusting of DO. More values needed before we can start a “hypoxia” map.
Both crews too busy to think or do anything but focus on the first day. Photos and more detail to come. Oh, and 4 ft swells with sloppy side seas for the “day” crew, and flat calm for the “night” crew, as always.