A memorable day at sea

As I am writing this, the Gordon Gunter is in the final stages of surveying on Georges Bank.  We are in an area marked as Little Georges on the nautical charts, on the western edge of Georges Bank.  We arrived here by rounding Cultivator Shoals to the north this morning.  As we were working our way towards a station up there, a wonderful thing happened.  The heavy fog, which has surrounded us since we first reached Georges on Sunday, lifted, and we could see the sun!

Cruise Track Wed June 1 rd

Tracking our progress with a high-lighter on a chart and a finger puppet on the next position to be visited.  The red dot to the left of the finger puppet marks Cultivator Shoals which we sampled on the morning of June 1. Photo by Jerry Prezioso, NEFSC/NOAA Fisheries

At the same time, our marine animal observer on board, John Loch, from the Canadian Wildlife Service, was greeted with a profusion of marine wildlife to record: pilot whales, common dolphins and seabirds: Wilson Storm Petrels by the hundreds, Sooty and Greater Shearwaters, Fulmars, Red Phalaropes, Greater and South Polar Skuas, and Jaegers, to list some of them.  It’s been his busiest day of the cruise!

Meanwhile, our other work on board continues as before, foggy or not.

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John Loch, the Canadian Wildlife Service observer, at his post on the flying bridge of the Gordon Gunter. Photo by Jerry Prezioso, NEFSC/NOAA Fisheries

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Common dolphin seen near the Gordon Gunter. Photo by John Loch, Canadian Wildlife Service

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Black-back Gull chasing a Herring Gull.  Photo by John Loch, Canadian Wildlife Service

Our Princeton researcher, Jessica Lueders-Dumont, together with Bonny Clarke from the USGS (United States Geological Survey), continued her sampling of seawater, phytoplankton and zooplankton from the station that we visited in the Cultivator Shoals area this morning.  Her research aims to trace the path that nitrogen takes through the first steps of the marine food chain, by comparing the ratios of nitrogen 14 and 15 stable isotopes of this element in seawater, phytoplankton and zooplankton.

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Bonny Clarke working on the Princeton filtering rack. Photo by Jerry Prezioso, NEFSC/NOAA Fisheries

She captures the seawater and phytoplankton from different depths using our Niskin water bottle sampler, and the zooplankton samples she gets from a set of small bongo nets mounted above our larger ones during our plankton tows.  With filtering racks set up in the wet lab of the Gordon Gunter, Jess and Bonny have filtered hundreds of liters of seawater during this cruise to gather the data for this research.

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Bongo net array showing the small bongos used by Jessica Lueders-Dumont for capturing zooplankton to determine their nitrogen stable isotope ratios. Photo by Jerry Prezioso, NEFSC/NOAA Fisheries

With only a couple of days left in our cruise, it now looks like our mission of sampling three areas of the continental shelf – the Mid-Atlantic Bight, Southern New England and Georges Bank – will be accomplished.  We have been given a gift of weather here on Georges Bank, a notorious area where there is no lee from wind on any quarter.  I have been glad to live with the constant droning of our foghorn in return for the calm seas that came along with it.  Today of course, we have the best of all worlds; calm seas, no fog and a profusion of marine wildlife surrounding us.  Truly a memorable day at sea!

 

Jerry Prezioso
Chief Scientist
GU1608 Ecosystem Monitoring Survey

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