Past 48 hours of sampling….

Julie and Carlie get muddy while taking 6" and 4" sub-cores from the box core

Our fearless leaders make decisions about where to take sediment cores and water samples

On the continental shelf of Brazil we were surprised to find fragments of coral reef in one of our multicore deployments

February 26th

For the past 2 days we have been following a transect from deep ocean sites, westward toward the continental shelf of Brazil to look at the transport of fluvial sediments coming from the Amazon River. Our shallowest sampling site was in just 35 meters of water, and we were < 100 miles from the coast of Brazil. The water changed from the crystal clear blue color of the open ocean, to a muddy green/brown, indicating that we were close to the Amazon River outflow.

Enrique and Claudia deploy the in situ water pumps to filter particulates from seawater

The winch lowers the rosette, which has 24 niskin bottles, over the starboard side of the ship

Laura collects water from a niskin bottle that was deployed just above the seafloor

At each site we deployed the rosette (equipped with instrumentation that measures water parameters like salinity and temperature) to collect seawater samples at different depths in the water column. Laura and Kara filter the seawater (a process that takes 4 hours per deployment) to collect particulate matter, which they will analyze when we return to USF. We are also collecting box cores and multicores to analyze the most recently deposited sediments. Although a lot of our sampling took place in the wee hours of the morning, you can see that we weren’t shy about getting covered in mud. At one of the shallow sites, we were expecting soft sediment, but our cores came up with pieces of coral, brittle stars, and sponges, indicating that we had hit a reef.

Julie smooths the surface of the gravity core sediments to look for sedimentary structures

Julie and Claudia have fun with their proper safety attire on deck!


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