Deepest sediment core collected in the Atlantic Ocean
Team on the research vessel Neil Armstrong extracts core from the bottom
of the Puerto Rico Trench

Date:
April 21, 2022
Source:
Woods Hole Oceanographic Institution
Summary:
A team of scientists, engineers, and ship's crew on the research
vessel Neil Armstrong operated by the Woods Hole Oceanographic
Institution (WHOI) recently collected a 38-foot-long cylindrical
sediment sample from the deepest part of the Puerto Rico Trench,
nearly 5 miles below the surface.



FULL STORY ==========================================================================
A team of scientists, engineers, and ship's crew on the research vessel
Neil Armstrong operated by the Woods Hole Oceanographic Institution
(WHOI) recently collected a 38-foot-long cylindrical sediment sample
from the deepest part of the Puerto Rico Trench, nearly 5 miles below
the surface. The sample core is breaking records as the deepest ever
collected in the Atlantic Ocean, and possibly the deepest core collected
in any ocean.


==========================================================================
The event took place aboard a collaborative cruise in Puerto Rico
between February and March, 2022. The group responsible for the core
collection was led by Prof. Steven D'Hondt and Dr. Robert Pockalny from
the University of Rhode Island's Graduate School of Oceanography and
included researchers and technicians from WHOI, University of Rhode
Island, University of California San Diego, Oregon State University,
University of Washington, University of Puerto Rico Mayagu"ez, and
University of Munich.

Long sediment cores are generally collected by allowing a core pipe with
a lead weight on top to fall through the water and into soft sediment
that collects on the seafloor over long periods of time. When the pipe is pulled out of the seafloor and back up to the ship, the recovered sediment inside can be used to study Earth's environmental conditions and climate
dating back tens or hundreds of thousands, or even millions, of years ago.

Scientists are also interested in understanding genetic traits that
enable microscopic organisms to survive within seafloor sediments. The
main objective of this expedition was to better understand how microbes
at different depths below the seafloor have adapted to vastly different environmental conditions present across the entire depth range of the
trench. Over the course of three weeks at sea, the team collected cores
from a water depth of about 50 meters (165 feet) to the trench's maximum
depth of about 8,385 meters (27,510 feet).

"We took these cores to learn how microbes that live beneath the seafloor respond to pressure," said D'Hondt. "Our ultimate objective is to improve understanding of how organisms in extreme environments engage in the
world around them. "Our team's success in extracting this core from the
deepest part of the Atlantic Ocean will enable us to make a tremendous
advance in our understanding of this little-known part of life on Earth."
The core collections were made possible by the long core system originally developed at WHOI in 2007 by then-research specialist Jim Broda for the research vessel Knorr. After the ship's retirement, the system was adapted
to fit the slightly shorter vessel Neil Armstrong. After this expedition,
the long corer will be transferred to the OSU Marine Sediment Sampling
Group, which is funded by the U.S. National Science Foundation and
supports coring operations throughout the U.S. academic research fleet,
so it can be made available to the entire oceanographic community.

"This achievement was only possible thanks to phenomenal teamwork by
everyone involved, including those who helped develop the long corer
nearly 20 years ago," said Rick Murray, WHOI Deputy Director and Vice
President of Science and Engineering. "The fact that the long corer
will move to the capable hands of our friends and colleagues at Oregon
State University means it will have many more years of use by the ocean
science community to help advance knowledge about our planet."

========================================================================== Story Source: Materials provided by
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========================================================================== Related Multimedia:
* Deploying_sediment_corer_to_seafloor_of_Puerto_Rico_Trench ==========================================================================


Link to news story: https://www.sciencedaily.com/releases/2022/04/220421181215.htm

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