E-Mail
IMAGE: Ocean-bottom sediments, shown after materials such as leaf wax chemicals have been extracted. These sediments collected in 1985 by the Ocean Drilling Program were processed recently at UB. view more
Credit: Douglas Levere / University at Buffalo
BUFFALO, N.Y. Over hundreds of thousands of years, sediments from southern Greenland have been making their way into the ocean, where they re carried by underwater currents to a location in the Labrador Sea called the Eirik Drift.
Here, they settle on the ocean floor, where they form a record of history, accumulating in layers that document the environmental past of the lands from which they came.
19). Decreasing cell concentrations after drilling has also been observed in other CORKs [Juan de Fuca ridge flank; (
21)] and groundwater well systems (
5)], low cell counts likely indicate that the North Pond system had recovered from drilling and that the 2017 fluids (and resulting data) are the best representation of microbial activity in the cold, oxic crustal subseafloor aquifer to date.
Table 1 North Pond CORK fluids and bottom water values for cell enumeration, dissolved inorganic carbon (DIC), and dissolved organic carbon (DOC) from 2017 samples collected for this study.
Additional geochemistry (oxygen, nitrate, and pH) reproduced from (
5) also collected in 2017. Ammonium concentrations were all below detection (
reconstructed from sub-ice shelf and offshore sediments
J.A. Smith; C.-D. Hillenbrand; C. Subt; B.E. Rosenheim; T. Frederichs .
Abstract:
Because ice shelves respond to climatic forcing over a range of time
scales, from years to millennia, an understanding of their long-term
history is critically needed for predicting their future evolution. We
present the first detailed reconstruction of the Larsen C Ice Shelf (LCIS),
eastern Antarctic Peninsula (AP), based on data from sediment cores
recovered from below and in front of the ice shelf. Sedimentologic and
chronologic information reveals that the grounding line (GL) of an expanded
AP ice sheet had started its retreat from the midshelf prior to 17.7 ± 0.53
Oceans were stressed preceding abrupt, prehistoric global warming miragenews.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from miragenews.com Daily Mail and Mail on Sunday newspapers.
E-Mail
IMAGE: Using Sandia National Laboratories longstanding expertise in probabilistic modeling and machine learning algorithms from the U.S. Naval Research Laboratory, the researchers determined the probability of finding methane hydrate off the. view more
Credit: Image courtesy of William Eymold/Sandia National Laboratories
RALEIGH, N.C. Methane hydrate, an ice-like material made of compressed natural gas, burns when lit and can be found in some regions of the seafloor and in Arctic permafrost.
Thought to be the world s largest source of natural gas, methane hydrate is a potential fuel source, and if it melts and methane gas is released into the atmosphere, it is a potent greenhouse gas. For these reasons, knowing where methane hydrate might be located, and how much is likely there, is important.