After comparing sites in both oceans, they found the Arctic site to be more acidic, warmer during the summer months, and have fewer nutrients; those disparities account for the differences in vulnerability. The results were published in Nature Science Reports.
The polar oceans are sensitive to increasing global temperature and increasing concentrations of atmospheric carbon dioxide (CO2). The impacts of climate change are expected to be particularly large in ice-covered regions. Up until this project, the Arctic and Southern Oceans remained under-studied at the annual scale compared to other oceans, with the majority of observations restricted to the ice-free summer and autumn seasons.
“Thanks to this research, we now better understand the interplay of various climate and biogeochemical drivers in controlling ocean pH and carbonate saturation state in polar regions," says Dr. Helmuth Thomas. "Climate and biogeochemical conditions make the marine Arctic ecosystem more vulnerable than the Antarctic ecosystem, with potentially severe consequences for peoples living at the Arctic coastline."
The team compared two high-resolution observational data sets of complete annual cycles for sites in the Arctic and Antarctic oceans (Amundsen Gulf and Prydz Bay, respectively). They found that the Arctic site experienced greater seasonal warming (10 vs 3 degrees Celsius), and freshening (by 3 vs 2 salinity units), had lower alkalinity (2220 vs 2320 ìmol/kg), and lower summer pH (8.15 vs 8.5), than the Antarctic site.
The Arctic carbon system showed smaller seasonal changes than the Antarctic system. The team believes excess surface nutrients in the Antarctic may help reduce the extent of ocean acidification in that area and they beleve that the Arctic system may be more vulnerable to anticipated future changes in ocean pH and the carbonate saturation state.
Some carbonate shell forming species play crucial roles in polar foodwebs, and are relevant to human food supply. The team expects changes in pH and the carbonate saturation state to have detrimental effects for carbonate shell forming species and therefore potentially for human food supply. The team expects to see these effects decades earlier in the populated Arctic regions than in the unpopulated Antarctic regions.
Charles Crosby | Newswise
Scientists discover Earth's youngest banded iron formation in western China
12.07.2018 | University of Alberta
Drones survey African wildlife
11.07.2018 | Schweizerischer Nationalfonds SNF
For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.
To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...
For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.
Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...
Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.
A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...
Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.
"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....
Ultra-short, high-intensity X-ray flashes open the door to the foundations of chemical reactions. Free-electron lasers generate these kinds of pulses, but there is a catch: the pulses vary in duration and energy. An international research team has now presented a solution: Using a ring of 16 detectors and a circularly polarized laser beam, they can determine both factors with attosecond accuracy.
Free-electron lasers (FELs) generate extremely short and intense X-ray flashes. Researchers can use these flashes to resolve structures with diameters on the...
13.07.2018 | Event News
12.07.2018 | Event News
03.07.2018 | Event News
13.07.2018 | Event News
13.07.2018 | Materials Sciences
13.07.2018 | Life Sciences