Physical oceanographers and marine chemists at the Leibniz Institute for Baltic Sea Research in Warnemünde returned from their latest monitoring cruise (2-14 February 2012) with good news: the autumn gales of November/December 2011 had spilled a large amount of North-Sea water into the Baltic Sea.
Along with the salty water, oxygen is transported into the deep regions of the Baltic which otherwise had suffered even longer from deficiencies of this vital substance.
Nevertheless, the enthusiasm of the scientists remains within limits; the imported mass of salt of about one billion tons (1 Gt) falls clearly behind the earlier major Baltic inflow events in the winters of 2003 (with 2.0 Gt) and 1993 (3.4 Gt). These days, the recently injected water is found east of Bornholm Island as a well-oxygenated near-bottom layer of 20 m thickness. “Later this spring, we expect the inflow to reach also the Gotland Basin in the central Baltic Sea but it will hardly carry enough oxygen with it to ventilate the entire water body there for a longer period”, said Rainer Feistel, physical oceanographer at IOW, estimating the anticipated effects.
The lack of substantial inflows after 1983 had resulted in a pronounced decline in salt and oxygen concentrations in the deep Baltic until 1993. As a consequence, fish like cod that needs salty and oxygen-rich water for spawning decreased significantly. Salinity gradually returned to normal by the inflow events of 1993, 1997 and 2003, as well as by frequent novel, noticeably warm small inflows in late summers.
In contrast, oxygen recovered only temporarily for 1-2 years after a strong winterly inflow. Accordingly, cod catches increased in the subsequent years. As a result of the current inflow, we may hope for similar effects in the years to come.Contact address:
Dr. Barbara Hentzsch | idw
Not of Divided Mind
19.01.2017 | Hertie-Institut für klinische Hirnforschung (HIH)
CRISPR meets single-cell sequencing in new screening method
19.01.2017 | CeMM Forschungszentrum für Molekulare Medizin der Österreichischen Akademie der Wissenschaften
An important step towards a completely new experimental access to quantum physics has been made at University of Konstanz. The team of scientists headed by...
Yersiniae cause severe intestinal infections. Studies using Yersinia pseudotuberculosis as a model organism aim to elucidate the infection mechanisms of these...
Researchers from the University of Hamburg in Germany, in collaboration with colleagues from the University of Aarhus in Denmark, have synthesized a new superconducting material by growing a few layers of an antiferromagnetic transition-metal chalcogenide on a bismuth-based topological insulator, both being non-superconducting materials.
While superconductivity and magnetism are generally believed to be mutually exclusive, surprisingly, in this new material, superconducting correlations...
Laser-driving of semimetals allows creating novel quasiparticle states within condensed matter systems and switching between different states on ultrafast time scales
Studying properties of fundamental particles in condensed matter systems is a promising approach to quantum field theory. Quasiparticles offer the opportunity...
Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.
As part of the “ArKol – development of architecturally highly integrated façade collectors with heat pipes” project, Fraunhofer ISE together with its partners...
19.01.2017 | Event News
10.01.2017 | Event News
09.01.2017 | Event News
19.01.2017 | Earth Sciences
19.01.2017 | Life Sciences
19.01.2017 | Physics and Astronomy