But it is not an effect of climate change but rather of increased inputs of nutrients and fertilisers. This is the finding of researchers at the University of Gothenburg, Sweden, who have analysed the ocean climate of the Baltic Sea since the 16th century.
85 million people live in the drainage basin of the Baltic Sea. This population has a great impact on the marine environment of the Baltic. This is shown by the researcher Daniel Hansson at the Department of Earth Sciences, who has analysed the ocean climate of the Baltic Sea since the 16th century using new methods.
In his thesis, Hansson notes that oxygen deficiency and spread of dead seabeds in the Baltic Sea are essentially due to human activity.
"Climate change to date has only had a negligible effect on oxygen deficiency in the Baltic Sea. The principal cause of oxygen deficiency and large areas of dead seabed is that inputs from agriculture and untreated wastewater increased sharply, in particular in conjunction with increased use of commercial fertiliser in the mid-20th century," says Hansson.
By combining new methods to reconstruct the historical climate and modern computer models, Hansson has been able to study in detail changes in water temperature, ice extent, river runoff, salinity and oxygen concentrations in the Baltic Sea over 500 years. The studies show clearly that the oxygen condition today cannot be compared with any other period since the 16th century, and that the present-day raised water temperature and limited ice extent are similar to situations that have occurred only twice previously.
Changes can come
"But if the trend towards continued warming persists, we may soon see climate change outside the variation that has occurred in the past 500 years," says Hansson.
The technique used in the thesis provides very high time resolution. Hansson has, for example, been able to reconstruct how the ice thickened during the turbulent days of January and February 1658, when King Charles X Gustav marched with the Swedish Army across the Little and Great Belt, leading to the annexation of Blekinge, Skåne, Halland and Bohuslän by Sweden.The thesis Ocean climate variability over recent centuries explored by modelling the Baltic Sea was publicly defended on 25 September.
Link to thesis: http://gupea.ub.gu.se/dspace/handle/2077/20827Contact:
Supercomputing helps researchers understand Earth's interior
23.05.2017 | University of Illinois College of Liberal Arts & Sciences
How is climate change affecting fauna in the Arctic?
22.05.2017 | Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung
An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.
We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...
Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.
Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...
An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...
In the race to produce a quantum computer, a number of projects are seeking a way to create quantum bits -- or qubits -- that are stable, meaning they are not much affected by changes in their environment. This normally needs highly nonlinear non-dissipative elements capable of functioning at very low temperatures.
In pursuit of this goal, researchers at EPFL's Laboratory of Photonics and Quantum Measurements LPQM (STI/SB), have investigated a nonlinear graphene-based...
Dental plaque and the viscous brown slime in drainpipes are two familiar examples of bacterial biofilms. Removing such bacterial depositions from surfaces is...
23.05.2017 | Event News
22.05.2017 | Event News
17.05.2017 | Event News
23.05.2017 | Physics and Astronomy
23.05.2017 | Life Sciences
23.05.2017 | Medical Engineering