Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

What happens to the NAO? - Recent statistical analyses reveal loss of predictability

04.11.2014

A recently published article in the journal „frontiers in ecology and evolution“ by Joachim Dippner, Caroline Möller and Ingrid Kröncke showed by statistical analyses that the close coupling between climatic and biological data as it was valid for the period between 1977 – 2000 no longer is detectable in the following years.

The North Atlantic Oscillation (NAO), this interplay between Azores High and Icelandic Low, is decisively influencing the winter climate on the Northern Hemisphere. It is already known since the 1990s that there are four prevailing modes:

(1) a positive NAO phase, defined by an increased westdrift directing mild and humid air to Europe, (2) a negative NAO phase with strong conditions of easterly winds and cold winters in Europe as well as two blocking situations over (3) Scandinavia and (4) Western Europe.

Among the long series of meteorological readings, statistical analyses clearly reveal phases of consistent climatic regimes. Joachim Dippner and his co-authors have focused on three of them: a regime from 1977 to 1988 with NAO- predominant, a NAO+ regime from 1989 to 2000 as well as the following period until 2013. In parallel, they investigated the changes among the dominant species and taxonomic groups of the benthic macrofauna and the benthic community in the Southern part of the North Sea off Norderney.

The result shows that the shift between the two regimes NAO+ and NAO- also known as regime shift – is also reflected in changes within the benthos – the marine communities living on or in the seafloor.

After 2000, the picture changes considerably: a persistent NAO regime can no longer be detected. The authors name the NAO´s behavior chaotic. Simultaneously, abrupt changes occur in the benthic communities. They no longer can be related to any dominant NAO mode. Thus, future scenarios referring to the development of the ecosystems become increasingly difficult.

These findings were published under:
Dippner, J. W., C. Möller and I. Kröncke (2014). Loss of persistence of the North Atlantic Oscillation and its biological implication. Front. ecol. evol. 2: 57, doi:10.3389/fevo.2014.00057

Contact:
PD Dr. Joachim Dippner, Sektion Biologische Meereskunde, Leibniz-Institut für Ostseeforschung Warnemünde, Tel.: 0381 5197 229

Dr. Barbara Hentzsch, Öffentlichkeitsarbeit, Leibniz-Institut für Ostseeforschung Warnemünde, Tel.: 0381 5197 102

The IOW is a member of the Leibniz Association to which 89 research institutes and scientific infrastructure facilities for research currently belong. The focus of the Leibniz Institutes ranges from Natural, Engineering and Environmental Science to Economic, Social, and Space Sciences and to the humanities. The institutes are jointly financed at the state and national levels. The Leibniz Institutes employ a total of 17.200 people, of whom 8.200 are scientists, of which 3.300 are junior scientists. The total budget of the Institutes is more than 1.5 billion Euros. Third-party funds amount to approximately € 330 million per year. http://www.leibniz-gemeinschaft.de

Dr. Barbara Hentzsch | idw - Informationsdienst Wissenschaft

More articles from Ecology, The Environment and Conservation:

nachricht Conservationists are sounding the alarm: parrots much more threatened than assumed
15.09.2017 | Justus-Liebig-Universität Gießen

nachricht A new indicator for marine ecosystem changes: the diatom/dinoflagellate index
21.08.2017 | Leibniz-Institut für Ostseeforschung Warnemünde

All articles from Ecology, The Environment and Conservation >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: The pyrenoid is a carbon-fixing liquid droplet

Plants and algae use the enzyme Rubisco to fix carbon dioxide, removing it from the atmosphere and converting it into biomass. Algae have figured out a way to increase the efficiency of carbon fixation. They gather most of their Rubisco into a ball-shaped microcompartment called the pyrenoid, which they flood with a high local concentration of carbon dioxide. A team of scientists at Princeton University, the Carnegie Institution for Science, Stanford University and the Max Plank Institute of Biochemistry have unravelled the mysteries of how the pyrenoid is assembled. These insights can help to engineer crops that remove more carbon dioxide from the atmosphere while producing more food.

A warming planet

Im Focus: Highly precise wiring in the Cerebral Cortex

Our brains house extremely complex neuronal circuits, whose detailed structures are still largely unknown. This is especially true for the so-called cerebral cortex of mammals, where among other things vision, thoughts or spatial orientation are being computed. Here the rules by which nerve cells are connected to each other are only partly understood. A team of scientists around Moritz Helmstaedter at the Frankfiurt Max Planck Institute for Brain Research and Helene Schmidt (Humboldt University in Berlin) have now discovered a surprisingly precise nerve cell connectivity pattern in the part of the cerebral cortex that is responsible for orienting the individual animal or human in space.

The researchers report online in Nature (Schmidt et al., 2017. Axonal synapse sorting in medial entorhinal cortex, DOI: 10.1038/nature24005) that synapses in...

Im Focus: Tiny lasers from a gallery of whispers

New technique promises tunable laser devices

Whispering gallery mode (WGM) resonators are used to make tiny micro-lasers, sensors, switches, routers and other devices. These tiny structures rely on a...

Im Focus: Ultrafast snapshots of relaxing electrons in solids

Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!

When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...

Im Focus: Quantum Sensors Decipher Magnetic Ordering in a New Semiconducting Material

For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.

Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

“Lasers in Composites Symposium” in Aachen – from Science to Application

19.09.2017 | Event News

I-ESA 2018 – Call for Papers

12.09.2017 | Event News

EMBO at Basel Life, a new conference on current and emerging life science research

06.09.2017 | Event News

 
Latest News

Rainbow colors reveal cell history: Uncovering β-cell heterogeneity

22.09.2017 | Life Sciences

Penn first in world to treat patient with new radiation technology

22.09.2017 | Medical Engineering

Calculating quietness

22.09.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>