Achim Brauer

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Achim Brauer (born February 12, 1958 in Dormagen ) is a German geoscientist and head of the Climate Dynamics and Landscape Development section at the German Research Center for Geosciences in Potsdam .

Life

Brauer studied at the University of Trier ; he graduated there in 1988. His diploma thesis dealt with the reconstruction of lake level changes and climate changes in the Holocene using the example of the Weinfelder Maar . He then worked in business for some time. In 1994 he received his doctorate with the dissertation Weichselzeitliche Seesedimente des Holzmaars - Warvenchronologie des Hochglacials and proof of climatic fluctuations . He spent a research stay in France and has been working at the Geo Research Center in Potsdam since 1999. There he heads the ICLEA (Institute for Integrated Climate and Landscape Development Analysis). Since 2010 he has also been an adjunct professor for climate dynamics and landscape development at the University of Potsdam . Before that he was a private lecturer.

research

Using drill cores, for example from lake sediments (such as the Eifel maars ), Brauer analyzed the development of the earth's climate, deals with varven chronology and microfaces analysis , quaternary geology , abrupt climate change and the interactions between man and climate.

In his dissertation he expanded the varven chronology up to 22,500 years BP in a time of the glacier breach in Central Europe, for which otherwise locally no pollen or radiocarbon dates were available. The seasonal allocation of the sediment sequence was achieved by identifying the period of the 87.7-year Gleißberg cycle (according to Wolfgang Gleißberg ) of solar activity in the sediments, which at the same time proves the influence of solar activity in the cold ages of the last Ice Age . He was also able to determine a sharp transition to organic varvae 13,900 years ago (with a transition area to the late glacial of around 350 years) and in the high phase of the glaciation two periods with increased wind activity that correlate with the marine Heinrich events (particularly cold climatic phases).

In 2008, together with colleagues from drill cores from the Meerfelder Maar, he reported an abrupt change in climate in Central Europe at the transition to the Younger Dryas (another cold snap at the end of the Late Glacial) around 12,700 years ago, corresponding to a sudden - from one year to the next - increase in wind strengths due to a changed circulation pattern probably of Atlantic west currents.

In 2012 he found a connection between a transition to a cooler, windier climate 2800 years ago in Central Europe (Homeric minimum) and a minimum of solar activity in sediment cores in the Meerfelder Maar (where the solar activity is read from the frequency of the isotope beryllium 10, which in the Minimum of solar activity increases). According to Brauer and colleagues, a relatively small attenuation of UV radiation in the upper atmosphere leads to a shift in the jet stream and the data indicate an abrupt climate change (within eight years) that follows the change in solar activity without any major delay.

At his institute he is also investigating the relationship between the climate and lake sediments due to recent processes, particularly at the Tiefen See and with Polish colleagues in Lake Czechowski on the Tuchel Heath in Poland.

Fonts

  • with Christoph Endres, Christina Günter, Thomas Litt, Martina Stebich, Jörg FW Negendank: High resolution sediment and vegetation responses to Younger Dryas climate change in varved lake sediments from Meerfelder Maar, Germany , in: Quaternary Science Reviews 18, 1999, p. 321 -329. Abstract

Web links

Individual evidence

  1. ↑ Published in the journal Documenta naturae, Palaeo-bavarian Geological Survey, 85, 1994, Abstract ( Memento of the original from May 10, 2013 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2Template: Webachiv / IABot / www.palaeo-bavarian-geological-survey.de
  2. ↑ List of jointly appointed professors of the Institute for Earth and Environmental Sciences at the University of Potsdam ( Memento of the original from November 29, 2014 in the Internet Archive ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2Template: Webachiv / IABot / www.geo.uni-potsdam.de
  3. ↑ Press release of the Free University of Berlin from June 13, 2008
  4. ↑ "Mostly quickly and abruptly" My scenario , PNN, August 15, 2007
  5. ↑ Between the ages of 15,500 and 16,500 years BP and between 18,500 and 19,500 years
  6. ↑ Achim Brauer, Gerald Hauk, Peter Dulski, Daniel Sigman, Jörg Negendank: An abrupt wind shift in western Europe at the onset of the Younger Dryas cold period, in: Nature Geoscience, 1, 2008, pp. 520-523.
  7. ↑ Markus Becker: Climate history: a weakening sun triggered an ancient cold period, Spiegel Online, 2012
  8. ↑ Martin-Puertas, Brauer u. a., Regional atmospheric circulation shifts induced by a grand solar minimum, Nature Geoscience, 5, 2012, 397-401
personal data
SURNAME Brewer, Achim
BRIEF DESCRIPTION German geoscientist
DATE OF BIRTH February 12, 1958
PLACE OF BIRTH Dormagen