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Atmospheric circula...
Atmospheric circulation patterns associated with the variability of River Ammer floods : Evidence from observed and proxy data
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- Rimbu, Norel (author)
- Alfred-Wegener Institute for Polar and Marine Research, Potsdam
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- Czymzik, Markus (author)
- Lund University,Lunds universitet,Geologiska institutionen,Naturvetenskapliga fakulteten,Department of Geology,Faculty of Science,GFZ German Research Centre for Geosciences
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- Ionita, Monica (author)
- Alfred-Wegener Institute for Polar and Marine Research, Potsdam,University of Bremen
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- Lohmann, Gerrit (author)
- University of Bremen,Alfred-Wegener Institute for Polar and Marine Research, Potsdam
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- Brauer, Achim (author)
- GFZ German Research Centre for Geosciences
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(creator_code:org_t)
- 2016-02-23
- 2016
- English 9 s.
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In: Climate of the Past. - : Copernicus GmbH. - 1814-9324 .- 1814-9332. ; 12:2, s. 377-385
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Abstract
Subject headings
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- The relationship between the frequency of River Ammer floods (southern Germany) and atmospheric circulation variability is investigated based on observational Ammer River discharge data back to 1926 and a flood layer time series from varved sediments of the downstream Lake Ammer for the pre-instrumental period back to 1766. A composite analysis reveals that, at synoptic timescales, observed River Ammer floods are associated with enhanced moisture transport from the Atlantic Ocean and the Mediterranean towards the Ammer region, a pronounced trough over western Europe as well as enhanced potential vorticity at upper levels. We argue that this synoptic-scale configuration can trigger heavy precipitation and floods in the Ammer region. Interannual to multidecadal increases in flood frequency, as detected in the instrumental discharge record, are associated with a wave train pattern extending from the North Atlantic to western Asia, with a prominent negative center over western Europe. A similar atmospheric circulation pattern is associated with increases in flood layer frequency in the Lake Ammer sediment record during the pre-instrumental period. We argue that the complete flood layer time series from Lake Ammer sediments covering the last 5500 years contains information about atmospheric circulation variability on interannual to millennial timescales.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Oceanografi, hydrologi och vattenresurser (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Oceanography, Hydrology and Water Resources (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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