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  • Weichselian  (1)
  • floods  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    SOLAR ACTIVITY VARIATIONS RECORDED IN VARVED SEDIMENTS FROM THE CRATER LAKE OF HOLZMAAR – A MAAR LAKE IN THE WESTEIFEL VOLCANIC FIELD, GERMANY (1997)
    Springer
    Surveys in geophysics 18 (1997), S. 163-182 
    Details
    ISSN: 1573-0956
    Keywords: Eifel ; Germany ; Holocene ; lacustrine sediments ; solar forcing ; varves ; Weichselian
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Annually laminated sediments from Lake Holzmaar (Germany) provide high resolution sedimentological and palaeoenvironmental data of the last 22,500 years. Weichselian periglacial varves and Holocene organic varves indicate different depositional environments. For the best preserved sections from both parts, spectral analyses were performed in order to detect cyclic fluctuations in varve thickness. Weichselian varves are dominated by an 88 year periodicity. Linear spectral analysis of Holocene varves provides no significant cyclicity. But, supposing nonlinear transformations of the solar signal through the Lake Holzmaar ecosystem during the Holocene, an adequate nonlinear spectral analysis method was able to detect periodicities of 11, 88, and 208 years. The existence of these cyclicities, comparable to the solar activity fluctuations, give further evidence for the existence of a sun-climate relationship, based on a not yet completely understood mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006531825130
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    Paper (German National Licenses)
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  • 2
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    Interannual to millennial-scale variability of River Ammer floods and its relationship with solar forcing (2021)
    Details
    Publication Date: 2021-10-26
    Description: The relationship between River Ammer flood frequency variability, extreme summer climate over Europe, and solar forcing is investigated. First, we used observational data to evaluate extreme weather and climate anomaly patterns associated with flood and solar forcing as well as the possible dynamical mechanisms behind them. Then, the annual resolution flood layer record from the Lake Ammer sediments is analysed to evaluate millennial-scale variability of floods and possible related extreme climate patterns back to 5,500 years BP. A composite analysis reveals that observed River Ammer flood frequency variability at interannual to multidecadal time scales is connected to large-scale extreme precipitation and temperature patterns. From a synoptic-scale perspective, the extreme precipitation pattern associated with floods is related to an increase in the frequency of high upper-level potential vorticity (PV) events over western Europe and a decrease over eastern Europe and western Russia. Increased (decreased) frequency of upper-level high PV events is related to more (less) surface extreme precipitation occurrence. Furthermore, we show that increased frequency of upper-level high PV events over western Europe is associated with enhanced blocking activity over eastern Europe. Therefore, the out of phase interannual to millennial-scale variations of River Ammer flood frequency and solar irradiance, as presented in previous studies, can be explained by a solar modulation of eastern European-western Russia summer blocking and associated upstream upper-level wave breaking activity. In addition, we identify two distinct quasi-periodic signals in both frequency of Lake Ammer flood layer and solar irradiance records with periods of ~900 years and ~2,300 years. We argue that similar cycles should dominate millennial-scale variations of blocking activity in eastern Europe-western Russia as well as extreme precipitation and flood frequency variability over central and western Europe during the last ~5,500 years.
    Keywords: 551.6 ; floods ; extreme precipitation ; potential vorticity ; solar forcing
    Language: English
    Type: map
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    CITATION GEO-LEO
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