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Solar modulation of flood frequency in central Europe during spring and summer on interannual to multi-centennial timescales

Czymzik, Markus LU ; Muscheler, Raimund LU and Brauer, Achim (2016) In Climate of the Past 12(3). p.799-805
Abstract

Solar influences on climate variability are one of the most controversially discussed topics in climate research. We analyze solar forcing of flood frequency in central Europe during spring and summer on interannual to multi-centennial timescales, integrating daily discharge data of the River Ammer (southern Germany) back to AD1926 (∼solar cycles 16-23) and the 5500-year flood layer record from varved sediments of the downstream Ammersee. Flood frequency in the River Ammer discharge record is significantly correlated to changes in solar activity when the flood record lags the solar signal by 2-3 years (2-year lag: r = -0:375, p = 0:01; 3-year lag: r = -0:371, p = 0:03). Flood layer frequency in the Ammersee sediment record depicts... (More)

Solar influences on climate variability are one of the most controversially discussed topics in climate research. We analyze solar forcing of flood frequency in central Europe during spring and summer on interannual to multi-centennial timescales, integrating daily discharge data of the River Ammer (southern Germany) back to AD1926 (∼solar cycles 16-23) and the 5500-year flood layer record from varved sediments of the downstream Ammersee. Flood frequency in the River Ammer discharge record is significantly correlated to changes in solar activity when the flood record lags the solar signal by 2-3 years (2-year lag: r = -0:375, p = 0:01; 3-year lag: r = -0:371, p = 0:03). Flood layer frequency in the Ammersee sediment record depicts distinct multi-decadal variations and significant correlations to a total solar irradiance reconstruction (r = -0:4, p <0.0001) and 14C production rates (r = 0:37, p <0.0001), reflecting changes in solar activity. On all timescales, flood frequency is higher when solar activity is reduced. In addition, the configuration of atmospheric circulation associated with periods of increased River Ammer flood frequency broadly resembles that during intervals of reduced solar activity, as expected to be induced by the so-called solar top-down mechanism by model studies. Both atmospheric patterns are characterized by an increase in meridional airflow associated with enhanced atmospheric blocking over central Europe. Therefore, the significant correlations as well as similar atmospheric circulation patterns might provide empirical support for a solar influence on hydroclimate extremes in central Europe during spring and summer by the so-called solar top-down mechanism.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Climate of the Past
volume
12
issue
3
pages
7 pages
publisher
Copernicus Gesellschaft Mbh
external identifiers
  • Scopus:84964317525
ISSN
1814-9324
DOI
10.5194/cp-12-799-2016
language
English
LU publication?
yes
id
bfd17ca3-c684-4a8c-bddd-a2f19eea247f
date added to LUP
2016-10-04 07:41:08
date last changed
2016-10-04 07:41:08
@misc{bfd17ca3-c684-4a8c-bddd-a2f19eea247f,
  abstract     = {<p>Solar influences on climate variability are one of the most controversially discussed topics in climate research. We analyze solar forcing of flood frequency in central Europe during spring and summer on interannual to multi-centennial timescales, integrating daily discharge data of the River Ammer (southern Germany) back to AD1926 (∼solar cycles 16-23) and the 5500-year flood layer record from varved sediments of the downstream Ammersee. Flood frequency in the River Ammer discharge record is significantly correlated to changes in solar activity when the flood record lags the solar signal by 2-3 years (2-year lag: r = -0:375, p = 0:01; 3-year lag: r = -0:371, p = 0:03). Flood layer frequency in the Ammersee sediment record depicts distinct multi-decadal variations and significant correlations to a total solar irradiance reconstruction (r = -0:4, p &lt;0.0001) and 14C production rates (r = 0:37, p &lt;0.0001), reflecting changes in solar activity. On all timescales, flood frequency is higher when solar activity is reduced. In addition, the configuration of atmospheric circulation associated with periods of increased River Ammer flood frequency broadly resembles that during intervals of reduced solar activity, as expected to be induced by the so-called solar top-down mechanism by model studies. Both atmospheric patterns are characterized by an increase in meridional airflow associated with enhanced atmospheric blocking over central Europe. Therefore, the significant correlations as well as similar atmospheric circulation patterns might provide empirical support for a solar influence on hydroclimate extremes in central Europe during spring and summer by the so-called solar top-down mechanism.</p>},
  author       = {Czymzik, Markus and Muscheler, Raimund and Brauer, Achim},
  issn         = {1814-9324},
  language     = {eng},
  month        = {04},
  number       = {3},
  pages        = {799--805},
  publisher    = {ARRAY(0x79c5ee8)},
  series       = {Climate of the Past},
  title        = {Solar modulation of flood frequency in central Europe during spring and summer on interannual to multi-centennial timescales},
  url          = {http://dx.doi.org/10.5194/cp-12-799-2016},
  volume       = {12},
  year         = {2016},
}