Citation:

2009WR008360

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Abstract:

A 450 year spring-summer flood layer time series at seasonal resolution has been established from the varved sediment record of Lake Ammersee (southern Germany), applying a novel methodological approach. The main results are (1) the attainment of a precise chronology by microscopic varve counting, (2) the identification of detrital layers representing flood-triggered fluxes of catchment material into the lake, and (3) the recognition of the seasonality of these flood layers from their microstratigraphic position within a varve. Tracing flood layers in a proximal and a distal core and correlating them by application of the precise chronology provided information on the depositional processes. Comparing the seasonal flood layer record with daily runoff data of the inflowing River Ammer for the period from 1926 to 1999 allowed the definition of an approximate threshold in flood magnitude above which the formation of flood layers becomes very likely. Moreover, it was possible for the first time to estimate the "completeness" of the flood layer time series and to recognize that mainly floods in spring and summer, representing the main flood seasons in this region, are well preserved in the sediment archive. Their frequency distribution over the entire 450 year time series is not stationary but reveals maxima for colder periods of the Little Ice Age when solar activity was reduced. The observed spring-summer flood layer frequency further shows trends similar to those of the occurrence of flood-prone weather regimes since A.D. 1881, probably suggesting a causal link between solar variability and changes in midlatitude atmospheric circulation patterns.

Coverage:

Latitude: 47.997700 * Longitude: 11.011560

Minimum Elevation: -81.0 m * Maximum Elevation: 533.0 m

Event(s):

AS_07-P1 * Latitude: 47.997700 * Longitude: 11.011560 * Elevation Start: -81.0 m * Elevation End: 533.0 m * Recovery: 1.33 m * Location: Ammersee, Bavaria, Germany * Method/Device: Piston corer, UWITEC (PCUWI) * Comment: Modified UWITEC short-core system

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	AGE	Age	ka BP		Geocode
2	Age	Age	a AD/CE	Czymzik, Markus	Varve year
3	Flood layer	Flood lay		Czymzik, Markus	Spring
4	Flood layer	Flood lay		Czymzik, Markus	Summer
5	Flood layer	Flood lay		Czymzik, Markus	Fall
6	Flood layer	Flood lay		Czymzik, Markus	Winter
7	Flood layer	Flood lay		Czymzik, Markus	not classifiable
8	Flood layer	Flood lay		Czymzik, Markus	Annual

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

3185 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Age [ka BP]	2 Age [a AD/CE] (Varve year)	3 Flood lay (Spring)	4 Flood lay (Summer)	5 Flood lay (Fall)	6 Flood lay (Winter)	7 Flood lay (not classifiable)	8 Flood lay (Annual)
-0.049	1999	0	1	0	0	0	1
-0.048	1998	0	0	0	0	0	0
-0.047	1997	0	0	0	0	0	0
-0.046	1996	0	0	0	0	0	0
-0.045	1995	0	0	0	0	0	0
-0.044	1994	0	0	0	0	0	0
-0.043	1993	0	1	0	0	0	1
-0.042	1992	0	0	0	0	0	0
-0.041	1991	0	0	0	0	0	0
-0.040	1990	1	0	0	0	0	1
-0.039	1989	0	0	0	0	0	0
-0.038	1988	0	0	0	0	0	0
-0.037	1987	0	0	0	0	0	0
-0.036	1986	0	0	0	0	0	0
-0.035	1985	0	0	0	0	0	0
-0.034	1984	0	0	0	0	0	0
-0.033	1983	0	0	0	0	0	0
-0.032	1982	0	0	0	0	0	0
-0.031	1981	0	1	0	0	0	1
-0.030	1980	0	0	0	0	0	0
-0.029	1979	1	0	0	0	0	1
-0.028	1978	0	0	0	0	0	0
-0.027	1977	0	0	0	0	0	0
-0.026	1976	0	1	0	0	0	1
-0.025	1975	0	0	0	0	0	0
-0.024	1974	0	0	0	0	0	0
-0.023	1973	0	0	0	0	0	0
-0.022	1972	0	0	1	0	0	1
-0.021	1971	0	0	0	0	0	0
-0.020	1970	0	0	0	0	0	0
-0.019	1969	0	0	0	0	0	0
-0.018	1968	0	0	1	0	0	1
-0.017	1967	0	0	0	0	0	0
-0.016	1966	0	0	0	0	0	0
-0.015	1965	0	1	0	0	0	1
-0.014	1964	0	0	0	0	0	0
-0.013	1963	0	0	0	0	0	0
-0.012	1962	0	0	0	0	0	0
-0.011	1961	0	0	0	0	0	0
-0.010	1960	0	0	0	0	0	0
-0.009	1959	0	0	0	0	0	0
-0.008	1958	0	0	0	0	0	0
-0.007	1957	0	0	0	0	0	0
-0.006	1956	0	0	0	0	0	0
-0.005	1955	0	0	0	0	0	0
-0.004	1954	0	1	0	0	0	1
-0.003	1953	0	0	0	0	0	0
-0.002	1952	0	0	0	1	0	1
-0.001	1951	0	0	0	0	0	0
0.000	1950	0	0	0	0	0	0
0.001	1949	0	1	0	0	0	1
0.002	1948	0	0	0	0	0	0
0.003	1947	0	0	1	0	0	1
0.004	1946	0	1	0	0	0	1
0.005	1945	0	0	0	0	0	0
0.006	1944	0	0	0	0	0	0
0.007	1943	0	0	0	0	0	0
0.008	1942	0	0	0	0	0	0
0.009	1941	0	0	0	0	0	0
0.010	1940	0	0	0	0	0	0
0.011	1939	0	0	0	0	0	0
0.012	1938	0	0	1	0	0	1
0.013	1937	0	0	0	0	0	0
0.014	1936	0	0	0	0	0	0
0.015	1935	0	0	0	0	0	0
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0.017	1933	0	0	0	0	0	0
0.018	1932	0	1	0	0	0	1
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0.020	1930	0	1	0	0	0	1
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