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Closed Access item Chrysophyte cysts from lake sediments reveal the submillennial winter/spring climate variability in the northwestern Mediterranean region throughout the Holocene.
|Citation:||Climate Dynamics 24 : 263-278 (2005)|
|Abstract:||In the last decade, much effort was dedicated
to the reconstruction of past climate at high temporal
resolution. Here, we show the suitability of chrysophyte
cysts from lake sediments for revealing continental
climate variability when used in sensitive sites, such as
those in high mountains. We demonstrate that altitude
is a main factor influencing the present distribution of
chrysophytes and develop a transfer function to evaluate
the local ‘‘altitude anomaly’’ on a lake site
throughout time. Based on our knowledge of chrysophyte
ecology, the altitude anomalies are interpreted as
winter/spring climate signatures. The method was applied
to a Holocene record from a lake in the Pyrenees
showing submillennial climatic variability in this
northwestern Mediterranean zone. A warming trend
was present from the early Holocene to 4 kyear BP.
Comparison with pollen-based reconstructions of
summer temperatures denoted a contrasting decrease in
continentality between the two parts of the Holocene.
Oscillations of 1 cycle per ca. 2,000 years appeared
throughout the record. The warmest Holocene winters
were recorded during the Medieval Warm Period at ca.
AD 900 and 450 and the Roman Warm Period (2.7–
2.4 kyear BP). Winters in the period AD 1,050–1,175
were inferred to be as cold as in the Little Ice Age. The
period between 3 and 7 kyear BP showed lower intensity
in the fluctuations than in early and late Holocene. The
cold event, 8,200 years ago, appeared embedded in a
warm fluctuation. Another cold fluctuation was
recorded around 9 kyear BP, which is in agreement with
Irish and Greenland records.|
|Description:||16 páginas, 13 figuras, 3 tablas.|
|Publisher version (URL):||http://dx.doi.org/10.1007/s00382-004-0482-1|
|E-ISSNmetadata.dc.identifier.doi = DOI:||1432-0894|
|Appears in Collections:||(CEAB) Artículos|
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