Detecting climatic signals in an anthropogenically disturbed catchment: The late-Holocene record from the Petit Lac d’Annecy, French Alps
Richard T. Jones|Liam Reinhardt|John A. Dearing|Darren Crook|Richard Chiverrell|Katharine Welsh|Elisabeth Vergès
Historical and documentary records from the Petit Lac d’Annecy, indicate that human activities have been dominant ‘geomorphic process’ shaping catchment during late Holocene, with deforestation, agriculture artificial drainage profoundly affecting both pace spatial distribution of soil erosion. The impact past climatic change on evolution is less certain because lack long-term climate for site. Previous attempts to use sediment record lake investigate role may played were hampered by difficulty in isolating disentangling signal preserved within archive, overprinting activity. This a common problem regions long history activity landscape. In this study we range novel statistical techniques (including cross-correlation cross spectral analysis) assess relative importance driving landscape dynamics. analysis carried out an updated high-resolution palaeo-environmental data set d’Annecy. results regional phenomena such as Atlantic multidecadal oscillation are partly responsible dynamics at d’Annecy throughout Holocene. We find typically requires decades, or longer, respond changes precipitation, reflecting stochastic nature river storage transport. 4 yr integrated core effectively attenuates ‘signal shredding’ effect shorter-term internally generated transport processes. Nonetheless, climatically induced geormorphic process–responses weak compared pervasive activities.
The Holocene|HAL (Le Centre pour la Communication Scientifique Directe)|HAL (Le Centre pour la Communication Scientifique Directe)|Open Research Exeter (University of Exeter)