title: Solar Output Controls Periodicity in Lake Productivity and Wetness at Southernmost South America.
abstract: Cyclic changes in total solar irradiance (TSI) during the Holocene are known to affect global climatic conditions and cause cyclic climatic oscillations, e.g., Bond events and related changes of environmental conditions. However, the processes how changes in TSI affect climate and environment of the Southern Hemisphere, especially in southernmost South America, a key area for the global climate, are still poorly resolved. Here we show that highly sensitive proxies for aquatic productivity derived from sediments of a lake near the Chilean South Atlantic coast (53 °S) strongly match the cyclic changes in TSI throughout the Holocene. Intra-lake productivity variations show a periodicity of ~200-240 years coherent with the time series of TSI-controlled cosmogenic nuclide10Be production. In addition TSI dependent periodicity of Bond events (~1500 years) appear to control wetness at the LH site indicated by mineral matter erosion from the catchment to the lake assumingly through shifts of the position of the southern westerly wind belt. Thus, both intra-lake productivity and wetness at the southernmost South America are directly or indirectly controlled by TSI.
authors.affiliation: Departamento de Edafoloxía e Química Agrícola. Facultade de Bioloxía. Campus Vida. Universidade de Santiago, Santiago de Compostela, Spain.|Institut für Geoökologie, AG Umweltgeochemie, Technische Universität Braunschweig, 38106 Braunschweig, Germany.
authors.forename: Marta
authors.initials: M
authors.lastname: Pérez-Rodríguez
authors.affiliation: Lehrstuhl für Hydrologie, Universität Bayreuth, Universitätsstr. 30, 95440 Bayreuth, Germany.
authors.forename: Benjamin-Silas
authors.initials: BS
authors.lastname: Gilfedder
authors.affiliation: Institut für Geoökologie, AG Umweltgeochemie, Technische Universität Braunschweig, 38106 Braunschweig, Germany.
authors.forename: Yvonne-Marie
authors.initials: YM
authors.lastname: Hermanns
authors.affiliation: Institut für Geoökologie, AG Umweltgeochemie, Technische Universität Braunschweig, 38106 Braunschweig, Germany.
authors.forename: Harald
authors.initials: H
authors.lastname: Biester