Climate, paleohydrology and land use change in the Central Iberian Range over the last 1.6 ka: The La Parra Lake record

نویسندگان

  • Fernando Barreiro-Lostres
  • Ana Moreno
  • Santiago Giralt
  • Margarita Caballero
  • Blas Valero-Garcés
چکیده

A multiproxy study of a 7 m long sedimentary sequence from Lake La Parra (39o 50.948’, 1o 52’, 1014 m a.s.l) supported by 11 C AMS and Pb/Cs dates provides a robust, high-resolution hydrological and environmental variability record for the last 1600 years of the Las Torcas sinkhole Complex in the Central Iberian Range. The succession of depositional environments in Lake La Parra sinkhole is controlled by both changes in the regional water table and by the balance between sedimentary input through ephemeral creeks and in-lake production of carbonates and organic matter. Although synergetic links with climate are likely, phases of increased sediment delivery to the lake at ca 500–700 AD, ca 1000 AD, 1450-1500 AD, 1550-650 AD and since 1700 till recent times are driven primarily by human impact in the watershed. Prior to ca 300 AD the sinkhole was dry, then became a lake at the end of the Roman Period (350 AD) when the doline was flooded, and it has not dried out during the last 1600 years. Moderate lake levels with deposition of coarser clastic facies dominated up to the 12 th century (400-1200 AD), and relatively higher levels with deposition of laminated facies during the 13 -15 centuries (1200-1600 AD). The pattern of paleohydrological evolution at a centennial scale is roughly coherent with most Iberian lacustrine records, however, the ‘La Parra’ sequence indicates that increased humidity during Iberian-Roman times was restricted to southern Spain, and the humid phases of the LIA starting and ending earlier in the central Iberian Range compared to the Pyrenean Domain and southern Spain. This new sequence highlights the heterogeneity through space and time of the main dry and wet climatic periods at shorter scales, emphasizing the impact of latitudinal climate gradients on the Iberian Peninsula climate

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تاریخ انتشار 2014