Historical climatic oscillations

This work aims to study recent climatic oscillations and their influence on sedimentation in the Ria de Vigo, a coastal embayment in Galicia, NW Spain. It is based on the study of clay mineral assemblages, in conjunction with other proxies (granulometric, geochemical, geochronological and microfaunal), in the core KSGX 24. A Benthic Foraminifera High Productivity (BFHP) proxy was used to determine changes in the flux of organic matter (OM) at the bottom of the study area.

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Historical analyses also reveal wide- spread disasters, social disruption and disease outbreaks in response to the more acute, inter-annual, quasi-periodic ENSO (El Niño Southern Oscillation) cycle (1). The depletion of soil fertility and freshwater supplies, and the mismanage- ment of water catchment basins via excessive deforestation, also have con- tributed to the decline of various regional populations over the millennia (2). Today, climate scientists predict that humankind’s increasing emission of greenhouse gases will induce a long-term change in the world’s climate.

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