Registro de sequías históricas en el occidente de México con base en el análisis elemental de sedimentos lacustres: El caso del lago de Santa María del Oro

Hydrochemistry, ostracods and diatoms in a deep, tropical, crater lake in Western Mexico

“…The ionic composition and its slightly high salinity (mesohalobus) suggest that the lake has undergone evaporative concentration in the past. Total inorganic carbon contents and XRD analysis in sediment traps indicate that aragonite precipitates when the lake is stratified, during the wet season, which includes the hottest months of the year, producing the thin carbonate layers that are characteristic of the sediments of this lake (Sosa-Nájera et al, 2010). Carbonate precipitation favours [Ca 2+ ] depletion and [Cl -] enrichment of the lake waters, a condition not easily found in continental waters with salinities under 1 g L -1 as in SMO.…”

“…Carbonate precipitation during the hot season might also be favoured by algal blooms, mainly cyanobacteria, which were observed during field work. Aragonite forms thin white laminae that were observed in the sediment trap and which are characteristic of the laminated sediments of this lake (Sosa-Nájera et al, 2010). Even though salinity and evaporation are not necessarily linearly related during solute evolution (Ito and Forester, 2008) Eugster and Hardie, 1978).…”

Climatic variability and human impact during the last 2000 years in western Mesoamerica: evidence of late Classic (AD 600–900) and Little Ice Age drought events

“…sediments is also indicative of surface run-off to the lake and erosion (Metcalfe et al, 2010;Sosa-Nájera et al, 2010). Both variables can therefore be used to identify times of higher or lower precipitation and surface transport of sediments to the lake.…”

The Holocene history of the North American Monsoon: ‘known knowns’ and ‘known unknowns’ in understanding its spatial and temporal complexity

“…There has been an increasing focus on high resolution records of the last millennium (e.g. Lozano-Garcia et al, 2007;Kienel et al, 2009;Sosa-Najera et al, 2010;Cuna et al, 2013) providing insights into climatic variability during the Medieval Climate Anomaly (MCA) and the Little Ice Age (LIA) (see below).…”