Moreover, a detailed correlation has been established between sandy levels in the sedimentary record of MGL and Charquini mountain glacier moraines. The chronology point out that the detected climate change clearly occurs during the Last Ice Age (LIA). Complementary, a 210Pb datation over the superficial core levels was used to establish a sedimention rate and estimate a chronology for no dated levels.
THE SYNDICATE LAKE ELSINORE FULL
A full description and analysis of physical and chemical parameters, sedimentology, mineralogy and geochemical proxys allow to conclude that sediment record shows an important climate change (CC). The sediment record was studied with a lake core. MGL is the biggest lake of the valley, and it is at the end of Milluni Valley, a strategic position that allow a complete sedimentary record of last 450 years. The Milluni area presents a classic U shaped valley, product of the last glacial regression. Milluni Grande Lake (MGL) is located Milluni Valley, west-side of Eastern Andes, Bolivia. Sedimentary and geochemical evidences of the little Ice Age in the Milluni Grande Lake of the Bolivia high-platean. The conspicuous absence of the ~27.5-~25.5 ka glacial "mega-drought" in the Santa Barbara Basin pollen record highlights the sensitivity of Lake Elsinore to hydroclimate change, and thus, the importance of this new record that indicates that mega-drought can occur during the full glacial when climatic boundary conditions and forcings differed substantially from the present. Pollen-based reconstructions of temperature and precipitation at Lake Elsinore are generally correlative with pollen-based paleoclimatic reconstructions and foraminifera-based sea surface temperatures from Santa Barbara Basin in marine core ODP 893. Subsequent gradual expansion of xeric vegetation post - Younger Dryas denotes the establishment of a winter hydroclimate regime in coastal southern California that is more similar to modern conditions. A brief reversal at ~13.1-~12.1 ka, as reflected by an expansion of Pinus, is correlative with the Younger Dryas and interrupts development of warm, postglacial climate. Postglacial development of Quercus woodland and chaparral mark the return to more xeric, warmer conditions at this time.
The subsequent, contrasting monotonic occurrence of montane conifers reflects little variation in cold, mesic climate until ~15 ka. This prolonged and extended dry interval, which corresponds with warm waters offshore, imply strengthening of the North Pacific High and persistent below-average winter precipitation. In the Lake Elsinore watershed, the initial, mesic montane conifer forests dominated by Pinus, and Cupressaceae with trace amounts of Abies and Picea were replaced by a sequence of multiple, extended severe mega-droughts between ~27.5 and ~25.5 ka, in which halophytic and xerophytic herbs and shrubs occupied an ephemeral lake. High resolution pollen analyses of sediment core LEDC10-1 from Lake Elsinore yield the first well-dated, terrestrial record of sub-centennial-scale ecologic change in coastal southern California between ~32 and 9 ka.