CRC806-Database Publications Feed (Atom) http://crc806db.uni-koeln.de/ Statistical reconstruction of global vegetation for the last glacial maximum http://crc806db.uni-koeln.de/dataset/show/statistical-reconstruction-of-global-vegetation-for-the-last-glacial-maximum1534159355/ 2018-08-13T11:22:35+02:00 We provide an estimate of global vegetation density for the Last Glacial Maximum (LGM) using a simple statistic model. For today's climate, vegetation is divided into 11 vegetation types plus bare soil, for each of whichempirical relationship between the probability of its occurrence and climate controls is derived. The relationships are then used to reconstruct the glacial vegetation patterns with and without considering CO2 modifications. For the LGM, the climate drivers are estimated from an ensemble-average of global paleo-climate simulations. The reconstruction suggests that vegetation types existing in today's cooler and drier regimes prevailed during the LGM and today's desert areas had more vegetation then. The vegetation patterns of the Amazon and Sahara are examined in detail. In the Amazon, tropical rainforest cover is reduced from 80% in today's climate40% in the LGM climate. The Sahara was partly covered by shrubs and grassland, with bare ground fraction reduced from 80% today to 30% in the LGM. The reconstructed vegetation patterns are compared with available biome data. Patrick Ludwig Loess distribution and related Quaternary sediments in the Carpathian Basin http://crc806db.uni-koeln.de/dataset/show/loess-distribution-and-related-quaternary-sediments-in-the-carpathian-basin1534145183/ 2018-08-13T07:26:22+02:00 Janina Bösken Forschungen des Kölner Institutes für Ur- und Frühgeschichte zum späten Paläolithikum und Mesolithikum in Süddeutschland http://crc806db.uni-koeln.de/dataset/show/forschungen-des-klner-institutes-fr-ur-und-frhgeschichte-zum-spten-palolithikum-und-meso1531846371/ 2018-07-17T16:52:50+02:00 Birgit Gehlen Geostatistische und typochronologische Untersuchungen am mesolithischen Fundplatz Hambach 1 http://crc806db.uni-koeln.de/dataset/show/geostatistische-und-typochronologische-untersuchungen-am-mesolithischen-fundplatz-hambac1531845971/ 2018-07-17T16:46:10+02:00 Birgit Gehlen Potential and pitfalls of orbital tuning of loess sequences across Eurasia http://crc806db.uni-koeln.de/dataset/show/potential-and-pitfalls-of-orbital-tuning-of-loess-sequences-across-eurasia1531228952/ 2018-07-10T13:22:31+02:00 An understanding of the spatio-temporal evolution of Eurasian climate through the Quaternary requires comparable datasets as a very basic prerequisite. Here the standing inconsistency of time scales of Eurasian loess is initially outlined; numerous authors interpret soil formation phases in Eurasia in different ways, leading to different timing of related soil formations. Based on this issue, a personal view on the challenge of obtaining correlative age models with highlight on MIS 3 is given, and suggestions for a correlative age model based on northern hemisphere reference records are made. Ice models (as e.g. the Imbrie & Imbrie 1980 model) can explain several features seen in loess records, which deviate from most marine records and insolation. Using a combination of marine data and the Imbrie & Imbrie 1980 ice model, a proposal for the time scale of magnetic enhancement in loess-paleosol sequences is given. It needs to be noted that although such a correlation is useful for most records, but exceptions may exist especially for the timing of the S1 roughly related to MIS 5. Jonas Viehweger;Janina Bösken