نتایج جستجو برای: late holocene

تعداد نتایج: 201114  

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2011
Erik Trinkaus

The establishment of modern humans in the Late Pleistocene, subsequent to their emergence in eastern Africa, is likely to have involved substantial population increases, during their initial dispersal across southern Asia and their subsequent expansions throughout Africa and into more northern Eurasia. An assessment of younger (20-40 y) versus older (>40 y) adult mortality distributions for lat...

2014
Navnith K. P. Kumaran Damodaran Padmalal Madhavan K. Nair Ruta B. Limaye Jaswant S. Guleria Rashmi Srivastava Anumeha Shukla

The high rainfall and low sea level during Early Holocene had a significant impact on the development and sustenance of dense forest and swamp-marsh cover along the southwest coast of India. This heavy rainfall flooded the coastal plains, forest flourishing in the abandoned river channels and other low-lying areas in midland.The coastline and other areas in lowland of southwestern India supply ...

2006
Hagai Ron Norbert R. Nowaczyk Ute Frank Michael O. McWilliams

We have studied the magnetic properties of wet and dry late Pleistocene Lake Lisan sediments and the Holocene Dead Sea sediments. Our initial prediction was that the properties of both would be quite similar, because they have similar source and lake conditions, unless diagenetic change had occurred. Rock magnetic and paleomagnetic experiments revealed three stages of magnetization acquisition....

2004
Matthew E. Kirby Christopher J. Poulsen Steve P. Lund William P. Patterson Liam Reidy Douglas E. Hammond

Southern California faces an imminent freshwater shortage. To better assess the future impact of this water crisis, it is essential that we develop continental archives of past hydrological variability. Using four sediment cores from Lake Elsinore in Southern California, we reconstruct late Holocene ( 3800 calendar years B.P.) hydrological change using a twentieth-century calibrated, proxy meth...

Journal: :Quaternary 2023

An 8500-year record of high-resolution pollen, non-pollen palynomorph, microscopic charcoal and selected geochemical data (Ti, Zr Pb) is presented from an ombrotrophic mire the Xistral Mountains, Galicia, North-West Iberia. The results suggest that vegetation changes over last eight millennia are primarily result human disturbance, fire climate change. Climate were main factors influencing deve...

2006
Michael Staubwasser Harvey Weiss

The precipitation climatology and the underlying climate mechanisms of the eastern Mediterranean, West Asia, and the Indian subcontinent are reviewed, with emphasis on upper and middle tropospheric flow in the subtropics and its steering of precipitation. Holocene climate change of the region is summarized from proxy records. The Indian monsoon weakened during the Holocene over its northernmost...

2016
Ulrike Herzschuh Janett Borkowski Jacob Schewe Steffen Mischke Fang Tian

32 (Paleo-)climatologists are challenged to identify mechanisms that cause the 33 observed abrupt Holocene monsoon events despite the fact that monsoonal 34 circulation is assumed to be driven by gradual insolation changes. Here we provide 35 proxy and model evidence to show that moisture-advection feedback can lead to a 36 non-linear relationship between sea-surface and continental temperature...

Journal: :Quaternary Science Reviews 2021

Lowland multiple-channel rivers are characterised by floodplain-corridor heterogeneity, high ecological and heritage value, can be in quasi-stable states. This holistic study of a surviving temperate zone example (Culm, UK) uses geomorphological mapping, 14C, direct sediment dating (OSL, fallout radionuclides), palaeoecology. reveals the evolution channel-floodplain system from an initial braid...

2004
Steven G. Driese Gail M. Ashley Zheng-Hua Li Victoria C. Hover R. Bernhart Owen

Wetland and floodplain soils in the East African Rift of Kenya provide a record of changing palaeoclimate and palaeohydrology compatible with climate records for the mid-Holocene through the late Holocene Medieval Warm Period (~AD 800–1270) and Little Ice Age (~AD 1270–1850), documented previously in nearby lacustrine sites. Soils forming from volcaniclastic source materials in both Loboi Swamp...

Journal: :Philosophical transactions of the Royal Society of London. Series B, Biological sciences 2011
Samuel T Turvey Susanne A Fritz

Although the recent historical period is usually treated as a temporal base-line for understanding patterns of mammal extinction, mammalian biodiversity loss has also taken place throughout the Late Quaternary. We explore the spatial, taxonomic and phylogenetic patterns of 241 mammal species extinctions known to have occurred during the Holocene up to the present day. To assess whether our unde...

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