نتایج جستجو برای: upper holocene warm period
تعداد نتایج: 713284 فیلتر نتایج به سال:
Abstract Proxy-based studies have linked the pre-industrial atmospheric $$p_{{\rm{CO}}_{2}}$$ p CO 2 rise of ∼20 ppmv in mid- to late Holocene an inferred increase Southern Ocean overturning and associated biogeochemical changes. ...
Feline coprolites were examined for parasites with the aim of studying ancient infections that occurred in the Patagonian region during the Holocene period. Eggs compatible to Trichuris sp., Calodium sp., Eucoleus sp., Nematodirus sp., Oesophagostomum sp. (Nematoda), Monoecocestus sp. (Cestoda) and Eimeria macusaniensis (Coccidia) were recovered from faecal samples. The results obtained from th...
Multi-proxy high-resolution records relating to climate and dominant vegetation cover have been obtained from a peat deposit retrieved the Kapsabet swamp in western Kenya. The 4-m long sequence provided continuous sedimentation record spanning ca. 3023 cal yr BP present is representative of late Holocene changes relatively high-altitude part Lake Victoria catchment. Paleoenvironmental factors i...
The Greenland ice core from NorthGRIP (NGRIP) contains a proxy climate record across the Pleistocene–Holocene boundary of unprecedented clarity and resolution. Analysis of an array of physical and chemical parameters within the ice enables the base of the Holocene, as reflected in the first signs of climatic warming at the end of the Younger Dryas/Greenland Stadial 1 cold phase, to be locatedwi...
Spatio-temporal variations of factors affecting the occurrence of precipitation can lead to a change in its amount. The atmospheric moisture is one of the most important factors for precipitation formation. In this study, changes in atmospheric moisture and its relation with occurrence of seasonal wet and dry periods were investigated in Iran. The re-analysis data from the ERA interim European ...
Major ice loss in the Amundsen Sea sector of West Antarctic Ice Sheet (WAIS) is hypothesized to have triggered sheet collapses during past warm periods such as those Pliocene. International Ocean Discovery Program (IODP) Expedition 379 recovered continuous late Miocene Holocene sediments from a sediment drift on continental rise, allowing assessment sedimentation processes response climate cycl...
Abstract The cryospheric response to climatic warming responsible for recent Arctic sea ice decline can be elucidated using marine geological archives which offer an important long-term perspective. Holocene Thermal Maximum, between 10 and 6 thousand years ago, provides opportunity investigate during a warmer-than-present interval. Here we use organic biomarkers benthic foraminiferal stable iso...
Proxy and model-based studies suggest multi-scale temporal variability in the Indian summer monsoon (ISM). In this study, using CESM1 atmospheric general circulation model, we carried out multiple ensemble AGCM simulations for Mid-Holocene (MH; ? 6 kyr BP), Medieval Warm Period (MWP; 1 Little Ice Age (LIA; 0.35 Historical (HS; CE 2000) periods. We used PMIP3/CMIP5 boundary conditions purpose. O...
A 100 cm long sediment sequence was recovered from Beaver Lake in Amery Oasis, East Antarctica, using gravity and piston corers. Sedimentological and mineralogical analyses and the absence of micro and macrofossils indicate that the sediments at the base of the sequence formed under glacial conditions, probably prior to c. 12 500 cal. yr BP. The sediments between c. 81 and 31 cm depth probably ...
Holocene records of fire, vegetation, and climate were reconstructed from four sites in the Bitterroot Range region of the Northern Rocky Mountains in order to examine the vegetation and fire histories and evaluate the hypothesis proposed by Whitlock and Bartlein (1993) regarding the effects of increased summer insolation on precipitation patterns. Vegetation history in the series of sites was ...
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