نتایج جستجو برای: upper holocene warm period
تعداد نتایج: 713284 فیلتر نتایج به سال:
Abstract This study demonstrates the feasibility of speleothem magnetism as a paleo-hydrology proxy in speleothems growing semi-arid conditions. Soil-derived magnetic particles retain valuable information on physicochemical conditions overlying soil, and changes bedrock hydrology. Yet, link between isotopic proxies has been only partly established. We reveal strong coupling inflow (quantified u...
As the planet cooled from peak warmth in the early Cenozoic, extensive Northern Hemisphere ice sheets developed by 2.6 Ma ago, leading to changes in the circulation of both the atmosphere and oceans. From w2.6 to w1.0 Ma ago, ice sheets came and went about every 41 ka, in pace with cycles in the tilt of Earth’s axis, but for the past 700 ka, glacial cycles have been longer, lasting w100 ka, sep...
Abstract Holocene sediments at Emerald Lake in central Utah (3090 m asl) document the paleohydroclimatic history of western Upper Colorado River headwater region. Multi-proxy analyses sediment composition, mineralogy, and stable isotopes carbonate (δ 18 O δ 13 C) show changes effective moisture for past ca. 10,000 years millennial to decadal timescales. originated as a shallow, closed-basin cir...
The species compositions and structures of faunas different Late Pleistocene Holocene periods from the local natural area northeast Perm Pre-Urals (Specially Protected Nature Area (SPNA) «Mahnevskie Caves») were reseached. Zoogenic deposits Makhnevskaya ledyanaya cave Mahnevskaya-2 Bolshaya Mahnevskaya formed during relatively «warm» Mikulinsky interglacial, Bryansk megastadial Subboreal. 61 ta...
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