Carbon-14 Activity during the Past 5,000 Years
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چکیده
منابع مشابه
Climatic and cultural changes in the west Congo Basin forests over the past 5000 years
Central Africa includes the world's second largest rainforest block. The ecology of the region remains poorly understood, as does its vegetation and archaeological history. However, over the past 20 years, multidisciplinary scientific programmes have enhanced knowledge of old human presence and palaeoenvironments in the forestry block of Central Africa. This first regional synthesis documents s...
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A series of 14C measurements in Ocean Drilling Program cores from the tropical Cariaco Basin, which have been correlated to the annual-layer counted chronology for the Greenland Ice Sheet Project 2 (GISP2) ice core, provides a high-resolution calibration of the radiocarbon time scale back to 50,000 years before the present. Independent radiometric dating of events correlated to GISP2 suggests t...
متن کاملActivity and Global Carbon Cycle Changes over the Past 50,000 Years
27. L. Redmond, S.-R. Oh, C. Hicks, G. Weinmaster, A. Ghosh, Nature Neurosci. 3, 30 (2000). 28. To create the CREST antibody, We used PCR to amplify full-length crest cDNA from P0 mouse brain total RNA and cloned it into pET21 vector for expression of His-tagged CREST protein in bacteria. After isopropyl-D-thiogalactopyranoside induction, CREST protein was mainly collected in the inclusion body...
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It is generally accepted that progressive cooling of global climate since the Late Cretaceous results from decreasing partial pressure of atmospheric CO2 (pCO2). However, details on how and why the carbon cycle evolved and how it would affect pCO2 have not been fully resolved. While the long-term decline of pCO2 might be caused by the decrease of volcanic degassing through the negative feedback...
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A 81BO record from Dunde Ice Cap, located in the Qjlian mountains on the northeastern margin of the Tibetan Plateau, has been analyzed and interpreted. With an ice temperature of 7.3°C at a depth of 10 m and -4.7°C at the bottom of the ice cap, and an accumulation rate of400mma· l , the Dunde core has provided interesting results. The upper part of this core, core D-I, can be easily dated by a ...
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ژورنال
عنوان ژورنال: Nature
سال: 1958
ISSN: 0028-0836,1476-4687
DOI: 10.1038/1821433a0