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• W1567007274 abstract "<p>The best records of atmospheric change of glacial cycles are those from ice cores. However, ice cores cannot provide estimates of changes in atmospheric 13CO2 because of as of yet unresolved technical problems. One of the least understood and important influences on the changes to the isotopic composition of atmospheric CO2 are that of vascular plants. While marine benthic delta 13C records have been used to infer past changes in terrestrial vegetation, accurate estimation of changes in carbon storage on land during ice ages has proved elusive. Other estimates have been made from terrestrial biomes of pollen records but a large discrepancy between marine and land based estimates remains. This thesis offers a new method of deriving an ancient atmospheric delta 13CO2 record using measurements of phytolith-occluded carbon as a proxy. The method is designed to measure delta 13CO2 in ancient phytolith-occluded carbon and convert this signal into an atmospheric delta 13CO2 estimate for the atmosphere. Phytoliths are very small particles of silica (between 5 and 100 microns) that form distinctive and repeatable shapes in most plants. When phytoliths form within a plant, some of the host organic matter is trapped inside the phytolith. Phytoliths have been shown to contain occluded carbon and are present in most terrestrial sedimentary deposits. Moreover, because they survive well in most soils and sediments, the trapped carbon remains intact and preserved from contamination and alteration. Experiments were conducted to characterise and measure the natural variability of modern phytolith-occluded carbon. These included measurement of carbon isotopic fractionation effects between the atmosphere and whole plant material, measurement of carbon isotope fractionation between whole plant matter and phytolith-occluded carbon, and a determination of carbon compounds present in phytolith-occluded carbon. A formula was developed for separating the plant physiological factors from the atmospheric 13CO2 value in the phytolith-occluded carbon, thus providing a basis for estimating atmospheric 13CO2 values. Phytoliths were extracted and occluded carbon analysed from a 7.4m loess core. Changes in phytolith assemblages were used to create a direct record of changes to the local vegetation cover, and isotopic analyses of carbon in phytoliths to generate a record of atmospheric 13CO2 for the last 120,000 years. The record exhibits a number of periods when the atmosphere had very low delta 13CO2 values that correspond with CH4 peaks in the Vostok ice core. It is hypothesized here that these low values are a consequence of the release of large volumes of methane released from marine hydrate (clathrate) deposits into the atmosphere, thereby, diluting atmospheric 13CO2.</p>" @default.
• W1567007274 created "2016-06-24" @default.
• W1567007274 creator A5091524394 @default.
• W1567007274 date "2021-11-03" @default.
• W1567007274 modified "2023-10-07" @default.
• W1567007274 title "Ancient Climate and Environmental History From Phytolith-Occluded Carbon" @default.
• W1567007274 cites W1503696720 @default.
• W1567007274 cites W1510751004 @default.
• W1567007274 cites W1539600957 @default.
• W1567007274 cites W1552620553 @default.
• W1567007274 cites W1555522030 @default.
• W1567007274 cites W1556773719 @default.
• W1567007274 cites W1593103245 @default.
• W1567007274 cites W1594282911 @default.
• W1567007274 cites W1603330308 @default.
• W1567007274 cites W1632031305 @default.
• W1567007274 cites W1657772896 @default.
• W1567007274 cites W1677592024 @default.
• W1567007274 cites W1710313745 @default.
• W1567007274 cites W1888540468 @default.
• W1567007274 cites W1965323884 @default.
• W1567007274 cites W1968104183 @default.
• W1567007274 cites W1969097127 @default.
• W1567007274 cites W1971130199 @default.
• W1567007274 cites W1974198427 @default.
• W1567007274 cites W1975893121 @default.
• W1567007274 cites W1976024244 @default.
• W1567007274 cites W1976166930 @default.
• W1567007274 cites W1976733971 @default.
• W1567007274 cites W1977151751 @default.
• W1567007274 cites W1978306638 @default.
• W1567007274 cites W1978566953 @default.
• W1567007274 cites W1979277175 @default.
• W1567007274 cites W1980914380 @default.
• W1567007274 cites W1981457107 @default.
• W1567007274 cites W1982770936 @default.
• W1567007274 cites W1983587741 @default.
• W1567007274 cites W1984610159 @default.
• W1567007274 cites W1989370951 @default.
• W1567007274 cites W1989570428 @default.
• W1567007274 cites W2001076665 @default.
• W1567007274 cites W2001677731 @default.
• W1567007274 cites W2002256637 @default.
• W1567007274 cites W2003359633 @default.
• W1567007274 cites W2007757256 @default.
• W1567007274 cites W2010421934 @default.
• W1567007274 cites W2011299446 @default.
• W1567007274 cites W2012148151 @default.
• W1567007274 cites W2014371700 @default.
• W1567007274 cites W2017192340 @default.
• W1567007274 cites W2017996711 @default.
• W1567007274 cites W2018100788 @default.
• W1567007274 cites W2019472517 @default.
• W1567007274 cites W2022857481 @default.
• W1567007274 cites W2023019688 @default.
• W1567007274 cites W2025771104 @default.
• W1567007274 cites W2026319015 @default.
• W1567007274 cites W2027415826 @default.
• W1567007274 cites W2027987499 @default.
• W1567007274 cites W2036248232 @default.
• W1567007274 cites W2037454430 @default.
• W1567007274 cites W2038442416 @default.
• W1567007274 cites W2040345304 @default.
• W1567007274 cites W2041299428 @default.
• W1567007274 cites W2042950888 @default.
• W1567007274 cites W2043041018 @default.
• W1567007274 cites W2045780987 @default.
• W1567007274 cites W2047443614 @default.
• W1567007274 cites W2050628073 @default.
• W1567007274 cites W2052736701 @default.
• W1567007274 cites W2053896224 @default.
• W1567007274 cites W2054253706 @default.
• W1567007274 cites W2055497137 @default.
• W1567007274 cites W2058199405 @default.
• W1567007274 cites W2059332307 @default.
• W1567007274 cites W2061187792 @default.
• W1567007274 cites W2062640094 @default.
• W1567007274 cites W2063079532 @default.
• W1567007274 cites W2063192408 @default.
• W1567007274 cites W2063966923 @default.
• W1567007274 cites W2063987912 @default.
• W1567007274 cites W2064869848 @default.
• W1567007274 cites W2065522500 @default.
• W1567007274 cites W2065680013 @default.
• W1567007274 cites W2068589879 @default.
• W1567007274 cites W2070608792 @default.
• W1567007274 cites W2074457615 @default.
• W1567007274 cites W2074566383 @default.
• W1567007274 cites W2075343652 @default.
• W1567007274 cites W2075565070 @default.
• W1567007274 cites W2077165515 @default.
• W1567007274 cites W2077976699 @default.
• W1567007274 cites W2079124451 @default.
• W1567007274 cites W2079841802 @default.
• W1567007274 cites W2080523684 @default.
• W1567007274 cites W2081784155 @default.
• W1567007274 cites W2082263592 @default.
• W1567007274 cites W2083904754 @default.
• W1567007274 cites W2085057784 @default.
• W1567007274 cites W2086361936 @default.

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