نتایج جستجو برای: sulfur isotopes
تعداد نتایج: 56644 فیلتر نتایج به سال:
Many aspects of Earth's early sulfur cycle, from the origin of mass-anomalous fractionations to the degree of biological participation, remain poorly understood--in part due to complications from postdepositional diagenetic and metamorphic processes. Using a combination of scanning high-resolution magnetic superconducting quantum interference device (SQUID) microscopy and secondary ion mass spe...
Significance Assessment for large-scale photosynthesis-climate feedbacks is needed. Carbonyl sulfide (COS) an emerging proxy the terrestrial photosynthesis. This limited by uncertainties related to magnitudes of COS sources and sinks. Here, we demonstrate measurement-based assessments isotopic signal of: tropospheric COS, marine anthropogenic emissions, fractionation plant uptake. All these res...
Particulate pollution from anthropogenic and natural sources is a severe problem in China. Sulfur and oxygen isotopes of aerosol sulfate (δ(34)Ssulfate and δ(18)Osulfate) and water-soluble ions in aerosols collected from 2012 to 2014 in Beijing are being utilized to identify their sources and assess seasonal trends. The mean δ(34)S value of aerosol sulfate is similar to that of coal from North ...
In the low-oxygen Archean world (>2400 million years ago), seawater sulfate concentrations were much lower than today, yet open questions frustrate the translation of modern measurements of sulfur isotope fractionations into estimates of Archean seawater sulfate concentrations. In the water column of Lake Matano, Indonesia, a low-sulfate analog for the Archean ocean, we find large (>20 per mil)...
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