Mark H. Thiemens
He moved to the University of Chicago at the Enrico Fermi Institute for Nuclear Studies (1977-1980) where he worked with Robert N. Clayton using lunar samples to track solar wind origin and evolution, meteorite cosmochemistry, and early atmospheric chemistry.
Thiemens moved to the department of chemistry at the University of California San Diego in 1980, where he was hired as an assistant professor as a replacement for Hans Seuss and took over the laboratory of Nobel Laureate Harold Urey.
[15] The underlying assumption for the inclusions anomaly deriving from a nucleosynthetic component was incorrect and new models for early Solar System formation were needed and have evolved since.
The understanding of the basis of the ozone effect has been extensively studied by Nobel Laureate Rudy Marcus and catalyzed deeper insight into the chemical physics.
[30] Mass independent sulfur isotopes in Mars meteorites were used to show ultra violet SO2 photochemical reactions in the past Martian atmosphere.
Present day sulfur isotopic anomalies in sulfate from Antarctic and Greenland ice have been used to determine the influence of massive volcanoes on the stratosphere.
[35] Samples from a snow pit dug by Thiemens and colleagues have shown that there exist sources of sulfur chemistry that need to be included in studies of the atmosphere today and in the early Earth.
[36] The inclusion of radiogenic 35S with the 4 stable sulfur isotopes have further enhanced mechanistic details of the contributors to the fractionation processes in the pre Cambrium era and today.
The small effect in the O2 is removed by the process of photosynthesis and respiration[41] and allows a new, highly sensitive way to quantify global primary productivity (GPP) in the world's oceans and, from oxygen trapped in ice cores across long time periods.
Thiemens developed the ability to measure naturally produced 35S (87-day half-life) to provide the first trans Pacific atmospheric Fukushima emissions and calculate the reactor neutronicity.
