Publications by authors named "Mojhgan A Haghnegahdar"
Tracing sources of atmospheric methane using clumped isotopes.
Proc Natl Acad Sci U S A
November 2023
Article Synopsis
- The study utilizes a new measurement technique to analyze different isotopic variants of methane (CH) to understand their origins, specifically from fossil fuels and microbes.
- The results reveal that the actual composition of atmospheric methane differs from model predictions and highlight a significant microbial contribution that had been underestimated in previous studies.
- The findings show that isotopologue data can effectively differentiate between various emissions scenarios, despite consistent atmospheric methane concentration profiles and traditional isotopic measurements.
Deep marine sediments (>1mbsf) harbor ~26% of microbial biomass and are the largest reservoir of methane on Earth. Yet, the deep subsurface biosphere and controls on its contribution to methane production remain underexplored. Here, we use a multidisciplinary approach to examine methanogenesis in sediments (down to 295 mbsf) from sites with varying degrees of thermal alteration (none, past, current) at Guaymas Basin (Gulf of California) for the first time.
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