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A mass spectrum is the graphical representation of the relative abundance of the charged fragments in an analyte plotted against their mass-to-charge ratio (m/z). The plot's x-axis represents the ratio of the mass of the charged fragment to the number of charges it carries. The y axis of the plot represents the relative abundance of each charged species. The relative abundance is calculated from the signal intensity of each charged species recorded at the detector. The most intense signal (the...
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Archaea, named after the Archaean eon, represent a unique domain of life, distinct from bacteria and eukaryotes, with remarkable traits. Their cellular and molecular features, ecological adaptability, and industrial relevance highlight their importance in understanding life processes and leveraging biotechnology.Cellular and Molecular CharacteristicsA defining feature of archaea is their unique membrane composition. Archaeal membranes contain ether-linked isoprenoid lipids, which confer...
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Design and Use of a Full Flow Sampling System FFS for the Quantification of Methane Emissions
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California's methane super-emitters.

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Area of Science:

  • Environmental Science
  • Atmospheric Chemistry
  • Remote Sensing

Background:

  • Methane is a potent greenhouse gas, and its mitigation is a global priority.
  • Point-source methane emitters are significant but poorly characterized.
  • Accurate data on methane emissions are crucial for effective mitigation strategies.

Purpose of the Study:

  • To quantify methane point-source emissions across California's infrastructure.
  • To identify and locate major methane emitters using airborne remote sensing.
  • To assess the contribution of point sources to the state's total methane inventory.

Main Methods:

  • Conducted five airborne imaging spectrometer surveys from 2016-2018.
  • Mapped over 272,000 infrastructure elements across oil and gas, manure, and waste sectors.
  • Detected, geolocated, and quantified methane plumes from 564 strong point sources.

Main Results:

  • Estimated net methane point-source emissions at 0.618 Tg/year, representing 34-46% of California's 2016 inventory.
  • Identified that 10% of point sources contribute ~60% of total point-source emissions.
  • Found landfills, dairies, and oil/gas sectors as dominant emitters, with landfills being the largest.

Conclusions:

  • Airborne remote sensing provides high-resolution data for methane emission assessment.
  • A small fraction of infrastructure is responsible for a disproportionately large share of methane emissions.
  • Data sharing facilitated mitigation of anomalous methane emissions in California.