Instrumentation and Measurement of Atmospheric Trace Gases

Instrumentation and Measurement of Atmospheric Trace Gases
  1. List important measurable trace components of air.
  2. Explain why it is important to monitor the key trace gases present in the air.
  3. Define the different units used to describe the amount of trace gases in the atmosphere, including dry air mole fraction, mixing ratio, number density, and partial pressure.
  4. Characterize the primary types of measurements used to measure different trace gas components in the air (including optical and molecular spectrometry, chromatographic, and chemical conversion methods).
  5. Identify key instruments that are associated with each measurement technique.
  6. Describe common issues in the measurement of trace gases, including inlet losses, sample contamination, transformations prior to analysis, and sensor drift.
  7. Categorize the factors required to be sure that a particular instrument will have adequate uncertainty specifications and will provide measurements representative of the atmospheric phenomenon to be studied.
  8. Explain the types of calibration methods used to quantify gas composition of the atmosphere.