Heavy methanes as atmospheric tracers

Area of Science:

• Atmospheric Science
• Environmental Chemistry

Background:

• Accurate atmospheric transport and diffusion models are crucial for understanding environmental processes.
• Nonradioactive tracers offer a safe alternative for long-range atmospheric studies.

Purpose of the Study:

• To evaluate the utility of Methane-21 ((13)CD(4)) as a nonradioactive tracer for continental-scale atmospheric transport and diffusion model testing.
• To demonstrate the long-range detection capabilities of Methane-21.

Main Methods:

• A controlled release of 84 grams of Methane-21 was conducted.
• Air samples were collected at distances ranging from 1500 to 2500 kilometers from the release point.
• Methane was separated from air samples, and Methane-21 content was quantified using mass spectrometry.

Main Results:

• Methane-21 was detected at long distances (1500-2500 km).
• Concentrations detected were approximately 1 part in 2 x 10(16) parts by volume.
• The experiment confirmed the feasibility of detecting Methane-21 at significant atmospheric distances.

Conclusions:

• Methane-21 ((13)CD(4)) is a viable nonradioactive tracer for continental-scale atmospheric studies.
• The detection method using mass spectrometry is effective for identifying Methane-21 at low concentrations over long distances.
• This tracer has significant potential for validating atmospheric transport and diffusion models.