Atmospheric Chemistry Simulator

Species Concentrations

Log Scale Show All Species

Current Concentrations (ppb)

Reaction Network

Show Reaction Rates

Key Reactions

Simulation Controls

Time Control

Simulated Time: 0.0 hours

Local Time: 12:00

☀️ Daytime

Simulation Speed 1x

Time Step (s) 60

Environmental Conditions

Temperature (K) 298

Pressure (hPa) 1000

Solar Zenith Angle (°) 0

Enable Diurnal Cycle

Emissions & Sources

CH₄ Emission (ppb/day) 10.0

CO Emission (ppb/day) 5.0

NOₓ Level (ppb) 1.0

Initial Conditions

Export Data

About This Simulator

This simulator models the fundamental chemistry of Earth's troposphere, focusing on the oxidation chain: CH₄ → CO → CO₂. It includes key reactions involving OH radicals, ozone photochemistry, and NOₓ cycling.

The model uses a simplified chemical mechanism with ~15 reactions and ~10 key species, solved using the Runge-Kutta 4th order method.

Key Concepts

OH Radical: The "detergent" of the atmosphere, controlling the lifetime of most trace gases
Photolysis: Light-driven reactions (J-values) that vary with solar zenith angle
NOₓ Cycling: NO ↔ NO₂ interconversion controls O₃ production
CH₄ Oxidation: Multi-step process converting methane to CO₂