reference page / compiled by J.L. Jimenez / CU Boulder

Atmos
Chem
Desk

The complete original cheat sheet is embedded here, with quick jumps, lab-style calculators, and reaction prompts built around the values in the document.

Version 1.29
Last update 22 May 2015 22 page PDF
local site copy included Original source

ac-cheat.pdf

Download

document map

Jump
Table

Use these tiles to move the embedded PDF to the major regions of the original document. The full PDF remains the complete source of truth on this page.

interactive scratchpad

Lab
Tools

Small calculators for the common moves in the sheet: convert ppb to molecules, estimate mass concentration, and turn exposure into an atmospheric clock.

Mixing Ratio Converter

Mixing ratio Unit

Pressure, mbar Temperature, K

At 298 K and 1 atm: 1 ppb = 2.46e10 molec cm^-3. Scale by P/1 atm and 298/T.

Mass Concentration

Mixing ratio, ppb Molecular weight

Pressure, mbar Temperature, K

A (µg m^-3) = A (ppb) x 0.0409 x MW at 298 K and 1 atm.

Oxidant Exposure Clock

Elapsed time Time unit

Oxidant Custom concentration

Exposure = oxidant concentration x seconds. OH age = OH exposure / 1.5e6 molec cm^-3.

rate constants / lifetimes

Reaction
Deck

Select a reaction to see a quick lifetime estimate under the sheet's typical ambient assumptions. These are intentionally pocket-calculator simple.

selected reaction

OH + NO2