Description
Return first-order trace-gas lifetime and remaining concentration.
Atmospheric reaction, partitioning and deposition terms depend on supplied rates, spectral coordinates, coefficient definitions and transport assumptions. One bin or first-order factor is distinct from a complete chemical mechanism, evolving plume or verified treatment/exposure outcome.
Return first-order trace-gas lifetime and remaining concentration.
When to use this tool
Use Trace Gas Lifetime First Order Loss Factor when evaluating the stated atmospheric reaction, photolysis, partitioning or transport term.
How to use the tool and how it works
- Enter lossRate, elapsed, initialConcentration. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read lifetime, retainedFraction, concentration. Use the output convention below.
Return first-order trace-gas lifetime and remaining concentration. Require lossRate > 0 and elapsed/initialConcentration >= 0; lifetime = 1/rate, retainedFraction = exp(-rate*elapsed), concentration multiplies the initial value.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| lossRate | Loss Rate | Required. Finite number; strictly above 0. |
| elapsed | Elapsed | Required. Finite number; minimum 0. |
| initialConcentration | Initial Concentration | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| lifetime | Lifetime | Required. Finite number. |
| retainedFraction | Retained Fraction | Required. Finite number. |
| concentration | Concentration | Required. Finite number. |
{
"input": {
"lossRate": 0.5,
"elapsed": 2,
"initialConcentration": 100
},
"output": {
"lifetime": 2,
"retainedFraction": 0.36787944117144233,
"concentration": 36.787944117144235
}
}Limitations and assumptions
- This assumes constant first-order loss without sources, mixing or changing conditions; no actual atmospheric lifetime is fitted.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use verified coefficients and a complete suitable chemical/transport or spectral model, including changing conditions and omitted processes, for environmental conclusions.
References
Similar or alternative tools
- Oxidation Exposure Concentration Time Product
Return constant-oxidant exposure and exponential retention.
- Trace Gas Reference Mole Gap Tool
Calculate trace gas reference mole gap from explicit caller-supplied inputs.