Description
Return weighted projected area and effective droplet radius.
Particle and droplet terms depend on size representation, weights, density, drag and logarithmic-bin conventions. A spherical growth or low-Reynolds approximation is a local model term rather than a measured size distribution, composition or health/exposure assessment.
Return weighted projected area and effective droplet radius.
When to use this tool
Use Cloud Droplet Effective Area Term when checking the stated particle, droplet, drag, growth or bin-basis convention.
How to use the tool and how it works
- Enter radii, numberWeights. Follow any array-alignment requirements below. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read projectedArea, effectiveRadius. Use the output convention below.
Return weighted projected area and effective droplet radius. Require aligned nonnegative radii/weights with a positive weighted radius; area = pi*sum(n*r²), effectiveRadius = sum(n*r³)/sum(n*r²).1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| radii | Radii | Required. Array of finite number; maximum items 256. |
| numberWeights | Number Weights | Required. Array of finite number; maximum items 256. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| projectedArea | Projected Area | Required. Finite number. |
| effectiveRadius | Effective Radius | Required. Finite number. |
{
"input": {
"radii": [
1,
2
],
"numberWeights": [
2,
1
]
},
"output": {
"projectedArea": 18.84955592153876,
"effectiveRadius": 1.6666666666666667
}
}Limitations and assumptions
- Weights must have a consistent count/concentration basis; no size distribution is fitted or actual cloud optical response inferred.
- 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 particle measurements and an appropriate complete distribution/transport model with justified material, shape and flow assumptions for atmospheric inference.
References
Similar or alternative tools
- Cloud Droplet Terminal Drag Regime Term
Return Stokes settling speed and its particle Reynolds number.
- Pressure Weighted Layer Share Tool
Calculate pressure weighted layer share from explicit caller-supplied inputs.