Advection Fog Sea Delta Checker
Air dewpoint−sea temperature contact-cooling screen with explicit efficiency; fog/visibility not established without mixing trajectory and moisture evidence. Caller independently establishes matching units, evidence, method edition and applicability; output is not compliance, diagnosis, work-safety approval, geological identity or validated hazard prediction.
Description
Air dewpoint above sea-surface temperature indicates a potential condensation margin under sufficient cooling.
Air dewpoint above sea-surface temperature indicates a potential condensation margin under sufficient cooling.1
A caller-specified cooling factor only scales that margin; it does not calculate the full air–sea exchange.
When to use Advection Fog Sea Delta Checker
Use this tool to calculate or review the supplied observations under the stated rules. Establish the observation method, units, averaging period and applicable reference or calibration.
How to use Advection Fog Sea Delta Checker and understand its results
- Establish the observation method, units, averaging period and applicable reference or calibration.
- Enter observedAdvectedAirDewpointC, observedSeaSurfaceC, callerContactCoolingEfficiency, using the field meanings and rules below, then run the tool.
- Read signedDewpointSeaDeltaC, conditionalContactSaturationMarginC, using the output meanings and calculation rules below.
- Correct any reported input issue and run again. Before using a successful result, check the stated units, signs, reference scope and observation coverage.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| observedAdvectedAirDewpointC | Observed advected air dewpoint c | number | Required |
| observedSeaSurfaceC | Observed sea surface c | number | Required |
| callerContactCoolingEfficiency | Caller contact cooling efficiency | number | Required |
Use finite dewpoint and sea-surface temperatures on the same Celsius basis and a contact-cooling efficiency in [0,1]. Return dewpoint−seaSurface and that signed difference multiplied by efficiency.
dewpointSeaMarginC=dewpointC−seaSurfaceC; scaledMarginC=efficiency×dewpointSeaMarginC Use the matching field units and the exact boundary, ordering and reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| signedDewpointSeaDeltaC | Signed dewpoint sea delta c; preserve the subtraction order and sign defined in the mechanics | number |
| conditionalContactSaturationMarginC | Conditional contact saturation margin c; preserve the subtraction order and sign defined in the mechanics | number |
{
"input": {
"observedAdvectedAirDewpointC": 15,
"observedSeaSurfaceC": 10,
"callerContactCoolingEfficiency": 0.5
},
"output": {
"signedDewpointSeaDeltaC": 5,
"conditionalContactSaturationMarginC": 2.5
}
}Limitations and assumptions
No air-temperature evolution, moisture budget, wind or visibility is modeled. A positive margin is a limited diagnostic, not a fog prediction.
Missing required fields, unknown fields, wrong types and violated rules return input issues. Numeric values and outputs must be finite.
Alternative or Complementary methods
For a related step, use Freezing Fog Rime Deposit Rate Lookup: Freezing-fog deposits vary with droplet conditions, exposure and surface properties. For a complementary comparison, use Air Mass Source Region Classifier: Air-mass source classifications depend on independently established source-region and thermodynamic evidence.
References
-
Advection Fog Sea Delta Checker — tool.io
Similar or alternative tools
- Freezing Fog Rime Deposit Rate Lookup
Freezing-fog deposits vary with droplet conditions, exposure and surface properties.
- Air Mass Source Region Classifier
Air-mass source classifications depend on independently established source-region and thermodynamic evidence.