SO2 Mass Flux Tonnes Day
Integrate blank-corrected SO2 cross-plume column mass and multiply by signed normal plume speed; negative nondetections/transport remain signed, with no eruption-alert threshold or wind-direction inference.
Description
A cross-plume gas-column integral measures mass per unit plume length.
A cross-plume gas-column integral measures mass per unit plume length. Multiplying by normal transport speed gives mass flow.
Integrate blank-corrected SO2 cross-plume column mass and multiply by signed normal plume speed; negative nondetections/transport remain signed, with no eruption-alert threshold or wind-direction inference.
When to use SO2 Mass Flux Tonnes Day
Use this tool to integrate blank-corrected SO2 cross-plume column mass and multiply by signed normal plume speed; negative nondetections/transport remain signed, with no eruption-alert threshold or wind-direction inference.
Gather the relevant observations and fitted model parameters. Use the stated units and time basis; keep paired observations aligned.
How to use SO2 Mass Flux Tonnes Day and understand its results
- Gather the relevant observations and fitted model parameters. Use the stated units and time basis; keep paired observations aligned.
- Enter crossPlumeDistancesM, so2ColumnMassesGramsPerM2, blankColumnMassesGramsPerM2, normalPlumeSpeedMPerSecond using the field table and calculation rules, then run the tool.
- Read blankCorrectedColumnIntegralGramsPerM, signedSo2MassFluxTonnesPerDay. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| crossPlumeDistancesM | Cross plume distances m | list of number | Required |
| so2ColumnMassesGramsPerM2 | So2 column masses grams per m2 | list of number | Required |
| blankColumnMassesGramsPerM2 | Blank column masses grams per m2 | list of number | Required |
| normalPlumeSpeedMPerSecond | Normal plume speed m per second | number | Required |
Align nonnegative measured and blank columns with increasing distances. Subtract blanks, integrate by trapezoids, then use the signed normal plume speed. Preserve negative corrected columns and transport.1
Paired lists must be nonempty and have equal lengths.
tonnes/day = trapezoidal integral of corrected g/m² × signed m/s × 0.0864 Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| blankCorrectedColumnIntegralGramsPerM | Blank corrected column integral grams per m | number |
| signedSo2MassFluxTonnesPerDay | Signed so2 mass flux tonnes per day | number |
{
"input": {
"crossPlumeDistancesM": [
0,
10,
20
],
"so2ColumnMassesGramsPerM2": [
0,
2,
0
],
"blankColumnMassesGramsPerM2": [
0,
0.5,
0
],
"normalPlumeSpeedMPerSecond": 10
},
"output": {
"blankCorrectedColumnIntegralGramsPerM": 15,
"signedSo2MassFluxTonnesPerDay": 12.96
}
}Limitations and assumptions
Wind orientation and measurement calibration are supplied; flux alone does not determine an alert level.
Numbers and computed results must be finite; overflow produces an error. Numeric lists are limited to 100,000 entries; the rules above may require smaller limits. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use SO2 Flux Trend Escalation Checker: Monitor observed SO2 multiplicative growth and extrapolated caller flux timing; model assumes unchanged trend and is not an eruption escalation/alert forecast. For a complementary task, use CO2 SO2 Molar Ratio Volcanic: Convert paired mass concentrations to a blank-corrected volcanic CO2/SO2 molar ratio on the same gas basis; signed CO2 nondetections remain explicit and a nonpositive SO2 denominator is not assigned a ratio.
References
-
SO2 Mass Flux Tonnes Day — tool.io
Similar or alternative tools
- SO2 Flux Trend Escalation Checker
Monitor observed SO2 multiplicative growth and extrapolated caller flux timing; model assumes unchanged trend and is not an eruption escalation/alert forecast.
- CO2 SO2 Molar Ratio Volcanic
Convert paired mass concentrations to a blank-corrected volcanic CO2/SO2 molar ratio on the same gas basis; signed CO2 nondetections remain explicit and a nonpositive SO2 denominator is not assigned a ratio.