Forçante aerossóis
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
-0.02 × Tg SO₄
About this calculator
The aerosol forcing calculator estimates the climate impact of atmospheric particles, such as sulfates (SO₄), using the formula FF = -0.8 × ln(C/C₀), where C is current concentration and C₀ is reference. Negative results indicate radiative cooling. Values are expressed in watts per square meter (W/m²), commonly used in climate studies. This tool helps assess the influence of atmospheric pollutants on solar radiation.
The formula considers sulfur dioxide (SO₂) mass converted to sulfates, expressed in teragrams (Tg). For example, 1 Tg SO₂ equals -0.02 W/m². The logarithmic relation reflects saturation effects as concentrations increase. This method is widely used in climate models to predict changes caused by industrial emissions or volcanic activity.
Use the calculator in studies involving industrial emissions, air pollution monitoring, or climate scenario analysis. Ensure updated aerosol concentration data and understand specific particle types, like sulfates, nitrates, or black carbon, which have different forcing effects. Avoid hypothetical values without scientific basis.
Note: the calculation assumes ideal atmospheric conditions and ignores complex interactions with clouds or non-sulfate particles. Results should be interpreted with complementary models, such as greenhouse gas forcing calculations. High-quality data and geographic context are essential for accuracy.
Frequently asked questions
Why is the aerosol forcing result negative?
The negative sign indicates that aerosols reflect solar radiation, causing radiative cooling. The formula FF = -0.8 × ln(C/C₀) quantifies this atmospheric cooling effect.
How to convert tons of SO₂ into W/m²?
Use the relation 1 Tg SO₂ = -0.02 W/m². For example, 5 Tg SO₂ equals -0.1 W/m². This is based on converting sulfur dioxide to sulfates in the atmosphere.
Do I need historical data to use the calculator?
Yes, the formula requires current (C) and reference (C₀) concentrations. Historical industrial or volcanic emission data is ideal to compare changes over time.
Which aerosols are included in the calculation?
The calculator focuses on sulfates (SO₄) from sulfur dioxide. Other types, like black carbon or nitrates, require specific formulas since they have different forcing effects.