Interactive Atmospheric Diagnostics
Photochemical O3 & AOD Radiative Forcing Workbench
Interactive Diagnostic Console
Photochemical O3 Sensitivity & AOD Radiative Forcing Calculator
Governing Equations & Retrieval Assumptions
Photochemical regime boundaries in the upper console apply satellite vertical column densities retrieved from GOME-2 solar backscatter spectra alongside regional Eta-CMAQ chemical mechanisms benchmarked against NOAA P-3 and DC-8 aircraft profiles during ICARTT 2004. Because formaldehyde responds primarily to biogenic isoprene and anthropogenic VOC oxidation while nitrogen dioxide scales inversely with hydroxyl radical lifetime, the column ratio separates radical-terminated VOC control from nitrogen-limited ozone formation.
In aerosol forcing mode, top-of-atmosphere clear-sky radiative flux perturbation follows the two-stream optical depth and backscatter parameterization parameterized over solar insolation, atmospheric transmittance squared, single-scattering albedo absorption asymmetry, and surface reflectance. Elevated surface albedos over snow, arid plateaus, or bright low clouds suppress net scattering cooling and reverse forcing sign once single-scattering albedo drops below roughly 0.88.
Diagnostic Regime Thresholds & Model Provenance
| Console Parameter | Operating Range | Critical Boundary | Archival Reference |
|---|---|---|---|
| GOME-2 HCHO / NO2 Ratio | 0.4 to 12.0 | <1.0 VOC-limited | >2.0 NOx-sensitive | Choi et al. (2012) |
| Eta-CMAQ Mechanism | CB4 / CB05 / SAPRC-99 | CB05 minimizes >=75 ppb O3 bias (+3.9%) | Yu et al. (2010) |
| Single-Scattering Albedo (omega_0) | 0.75 to 0.99 | <0.88 flips TOA forcing positive over bright land | Schulz et al. (2006) |
| 550 nm AOD & Cloud Fraction | AOD 0.02-1.50 | Cf 0.00-0.95 | High Cf screens clear-sky scattering cooling | Huang et al. (2008) |