Geophysics & Environmental Physics

The net change in Earth's energy balance per unit area at the tropopause due to an environmental driver of climate change.

ΔF = F_incoming - F_outgoing W/m² (Watts per square meter)

A geochronological technique used to determine the absolute age of rocks and minerals by measuring radioisotope parent-to-daughter ratios.

t = (1 / λ) ln(1 + D / P) (Parent P → Daughter D) Ma or Ga (Millions / Billions of Years)

Geophysics & Environmental Physics

The environmental migration of radioactive Radon-222 gas from decaying uranium in rocks and soil into indoor building spaces.

Decay Chain: ²³⁸U → ²²⁶Ra → ²²²Rn (Half-life = 3.82 days) Bq/m³ or pCi/L (Activity Concentration)

Geophysics & Environmental Physics

The ratio of the actual vapor pressure of water in an air parcel to the saturation vapor pressure at the same temperature, expressed as a…

RH = (e / e_s(T)) × 100% Percentage (%)

Geophysics & Environmental Physics

The acquisition of geophysical information about Earth's surface and atmosphere from a distance using satellite or airborne sensors.

NDVI = (NIR - Red) / (NIR + Red) Multi-Spectral Satellite Imagery

Geophysics & Environmental Physics

A base-10 logarithmic scale quantifying earthquake magnitude based on the maximum amplitude of seismic waves recorded on a seismograph.

M_L = log₁₀(A / A₀), M_w = ⅔ log₁₀(M₀) - 6.07 Logarithmic Magnitude (M_L / M_w)