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sci.NPP-carbon-terrestrial Calculator
Calculates terrestrial net primary productivity (NPP = GPP − R_a) from gross carbon uptake and autotrophic respiration, estimating carbon sequestration. Global terrestrial NPP ≈ 60 Pg C/year — tropical forests account for ~30% despite covering only 10% of land area.
Inputs
Gpp Gc M2 Yr
Reference formula or conversion factor shown for context.
Ra Fraction
Reference formula or conversion factor shown for context.
Heterotrophic Frac
Reference formula or conversion factor shown for context.
Results
net primary productivity NPP (gC/m²/yr)
The result of multiplying all input values together.
net ecosystem productivity NEP (gC/m²/yr)
The result of multiplying all input values together.
carbon use efficiency CUE
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.
CO₂ sequestration (tCO₂/ha/yr)
The proportional relationship between two quantities.
NPP = GPP - Ra
Sample size or count used in the calculation.
biome benchmarks
Reference value for comparison — the industry standard, historical average, or target that this result is measured against.