Net photosynthesis from sensitivity runs of a simulated intertidal macroalgal canopy

10,000 runs of a 14 day period for a simulated macroalgal canopy. Field descriptions are as follows below. Parameter values vary at random within defined boundaries. The output is summarized by the column netpsn: the average daily carbon flux due to photosynthesis. TAI, fracshore and photoperday are derived from other variables. For example, TAI depends on frond allometry, frond density and frond height. Field Description Units a.intercept Allometry intercept m2 a.slope Allometry slope m kappa Canopy attenuation coefficient TAI-1 daylength hours days Days simulated days n.fronds Density of fronds m-2 D.rate Desiccation rate s-1 Shorelevel Height of algae on shore relative to LAT m hydration Rehydration rate of submerged fronds % minute-1 alpha Initial slope P-I curve mmol C (mmol photon)-1 Pmaxintercept Intercept for aerial Pmax with water content mmol C m-2 frond s-1 M2amp M2 tidal amplitude m Pmax Maximum gross photosynthetic rate mmol C m-2 frond s-1 f.mean Frond height m Isurf Midday irradiance mmol photon m-2 s-1 Pmax.slope Initial slope P-I curve mmol C (mmol photon)-1 recoverythresh Desiccation recovery threshold % resp Respiration rate mmol C g-1 s-1 S2amp S2 tidal amplitude m S2phase S2 tidal phase lag ° TSM Thallus specific mass g (dry mass) m-2 lambda Water attenuation coefficient for light (PAR) m-1 netpsn Net photosynthesis g C m-2 day-1 photo per day Photon flux per day mmol photon m-2 day-1 fracshore Vertical position of fronds relative to high tide fraction TAI Thallus area index ratio