Fig 3. Median diurnal courses of measured air and respective derived ‘big-leaf’ surface variables for the summer months of all available site years (JJA).

Lines depict median diurnal courses of all available site years and shaded areas the interquartile range. Surface conditions were calculated with G_a calculated from Eqs 2 and 7 (with D_l taken as 0.02, 0.008, and 0.035 m for AT-Neu, DE-Tha, and FR-Pue, respectively). Radiometric surface temperature in panels a-c was calculated according to Eq 14 assuming a constant longwave emissivity of 0.98.