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. 2016 Feb 15;7:25. doi: 10.3389/fmicb.2016.00025

Table 1.

Physical and geochemical parameters measured over four field seasons corresponding to in situ slide incubations.

Spring (Position) Temperature (°C) pH Channel velocity (cm s−1) Reynolds number O2 (aq) Fe (TS) As (TS) CO2 (aq) DOC H2 (aq)
μM nM
One Hundred Spring Plain (B) 72.8 (1.4) 3.5 (0.1) 2–5 1.5 • 103 33 (11) 25 (7) 24 (6) 100 (40) 109 (55) 39 (40)
Beowulf (D) 67.6 (1.8) 2.9 (0.1) 20–30 1.4 • 104 44 (6) 30 (3) 28 (4) 200 (180) 52 (12) 13 (7)

Numbers in parentheses are equal to ± 1 standard deviation from the mean.

Reynolds Number = inertial forces/viscous forces, ρVD/μ: ρ = density of fluid (kg/m−3), V = fluid velocity (ms−1), D = channel depth (m), and μ = dynamic fluid viscosity [kg (ms)−1]. DOC, dissolved organic carbon.