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Table 7 Meteorological conditions, friction velocity and Monin–Obukhov length in the Olympic Forest Park and Jiufeng National Forest Park

From: Deposition of water-soluble inorganic ions in PM2.5 in a typical forestry system in Beijing, China

  Olympic Forest Park Jiufeng National Forest Park
Daytime (n = 27) Nighttime (n = 18) Daytime (n = 27) Nighttime (n = 18)
Temperature (°C) 21.38 ± 3.75 19.93 ± 3.20 20.85 ± 3.45 18.54 ± 4.03
Humidity (%) 53.79 ± 11.93 57.48 ± 12.32 58.43 ± 11.98 63.51 ± 17.17
wind speed (m·s− 1) 1.06 ± 0.64 0.79 ± 0.49 1.28 ± 0.73 0.96 ± 0.51
u* (m·s− 1) 0.36 ± 0.27 0.21 ± 0.09 0.42 ± 0.22 0.30 ± 0.13
L (m) −17.13 ± 9.6 28.04 ± 14.52 −16.13 ± 8.77 22.64 ± 7.75