Table 1
Estimates of COS and H2 fluxes (F) and deposition velocities (ν) during nocturnal stable conditions (Gif-sur-Yvette, in 2011).
Fig. 1
COS, CO and H2 mole fractions, and 222Rn activity during November–December 2011 at Gif-sur-Yvette. The vertical red dashed lines indicate stable atmospheric conditions (radon highs) associated with H2 highs and COS lows. The vertical blue dashed lines indicate stable atmospheric conditions associated with H2 and COS lows. Major COS lows are numbered 1–7. The yellow vertical bands correspond to the sunlit hours from sunrise to sunset. From late November to mid December, the sun rises between 7:17 and 7:35 am and sets between 3:57 and 4:01 pm UTC.
Fig. 2
COS, CO and H2 mole fractions, and 222Rn activity during early February (left column), late March (middle column) and early August 2011 (right column) at Gif-sur-Yvette. The vertical red dashed lines indicate stable atmospheric conditions (radon highs) associated with H2 highs and COS lows. The vertical blue dashed lines indicate stable atmospheric conditions associated with H2 and COS lows. The vertical black dashed lines indicate stable atmospheric conditions associated with H2 lows and COS highs. The yellow vertical bands correspond to the sunlit hours from sunrise to sunset. In early February, the sun rises between 7:14 and 7:19 am and sets between 4:51 and 4:55 pm UTC. In late March, the sun rises between 5:39 and 5:45 am and sets between 6:09 and 6:14 pm. In early August, the sun rises between 4:23 and 4:27 am and sets between 7:27 and 7:31 pm.
Fig. 3
Correlation of the COS and H2 mole fractions to 222Rn activity during nocturnal stable atmospheric conditions (February 1–2/2011). H2 levels recorded during rush hours (5:30–8:30 UTC) are plotted with open squares.
Fig. 4
A comparison of the observed COS and H2 deposition velocities. Error bars represent the overall uncertainty of each deposition event.