11. Anlauf (MSC), Carroll (UM)

13. Figure 1. Stratigraphy of site A, 300 m SE of FTX
7 february snowfall
3 february snowfall
hard wind blown snow
 25 cm
Depth hoar
ground
F. Domine, LGGE

16. Irradiance spectra
W. Simpson, UAF

17. A. Grannas, Purdue U

18. Quartz snow chamber

21. H. Beine, MTU and CNR

22. H. Beine, MTU and CNR

24. Zhou, SUNYA

26. A.L. Sumner, Purdue U

27. H. Boudries, MSC

28. The diel average of that data is shown here, which perhaps more clearly shows the correlation with radiation.
A. Grannas, Purdue U

29. Acetone is too long lived for gas phase chemistry, even involving Cl,
In the case of acetone, it also exhibits a diel cycle, although with a smaller amplitude. It also is less clear whether it correlates better with T (top) or rad (bottom). In the case of acetone, chemistry in the gas phase is too slow to make it decrease at night, so the decrease has to be caused by uptake in the snowpack. (For CH3CHO one could argue for the fun of it, that at night the Cl/Br ratio decreases, which would tend to make the conc. Decrease (decreasing prod./increasing destr.))
Acetone is too long lived for gas phase
chemistry, even involving Cl,
to have an impact on its conc.,
on these time scales.
A. Grannas, Purdue U

30. H. Boudries, MSC

31. Figure 2.
C. Guimbaud, Purdue U

32. K. Foster, UCI

33. C. Spicer, Battelle

34. K. Foster, UCI

35. Total gaseous mercury during 1995 at Alert, Canada
9 April – 29 May, 1995
From: Schroeder et al., Nature 394: , 1998

36. Steffen, MSC

37. Steffen, MSC

38. Steffen, MSC