Atmosphere-to-snow-to-firn transfer studies of HCHO at Summit, Greenland

Details Atmosphere-to-snow-to-firn transfer studies of HCHO at Summit, Greenland Atmosphere-to-snow-to-firn transfer studies of HCHO at Summit, Greenland

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.1691h&link_type=abstract

Geophysical Research Letters, Volume 26, Issue 12, p. 1691-1694

Physics

54

Atmospheric Composition And Structure, Atmospheric Composition And Structure: Constituent Sources And Sinks, Meteorology And Atmospheric Dynamics: Paleoclimatology, Atmospheric Composition And Structure: Troposphere-Composition And Chemistry

Scientific paper

Formaldehyde (HCHO) measurements in snow, firn, atmosphere, and air in the open pore space of the firn (firn air) at Summit, Greenland, in June 1996 show that the top snow layers are a HCHO source. HCHO concentrations in fresh snow are higher than those in equilibrium with atmospheric concentrations, resulting in HCHO degassing in the days to weeks following snowfall. Maximum HCHO concentrations in firn air were 1.5-2.2 ppbv, while the mean atmospheric HCHO concentration 1 m above the surface was 0.23 ppbv. Apparent HCHO fluxes out of the snow are a plausible explanation for the discrepancy between the 0.1 ppbv atmospheric concentration predicted by photochemical modeling and the measurements. HCHO in deeper firn is near equilibrium with the lower tropospheric HCHO concentration at the annual average temperature. Thus HCHO in ice may in fact be linearly related to multi-year average atmospheric concentrations through a temperature dependent partition coefficient.

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