TY - JOUR
T1 - Surprisingly small HONO emissions from snow surfaces at Browning Pass, Antarctica
AU - Beine, H. J.
AU - Amoroso, A.
AU - Dominé, F.
AU - King, M. D.
AU - Nardino, M.
AU - Ianniello, A.
AU - France, J. L.
PY - 2006/7/3
Y1 - 2006/7/3
N2 - Measured Fluxes of nitrous acid at Browning Pass, Antarctica were very low, despite conditions that are generally understood as favorable for HONO emissions, including: acidic snow surfaces, an abundance of NO anions in the snow surface, and abundant UV light for NO photolysis. Photochemical modeling suggests noon time HONO fluxes of 5-10 nmol m h ; the measured fluxes, however, were close to zero throughout the campaign. The location and state of NO in snow is crucial to its reactivity. The analysis of soluble mineral ions in snow reveals that the NO ion is probably present in aged snows as NaNO . This is peculiar to our study site, and we suggest that this may affect the photochemical reactivity of NO , by preventing the release of products, or providing a reactive medium for newly formed HONO. In fresh snow, the NO ion is probably present as dissolved or adsorbed HNO and yet, no HONO emissions were observed. We speculate that HONO formation from NO photolysis may involve electron transfer reactions of NO from photosensitized organics and that fresh snows at our site had insufficient concentrations of adequate organic compounds to favor this reaction.
AB - Measured Fluxes of nitrous acid at Browning Pass, Antarctica were very low, despite conditions that are generally understood as favorable for HONO emissions, including: acidic snow surfaces, an abundance of NO anions in the snow surface, and abundant UV light for NO photolysis. Photochemical modeling suggests noon time HONO fluxes of 5-10 nmol m h ; the measured fluxes, however, were close to zero throughout the campaign. The location and state of NO in snow is crucial to its reactivity. The analysis of soluble mineral ions in snow reveals that the NO ion is probably present in aged snows as NaNO . This is peculiar to our study site, and we suggest that this may affect the photochemical reactivity of NO , by preventing the release of products, or providing a reactive medium for newly formed HONO. In fresh snow, the NO ion is probably present as dissolved or adsorbed HNO and yet, no HONO emissions were observed. We speculate that HONO formation from NO photolysis may involve electron transfer reactions of NO from photosensitized organics and that fresh snows at our site had insufficient concentrations of adequate organic compounds to favor this reaction.
KW - atmospheric dynamics
KW - flux measurement
KW - inorganic acid
KW - photolysis
KW - snow cover
KW - ultraviolet radiation
UR - http://www.scopus.com/inward/record.url?scp=33745751379&partnerID=8YFLogxK
U2 - 10.5194/acp-6-2569-2006
DO - 10.5194/acp-6-2569-2006
M3 - Article
AN - SCOPUS:33745751379
VL - 6
SP - 2569
EP - 2580
JO - Atmospheric Chemistry and Physics
JF - Atmospheric Chemistry and Physics
SN - 1680-7324
IS - 9
ER -