HR: 17:00h
AN: A24A-04    [Abstracts]
TI: Surprisingly Small HONO Emissions Fluxes From Snow Surfaces at Browning Pass, Antarctica
AU: * Beine, H J
EM: harry@iia.cnr.it
AF: C.N.R. - IIA, Via Salaria Km 29,3, Monterotondo Scalo, RM 00016 Italy
AU: Amoroso, A
EM: amoroso@iia.cnr.it
AF: C.N.R. - IIA, Via Salaria Km 29,3, Monterotondo Scalo, RM 00016 Italy
AU: Domine, F
EM: florent@lgge.obs.ujf-grenoble.fr
AF: CNRS - LGGE, BP 96, 54 rue Moliere, Saint Martin d'HŠres, 38402 France
AU: King, M
EM: m.king@gl.rhul.ac.uk
AF: Royal Holloway University London, Egham, Surrey, TW20 0EX United Kingdom
AU: Nardino, M
EM: M.Nardino@ibimet.cnr.it
AF: CNR-IBIMET sez.Bologna, via Gobetti 101, Bologna, 40129 Italy
AU: Ianniello, A
EM: ianniello@iia.cnr.it
AF: C.N.R. - IIA, Via Salaria Km 29,3, Monterotondo Scalo, RM 00016 Italy
AU: France, J
EM: J.L.France@rhul.ac.uk
AF: Royal Holloway University London, Egham, Surrey, TW20 0EX United Kingdom
AB: Emission fluxes of nitrous acid (HONO) during the Arctic winter spring transition were found to be in the range of 40 to 60 nmol m^-2 h^-1. In contrast, measured HONO fluxes at Browning Pass, Antarctica were very low (median 0.2 nmol m^-2 h^-1), despite conditions that are generally understood as favorable for HONO emissions, including: acidic snow surfaces, an abundance of NO₃^- anions in the snow surface, and abundant UV light for NO₃^- photolysis. We discuss the possibility that the currently accepted formation mechanism for HONO in snow and our understanding of snow interstitial ionic and photochemical processes are incomplete, and that most likely more components than just photolyzable NO₃^- in snow are necessary to produce HONO.
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
DE: 0736 Snow (1827, 1863)
DE: 1610 Atmosphere (0315, 0325)
DE: 3322 Land/atmosphere interactions (1218, 1631, 1843)
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005