Significant Emission of Nitrous Acid from Arctic Snow Surfaces During Ozone Depletion

HR: 0800h
AN: A21C-0867 [Abstracts]
TI: Significant Emission of Nitrous Acid from Arctic Snow Surfaces During Ozone Depletion
AU: * Amoroso, A
EM: amoroso@iia.cnr.it
AF: National Research Council- Atmospheric Pollution Institute, Via Salaria Km 29,300 , Monterotondo Scalo, RM 00016 Italy
AU: Beine, H J
EM: harry@iia.cnr.it
AF: National Research Council- Atmospheric Pollution Institute, Via Salaria Km 29,300 , Monterotondo Scalo, RM 00016 Italy
AU: Ianniello, A
EM: ianniello@iia.cnr.it
AF: National Research Council- Atmospheric Pollution Institute, Via Salaria Km 29,300 , Monterotondo Scalo, RM 00016 Italy
AU: Esposito, G
EM: Esposito@iia.cnr.it
AF: National Research Council- Atmospheric Pollution Institute, Via Salaria Km 29,300 , Monterotondo Scalo, RM 00016 Italy
AU: Nardino, M
EM: m.nardino@ibimet.cnr.it
AF: National Research Council-IBIMET, Via Gobetti, 101, Bologna, BO 40129 Italy
AB: HONO, together with NOx, is produced in/on snow surfaces in a photochemical reaction presumably from nitrate ions. During the spring of 2004 we measured HONO fluxes in the Arctic at Ny-Źlesund, Svalbard. Confirming previous measurements, usually no significant emissions occurred from alkaline snow surfaces at this marine high Arctic location. During fresh snowfall atmospheric HONO mixing ratios increased. We observed at one occasion in Arctic air masses that were depleted of ozone HONO emission fluxes of up to 40 nmol m^-2 h^-1. In this work we show the background conditions for the marine high Arctic and discuss the contributing factors for the unsual HONO emission event.
DE: 0312 Air/sea constituent fluxes (3339, 4504)
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
DE: 0736 Snow (1827, 1863)
DE: 0740 Snowmelt
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005