HR: 0800h
AN: A11B-0035 [Abstracts]
TI: Fluxes of Nitrous Acid from Snow Surfaces in 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: Domin‚, F
EM: fdomine@iarc.uaf.edu
AF: CNRS - LGGE, BP 96, Saint Martin d'HŠres, 38402
France
AU: Ianniello, A
EM: ianniello@iia.cnr.it
AF: C.N.R. - IIA, Via Salaria Km 29,3, Monterotondo Scalo, RM 00016
Italy
AU: Georgiadis, T
EM: T.Georgiadis@ibimet.cnr.it
AF: C.N.R. - ibimet, Via Gobetti, 101, Bologna, BO 40129
Italy
AU: Nardino, M
EM: nardino@ibimet.cnr.it
AF: C.N.R. - ibimet, Via Gobetti, 101, Bologna, BO 40129
Italy
AU: King, M
EM: m.king@gl.rhul.ac.uk
AF: Royal Holloway U. of London, Egham, Surrey, TW20 0EX
United Kingdom
AB:
Mixing ratios of nitrous acid (HONO), 3-D micrometeorology, physical and chemical snow characteristics and UV insolation in
and above the snow surface are being measured at Browning Pass ($163\deg$52' East, $74\deg$38' South), near the Italian
Antarctic station "Mario Zucchelli" (formerly "Terra Nova Bay") between mid October and mid December 2004. The field site is
ca. 10 km inland, but effectively removed from coastal/marine influences by the Northern Foothills (with peaks up to 800 m
altitude), and the prevailing katabatic winds.
Previous measurements in coastal Antarctica during springtime of 2003 showed minute HONO fluxes. This was ascribed to the
sea salt deposition onto the snow surface and resulting alkaline snow, which reduced the mobility of nitrate anions in the
snow, and such the availability of HONO precursors in the photochemically active surface layer.
Here we will present preliminary results from the ongoing field campaign, and discuss the relationship between snow
properties and HONO emissions.
DE: 1610 Atmosphere (0315, 0325)
DE: 0315 Biosphere/atmosphere interactions
DE: 0322 Constituent sources and sinks
DE: 0365 Troposphere--composition and chemistry
DE: 0400 Biogeosciences
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting