HR: 0830h
AN: A11F-0041    [PDF]
TI: Comparing Techniques to Measure Low Mixing Ratios of Nitrous Acid in the Arctic
AU: * Beine, H J
EM: harry@iia.cnr.it
AF: C.N.R. - IIA, Via Salaria, Km 29.3 - CP 10, Monterotondo Scalo, Rm 00016 Italy
AU: Amoroso, A
EM: amoroso_antonio@virgilio.it
AF: C.N.R. - IIA, Via Salaria, Km 29.3 - CP 10, Monterotondo Scalo, Rm 00016 Italy
AU: Ianniello, A
EM: ianniello@iia.cnr.it
AF: C.N.R. - IIA, Via Salaria, Km 29.3 - CP 10, Monterotondo Scalo, Rm 00016 Italy
AU: Esposito, G
EM: giulioe@excite.it
AF: C.N.R. - IIA, Via Salaria, Km 29.3 - CP 10, Monterotondo Scalo, Rm 00016 Italy
AU: Allegrini, I
EM: allegrini@iia.cnr.it
AF: C.N.R. - IIA, Via Salaria, Km 29.3 - CP 10, Monterotondo Scalo, Rm 00016 Italy
AB: Real time measurements of atmospheric nitrous acid (HONO) were made in the European high Arctic at Ny-$\AA$lesund, Svalbard (79$\deg$N) during May 2003 using SA/NED derivatization and subsequent HPLC analysis. Our 3$\sigma$ detection limit was on the order of 1 pmol mol$^{-1}$ in a 10-min measurement. Preliminary measurement results show a diurnal variation of HONO above the snow surface, with a maximum of only 3 - 4 pmol mol$^{-1}$ in the early afternoon. Simultaneous measurements were made using the C.N.R.-IIA filter/denuder technique. This technique yielded results that were systematically higher by a couple of pmol mol$^{-1}$. The systematic differences will be discussed in this work. These results support recent findings that HONO emissions in marine Arctic environments are reduced above alkaline snow surfaces because of the low mobility of the nitrate ion in the snow.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0322 Constituent sources and sinks
DE: 0365 Troposphere--composition and chemistry
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting