Atmospheric anionic and VOCs composition from Detroit Plateau, Antarctic Peninsula
Abstract
In the context of Climate of Antarctica and South America project (CASA/ Brasil-Chile-EUA scientific cooperation) atmospheric sampling were performed in 2007 austral summer (nov-dec) at Detroit Plateau (64°05'07”S, 59°38'42”W, ~ 2,000 m above sea level) in the Antarctic Peninsula, aiming to analyze the anionic and VOCs (Volatile Organic Compounds) composition in the low atmosphere, and to better understand the regional atmospheric transport patterns. Air samples were collected using stainless steel canisters and filter pack. Local climatological data were obtained from an AWS installed in the site during the scientific expedition and regional data are based on NCEP/NCAR and NOAA HYSPLIT reanalyzes. Air samples were collected using eight 2.5L-canisters, and 0.1µm pore size Nuclepore filter at 6h / day intervals. In laboratory, after cryogenic concentration, air samples from canisters were analyzed using gas chromatography (GC/MS). While all filters were leached out with 15 mL Milli-Q water using a ultrasound device, and these solutions were sealed in Teflon vials until later analysis through an ICPMS (Inductively Coupled Plasma Mass Spectroscopy) system. Analyses of the AWS data, during the studied period, showed a mean temperature of -10.4 ± 3.8oC, while the atmospheric pressure was 770.1 ± 10.2 hPa. Results from atmospheric reanalyzes indicates that Detroit Plateau has a significant influence of continental and marine aerosols. Al and Fe were the main represents in the aerosol with terrigenous influence, while Na showed the high concentration in the aerosol with marine influence. Total quantification of VOCs in the local atmosphere showed mean value of 9.8 ug/m3, with maximum (34.1 ug/m3) observed in 29 November and minimum (1.3 ug/m3) during 12 December. Our previous results indicate Detroit Plateau as a well preserved atmospheric site, allowing its use for climatological/glaciological studies.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2009
- Bibcode:
- 2009AGUFM.A31C0125A
- Keywords:
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- 0305 ATMOSPHERIC COMPOSITION AND STRUCTURE / Aerosols and particles