| Title: | Pivotal Role of Snow Deposition and Melting Driving Fluxes of Polycyclic Aromatic Hydrocarbons at Coastal Livingston Island (Antarctica) |
| Author(s): | Casal P; Cabrerizo A; Vila-Costa M; Pizarro M; Jimenez B; Dachs J; |
| Address: | "Institute of Environmental Assessment and Water Research , Spanish National Research Council (IDAEA-CSIC) , Jordi Girona 18-26 , Barcelona , Catalonia 08034 , Spain. Department of Instrumental Analysis and Environmental Chemistry, Institute of Organic Chemistry , Spanish National Research Council (IQOG-CSIC) , Madrid 28006 , Spain" |
| ISSN/ISBN: | 1520-5851 (Electronic) 0013-936X (Linking) |
| Abstract: | "The atmosphere-land-ocean dynamics of semivolatile organic compounds in polar regions is poorly understood, also for the abundant and ubiquitous polycyclic aromatic hydrocarbons (PAHs). We report the concentrations and fluxes of PAHs in a polar coastal ecosystem (Livingston Island, Antarctica). From late spring (December 2014) to late summer (February 2015), we sampled air, snow, coastal seawater, plankton, and the fugacity in soils and snow. The concentrations of PAHs in seawater were low but increased during the austral summer. The PAH concentrations in snow were significantly higher than in coastal seawater. Soil-air fugacity ratios showed a net volatilization of PAH when soils were covered with lichens, and close to air-soil equilibrium for bare soils. Concentrations in surface snow were also close to equilibrium with atmospheric PAHs. Conversely, there was a net diffusive deposition of PAHs to coastal seawater during late spring, but a net volatilization from seawater during late summer. Volatilization fluxes were correlated with seawater temperature and salinity, consistent with a key role of snowmelt to the fluxes and dissolved phase concentrations during the austral summer. The comprehensive assessment provided here shows that the fugacity amplification in snow is transferred to soils and coastal seawater supporting PAH concentrations and fluxes" |
| Keywords: | *Air Pollutants Antarctic Regions Ecosystem Environmental Monitoring Islands *Polycyclic Aromatic Hydrocarbons Snow; |
| Notes: | "MedlineCasal, Paulo Cabrerizo, Ana Vila-Costa, Maria Pizarro, Mariana Jimenez, Begona Dachs, Jordi eng Research Support, Non-U.S. Gov't 2018/10/03 Environ Sci Technol. 2018 Nov 6; 52(21):12327-12337. doi: 10.1021/acs.est.8b03640. Epub 2018 Oct 16" |
