Abstract
To characterize the concentrations and size distributions of water-soluble organic and inorganic aerosol species, including Na+, non-sea-salt sulfate (nss SO42-), methane sulfonate (MSA), oxalate, and succinate, over the Southern Ocean (SO) and coastal East Antarctica (CEA), bulk and size-segregated aerosols were collected from 40°S, 100°E to 69°S, 76°E and between 69°S, 76°E and 66°S, 110°E during a cruise from November 2010 to March 2011. Results show that sea salt was the major component of the total aerosol mass, accounting for 72% over the SO and 56% over CEA. The average concentrations of nss SO42- varied from 420 ng m-3 over the SO to 480 ng m-3 over CEA. The concentrations of MSA ranged from 63 to 87 ng m-3 over the SO and from 46 to 170 ng m-3 in CEA. The average concentrations of oxalate were 3.8 ng m-3 over the SO and 2.2 ng m-3 over CEA. The concentrations of formate, acetate, and succinate were lower than those of oxalate. A bimodal size distribution of aerosol mass existed over CEA, peaking at 0.32-0.56 μm and 3.2-5.6 μm. MSA was accumulated in particles of 0.32-0.56 μm over CEA. High chloride depletion was associated with fine-mode particles enriched with nss SO42-, MSA, and oxalate. Higher cation-to-anion and NH4+/nss SO 42- ratios in aerosols over CEA compared to that over the SO imply the higher neutralization capacity of the marine atmosphere over CEA. Key Points High MSA/nss SO42- over coastal Antarctica affected by high MSA concentration Organic aerosol species were enriched in fine-mode particles Nss SO42- MSA, oxalate, and formate in fine mode caused high Cl depletion
Original language | English (US) |
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Pages (from-to) | 13,303-13,318 |
Journal | Journal of Geophysical Research Atmospheres |
Volume | 118 |
Issue number | 23 |
DOIs | |
State | Published - Dec 16 2013 |
All Science Journal Classification (ASJC) codes
- Geophysics
- Forestry
- Oceanography
- Aquatic Science
- Ecology
- Water Science and Technology
- Soil Science
- Geochemistry and Petrology
- Earth-Surface Processes
- Atmospheric Science
- Earth and Planetary Sciences (miscellaneous)
- Space and Planetary Science
- Palaeontology
Keywords
- Southern Ocean
- aerosol size distribution
- coastal Antarctica
- inorganic and organic ions
- water-soluble aerosols