Analysis of ammonia and aerosol concentrations and deposition near the free troposphere at Mt. Mitchell, NC, U.S.A

Measurements of airborne (gaseous and aerosol), cloud water, and precipitation concentrations of ammonia (NH 3) and ammonium (NH + 4) compounds were made at Mt. Mitchell State Park (Mt. Gibbs, ∼2006 m MSL), North Carolina. Measurements were made from May to September during 1988 and 1989. An annular...

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Bibliographic Details
Published in:Atmospheric environment (1994) 1998-02, Vol.32 (3), p.353-358
Main Authors: Aneja, Viney P., Murthy, Anuradha B., Battye, William, Battye, Rebecca, Benjey, William G.
Format: Article
Language:English
Subjects:
ambient monitoring
Ammonia
Applied sciences
Atmospheric pollution
deposition
emissions
Exact sciences and technology
Mt. Mitchell
Pollutants physicochemistry study: properties, effects, reactions, transport and distribution
Pollution
Smoky Mountains
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Summary:Measurements of airborne (gaseous and aerosol), cloud water, and precipitation concentrations of ammonia (NH 3) and ammonium (NH + 4) compounds were made at Mt. Mitchell State Park (Mt. Gibbs, ∼2006 m MSL), North Carolina. Measurements were made from May to September during 1988 and 1989. An annular denuder system was used to determine gaseous NH 3 and particulate NH + 4 and nitrate (NO - 3) compounds. Measurements of NH + 4 in cloud and rain water samples were made during the same time period. Mean concentrations of gaseous NH 3 were 0.62 μg m -3 for 1988 and 1.47 μg m -3 for 1989. Mean concentrations of fine particulate NH + 4 were 1.24 μg m -3 for 1988 and 0.89 μg m -3 for 1989. The NH + 4 concentrations in the cloud water were 214 and 147 μeq ℓ -1 for the 1988 and 1989 field seasons, respectively. The concentrations of NH + 4 in precipitation were quite low compared to cloud ionic values in both 1988 and 1989 at 14 and 15 μeq ℓ -1, respectively. The estimated mean total deposition of NH + 4 over the sampling period (5 months) of 1988 and 1989 was about 0.38 and 0.67 g N m -2 season -1, respectively. Cloud water interception contributed more nitrogen (∼70%) to the total deposition than combined wet (∼15%) and dry (∼15%) deposition.
ISSN:1352-2310
1873-2844
DOI:10.1016/S1352-2310(97)00236-7