Constantin Andronache

  • Boston College, Chestnut Hill, Massachusetts, USA

Received: May 15, 2015
Revised: August 6, 2015
Accepted: September 10, 2015
Download Citation: ||  

  • Download: PDF

Cite this article:
Andronache, C (2016). Dependence of Daily Aerosol Wet Deposition on Precipitation at Appalachian Mountains Site in the United States. Aerosol Air Qual. Res. 16: 665-673.


  • We examine aerosol wet deposition at mountain site in Eastern United States.
  • The wet deposition flux has significant seasonal variation.
  • High wet deposition during summer is favored by intense precipitation events.
  • Wet deposition is influenced by the origin of air masses and meteorology.



The wet removal of airborne particulates is a significant component of atmospheric deposition in the Eastern United States. This study analyzed the daily wet deposition of major ions at the Canaan Valley site in Appalachian Mountains in Eastern US, for the time interval 2000–2014. The site is part of the Atmospheric Integrated Research Monitoring Network (AIRMoN), and is significantly impacted by acid precipitation, caused largely by anthropogenic sources of SO2 and NOx. Results show that the precipitation rate, R, varies mainly in the interval [0.01–100] mm day–1, and the daily wet deposition flux, F, varies about two orders of magnitude for most ions. The largest daily wet depositions are for SO42– and NO3 with extreme values over 30 mg m–2 day–1. In the case of NH4+, the largest daily wet depositions are over 10 mg m–2 day–1. Seasonal variations are illustrated by contrasting the winter and summer. In general, there are much larger daily wet deposition fluxes in summer than in winter. For SO42– there is more conversion of SO2 to SO42– in the gas phase and in cloud droplets during summer. Similarly, NH4+ has a distinct seasonal variation with a maximum in summer, consistent with larger sources of NH3 during the growth season. NO3 has a maximum concentration in precipitation during winter, and a maximum daily wet deposition flux during summer, especially during the most intense rain events. The Na+ and Cl ions have the highest wet deposition in winter due to storms that bring air masses from Atlantic. Analysis shows that precipitation events are more frequent and more intense in summer than in winter. For the Canaan Valley, the summer precipitation events are effective in wet removal of aerosols providing episodes with some of the highest rates of acid deposition.

Keywords: Wet deposition; Air pollution; Aerosol-cloud interactions; Precipitation; Acid rain

Share this article with your colleagues 


Subscribe to our Newsletter 

Aerosol and Air Quality Research has published over 2,000 peer-reviewed articles. Enter your email address to receive latest updates and research articles to your inbox every second week.

77st percentile
Powered by
   SCImago Journal & Country Rank

2022 Impact Factor: 4.0
5-Year Impact Factor: 3.4

Aerosol and Air Quality Research partners with Publons

CLOCKSS system has permission to ingest, preserve, and serve this Archival Unit
CLOCKSS system has permission to ingest, preserve, and serve this Archival Unit

Aerosol and Air Quality Research (AAQR) is an independently-run non-profit journal that promotes submissions of high-quality research and strives to be one of the leading aerosol and air quality open-access journals in the world. We use cookies on this website to personalize content to improve your user experience and analyze our traffic. By using this site you agree to its use of cookies.