Skip to page content
USDA Forest Service

Research & Development Treesearch

Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help - We Participate  Government Made Easy

Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (2.0 MB bytes)

Title: Atmospheric dry deposition of sulfur and nitrogen in the Athabasca Oil Sands Region, Alberta, Canada

Author: Hsu, Yu-Mei; Bytnerowicz, Andrzej; Fenn, Mark E.; Percy, Kevin E.;

Date: 2016

Source: Science of The Total Environment. 568: 285-295

Publication Series: Scientific Journal (JRNL)

Description: Due to the potential ecological effects on terrestrial and aquatic ecosystems from atmospheric deposition in the Athabasca Oil Sands Region (AOSR), Alberta, Canada, this study was implemented to estimate atmospheric nitrogen (N) and sulfur (S) inputs. Passive samplers were used to measure ambient concentrations of ammonia (NH3), nitrogen dioxide (NO2), nitric acid/nitrous acid (HNO3/HONO), and sulfur dioxide (SO2) in the AOSR. Concentrations of NO2 and SO2 in winter were higher than those in summer, while seasonal differences of NH3 and HNO3/HONO showed an opposite trend, with higher values in summer. Concentrations of NH3, NO2 and SO2 were high close to the emission sources (oil sands operations and urban areas). NH3 concentrations were also elevated in the southern portion of the domain indicating possible agricultural and urban emission sources to the southwest. HNO3, an oxidation endpoint, showed wider ranges of concentrations and a larger spatial extent. Concentrations of NH3, NO2, HNO3/HONO and SO2 from passive measurements and their monthly deposition velocities calculated by a multi-layer inference model (MLM) were used to calculate dry deposition of N and S. NH3 contributed the largest fraction of deposited N across the network, ranging between 0.70–1.25 kg N ha−1 yr−1, HNO3/HONO deposition ranged between 0.30–0.90 kg N ha−1 yr−1, and NO2 deposition between 0.03–0.70 kg N ha−1 yr−1. During the modeled period, average dry deposition of the inorganic gaseous N species ranged between 1.03 and 2.85 kg N ha−1 yr−1 and SO4-S deposition ranged between 0.26 and 2.04 kg ha−1 yr−1. Comparisons with co-measured ion exchange resin throughfall data (8.51 kg S ha−1 yr−1) indicate that modeled dry deposition combined with measured wet deposition (1.37 kg S ha−1 yr−1) underestimated S deposition. Gas phase NH3 (71%) and HNO3 plus NO2 (79%) dry deposition fluxes dominated the total deposition of NH4-N and NO3-N, respectively.

Keywords: Passive samplers, Atmospheric dry deposition, Nitrogen, Sulfur, Multi-layer inference model, Throughfall measurement

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.



Hsu, Yu-Mei; Bytnerowicz, Andrzej; Fenn, Mark E.; Percy, Kevin E. 2016. Atmospheric dry deposition of sulfur and nitrogen in the Athabasca Oil Sands Region, Alberta, Canada. Science of The Total Environment. 568: 285-295.


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.