title: An enhanced approach for the use of satellite-derived leaf area index values in dry deposition modeling in the Athabasca oil sands region.
abstract: In the Athabasca oil sands region (AOSR) of Northern Alberta, the dry deposition of sulphur and nitrogen compounds represents a major fraction of total (wet plus dry) deposition due to oil sands emissions. The leaf area index (LAI) is a critical parameter that affects the dry deposition of these gaseous and particulate compounds to the surrounding boreal forest canopy. For this study, LAI values based on Moderate Resolution Imaging Spectroradiometer satellite imagery were obtained and compared to ground-based measurements, and two limitations with the satellite data were identified. The satellite LAI data firstly represents one-sided LAI values that do not account for the enhanced LAI associated with needle leaf geometry, and secondly, underestimates LAI in winter-time northern latitude regions. An approach for adjusting satellite LAI values for different boreal forest cover types, as a function of time of year, was developed to produce more representative LAI values that can be used by air quality sulphur and nitrogen deposition models. The application of the approach increases the AOSR average LAI for January from 0.19 to 1.40, which represents an increase of 637%. Based on the application of the CALMET/CALPUFF model system, this increases the predicted regional average dry deposition of sulphur and nitrogen compounds for January by factors of 1.40 to 1.30, respectively. The corresponding AOSR average LAI for July increased from 2.8 to 4.0, which represents an increase of 43%. This increases the predicted regional average dry deposition of sulphur and nitrogen compounds for July by factors of 1.28 to 1.22, respectively. These findings reinforce the importance of the LAI metric for predicting the dry deposition of sulphur and nitrogen compounds. While satellite data can provide enhanced spatial and temporal resolution, adjustments are identified to overcome associated limitations. This work is considered to have application for other deposition model studies where dry deposition represents a significant fraction of total deposition.
authors.affiliation: Stantec, Calgary, AB, T2A 7H8 Canada.
authors.forename: Mervyn
authors.initials: M
authors.lastname: Davies
authors.affiliation: Cumulative Environmental Management Association, Air Working Group, Fort McMurray, AB, T9H 4A4 Canada; Government of Alberta, Alberta Environment and Parks, Edmonton, AB, T6H 4T8, Canada. Electronic address: sunhee.cho@gov.ab.ca.
authors.forename: Sunny
authors.initials: S
authors.lastname: Cho
authors.affiliation: Cumulative Environmental Management Association, Air Working Group, Fort McMurray, AB, T9H 4A4 Canada.
authors.forename: David
authors.initials: D
authors.lastname: Spink
authors.affiliation: Cumulative Environmental Management Association, Air Working Group, Fort McMurray, AB, T9H 4A4 Canada.
authors.forename: Ron
authors.initials: R
authors.lastname: Pauls
authors.affiliation: Stantec, Calgary, AB, T2A 7H8 Canada.
authors.forename: Michael
authors.initials: M
authors.lastname: Desilets
authors.affiliation: Stantec, Calgary, AB, T2A 7H8 Canada.
authors.forename: Yan
authors.initials: Y
authors.lastname: Shen
authors.affiliation: Stantec, Calgary, AB, T2A 7H8 Canada.
authors.forename: Kanwardeep
authors.initials: K
authors.lastname: Bajwa
authors.affiliation: Stantec, Calgary, AB, T2A 7H8 Canada.
authors.forename: Reid
authors.initials: R
authors.lastname: Person
mesh_terms: D000393:Air Pollutants / Q000032:analysis; D000416:Alberta; D004784:Environmental Monitoring / Q000379:methods*; D005740:Gases; D008962:Models, Theoretical; D009584:Nitrogen / Q000032:analysis; D061329:Oil and Gas Fields; D018515:Plant Leaves / Q000737:chemistry / Q000502:physiology*; D058998:Remote Sensing Technology / Q000379:methods*; D017215:Satellite Communications; D012621:Seasons; D013455:Sulfur / Q000032:analysis
chemical_list: D000393:Air Pollutants; D005740:Gases; D013455:Sulfur; D009584:Nitrogen
keywords: Air quality modeling; Alberta Oil Sands Region; Dry deposition; Leaf area index