CALMET/CALPUFF modeling of nitrogen deposition to Sarasota Bay, Florida
The dispersion, transport, chemical transformation and deposition of southern Florida nitrogen oxide emissions were modeled using CALMET/CALPUFF to estimate nitrogen deposition to Sarasota Bay. The domain modeled was 390 km x 400 km with a 10-km grid size, and included emissions from the metropolitan areas of Tampa Bay, Orlando, Miami, and Ft. Myers. Utility emissions were modeled as 67 point sources (150,000 metric tons/year), industrial emissions as 90 point sources (18,000 metric tons/year), and combined mobile and area sources as 13 volume and 20 line sources (320,000 metric tons/year). CALMET/CALPUFF modeling was done month-by-month, and each source category was modeled separately. Annually averaged ambient air concentrations predicted over Sarasota Bay for NO{sub x}, HNO{sub 3} and NO{sub 3} were 9 {micro}g m{sup {minus}3}, 1 {micro}g m{sup {minus}3}, and 0.7 {micro}g m{sup {minus}3}, respectively. Mobile plus area sources contributed 86%, 69% and 78% to the average annual ambient air NO{sub x}, HNO{sub 3} and NO{sub 3} concentrations, respectively. The total predicted nitrogen deposition to Sarasota Bay from these species was 23 metric tons/year, and this represents a deposition rate of 1.8 kg-N/ha/year. Of this total predicted nitrogen deposition, 11% was from wet deposition and 89% from dry deposition. Mobile and area sources accounted for 80%, utility sources 16% and industrial sources 4%, of the total nitrogen deposition. By species, NO{sub x} contributed 69%, HNO{sub 3} 29%, and NO{sub 3} 2%, to the total nitrogen deposited. The modeled wet deposition rate of 0.2 kg-N/ha/year is well below the 1.9 kg-N/ha/year NO{sub 3} wet deposition rate measured in 1990 at a National Atmospheric Deposition Program site in Sarasota County.
- Research Organization:
- Environmental Technologies Group, Inc., Tampa, FL (US)
- OSTI ID:
- 20002131
- Report Number(s):
- CONF-990608-; TRN: IM200002%%131
- Resource Relation:
- Conference: Air and Waste 92nd Annual Meeting and Exhibition, St. Louis, MO (US), 06/20/1999--06/24/1999; Other Information: 1 CD-ROM. Operating Systems: Windows 3.1, '95, '98 and NT; Macintosh; and UNIX; PBD: 1999; Related Information: In: Air and Waste 92nd annual meeting and exhibition proceedings, [9500] pages.
- Country of Publication:
- United States
- Language:
- English
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