Application of photochemical models. Volume III. Recent sensitivity tests and other applications of the LIRAQ model. Final report

Technical Report · Sat Dec 01 04:00:00 EST 1979

OSTI ID:6367908

Wada, R Y; Wong, M J; Leone, E Y; Robinson, L H; DeMandel, R E

A series of photochemical modeling experiments, using the LIRAQ model applied to the San Francisco Bay Area, was performed to investigate: (1) model sensitivity to the spatial resolution of the gridded emissions, (2) the impact of future HC and NO controls on the future Bay Area NO2 levels, and (3) the future impact of Bay Area HC and NO reductions on O3 in adjacent downwind valleys. The emission resolution experiments consisted of three simulations wherein emissions were smoothed over (1) 5 x 5 km areas, (2) 10 x 10 km areas, and (3) distributed according to population. Changing from 5 km to 10 km resolution changed the O3 maximum concentration by up to 10%. When emissions were distributed proportional to population substantial changes occurred in the timing and magnitude of the O3 maxima. The short-term NO2 experiments consisted of simulating O3 and NO2 fields under meteorological conditions favoring high NO2 buildups. Sensitivity runs were made which suggest that HC control is the most effective strategy for both O3 and NO2. The long range transport experiments consisted of modifying LIRAQ to simulate an expanded 160 x 160 km region that included portions of the Sacramento and San Joaquin Valleys as a 'receptor' region. The results showed that for the prototype day used, downwind O3 was more strongly influenced by initial and boundary conditions than by Bay Area emissions changes.

• Research Organization: Association of Bay Area Governments, Berkeley, CA (USA)
• OSTI ID: 6367908
• Report Number(s): PB-81-112898
• Country of Publication: United States
• Language: English

Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION
AIR POLLUTION CONTROL
ATMOSPHERIC CHEMISTRY
CHALCOGENIDES
CHEMISTRY
COMBUSTION PRODUCTS
CONTROL
ENVIRONMENTAL TRANSPORT
EXHAUST GASES
FLUIDS
FORECASTING
GASEOUS WASTES
GASES
HYDROCARBONS
INDUSTRIAL WASTES
MASS TRANSFER
MATHEMATICAL MODELS
NITROGEN COMPOUNDS
NITROGEN OXIDES
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
OZONE
PACIFIC OCEAN
PHOTOCHEMICAL OXIDANTS
PHOTOCHEMISTRY
POLLUTION
POLLUTION CONTROL
SAN FRANCISCO BAY
SEAS
SURFACE WATERS
WASTES