Seasonal sulfur deposition in Asia

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:466122

Arndt, R L; Carmichael, G R ^[1]

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1. Univ. of Iowa, Iowa City, IA (United States)

Seasonality plays a notable role in regional sulfur deposition patterns. Researchers in North America and Europe have noted significant variations in intra-annual deposition levels. Atmospheric transport and deposition of sulfur in Asia also exhibits strong seasonal change. Chemical, physical, and climate factors combined result in seasonal variations in both concentrations and deposition. Intra-annual changes in meteorology and precipitation patterns greatly after transport distances and deposition patterns. Much of Asia`s precipitation patterns demonstrate clear wet and dry seasons. Dry deposition rates in the northern latitudes vary as a function of the growing season. SO{sub 2} to sulfate conversion rates as well as wet scavenging rates also exhibit seasonal and latitudinal variations. Using ATMOS, a multi-dimensional, three layer Lagrangian model, monthly sulfur deposition has been calculated for Eastern Asia. This deposition has been aggregated into seasonal and annual deposition values. The impact that seasonality has on individual countries was then analyzed. Seasonal variations can alter the annual impact that an individual source`s emissions has on the region. The ATMOS output was combined to provide source-receptor relationships at the country and sub-country level. These source-receptor relationships serve to illuminate seasonal differences in deposition patterns. The change in seasonal deposition patterns and source-receptor relationships between Asian countries is presented. Additionally, monthly predicted values and their intra-annual variability is discussed.

• OSTI ID: 466122
• Report Number(s): CONF-9606185--
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
AIR POLLUTION
ASIA
DEPOSITION
ECOLOGICAL CONCENTRATION
SEASONAL VARIATIONS
SULFUR