A12E-06
HONO and Inorganic Fine Particle Composition in Typical Monsoon Region with Intensive Anthropogenic Emission: In-situ Observations and Source Identification.
HONO and Inorganic Fine Particle Composition in Typical Monsoon Region with Intensive Anthropogenic Emission: In-situ Observations and Source Identification.
Monday, 14 December 2015: 11:50
3004 (Moscone West)
Abstract:
Yangtze River Delta (YRD) is one of the most typical monsoon area with probably the most largest population intensity in the world. With sharply economic development and
the large anthropogenic emissions, fine particle pollution have been one of the major air
quality problem and may further have impact on the climate system. Though a lot of control
policy (sulfur emission have been decreasing from 2007) have been conducted in the region,
studies showed the sulfate in fine particles still take major fraction as the nitrate from nitrogen
oxides increased significantly. In this study, the role of inorganic chemical compositions in fine
particles was investigated with two years in-situ observation. Sulfate and Nitrate contribute to
fine particle mass equally in general, but sulfate contributes more during summer and nitrate
played more important role in winter. Using lagrangian dispersion backward modeling and
source contribution clustering method, the impact of airmass coming from different source
region (industrial, dust, biogenic emissions, etc) on fine particle inorganic compositions were
discussed. Furthermore, we found two unique cases showing in-situ implications for sulfate
formation by nitrogen dioxide oxidation mechanisms. It was showed that the mixing of
anthropogenic pollutants with long-range transported mineral dust and biomass burning plume
would enhance the sulfate formation by different chemistry mechanisms. This study focus on the
complex aspects of fine particle formation in airmasses from different source regions: . It highlights
the effect of NOx in enhancing the atmospheric oxidization capacity and indicates a potentially
very important impact of increasing NOx on air pollution formation and regional climate change
in East Asia.