Structure of dust and air pollutant outflow over East Asia in the spring

Details Structure of dust and air pollutant outflow over East Asia in the spring Structure of dust and air pollutant outflow over East Asia in the spring

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3720806i&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 20, CiteID L20806

Physics

Atmospheric Composition And Structure: Troposphere: Constituent Transport And Chemistry, Atmospheric Composition And Structure: Troposphere: Composition And Chemistry, Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906)

Scientific paper

Springtime outflow of Asian dust and air pollutants was investigated by a synergetic analysis of ground-based/space-borne Lidar observations and numerical models. We identified two prominent outflow patterns, and its occurrence frequency. Pattern I was induced within a typical warm-sector which lifted up dust particles into the free troposphere, and the existence of two sequential low-pressure systems played an important role. Pattern II was a ‘behind cold front’ outbreak. Atmospheric stratification was significantly different; Pattern I had weak stratification within the troposphere (potential temperature gradient of ˜2-3.4 K/km), and most of elevated dust layer (typically horizontally 1500-2000 km, vertically 2.5-4 km AGL) remained unmixed with pollutants. Pattern II was characterized by a strong stratification of ˜5 K/km; dust and pollutants were trapped and well mixed within the PBL, forming ‘polluted’ dust. Among the six cases of large-scale dust/pollutants outbreaks, only two cases are belonged to Pattern I.

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