TY - JOUR
T1 - Structure of dust and air pollutant outflow over East Asia in the spring
AU - Itahashi, Syuichi
AU - Yumimoto, Keiya
AU - Uno, Itsushi
AU - Eguchi, Kenta
AU - Takemura, Toshihiko
AU - Hara, Yukari
AU - Shimizu, Atsushi
AU - Sugimoto, Nobuo
AU - Liu, Zhaoyan
PY - 2010/10/1
Y1 - 2010/10/1
N2 - 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.
AB - 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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U2 - 10.1029/2010GL044776
DO - 10.1029/2010GL044776
M3 - Article
AN - SCOPUS:78049340010
SN - 0094-8276
VL - 37
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 20
M1 - L20806
ER -