scholarly journals Model study on particle size segregation and deposition during Asian dust events in March 2002

2004 ◽  
Vol 109 (D19) ◽  
Author(s):  
Zhiwei Han
Keyword(s):  
Particle Size ◽  
Asian Dust ◽  
Size Segregation ◽  
Model Study ◽  
Dust Events

scholarly journals Size-resolved atmospheric ice-nucleating particles during East Asian dust events

2021 ◽  
Vol 21 (5) ◽  
pp. 3491-3506
Author(s):  
Jingchuan Chen ◽  
Zhijun Wu ◽  
Jie Chen ◽  
Naama Reicher ◽  
Xin Fang ◽  
...  
Keyword(s):  
Particle Size ◽  
Mineral Dust ◽  
East Asian ◽  
Substantial Effect ◽  
Ice Nucleation ◽  
Asian Dust ◽  
Dust Particles ◽  
Significant Difference ◽  
Dust Events ◽  
Surface Ice

Abstract. Asian dust is an important source of atmospheric ice-nucleating particles (INPs). However, the freezing activity of airborne Asian dust, especially its sensitivity to particle size, is poorly understood. In this study we report the first INP measurement of size-resolved airborne mineral dust collected during East Asian dust events. The measured total INP concentrations in the immersion mode ranged from 10−2 to 102 L−1 in dust events at temperatures between −25 and −5 ∘C. The average contributions of heat-sensitive INPs at three temperatures, −10, −15, and −20 ∘C, were 81±12 %, 70±15 %, and 38±21 %, respectively, suggesting that proteinaceous biological materials have a substantial effect on the ice nucleation properties of Asian airborne mineral dust at high temperatures. The dust particles which originated from China's northwest deserts are more efficient INPs compared to those from northern regions. In general, there was no significant difference in the ice nucleation properties between East Asian dust particles and other regions in the world. An explicit size dependence of both INP concentration and surface ice-active-site density was observed. The nucleation efficiency of dust particles increased with increasing particle size, while the INP concentration first increased rapidly and then leveled, due to the significant decrease in the number concentration of larger particles. A new set of parameterizations for INP activity based on size-resolved nucleation properties of Asian mineral dust particles were developed over an extended temperature range (−35 to −6 ∘C). These size-dependent parameterizations require only particle size distribution as input and can be easily applied in models.

scholarly journals Size-Resolved Atmospheric Ice Nucleating Particles during East Asian Dust Events

2020 ◽  
Author(s):  
Jingchuan Chen ◽  
Zhijun Wu ◽  
Jie Chen ◽  
Naama Reicher ◽  
Xin Fang ◽  
...  
Keyword(s):  
Particle Size ◽  
Mineral Dust ◽  
East Asian ◽  
Substantial Effect ◽  
Ice Nucleation ◽  
Asian Dust ◽  
Dust Particles ◽  
Significant Difference ◽  
Dust Events ◽  
Surface Ice

Abstract. Asian dust is an important source of atmospheric ice nucleating particles (INPs). However, the freezing activity of airborne Asian dust, especially its sensitivity to particle size, is poorly understood. In this study we report the first INP measurement of size-resolved airborne mineral dust collected during East Asian dust events. The measured total INP concentrations in the immersion mode ranged from 10−2 to 102 L−1 in dust events at temperatures between −25 and −5 °C. The average contributions of heat-sensitive INPs at three temperatures, −10, −15, and −20 °C, were 81 ± 12 %, 70 ± 15 %, and 38 ± 21 %, respectively, suggesting that proteinaceous biological materials have a substantial effect on the ice nucleation properties of Asian atmospheric mineral dust at warm temperatures. The dust particles which originated from China's northwest deserts are more efficient INPs compared to those from northern regions. There was no significant difference in the ice nucleation properties between East Asian dust particles and other regions in the world. An explicit size dependence of both INP concentration and surface ice active density was observed. The nucleation efficiency of dust particles increased with increasing particle size, while the INP concentration first increased rapidly and then levelled, due to the significant decrease in the number concentration of larger particles. A new set of parameterizations for INP activity based on size-resolved nucleation properties of Asian mineral dust particles were developed over an extended temperature range (−35 ~ −6 °C). These size-dependent parameterizations require only particle size distributions as input, and can be easily applied in models.

Investigation of airborne lead concentrations in relation to Asian Dust events and air mass transport pathways

2006 ◽  
Vol 37 (12) ◽  
pp. 1809-1825 ◽  
Author(s):  
Ki-Hyun Kim ◽  
Chang-Hee Kang ◽  
Jin-Hong Lee ◽  
Kum-Chan Choi ◽  
Yong-Hoon Youn ◽  
...  
Keyword(s):  
Mass Transport ◽  
Asian Dust ◽  
Transport Pathways ◽  
Air Mass ◽  
Dust Events ◽  
Airborne Lead

Effects of Asian dust events on daily asthma patients in Seoul, Korea

2013 ◽  
Vol 21 (2) ◽  
pp. 202-209 ◽  
Author(s):  
Joong-Woo Lee ◽  
Ki-Kwang Lee
Keyword(s):  
Asian Dust ◽  
Asthma Patients ◽  
Dust Events

Shear-induced particle size segregation in composite powder transfer films

2014 ◽  
Vol 264 ◽  
pp. 133-139 ◽  
Author(s):  
Patrick S.M. Dougherty ◽  
Martin C. Marinack ◽  
Cecily M. Sunday ◽  
C. Fred Higgs
Keyword(s):  
Particle Size ◽  
Composite Powder ◽  
Size Segregation ◽  
Transfer Films

scholarly journals Validation of Particle Size Segregation of Sintered Ore during Flowing through Laboratory-scale Chute by Discrete Element Method

2008 ◽  
Vol 48 (12) ◽  
pp. 1696-1703 ◽  
Author(s):  
Hiroshi Mio ◽  
Satoshi Komatsuki ◽  
Masatoshi Akashi ◽  
Atsuko Shimosaka ◽  
Yoshiyuki Shirakawa ◽  
...  
Keyword(s):  
Particle Size ◽  
Discrete Element Method ◽  
Discrete Element ◽  
Laboratory Scale ◽  
Size Segregation ◽  
Element Method
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