Mixture state and size of Asian dust particles collected at southwestern Japan in spring 2000

2003 ◽  
Vol 108 (D24) ◽  
pp. n/a-n/a ◽  
Author(s):  
Daizhou Zhang ◽  
Yasunobu Iwasaka ◽  
Guangyu Shi ◽  
Jiaye Zang ◽  
Atsushi Matsuki ◽  
...  
Keyword(s):  
Asian Dust ◽  
Dust Particles ◽  
Mixture State

scholarly journals Mixture state of individual Asian dust particles at a coastal site of Qingdao, China

2003 ◽  
Vol 37 (28) ◽  
pp. 3895-3901 ◽  
Author(s):  
Daizhou Zhang ◽  
Jiaye Zang ◽  
Guangyu Shi ◽  
Yasunobu Iwasaka ◽  
Atsushi Matsuki ◽  
...  
Keyword(s):  
Asian Dust ◽  
Dust Particles ◽  
Coastal Site ◽  
Mixture State

scholarly journals Dust vertical profile impact on global radiative forcing estimation using a coupled chemical-transport–radiative-transfer model

2013 ◽  
Vol 13 (14) ◽  
pp. 7097-7114 ◽  
Author(s):  
L. Zhang ◽  
Q. B. Li ◽  
Y. Gu ◽  
K. N. Liou ◽  
B. Meland
Keyword(s):  
Heating Rate ◽  
Vertical Profile ◽  
Radiative Forcing ◽  
Asian Dust ◽  
Dust Particles ◽  
Radiative Transfer Model ◽  
Transfer Model ◽  
Vertical Profiles ◽  
Dust Source ◽  
Source Regions

Abstract. Atmospheric mineral dust particles exert significant direct radiative forcings and are important drivers of climate and climate change. We used the GEOS-Chem global three-dimensional chemical transport model (CTM) coupled with the Fu-Liou-Gu (FLG) radiative transfer model (RTM) to investigate the dust radiative forcing and heating rate based on different vertical profiles for April 2006. We attempt to actually quantify the sensitivities of radiative forcing to dust vertical profiles, especially the discrepancies between using realistic and climatological vertical profiles. In these calculations, dust emissions were constrained by observations of aerosol optical depth (AOD). The coupled calculations utilizing a more realistic dust vertical profile simulated by GEOS-Chem minimize the physical inconsistencies between 3-D CTM aerosol fields and the RTM. The use of GEOS-Chem simulated vertical profile of dust extinction, as opposed to the FLG prescribed vertical profile, leads to greater and more spatially heterogeneous changes in the estimated radiative forcing and heating rate produced by dust. Both changes can be attributed to a different vertical structure between dust and non-dust source regions. Values of the dust vertically resolved AOD per grid level (VRAOD) are much larger in the middle troposphere, though smaller at the surface when the GEOS-Chem simulated vertical profile is used, which leads to a much stronger heating rate in the middle troposphere. Compared to the FLG vertical profile, the use of GEOS-Chem vertical profile reduces the solar radiative forcing at the top of atmosphere (TOA) by approximately 0.2–0.25 W m−2 over the African and Asian dust source regions. While the Infrared (IR) radiative forcing decreases 0.2 W m−2 over African dust belt, it increases 0.06 W m−2 over the Asian dust belt when the GEOS-Chem vertical profile is used. Differences in the solar radiative forcing at the surface between the use of the GEOS-Chem and FLG vertical profiles are most significant over the Gobi desert with a value of about 1.1 W m−2. The radiative forcing effect of dust particles is more pronounced at the surface over the Sahara and Gobi deserts by using FLG vertical profile, while it is less significant over the downwind area of Eastern Asia.

Modification of Asian-dust particles transported by different routes – A case study

2014 ◽  
Vol 97 ◽  
pp. 435-446 ◽  
Author(s):  
Yuji Zaizen ◽  
Hiroaki Naoe ◽  
Hiroshi Takahashi ◽  
Kikuo Okada
Keyword(s):  
Asian Dust ◽  
Dust Particles

scholarly journals Observation of chemical modification of Asian Dust particles during long-range transport by the combined use of quantitative ED-EPMA and ATR-FT-IR imaging

2012 ◽  
Vol 12 (10) ◽  
pp. 27297-27331 ◽  
Author(s):  
Young-Chul Song ◽  
Hyo-Jin Eom ◽  
Hae-Jin Jung ◽  
Md Abdul Malek ◽  
HyeKyeong Kim ◽  
...  
Keyword(s):  
Chemical Modification ◽  
Analytical Techniques ◽  
Asian Dust ◽  
Sea Salt ◽  
Dust Particles ◽  
Long Range Transport ◽  
Combined Use ◽  
Range Transport ◽  
Ft Ir ◽  
Individual Particles

Abstract. In our previous works, it was demonstrated that the combined use of quantitative energy-dispersive electron probe X-ray microanalysis (ED-EPMA), which is also known as low-Z particle EPMA, and attenuated total reflectance FT-IR (ATR-FT-IR) imaging has great potential for a detailed characterization of individual aerosol particles. In this study, individual Asian Dust particles collected during an Asian Dust storm event on 11 November 2011 in Korea were characterized by the combined use of low-Z particle EPMA and ATR-FT-IR imaging. The combined use of the two single-particle analytical techniques on the same individual particles showed that Asian Dust particles had experienced extensive chemical modification during long-range transport. Overall, 109 individual particles were classified into four particle types based on their morphology, elemental concentrations, and molecular species and/or functional groups of individual particles available from the two analytical techniques: Ca-containing (38%); NaNO3-containing (30%); silicate (22%); and miscellaneous particles (10%). Among the 41 Ca-containing particles, 10, 8, and 14 particles contained nitrate, sulfate, and both, respectively, whereas only two particles contained unreacted CaCO3. Airborne amorphous calcium carbonate (ACC) particles were observed in this Asian Dust sample for the first time, where their IR peaks for the insufficient symmetric environment of CO32− ions of ACC were clearly differentiated from those of crystalline CaCO3. This paper also reports the field observations of CaCl2 particles converted from CaCO3 for the Asian Dust sample collected in the planetary boundary layer. Thirty three particles contained NaNO3, which are the reaction products of sea-salt and NOx/HNO3, whereas no genuine sea-salt particles were encountered, indicating that sea-salt particles are more reactive than CaCO3 particles. Some silicate particles were observed to contain nitrate, sulfate, and water. Among 24 silicate particles, 10 particles contained water, the presence of which could facilitate atmospheric heterogeneous reactions of silicate particles including swelling minerals, such as montmorillonite and vermiculite, and non-swelling ones, such as feldspar and quartz. This paper provides detailed information on the physicochemical characteristics of individual Asian Dust particles that experienced extensive chemical modification during long-range transport through the combined use of the two single-particle analytical techniques.

scholarly journals Chemical Properties of the Individual Asian Dust Particles Clarified by Micro-PIXE Analytical System

2014 ◽  
Vol 8 (3) ◽  
pp. 154-161 ◽  
Author(s):  
Chang-Jin Ma ◽  
Gong-Unn Kang ◽  
Mikio Kasahara ◽  
Susumu Tohno
Keyword(s):  
Chemical Properties ◽  
Asian Dust ◽  
Dust Particles ◽  
Analytical System ◽  
The Individual

Reactive iron isotope signatures of the East Asian dust particles: Implications for iron cycling in the deep North Pacific

2020 ◽  
Vol 531 ◽  
pp. 119342 ◽  
Author(s):  
Tianyu Chen ◽  
Weiqiang Li ◽  
Bai Guo ◽  
Ruolin Liu ◽  
Gaojun Li ◽  
...  
Keyword(s):  
North Pacific ◽  
East Asian ◽  
Asian Dust ◽  
Dust Particles ◽  
Iron Isotope ◽  
Iron Cycling ◽  
Reactive Iron
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