Long-range transport of giant particles in Asian dust identified by physical, mineralogical, and meteorological analysis
Giant particles transported over long distances are generally of limited concern in atmospheric studies due to their low number concentrations in mineral dust and possible local origin. However, they can play an important role in regional circulation of earth materials due to their enormous volume c...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2014-01-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/14/505/2014/acp-14-505-2014.pdf |
| _version_ | 1828367108463919104 |
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| author | G. Y. Jeong J. Y. Kim J. Seo G. M. Kim H. C. Jin Y. Chun |
| author_facet | G. Y. Jeong J. Y. Kim J. Seo G. M. Kim H. C. Jin Y. Chun |
| author_sort | G. Y. Jeong |
| collection | DOAJ |
| description | Giant particles transported over long distances are generally of limited
concern in atmospheric studies due to their low number concentrations in
mineral dust and possible local origin. However, they can play an important
role in regional circulation of earth materials due to their enormous volume
concentration. Asian dust laden with giant particles was observed in Korea on
31 March 2012, after a migration of about 2000 km across the Yellow Sea from
the Gobi Desert. Scanning electron microscopy (SEM) revealed that 20% of
the particles exceeded 10 μm in equivalent sphere diameter, with a
maximum of 60 μm. The median diameter from the number distribution
was 5.7 μm, which was larger than the diameters recorded of 2.5 and
2.9 μm in Asian dust storms in 2010 and 2011, respectively, and was
consistent with independent optical particle counter data. Giant particles
(>10 μm) contributed about 89% of the volume of the
dust in the 2012 storm. Illite–smectite series clay minerals were the major
mineral group followed by quartz, plagioclase, K-feldspar, and calcite. The
total phyllosilicate content was ~52%. The direct long-range
transport of giant particles was confirmed by calcite nanofibers closely
associated with clays in a submicron scale identified by high-resolution SEM
and transmission electron microscopy. Since giant particles consisted of clay
agglomerates and clay-coated quartz, feldspars, and micas, the mineral
composition varied little throughout the fine (<5 μm),
coarse (5–10 μm), giant-S (10–20 μm), and giant-L
(>20 μm) size bins. Analysis of the synoptic
conditions of the 2012 dust event and its migration indicated that the
mid-tropospheric strong wind belt directly stretching to Korea induced rapid
transport of the dust, delivering giant particles. Giant dust particles with
high settling velocity would be the major input into the terrestrial and
marine sedimentary and ecological systems of East Asia and the western
Pacific. Analysis of ancient aeolian deposits in Korea suggested the common
deposition of giant particles from Asian dust through the late Quaternary
Period. The roles of giant particles should be reviewed with regard to
regional circulation of mineral particles and nutrients. |
| first_indexed | 2024-04-14T05:54:55Z |
| format | Article |
| id | doaj.art-21755efc58444627a930a7a236aad7ec |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-04-14T05:54:55Z |
| publishDate | 2014-01-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-21755efc58444627a930a7a236aad7ec2022-12-22T02:08:59ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242014-01-0114150552110.5194/acp-14-505-2014Long-range transport of giant particles in Asian dust identified by physical, mineralogical, and meteorological analysisG. Y. Jeong0J. Y. Kim1J. Seo2G. M. Kim3H. C. Jin4Y. Chun5Department of Earth and Environmental Sciences, Andong National University, Andong 760-749, Republic of KoreaKorea Institute of Science and Technology (KIST), Seoul 136-791, Republic of KoreaKorea Institute of Science and Technology (KIST), Seoul 136-791, Republic of KoreaDepartment of Earth and Environmental Sciences, Andong National University, Andong 760-749, Republic of KoreaKorea Institute of Science and Technology (KIST), Seoul 136-791, Republic of KoreaAsian Dust Research Division, National Institute of Meteorological Research, Seoul 156-720, Republic of KoreaGiant particles transported over long distances are generally of limited concern in atmospheric studies due to their low number concentrations in mineral dust and possible local origin. However, they can play an important role in regional circulation of earth materials due to their enormous volume concentration. Asian dust laden with giant particles was observed in Korea on 31 March 2012, after a migration of about 2000 km across the Yellow Sea from the Gobi Desert. Scanning electron microscopy (SEM) revealed that 20% of the particles exceeded 10 μm in equivalent sphere diameter, with a maximum of 60 μm. The median diameter from the number distribution was 5.7 μm, which was larger than the diameters recorded of 2.5 and 2.9 μm in Asian dust storms in 2010 and 2011, respectively, and was consistent with independent optical particle counter data. Giant particles (>10 μm) contributed about 89% of the volume of the dust in the 2012 storm. Illite–smectite series clay minerals were the major mineral group followed by quartz, plagioclase, K-feldspar, and calcite. The total phyllosilicate content was ~52%. The direct long-range transport of giant particles was confirmed by calcite nanofibers closely associated with clays in a submicron scale identified by high-resolution SEM and transmission electron microscopy. Since giant particles consisted of clay agglomerates and clay-coated quartz, feldspars, and micas, the mineral composition varied little throughout the fine (<5 μm), coarse (5–10 μm), giant-S (10–20 μm), and giant-L (>20 μm) size bins. Analysis of the synoptic conditions of the 2012 dust event and its migration indicated that the mid-tropospheric strong wind belt directly stretching to Korea induced rapid transport of the dust, delivering giant particles. Giant dust particles with high settling velocity would be the major input into the terrestrial and marine sedimentary and ecological systems of East Asia and the western Pacific. Analysis of ancient aeolian deposits in Korea suggested the common deposition of giant particles from Asian dust through the late Quaternary Period. The roles of giant particles should be reviewed with regard to regional circulation of mineral particles and nutrients.http://www.atmos-chem-phys.net/14/505/2014/acp-14-505-2014.pdf |
| spellingShingle | G. Y. Jeong J. Y. Kim J. Seo G. M. Kim H. C. Jin Y. Chun Long-range transport of giant particles in Asian dust identified by physical, mineralogical, and meteorological analysis Atmospheric Chemistry and Physics |
| title | Long-range transport of giant particles in Asian dust identified by physical, mineralogical, and meteorological analysis |
| title_full | Long-range transport of giant particles in Asian dust identified by physical, mineralogical, and meteorological analysis |
| title_fullStr | Long-range transport of giant particles in Asian dust identified by physical, mineralogical, and meteorological analysis |
| title_full_unstemmed | Long-range transport of giant particles in Asian dust identified by physical, mineralogical, and meteorological analysis |
| title_short | Long-range transport of giant particles in Asian dust identified by physical, mineralogical, and meteorological analysis |
| title_sort | long range transport of giant particles in asian dust identified by physical mineralogical and meteorological analysis |
| url | http://www.atmos-chem-phys.net/14/505/2014/acp-14-505-2014.pdf |
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