The characteristics of atmospheric aerosol at Aksu, an Asian dust-source region of north-west China: a summary of observation over three years from March 2001 to April 2004
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- YABUKI Sadayo
- RIKEN (The Institute of Physical and Chemical Research), Wako
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- MIKAMI Masao
- Meteorological Research Institute, Tsukuba
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- NAKAMURA Yuki
- Yamagata University
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- KANAYAMA Shinji
- RIKEN (The Institute of Physical and Chemical Research), Wako
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- FU Fenafu
- RIKEN (The Institute of Physical and Chemical Research), Wako The College of Chemistry and Chemical Engineering, Fuzhou University
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- LIU Mingzhe
- Xinjiang Institute of Ecology and Geography, CAS, Urumqi
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- ZHOU Hongfei
- Xinjiang Institute of Ecology and Geography, CAS, Urumqi
書誌事項
- タイトル別名
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- The Characteristics of Atmospheric Aerosol at Aksu, an Asian Dust-Source Region of North-West China: A Summary of Observations over the Three Years from March 2001 to April 2004
- Characteristics of Atmospheric Aerosol at Aksu an Asian Dust Source Region of North West China A Summary of Observations over the Three Years from March 2001 to April 2004
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説明
Aerosol sampling and meteorological observations were carried out from March 2001 to April 2004 at Aksu, in the northern part of the Taklimakan Desert in north-west China. There were three intensive observation periods (IOP): 11-24 April 2002, 16-26 March 2003 and 10-17 March 2004.<br>The observed maximum concentration of total suspended particles (TSP) was 5.2 mg m−3 during the dust event of April 2003. Variations in the TSP and PM11 (panicles smaller than 11 μm) show that high atmospheric concentrations were observed during dust events that occurred mainly in spring and summer. According to the meteorological observations, dust storms or blowing sandldust occurred not only in spring, but also in summer and autumn, though floating dust occurred mainly in March and Apri1. The frequency of dust events was consisted with the results of dry deposition.<br>During spring and summer, the size-distribution of aerosols is unimodal with a maximum in the range 3.3-7.0 μm, while in winter the size-distribution shows a bimodal pattern with two peaks; at 3.3-7.0 μm for soil particles and 0.65-1.1 μm for anthropogenic panicles. From the results of size distribution of soluble ion concentration, anthropogenic particles consist mainly of ammonium sulfate and ammonium nitrate, which result from coal combustion for heating during winter.<br>Concerning chemical composition, aerosols from Aksu contain a significant amount of evaporate minerals such as calcium carbonate (calcite), sodium chloride (halite), and calcium sulfate (gypsum and anhydrite). These evaporates are common minerals in the saline soils which are widespread around observation site, and it is suggested that they are provided into atmosphere from the ground surface together with soil particles.<br>Major element composition for aerosols in Aksu show a lower SiO2 content and higher FeO, K2O and MgO content compared with that for the saline soils (ψ < 125 μm), the loess deposits in the Tarim Basin and Central Loess Plateau, and Taklimakan Desert sands (ψ < 125 μm). This suggests that minerals rich in Fe, K and Mg, such as clay minerals and mica, come selectively from the soil surface into the atmosphere as mineral aerosols. This is because their particle size is generally smaller than that of quartz, the main constituent minerals in the soil.
収録刊行物
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- 気象集誌. 第2輯
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気象集誌. 第2輯 83A 45-72, 2005
公益社団法人 日本気象学会
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詳細情報 詳細情報について
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- CRID
- 1390282681480504704
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- NII論文ID
- 110001817416
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- NII書誌ID
- AA00702524
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- ISSN
- 21869057
- 00261165
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- NDL書誌ID
- 7317225
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- NDL-Digital
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可