| Seasonal Variations in Dustfall and Its Iron Content over North China |
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| 作者姓名： | 李晋昌 董治宝 王训明 钱广强 罗万银 |
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| 作者单位： | Key Laboratory of Desert and Desertification Cold and Arid Regions Environmental and Engineering Research Institute，Chinese Academy of Sciences，Lanzhou 730000，Key Laboratory of Desert and Desertification，Cold and Arid Regions Environmental and Engineering Research Institute，Chinese Academy of Sciences，Lanzhou 730000，Key Laboratory of Desert and Desertification，Cold and Arid Regions Environmental and Engineering Research Institute，Chinese Academy of Sciences，Lanzhou 730000，Key Laboratory of Desert and Desertification，Cold and Arid Regions Environmental and Engineering Research Institute，Chinese Academy of Sciences，Lanzhou 730000，Key Laboratory of Desert and Desertification，Cold and Arid Regions Environmental and Engineering Research Institute，Chinese Academy of Sciences，Lanzhou 730000 |
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| 基金项目： | This work was supported by the Knowledge Innovation Project of the Chinese Academy of Sciences"Dust Emissions and its Relations with Environmental Changes"(KZCX3-SW-341),and by the Knowledge Innovation Project of CAREERI. |
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| 摘 要： | Extensive dustfall collections were carried out from April 2001 to May 2002 in North China. The highest level of dustfall occurred in the Gobi deserts and at the margins of sandy deserts in the region. The iron content in dustfall in North China varied from 0.6% to 6.0% and there was significant seasonal variation, which indicates the dust sources differed during the year. Although the iron content in dustfall in North China is higher in the Loess Plateau and arable lands and lower in the Gobi and sandy deserts, the total iron deposition was higher in the Gobi desert regions. If the fine particles （PM10） in dustfall in North China are the major contributors of dust transport to eastern China and western parts of the North Pacific, then the annual deposition rates of iron may have been underestimated in previous studies. Our analysis indicates that iron deposition may reach 1.38 × 10^3 to 2.43 × 10^3 kg km^-2 and that most iron deposition occurs in spring and summer. If the more-coarse fractions （PM50） are considered, deposition rates may reach 2.75 × 10^3 and 6.80 × 10^3 kg km^-2, which would represent a large source of iron deposition in eastern China and the western North Pacific.
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| 关 键 词： | 中国 北方地区 季节 粉尘暴 |
| 收稿时间： | 18 November 2008 |
Seasonal variations in Dustfall and its iron content over North China |
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| Jinchang Li,Zhibao Dong,Xunming Wang,Guangqiang Qian,Wanyin Luo.Seasonal Variations in Dustfall and Its Iron Content over North China[J].Advances in Atmospheric Sciences,2008,25(3):467-473. |
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| Authors: | Jinchang Li Zhibao Dong Xunming Wang Guangqiang Qian Wanyin Luo |
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| Institution: | Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000 |
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| Abstract: | Extensive dustfall collections were carried out from April 2001 to May 2002 in North China. The highest level of dustfall occurred in the Gobi deserts and at the margins of sandy deserts in the region. The iron content in dustfall in North China varied from 0.6% to 6.0% and there was significant seasonal variation, which indicates the dust sources differed during the year. Although the iron content in dustfall in North China is higher in the Loess Plateau and arable lands and lower in the Gobi.and sandy deserts, the total iron deposition was higher in the Gobi desert regions. If the fine particles (PMio) in dustfall in North China are the major contributors of dust transport to eastern China and western parts of the North Pacific, then the annual deposition rates of iron may have been underestimated in previous studies. Our analysis indicates that iron deposition may reach 1.38 × 103 to 2.43 × 103 kg km-2 and that most iron deposition occurs in spring and summer. If the more-coarse fractions (PM50) are considered, deposition rates may reach 2.75 × 103 and 6.80 × 103 kg km-2, which would represent a large source of iron deposition in eastern China and the western North Pacific. |
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| Keywords: | Asian dust iron deposition dust emission dust sources |
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