Arid
DOI10.1029/2003JD004270
A study of long-term trends in mineral dust aerosol distributions in Asia using a general circulation model
Mukai, M; Nakajima, T; Takemura, T
通讯作者Mukai, M
来源期刊JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
ISSN2169-897X
EISSN2169-8996
出版年2004
卷号109期号:D19
英文摘要

Dust events have been observed in Japan with high frequency since 2000. On the other hand, the frequency of dust storms is said to have decreased in the desert regions of China since about the middle of the 1970s. This study simulates dust storms and transportation of mineral dust aerosols in the east Asia region from 1981 to 2001 using an aerosol transport model, Spectral Radiation-Transport Model for Aerosol Species (SPRINTARS), implemented in the Center for Climate System Research/National Institute for Environmental Studies atmospheric global circulation model, in order to investigate the main factors that control a dust event and its long-term variation. The model was forced to simulate a real atmospheric condition by a nudging technique using European Centre for Medium-Range Weather Forecasts reanalysis data on wind velocities, temperature, specific humidity, soil wetness, and snow depth. From a comparison between the long-term change in the dust emission and model parameters, it is found that the wind speed near the surface level had a significant influence on the dust emission, and snow is also an important factor in the early spring dust emission. The simulated results suggested that dust emissions from northeast China have a great impact on dust mass concentration in downwind regions, such as the cities of northeastern China, Korea, and Japan. When the frequency of dust events was high in Japan, a low-pressure system tended to develop over the northeast China region that caused strong winds. From 2000 to 2001 the simulated dust emission flux decreased in the Taklimakan desert and the northwestern part of China, while it increased in the Gobi desert and the northeastern part of China. Consequently, dust particles seem to be transported more from the latter region by prevailing westerlies in the springtime to downwind areas as actually observed. In spite of the similarity, however, there is still a large disagreement between observed and simulated dust frequencies and concentrations. A more realistic land surface and uplift mechanism of dust particles should be modeled to improve the model simulation. Desertification of the northeastern China region may be another reason for this disagreement.


英文关键词dust Asia aerosol
类型Article
语种英语
国家Japan
收录类别SCI-E
WOS记录号WOS:000224430000002
WOS关键词CHINA ; SIMULATION ; TRANSPORT ; CLIMATE ; EROSION ; REGION
WOS类目Meteorology & Atmospheric Sciences
WOS研究方向Meteorology & Atmospheric Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/147375
作者单位(1)Univ Tokyo, Ctr Climate Syst Res, Meguro Ku, Tokyo 1538904, Japan;(2)Kyushu Univ, Appl Mech Res Inst, Fukuoka 8168580, Japan
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GB/T 7714
Mukai, M,Nakajima, T,Takemura, T. A study of long-term trends in mineral dust aerosol distributions in Asia using a general circulation model[J],2004,109(D19).
APA Mukai, M,Nakajima, T,&Takemura, T.(2004).A study of long-term trends in mineral dust aerosol distributions in Asia using a general circulation model.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,109(D19).
MLA Mukai, M,et al."A study of long-term trends in mineral dust aerosol distributions in Asia using a general circulation model".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 109.D19(2004).
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