Measurement of saltation process over gobi and sand dunes in the Taklimakan desert, China, with newly developed sand particle counter

CORC > 新疆生态与地理研究所 > 中国科学院新疆生态与地理研究所 > 中国科学院新疆生态与地理研究所(2010年以前数据)

	Measurement of saltation process over gobi and sand dunes in the Taklimakan desert, China, with newly developed sand particle counter
	Mikami ; M ; Yamada ; Y ; Ishizuka ; Ishimaru ; T ; Gao ; WD ; Zeng ; FJ
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
	2005
卷号	110 期号:D18 页码:D18S02
关键词	SEDIMENT TRANSPORT WIND DUST ENTRAINMENT VELOCITY
ISSN号	0148-0227
通讯作者	Mikami, M, Meteorol Res Inst, Nagamine 1-1, Tsukuba, Ibaraki 3050052, Japan
中文摘要	The Japan-Sino joint project, Aeolian Dust Experiment on Climate impact (ADEC), was initiated in April 2000 in order to understand the aeolian dust impact on climate via radiative forcing. As a part of the ADEC project, we have conducted field research in a sand dune and a gobi (i.e., a desert in which the soil surface consists of sand and pebbles with flat surfaces) in the south of the Taklimakan desert, China. The purpose of this study is to understand the wind erosion process and its relation to the meteorological and soil physical parameters. For this purpose, we measured the vertical profiles of wind speed, air temperature, and humidity as well as the other meteorological elements using an automatic weather station. A new sand particle counter (SPC) was newly developed to measure the saltation process. The SPC detects a signal change when a saltation particle passes through the slit between the laser beam transmitter and receiver. From this signal change, we can measure saltation particles from 30 to 667 mm diameter with 32 bin classes and particle numbers of each bin class every second. We have operated this SPC in the field, and it proved to be useful for the saltation process study when data corrections and calibration were properly made. During the observation period (1-21 April 2002), a total of eight dust events occurred; we analyzed two events: 5 April and 14 April cases. The results can be summarized as follows: (1) Total saltation fluxes in the 5 April case from 1223 to 1430 UT were 37.93 kg m(-2) at 30 cm height and 43.71 kg m(-2) at 20 cm height for the gobi site and 2.61 kg m(-2) at 30 cm height for the dune site. (2) In the 14 April case, from 0327 to 0830 UT, the total saltation flux was 8.95 kg m(-2) at 30 cm height for the gobi site. (3) Saltation flux at the gobi site in the 5 April case was more than 10 times larger than that of the sand dune, though the distance between the sites is 4 km. This is because the number of the parent soil particles around 80 mm at the gobi site was more than 10 times greater than that of the dune site. (4) Height dependency of saltation particle size and number was found in the gobi site; that is, the particle size distributions at the gobi sites in the 5 April case indicated that the number size distribution of the coarse particles, 117 to 554 mm, at 20 cm height was greater than that at 30 cm height. This size-height dependency was reasonable from a physical point of view. However, present theory cannot explain this well.
学科主题	自然地理学
收录类别	SCI
公开日期	2011-08-19
内容类型	期刊论文
源URL	[http://ir.xjlas.org/handle/365004/10526]
专题	新疆生态与地理研究所_中国科学院新疆生态与地理研究所(2010年以前数据)
推荐引用方式 GB/T 7714	Mikami,M,Yamada,et al. Measurement of saltation process over gobi and sand dunes in the Taklimakan desert, China, with newly developed sand particle counter[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2005,110(D18):D18S02.
APA	Mikami.,M.,Yamada.,Y.,Ishizuka.,...&FJ.(2005).Measurement of saltation process over gobi and sand dunes in the Taklimakan desert, China, with newly developed sand particle counter.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,110(D18),D18S02.
MLA	Mikami,et al."Measurement of saltation process over gobi and sand dunes in the Taklimakan desert, China, with newly developed sand particle counter".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 110.D18(2005):D18S02.