干旱区生态环境知识资源中心(Arid): 民勤沙尘源区近地面降尘特征研究

Arid

	民勤沙尘源区近地面降尘特征研究
其他题名	Study On Character of Dustfull near the Ground in Minqin Dust Source Regions
	张锦春; 赵明; 方峨天; 詹科杰; 杨自辉; 张应昌; 郭树江
ISSN	1001-6929
出版年	2008
卷号	21 期号:3 页码:17-21
中文摘要	借助近地面沙尘暴监测系统进行沙尘暴监测,分析民勤沙尘源区近地面降尘分布特征.结果表明:民勤降尘量与沙尘天气发生频率密切相关,春季3,4月沙尘高发期月降尘量分别为9.0和9.5 mg/cm~2.降尘随距地面高度的增加而减小,最大降尘出现在近地面1 m处,月降尘量为9.7 mg/cm~2;降尘受下垫面条件影响较大.从荒漠区到绿洲边缘,风速减弱4.11%,总降尘量由25.0 mg/cm~2减少到20.6 mg/cm~2;绿洲内部受防护林作用,风速减弱30.45%,总降尘量增到24.6mg/cm~2,最大降尘量提高到近地面9 m处,与绿洲防护林冠层平均高度相吻合.风速对近地面20 m内的降尘影响明显,平均降尘量2.5 mg/cm~2.距地面9 m的高度范围内,降尘随持续时间变化迅速增加,降尘增量可达3.1 mg/cm~2.
英文摘要	A near ground sandstorm observation system was used to monitor the sandstorms and analyze the character of dustfall near the ground in Minqin dust source regions.The results show that the dustfall in Minqin has the same frequency as dust events,and the monthly dustfall intensity is(9.0) and(9.5)(mg/cm~2) respectively in March and April which are the two months with highest occurrences of dust events.The quantity of dustfall decreases with the height,and the maxim dustfall appears at 1 m near ground,with the monthly value of(9.7)(mg/cm~2).The condition of underlying surface significantly affects the dustfall,from the desert to the oasis edge,the wind speed weakens by(4.11%) and the total dustfall decreases from(25.0)(mg/cm~2) to(20.6)(mg/cm~2).Within the oasis,the wind speed weakens by(30.45%),the total dustfall increases to(24.6)(mg/cm~2) due to protection of defense forest,and maximum dustfall enhances to the height of 9 m,inosculating with the height of average coronal layer of oasis defense forest.It is evident that the wind speed affects the dustfall near the surface of 20 m heights,with the average dustfall of(2.5)(mg/cm~2).The dustfall rapidly increases with duration time of dust and sand,and the increment of dustfall can reach(3.1)(mg/cm~2) within the height of 9 m.
中文关键词	近地面 ; 沙尘观测系统 ; 沙尘源区 ; 降尘特征 ; 下垫面 ; 风速 ; 民勤
英文关键词	near ground sandstorm observation system dust source regions character of dustfall underlying surface wind speed Minqin
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ENVIRONMENTAL SCIENCES
WOS研究方向	Environmental Sciences & Ecology
CSCD记录号	CSCD:3267247
来源机构	甘肃省治沙研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/222530
作者单位	甘肃省治沙研究所甘肃民勤荒漠草地生态系统国家野外科学观测研究站, 甘肃省荒漠化防治重点实验室, 武威, 甘肃 733000, 中国
推荐引用方式 GB/T 7714	张锦春,赵明,方峨天,等. 民勤沙尘源区近地面降尘特征研究[J]. 甘肃省治沙研究所,2008,21(3):17-21.
APA	张锦春.,赵明.,方峨天.,詹科杰.,杨自辉.,...&郭树江.(2008).民勤沙尘源区近地面降尘特征研究.,21(3),17-21.
MLA	张锦春,et al."民勤沙尘源区近地面降尘特征研究".21.3(2008):17-21.