甘肃省近30年沙尘暴、扬沙、浮尘天气空间分布特征  

Spatial Distribution of Dust Storm, Fly Sand and Floating Dust Over Last Thirty Years in Gansu Province

作　　者：张存杰[1] 宁惠芳[2] 

机构地区：[1]兰州干旱气象研究所,兰州730020 [2]兰州中心气象台

出　　处：《气象》2002年第3期28-32,共5页Meteorological Monthly

摘　　要：通过对甘肃省 1 971～ 2 0 0 0年共 3 0年沙尘暴、扬沙、浮尘天气发生日数的分析 ,给出了年平均和四季的空间分布特征 ,并分析了沙尘天气形成的原因。分析发现 ,从武威开始 ,经景泰、白银、会宁到天水、徽县存在一个沙舌区 ,是浮尘天气的多发区。该沙舌与甘肃中部至陇南的干舌基本吻合 ,与青藏高原东北边缘的地形走向基本一致。该沙舌的存在是甘肃省中东部生态环境脆弱、荒漠化进一步发展的重要因素。The mean annual and season spatial distributions of dust storm, fly sand, floating dust are given by using observations from 1970 to 2000. The reasons of causing the dust weather are analyzed. It is found that there was a dust strip passing from Wuwei via Jingtai and Baiyin and Huining to Tianshui and Huixian, the floating dust weather occurred frequently over there. The dust strip was consistent with the rainless strip from middle to south of Gansu Province, and with the lay of the land of northeast of Qinghai-Xizang Plateau. The dust strip is one of the reasons of desert area extending in middle and south of Gansu.

关 键 词：沙尘暴 扬沙 浮尘 空间分布 甘肃 生态环境 

分 类 号：P425.55[天文地球—大气科学及气象学]