| 21世纪初中国北方沙尘天气特征及其与地面风速和植被的关系研究 |
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| 引用本文： | 陈亿,尚可政,王式功,李艳.21世纪初中国北方沙尘天气特征及其与地面风速和植被的关系研究[J].中国沙漠,2012,32(6):1702-1709. |
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| 作者姓名： | 陈亿 尚可政 王式功 李艳 |
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| 作者单位： | 1. 兰州大学大气科学学院／半干旱气候变化教育部重点实验室,甘肃兰州730000 中国人民解放军63870部队,陕西华阴714200
2. 兰州大学大气科学学院／半干旱气候变化教育部重点实验室,甘肃兰州,730000 |
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| 基金项目： | 国家科技支撑计划项目，国家自然科学基金项目，国家行业专项，兰州大学中央高校基本科研业务费专项资金，干旱气象科学研究基金项目 |
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| 摘 要： | 利用2002—2010年气象站点观测资料,结合同期归一化植被指数(NDVI)资料,分析了中国北方地区2002—2010年的沙尘天气特征,以及沙尘天气与地面风速和NDVI的关系。结果表明,2002年和2006年是21世纪初的沙尘天气强年,中国北方的沙尘天气总站日数明显偏多;中国北方的沙尘天气与NDVI的0.2等值线位置的变化有关,当其向东进时,沙尘天气也频发,向西退时,沙尘天气也减弱;在植被很少,靠近沙漠的地区,沙尘天气日数和强风日数有很好的正相关性,在沙漠与草原的过渡地带,沙尘天气日数与NDVI有很好的负相关性;当植被指数减小,地表面植被覆盖减少,强风也增强,中国北方的沙尘天气就很可能增强。
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| 关 键 词： | 沙尘天气 强风 NDVI 中国北方 |
Characteristics of Sand-dust Weather in Northern China from 2002 to 2010and Its Relationship with Surface Wind Speed and NDVI |
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| CHEN Yi,SHANG Ke-zheng,WANG Shi-gong,Li Yan.Characteristics of Sand-dust Weather in Northern China from 2002 to 2010and Its Relationship with Surface Wind Speed and NDVI[J].Journal of Desert Research,2012,32(6):1702-1709. |
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| Authors: | CHEN Yi SHANG Ke-zheng WANG Shi-gong Li Yan |
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| Institution: | (1.Ministry of Education Key Laboratory of Semi-Arid Climate Change/School of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China;2.Unit 63870 of PLA, Huayin 714200, Shanxi, China) |
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| Abstract: | The characteristics of sand-dust weather in northern China from 2002 to 2010 were analyzed based on meteorological observation data and normalized difference vegetation index (NDVI), and the relationships between sand-dust weather and wind speed or NDVI were explored. Results show that the sand-dust weather days increased significantly in northern China in 2002 and 2006 compared with that during 2003-2005 and 2007-2010. The sand-dust weather variation was related with the change of the isoline of NDVI 0.2. When the isoline of NDVI 0.2 advanced eastward, the sand-dust weather days increased; when it retreated westward, the sand-dust weather days decreased. Sand-dust weather frequency was positively correlated with strong wind days near desert regions, and the negative correlation between the NDVI and sand-dust weather days was identified in the desert-steppe ecotone. If the strong wind frequency increases and NDVI reduces, sand-dust weather is likely to become active in northern China. |
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| Keywords: | sand-dust weather strong wind NDVI northern China |
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