| 巴丹吉林沙漠北缘沙尘天气过程中近地面气象要素变化及风沙流结构分析 |
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| 引用本文： | 杨帆,何清,艾力.买买提明,霍文,杨兴华,郑新倩,王毅.巴丹吉林沙漠北缘沙尘天气过程中近地面气象要素变化及风沙流结构分析[J].新疆气象,2015,9(4):67-74. |
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| 作者姓名： | 杨帆 何清 艾力.买买提明 霍文 杨兴华 郑新倩 王毅 |
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| 作者单位： | 中国气象局乌鲁木齐沙漠气象研究所,中国气象局乌鲁木齐沙漠气象研究所,中国气象局乌鲁木齐沙漠气象研究所,中国气象局乌鲁木齐沙漠气象研究所,中国气象局乌鲁木齐沙漠气象研究所,新疆农业气象台,拐子湖气象站 |
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| 基金项目： | 国家自然科学基金项目（面上项目，重点项目，重大项目）;中国沙漠气象科学研究基金 |
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| 摘 要： | 提要：利用2013年春季在巴丹吉林沙漠北缘拐子湖地区的沙尘暴加强观测资料,对比分析该地区典型流动沙面晴天、扬沙和沙尘暴三种天气背景下各气象要素的变化特征及差异,同时对沙尘暴过程中近地层风沙活动特征进行分析。结果表明,随风速增加沙尘天气强度逐步提升且沙尘天气来临前风速、风向均表现出明显的调整现象,此后爆发过程中风速、风向相对稳定。随沙尘天气强度的增加气温逐渐减小且沙尘天气过程中地面呈利于沙尘起动的暖干状态,同时地面气压不断升高。悬浮的沙尘会导致拐子湖流动沙地各层地温有减小趋势,但减小程度相对较弱,使沙尘天气下各层地温仍保持良好的梯度变化和正弦型日变化趋势。拐子湖流沙地春季起沙风速为6.5m/s,输沙通量垂直分布状况在20cm左右具有明显的分段现象。地表100cm内总输沙量的50%和90%分别集中在地表20cm和56cm高度以内。观测期间整个5月地表0～100cm高度内的输沙通量为420.96kg/m。
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| 关 键 词： | 巴丹吉林沙漠 沙尘天气 气象要素 起沙风速 风沙流结构 |
| 收稿时间： | 2014/4/25 0:00:00 |
| 修稿时间： | 2014/10/27 0:00:00 |
Impact of sand-dust weather on meteorological elements and analysis of blown-sand activites in the northern margin of the Badain Jaran desert |
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| YANG Fan,HE Qing,Ali Mamtimin,HUO Wen,YANG Xing-hu,ZHENG Xin-qian and WANG Yi.Impact of sand-dust weather on meteorological elements and analysis of blown-sand activites in the northern margin of the Badain Jaran desert[J].Bimonthly of Xinjiang Meteorology,2015,9(4):67-74. |
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| Authors: | YANG Fan HE Qing Ali Mamtimin HUO Wen YANG Xing-hu ZHENG Xin-qian and WANG Yi |
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| Institution: | Institute of Desert Meteorology,China Meteorological Administration,Institute of Desert Meteorology,China Meteorological Administration,Institute of Desert Meteorology,China Meteorological Administration,Institute of Desert Meteorology,China Meteorological Administration,Institute of Desert Meteorology,China Meteorological Administration,Xinjiang Agro-Meteorolical Observatory,Alxa League Guaizi Lake Meteorological Station |
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| Abstract: | Based on the observed data of sandstorms in spring 2013 from flux observation stations, which was built by China meteorological administration institute of desert meteorology in the northern margin of the Badain Jaran desert Guaizi lake region, we analyzed the characteristics of blown-sand activates and meteorological elements of the near surface layer under different weather conditions (clear day, blowing-sand day and sandstorm day). The results showed that: (1)The higher wind speed brought about stronger dust process. The wind speed and direction showed significant adjustment process before the dust weather, but it was relatively stable phases when it entered course of outbreak. (2) The ground temperature decreased with dust weather intensity increased. In dust weather processes, the ground showed a warm and dry state that was beneficial to the moving of sand and dust, while the air pressure was rising. (3) The floating dust resulted in each layer of soil temperature showing a decrease tendency, but the degree of reduction was relatively weak. Moreover, the each layer of soil temperature under dust weather maintained good gradient changes and showed a diurnal variation trend of sine function curve. (4) At the height of 2 m above ground surface, the instant sand-laden wind velocity for naturally mixed sands was about 6.5 m/s at one-minute interval. In the sand drift structure, the vertical sand flux was all in an increase trend with the increase of height below 20 cm from the ground. The vertical sand flux at all the height was exponent function decreased with the increase of height above 20 cm. The 50% and 90% of the total sand flux occurred mainly in air layer below 20 cm and 56 cm from the ground, respectively. The sand flux within 0 ~ 100 cm height was 420.96 kg/m during the observation period. |
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| Keywords: | Badain Jaran desert sand-dust weather meteorological elements sand-laden wind velocity sand drift structure |
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