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在观测质量控制下戈壁下垫面的湍流输送特征

, PP. 1068-1078

Keywords: 戈壁下垫面,湍流输送,地表粗糙度,质量控制

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Abstract:

?利用敦煌地区戈壁下垫面2004年6月的原始湍流观测资料,评价了该站动量和感热通量的质量空间分布,在通量资料的质量控制下,初步确定了戈壁下垫面的湍流输送特征.湍流通量的质量评价显示,动量通量在白天和夜间都经常存在较差的质量,在白天出现的较差质量主要受湍流动量发展非充分的影响;动量和感热通量在大气处于不稳定时并且风向为东风或西风时质量总体较好.近地层的无量纲化各风速分量与稳定度之间基本满足1/3次幂关系,符合Monin-Obukhov相似理论.分析显示,测站周围的人工物对观测有明显的干扰.在剔除干扰后,戈壁下垫面的动量粗糙度约为0.59mm,附加阻尼在白天的变化比较离散,初步给出白天时取κB?1=3.1的建议.还讨论了不同的热力参数化方案在戈壁下垫面的适用性,κB?1=3.1的方案能够较好描述戈壁下垫面在夏季白天的热力输送.

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