Local and Global Similarity in Turbulent Transfer of Heat, Water Vapour, And CO2 in the Dynamic Convective Sublayer Over a Suburban Area
Local and Global Similarity in Turbulent Transfer of Heat, Water Vapour, And CO2 in the Dynamic Convective Sublayer Over a Suburban Area
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DOI：
10.1007/s10546-005-9034-4
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发表时间：
2006-07
影响因子：
4.3
通讯作者：
R. Moriwaki;M. Kanda
中科院分区：
文献类型：
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作者：
R. Moriwaki;M. Kanda
我们研究了城市表层内热量、水蒸气和二氧化碳垂直湍流输送的“局地”和“全球”相似性。这一结果是根据2001年7月晴天中午在日本东京的一个居民区进行的实地测量得出的。在本研究中，相关系数和象限分析被用来评价“全局”相似性，而小波分析被用来考察“局部”相似性。相关系数表明，水蒸气和CO2的传递效率普遍小于热量的传递效率。利用小波分析，我们发现热总是通过热和有组织的运动进行有效的传递。相比之下，水蒸气和二氧化碳是被动量，其传递效率不如热量。象限分析表明，喷吹换热大于扫射换热，喷扫换热比水蒸汽和CO2换热小。这表明向上运动可以更有效地传递热量，这支持了小波分析的结果。热量与CO2和水汽之间的湍流输送的差异可能是由于温度的活跃作用和标量源分布的不均匀造成的
We investigated the ‘local’ and ‘global’ similarity of vertical turbulent transfer of heat, water vapour, and CO2within an urban surface layer. The results were derived from field measurements in a residential area of Tokyo, Japan during midday on fair-weather days in July 2001. In this study, correlation coefficients and quadrant analysis were used for the evaluation of ‘global’ similarity and wavelet analysis was employed for investigating ‘local’ similarity. The correlation coefficients indicated that the transfer efficiencies of water vapour and CO2were generally smaller than that of heat. Using wavelet analysis, we found that heat is always efficiently transferred by thermal and organized motions. In contrast, water vapour and CO2, which are passive quantities, were not transferred as efficiently as heat. The quadrant analyses showed that the heat transfer by ejection exceeded that by sweep, and the ratios of ejection to sweep for water vapour and CO2transfer were less than that for heat. This indicated that heat is more efficiently transferred by upward motions and supported the findings from wavelet analysis. The differences of turbulent transfer between heat and both CO2and water vapour were probably caused both by the active role of temperature and the heterogeneity in the source distribution of scalars