Sporadic breakdowns of stability in the PBL over simple and complex terrain
Sporadic breakdowns of stability in the PBL over simple and complex terrain
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DOI：
10.1007/bf00119413
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发表时间：
1991
影响因子：
4.3
通讯作者：
C. Nappo
中科院分区：
文献类型：
--
作者：
C. Nappo
Breakdowns of stability in the PBL are examined using one-minute average horizontal wind speeds and temperatures observed over many nights at stations located in simple and complex terrain. The analysis is based on the temporal behavior of the wind speed-temperature covariance, which is obtained by digital bandpass filtering. It is shown that breakdowns are a common feature of the stable PBL over both simple and complex environments. Vertical fluxes of heat during breakdowns are estimated to be a significant fraction of the nighttime average heat flux. It is hypothesized that a major portion of the nighttime vertical transfer of heat, momentum, and atmospheric pollutants occurs during periods of stability breakdowns.
