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Xubin Zeng, Zhuo Wang, and Aihui Wang

–169). Finally even over a relatively flat surface with light synoptic winds, there are usually a lot of transient phenomena (e.g., waves, density currents, etc.) that can lead to bursts of heat flux so that the average SH is not zero (e.g., Mahrt 2010 ). A main reason for the above discrepancies is that, when the surface layer is very stable (e.g., for z / L greater than 1–2), the boundary layer depth is too shallow, and the measurement height z is above the surface layer where the similarity theory

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Craig R. Ferguson, Eric F. Wood, and Raghuveer K. Vinukollu

1. Introduction Land surface–atmosphere interaction (henceforth, coupling), or degree to which anomalies in the land surface state (i.e., soil wetness, soil texture, surface roughness, temperature, and overlying vegetation composition and structure) can affect (through complex controls on the partitioning of surface turbulent fluxes) the planetary boundary layer (PBL) and, in extreme cases, rainfall generation, is an important—if not the single most fundamental—criterion for evaluating

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