Abstract Measurements of turbulent energy fluxes between land surface and the atmosphere are commonly carried out applying the eddy covariance (EC) method. Nevertheless, in some cases (e.g. surface heterogeneity, remote sensing or model validation), the use of a Large Aperture Scintillometer (LAS) is more appropriate. We compared LAS and EC measurements of sensible heat flux (H) over two contrasting vineyards of Southern (MIN site) and Northern (LIS site) Italy, mainly differentiating for climate (i.e. dry and humid), water management (i.e. irrigated and rainfed), and LAS setup. The relationship between H by LAS (HLAS) and by EC (HEC) was good at both sites, but with slightly higher HLAS. At MIN, where multiple EC stations were deployed, the best agreement was found with the station in the center of LAS path. Surface heterogeneity due to irrigation had different impact on HLAS depending on location of the source area. The canopy growth at LIS during the study period caused the approaching of LAS beam to the roughness sublayer, resulting in a reduction of HLAS compared to HEC. The closure of energy balance was higher (79%) at MIN and lower (64%) at LIS, but the agreement between HLAS and HEC was similar at both sites, suggesting that particular attention should be given to latent heat flux measurements by EC in order to better understand the energy balance closure issue.

中文翻译：

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通过大孔径闪烁测量法和涡流协方差比较两个对比鲜明的气候葡萄园的感热通量

摘要 地表和大气之间湍流能量通量的测量通常应用涡度协方差（EC）方法进行。然而，在某些情况下（例如表面异质性、遥感或模型验证），使用大孔径闪烁仪 (LAS) 更为合适。我们比较了意大利南部（MIN 站点）和北部（LIS 站点）两个对比鲜明的葡萄园的 LAS 和 EC 显热通量 (H) 测量值，主要区分气候（即干燥和潮湿）、水管理（即灌溉和雨养）和 LAS 设置。H by LAS (HLAS) 和 by EC (HEC) 之间的关系在两个站点都很好，但 HLAS 略高。在部署了多个 EC 站点的 MIN 处，发现与位于 LAS 路径中心的站点的最佳一致性。灌溉造成的地表异质性对 HLAS 的影响取决于源区的位置。研究期间 LIS 的冠层生长导致 LAS 光束接近粗糙度子层，与 HEC 相比，导致 HLAS 减少。MIN 的能量平衡闭合度较高 (79%)，LIS 的能量平衡闭合度较低 (64%)，但 HLAS 和 HEC 之间的一致性在两个地点相似，这表明应特别注意 EC 的潜热通量测量为了更好地理解能量平衡闭合问题。