Abstract Vapor pressure deficit (VPD) is one of the critical variables that drives evapotranspiration, and is of fundamental importance in crop physiology and modeling in the face of climate change. Unfortunately, direct records of atmospheric moisture are rarely available at short temporal scales, e.g. hourly, and country or regional scales. Most models use approximations to estimate daily transpiration-weighted VPD. Tanner and Sinclair (1983) suggested an approach to calculate weighted daily VPD as a fraction (0.75) of the difference between daily maximum and minimum vapor pressure based on estimates calculated from daily maximum and minimum temperatures, respectively. A test of the Tanner-Sinclair suggestion is reported by obtaining daily weighted VPD from hourly measurements of humidity and temperature. The objective of this study was to assess the fractional value to obtained daily weighted VPD estimations. This study was based on ten years of hourly weather data collected at thirty five stations across the wide diversity of environments that exist in France.

中文翻译：

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用于蒸腾估计的加权 VPD 的季节性和气候变化

摘要 蒸气压亏缺（VPD）是驱动蒸发蒸腾的关键变量之一，在面对气候变化的作物生理学和建模中具有根本重要性。不幸的是，在短时间尺度（例如每小时）以及国家或区域尺度上，很少有大气湿度的直接记录可用。大多数模型使用近似值来估计每日蒸腾加权 VPD。Tanner 和 Sinclair (1983) 提出了一种方法来计算加权的每日 VPD，作为每日最大和最小蒸汽压之间差异的分数 (0.75)，基于分别根据每日最高和最低温度计算得出的估计值。通过从每小时的湿度和温度测量中获得每日加权的 VPD，报告了对 Tanner-Sinclair 建议的测试。本研究的目的是评估获得的每日加权 VPD 估计值的分数值。这项研究基于在法国存在的广泛环境中的 35 个站点收集的十年每小时天气数据。