Collaborative Research on Development and Evaluation of Continuously Weighing Minilysimeters

微型连续称重仪研制与评价的协同研究

• 批准号: 8921919
• 负责人: C Susan Grimmond
• 金额: $ 2.38万
• 依托单位: Indiana University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-02-01 至 1992-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8921919&HistoricalAwards=false
• 关键词: Collaborative; Research; Development; Evaluation; Continuously

Inquiries into microclimatological patterns and processes have been inhibited by difficulties in determining micro-scale variations in heat and moisture transfers. Among the most important variables are transfers of water vapor through evaporation and transpiration from ground surfaces and vegetation into the air. Lysimeters have been developed to directly measure evapotranspiration, but these machines are large, stationary, expensive, and capable only of averaging readings over the area that they cover. This collaborative research project will refine and test a set of minilysimeters to measure spatial variations in the transfer of heat and moisture. Three continuously weighing, portable minilysimeters will be designed and tested in a carefully controlled experiment that will compare their measurements with records obtained using three alternative microclimatological approaches. This project will determine the extent to which small, portable minilysimeters can be used to accurately measure evapotranspiration in a variety of different sites. These tests will help ascertain the conditions in which these instruments will be useful and the confidence with which the data that they collect can be used. Because of the potential for using instruments of this type to provide heretofore unavailable information about micro-scale spatial variability in heat and moisture transfer, the project should contribute significantly toward advancement of microclimatological research.

对微气候模式和过程的研究 由于难以确定微尺度变化， 热量和水分的转移。 其中最重要的变量是 水蒸气通过蒸发和蒸腾从 地面和植被被吹到空中。 蒸渗仪已经 直接测量蒸发蒸腾量，但这些机器 大，固定，昂贵，只能平均 它们所覆盖的区域的读数。 这项合作研究 该项目将完善和测试一套微型测量仪，以测量空间 热量和水分传递的变化。 三个连续 称重，便携式微型万用表将设计和测试在一个 仔细控制的实验，将比较他们的测量 用三种不同的小气候学方法获得的记录， 接近。 这个项目将决定在多大程度上，小，便携式 微型蒸散计可用于精确测量 各种不同的网站。 这些测试将有助于确定 这些工具将发挥作用的条件和信心 他们收集的数据可以用来做什么。 因为 使用这种类型的仪器提供迄今为止 关于热量微尺度空间变化的不可用信息 和水分转移，该项目应有助于显着 微气候学研究的进展。