Persistent Link:
http://hdl.handle.net/10150/301140
Title:
An Exchange System for Precise Measurements of Temperature and Humidity Gradients in the Air Near the Ground
Author:
Gay, L. W.; Fritschen, L. J.
Affiliation:
School of Renewable Natural Resources, University of Arizona, Tucson
Issue Date:
13-Apr-1979
Rights:
Copyright ©, where appropriate, is held by the author.
Collection Information:
This article is part of the Hydrology and Water Resources in Arizona and the Southwest collections. Digital access to this material is made possible by the Arizona-Nevada Academy of Science and the University of Arizona Libraries. For more information about items in this collection, contact anashydrology@gmail.com.
Publisher:
Arizona-Nevada Academy of Science
Journal:
Hydrology and Water Resources in Arizona and the Southwest
Abstract:
Small differences can be very accurately measured with two sensors if precautions are taken to periodically interchange the sensors between observations. The Bowen ratio model of evapotranspiration requires measurements of air temperature and humidity gradients near the evaporating surface. The gradients are in the order of only 0.1 °C/m or 10 Pa/m. Precision in excess of 0.01 °C/m or 1 Pa/m can be obtained only through laborious calibration and replication of instruments, or through periodic interchange. The design of a simple system for interchanging psychrometers is described. The system will exchange sensors between two levels one meter apart at selected time intervals. The vertical exchange path of this design maintains a constant orientation of the sensors and has important advantages over rotating systems used elsewhere. The principles apply to a variety of measurement problems.
Keywords:
Hydrology -- Arizona.; Water resources development -- Arizona.; Hydrology -- Southwestern states.; Water resources development -- Southwestern states.
ISSN:
0272-6106

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleAn Exchange System for Precise Measurements of Temperature and Humidity Gradients in the Air Near the Grounden_US
dc.contributor.authorGay, L. W.en_US
dc.contributor.authorFritschen, L. J.en_US
dc.contributor.departmentSchool of Renewable Natural Resources, University of Arizona, Tucsonen_US
dc.date.issued1979-04-13-
dc.rightsCopyright ©, where appropriate, is held by the author.en_US
dc.description.collectioninformationThis article is part of the Hydrology and Water Resources in Arizona and the Southwest collections. Digital access to this material is made possible by the Arizona-Nevada Academy of Science and the University of Arizona Libraries. For more information about items in this collection, contact anashydrology@gmail.com.en_US
dc.publisherArizona-Nevada Academy of Scienceen_US
dc.identifier.journalHydrology and Water Resources in Arizona and the Southwesten_US
dc.description.abstractSmall differences can be very accurately measured with two sensors if precautions are taken to periodically interchange the sensors between observations. The Bowen ratio model of evapotranspiration requires measurements of air temperature and humidity gradients near the evaporating surface. The gradients are in the order of only 0.1 °C/m or 10 Pa/m. Precision in excess of 0.01 °C/m or 1 Pa/m can be obtained only through laborious calibration and replication of instruments, or through periodic interchange. The design of a simple system for interchanging psychrometers is described. The system will exchange sensors between two levels one meter apart at selected time intervals. The vertical exchange path of this design maintains a constant orientation of the sensors and has important advantages over rotating systems used elsewhere. The principles apply to a variety of measurement problems.en_US
dc.subjectHydrology -- Arizona.en_US
dc.subjectWater resources development -- Arizona.en_US
dc.subjectHydrology -- Southwestern states.en_US
dc.subjectWater resources development -- Southwestern states.en_US
dc.identifier.issn0272-6106-
dc.identifier.urihttp://hdl.handle.net/10150/301140-
dc.identifier.journalHydrology and Water Resources in Arizona and the Southwesten_US
dc.typetexten_US
dc.typeProceedingsen_US
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