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Frederick J. Brousaides

A study has been conducted to determine the reliability of radiosonde humidity measurements at low relative humidities. Carbon hygristors were calibrated over a wide range of conditions and compared with manufacturing specifications. Some observed differences between military and NWS radiosonde measurements can be explained on the basis of data reduction technique.

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James F. Morrissey and Frederick J. Brousaides

Abstract

Temperature-induced humidity errors in the carbon humidity element ML-476 are described. The dominant error is caused by solar irradiation and results in a lowering of reported humidity values. The effect was found with both the military AN/AMT-12 and weather Bureau radiosondes. Flight studies indicate that a significant improvement in data acquisition will result from a blackening of the sensor channel walls.

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Frederick J. Brousaides and James F. Morrissey

Abstract

Efforts are described involving the development of an expendable, balloon-borne dew point hygrometer which is compatible with standard radiosonde equipment, maintains the inherent accuracy of this sensing technique, and as far as is possible reduces the cost. Presented here are both laboratory and field test data on a selected number of flights, together with a description of the device and its operation.

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Frederick J. Brousaides and James F. Morrissey

A modification to the radiosonde humidity channel to eliminate a temperature induced bias is described. Data are presented from flight test comparisons of radiosondes so modified and standard unmodified radiosondes. It is anticipated that the redesign of the current, standard radiosondes will reflect essentially the modifications described herein and consequently the data indicate the type and magnitude of change in the reported humidities which may be expected. The data are essentially in agreement with predicted changes from a previous paper (Morrissey and Brousaides, 1970). Further field testing of this and other modifications is proposed to determine residual error. Similar tests to standard instrumentation would permit corrections to archived data.

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James F. Morrissey and Frederick J. Brousaides

Abstract

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