radiosonde


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radiosonde

(rā`dēōsŏnd), group of instruments for simultaneous measurement and radio transmission of meteorological data, including temperature, pressure, and humidity of the atmosphere. The instrument package is usually carried into the atmosphere by a balloon (see weather balloonweather balloon,
balloon used in the measurement and evaluation of mostly upper atmospheric conditions (see atmosphere). Information may be gathered during the vertical ascent of the balloon through the atmosphere or during its motions once it has reached a predetermined maximum
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); balloon-borne radiosondes reach altitudes as great as 90,000 ft (27,400 m) above the earth's surface. A radiosonde may also be carried by a rocket, in which case it is known as a rocketsonde, or dropped by parachute (usually from an aircraft), in which case it is known as a dropsonde. Instruments included in a radiosonde are typically transducers for humidity, temperature, and pressure measurements; controls to improve return signals and determine which measurements are to be transmitted to data stations; and a radio transmitter. Radar also has been used to measure and transmit meteorological data from a radiosonde. These radiosonde observations are made as often as four times daily at some meteorological stations around the globe.

Radiosonde

 

an aerological instrument that measures the pressure, temperature, and humidity of the air; the values of these meteorological components are then automatically transmitted to earth by radio from various altitudes during the ascent through the atmosphere.

A radiosonde consists of sensing elements, transducers that convert the small changes of the sensing elements into electric values, coding apparatus, and a lightweight shortwave radio transmitter. The radiosonde is lifted by a pilot balloon to an altitude of 30 to 40 km. During the ascent, the radiosonde automatically sends coded signals corresponding to the instrument readings, and the signals are picked up by a radio receiver at the launching site. The operating range is approximately 150 to 200 km. There are balloon-borne radiosondes that can also measure wind velocity and direction.

Radiosondes are used extensively for vertical atmospheric sounding. The first radiosonde was constructed by the Soviet scientist P. A. Molchanov in 1930.

radiosonde

[′rād·ē·ō‚sänd]
(engineering)
A balloon-borne instrument for the simultaneous measurement and transmission of meteorological data; the instrument consists of transducers for the measurement of pressure, temperature, and humidity, a modulator for the conversion of the output of the transducers to a quantity which controls a property of the radio-frequency signal, a selector switch which determines the sequence in which the parameters are to be transmitted, and a transmitter which generates the radio-frequency carrier.

radiosonde

A radio transmitter used in conjunction with a balloon. It transmits data on temperature, pressure, and humidity. A radiosonde balloon can attain a height of approximately 65,000 ft (20 km) with small balloons and 115,000 ft (34 km) with large balloons. This balloon is tracked by radar to calculate upper winds. See radarsonde.

radiosonde

an airborne instrument to send meteorological information back to earth by radio
References in periodicals archive ?
The synergy between active-based lidar profiling and operational radiosonde profiling of local thermodynamic properties at Fairbanks helps distinguish the tropospheric nature of the clouds, as compared with polar stratospheric clouds for which they could have been confused at such heights during the subarctic winter.
Upper air data was also recorded from this site from the daily release of radiosondes (weather balloons) which take wind speed and direction measurements (along with other weather parameters).
1991) Spectral analysis of temperature and Brunt-Vaisala frequency fluctuations observed by radiosondes.
The GNSS techniques, in particular the GPS has proved its capacity for sensing the water vapour variability, providing measurements of integrated water vapour (IWV) along a column of atmosphere above a station with the same accuracy as other classical meteorological observation methods like radiosonde, radiometer, lidar or radar (Bevis et al.
Evidence for the rapid warming of the Arctic includes observations from high latitude weather stations, radiosonde and satellite observations of temperatures in the lower atmosphere and reanalysis of historical data.
Radiometer profiling during dynamic weather conditions is discussed and shows that the accuracy of radiometer retrievals is similar to radiosonde soundings when used for numerical weather prediction [19].
with a daily struggle to launch a radiosonde (using hydrogen produced on site).
The refractivity gradient is estimated from the radiosonde data obtained from South Africa Weather Service (SAWS).
Radiosonde measurements in Estonia and Finland are treated by Sirje Keevallik and Miina Krabbi, showing their invaluable role during the periods of volcanic eruptions when meteorological observations from airplanes are impossible.
Radiosonde measurements--Data provided by in situ measurements such as radiosondes, (10) for example through GRUAN (GCOS Reference Upper Air Network), (11) are critical and should be considered in future plans for mitigating data gaps.
Additionally, thanks to EGVAP and TOUGH products, we have got our ZTDs converted into the Precipitable Water Vapour (IWV) and we compared those with radiosonde data available nearby, example shown in Figure 12.