The inflatable sphere: A technique for the accurate measurement of middle atmosphere temperatures

In recent years there has been increasing interest in the utilization of the inflatable falling sphere technique for middle atmosphere studies. The falling sphere technique uses radar position information and the equation of motion to calculate density data from which temperature information is derived. Through theoretical derivation, simulation, and measurements it is demonstrated that the temperatures derived from falling spheres are not significantly affected by linear bias in the density measurements that originate from uncertainties in sphere mass, volume, or cross-sectional area. This study illustrates the sphere's capability to produce accurate temperatures up to 85 km and higher, given that the necessary reduction initialization conditions are met. At heights below 60 km, comparison of sphere temperatures with in situ thermistor measurements obtained close in space and time shows good agreement. Comparison with OH-radical rotational temperatures also confirms excellent agreement at 86 km. It is concluded that the sphere technique is an independent and highly accurate source of temperature measurement, is unique in being the only low-cost source of in situ measurement of temperature throughout the mesosphere and lower thermosphere, and qualifies as an intrinsic method to establish the accuracy of other atmospheric measurement systems.

[1]  F. Schmidlin,et al.  ATMOSPHERIC THERMAL STRUCTURE DURING A WINTER ANOMALY ABSORPTION EVENT , 1977 .

[2]  J. Horvath,et al.  Response of the neutral particle upper atmosphere to the solar eclipse of 7 March 1970 , 1972 .

[3]  C. R. Philbrick,et al.  Measurements of Atmospheric Density at Kwajalein Atoll, 18 May 1977. , 1978 .

[4]  M. Gelman,et al.  An evaluation of temperature profiles from falling sphere soundings , 1976 .

[5]  F. Schmidlin.  Repeatability and measurement uncertainty of the united states Meteorological Rocketsonde , 1981 .

[6]  Inez Y. Fung,et al.  Global climate changes as forecast by Goddard Institute for Space Studies three‐dimensional model , 1988 .

[7]  F. Lübken,et al.  Simultaneous temperature measurements in the mesosphere and lower thermosphere during the Mac/Epsilon campaign , 1989 .

[8]  F. Schmidlin.  Intercomparisons of temperature, density and wind measurements from in situ and satellite techniques , 1984 .

[9]  W. C. Lyons,et al.  Corrections for the Upper Atmosphere Temperatures Using a Thin Film Loop Mount , 1972 .

[10]  F. Schmidlin,et al.  Compatibility of Meteorological Rocketsonde Data as Indicated by International Comparison Tests , 1975 .

[11]  U. Zahn,et al.  Mesospheric temperatures and the OH layer height as derived from ground-based lidar and OH∗ spectrometry , 1987 .

[12]  D. Offermann,et al.  Ground-based atmospheric infrared and visible emission measurements. Report for 15 July 1983-14 June 1985 , 1985 .

[13]  K. D. Baker,et al.  Density and temperature structure over northern Europe , 1985 .

[14]  J. Angell.  Rockesonde Evidence for a Stratospheric Temperature Decrease in the Western Hemisphere during 1973 85 , 1987 .

[15]  W. Smith,et al.  Grenade Experiments in a Program of Synoptic Meteorological Measurements , 1968 .

[16]  B. R. Kirkwood,et al.  The mean observed meteorological structure and circulation of the stratosphere and mesosphere , 1972 .