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Ovarlez 1991
Ovarlez, J. (1991). Stratospheric water vapor measurement in the tropical zone by means of a frost point hygrometer on board long-duration balloons. Journal of Geophysical Research 96: doi: 10.1029/91JD01215. issn: 0148-0227.

Two long-duration balloon flights were performed during austral summer in the southern hemisphere tropical zone, between 23¿S and 10¿S, for stratospheric water vapor measurement by means of a frost point hygrometer. The observations show a mixing ratio minimum of about 3.5 ppmv near 50 hPa that corroborates the existence of the hygropause in low-latitude areas. Also observed was the approach of saturation conditions near a particularly cold tropopause in the highly convective area around New Hebrides, where cloud top temperatures as low as -84¿C were seen with GMS satellite data. ¿ American Geophysical Union 1991

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Keywords
Meteorology and Atmospheric Dynamics, Tropical meteorology, Atmospheric Composition and Structure, Middle atmosphere—composition and chemistry, Meteorology and Atmospheric Dynamics, Instruments and techniques, Meteorology and Atmospheric Dynamics, Turbulence
Journal
Journal of Geophysical Research
http://www.agu.org/journals/jb/
Publisher
American Geophysical Union
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