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VARIATIONS IN ATMOSPHERIC WATER VAPOR: BASELINE RESULTS FROM SMITHSONIAN OBSERVATIONS
ROBERT G. ROOSEN and RONALD J. ANGIONE
Publications of the Astronomical Society of the Pacific
Vol. 89, No. 532 (December 1977), pp. 814-822
Published by: Astronomical Society of the Pacific
Stable URL: http://www.jstor.org/stable/40677169
Page Count: 9
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Analysis is made of midmorning measurements of absolute humidity at ground level, and spectroscopie determinations of total atmospheric precipitable water vapor above the field stations of the Astrophysical Observatory of the Smithsonian Institution (APO). The APO data used in this study cover the period 1912-52 and nine mountain sites (altitudes 1500 m-2711 m) in North and South America and Africa. Reported values for over 3000 days are used. Large seasonal variations are apparent, with the maximum amounts of precipitable water vapor occurring very close to midsummer at all sites. Substantial longer-term variations are also present. The observed mean amounts of precipitable water vapor for various APO sites show reasonable agreement with Kuiper's generalized predictions. Study of the relation between precipitable water vapor and surface humidity shows a strong positive correlation, but the variance is so large that surface humidity is not a reliable indicator of precipitable water vapor for any particular day.
Publications of the Astronomical Society of the Pacific © 1977 The University of Chicago Press