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The increase in stratospheric water vapor from balloonborne, frostpoint hygrometer measurements at Washington, D.C., and Boulder, Colorado
Author(s) -
Oltmans Samuel J.,
Vömel Holger,
Hofmann David J.,
Rosenlof Karen H.,
Kley Dieter
Publication year - 2000
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2000gl012133
Subject(s) - water vapor , environmental science , atmospheric sciences , hygrometer , middle latitudes , stratosphere , altitude (triangle) , northern hemisphere , climatology , southern hemisphere , meteorology , humidity , geology , geography , geometry , mathematics
Stratospheric water vapor concentrations measured at two midlatitude locations in the northern hemisphere show water vapor amounts have increased at a rate of 1–1.5% yr −1 (0.05–0.07 ppmv yr −1 ) for the past 35 years. At Washington, D.C., measurements were made from 1964–1976, and at Boulder, Colorado, observations began in 1980 and continue to the present. While these two data sets do not comprise a single time series, they individually show increases over their respective measurement periods. At Boulder the trends do not show strong seasonal differences; significant increases are found throughout the year in the altitude range 16–28 km. In winter these trends are significant down to about 13 km.