Map and chart: Water vapor trends and anomalies
by IPCC AR5 WGI: Climate Change 2013: The Physical Science Basis, Chapter 2, p. 207
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(a) Trends in column integrated water vapor over ocean surfaces for the period 1988–2010. Trends have been calculated only for those grid boxes with greater than 70% complete records and more than 20% data availability in first and last decile of the period. Black plus signs (+) indicate grid boxes where trends are significant (i.e., a trend of zero lies outside the 90% confidence interval).
(b) Global annual average anomalies in column integrated water vapor averaged over ocean surfaces. Anomalies are relative to the 1988–2007 average.