In 2000 a sudden severe drop in stratospheric water vapor levels interrupted the supposed long‐term increase of this greenhouse gas, an important contributor to global warming and climate variability. Satellite sensors observed a recovery in the following years, hidden behind a large variability. More recently, during 2011 and 2012, measurements revealed another severe drop in stratospheric water vapor concentrations.
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Urban et al. (2014) studied this question.
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