Response of the stratospheric temperatures and ozone to past and future increases in stratospheric humidity

作者：Victor L. Dvortsov, Susan Solomon · 发表于：Journal of Geophysical Research Atmospheres · 年份：2001 · DOI：10.1029/2000jd900637 · 被引用次数：168 · 研究领域：Atmospheric Ozone and Climate、Atmospheric chemistry and aerosols、Atmospheric and Environmental Gas Dynamics

Balloonsonde and aircraft in situ and remote sensing measurements in the Northern Hemisphere midlatitudes show that stratospheric humidity has been increasing since 1954. Satellite data, albeit only available over a much shorter period (1992 through 1999), also suggest that water vapor has been increasing globally over much of the stratosphere. Implications of these trends for stratospheric temperatures and ozone are explored using a two‐dimensional interactive radiative‐chemical‐dynamical model. It is shown that the increase in humidity cools the model stratosphere, in agreement with previous studies. In the midlatitude lower stratosphere, increasing water vapor induces a temperature trend of about −0.25 to −0.35 K per decade, which is ∼30–50% of the observed cooling in this region. According to our results, such trends in water vapor have intensified Northern Hemisphere midlatitude ozone trends over the last few decades, mainly via the enhancement of ozone loss in HOx catalytic cycles and changes in chlorine partitioning (in spite of some buffering by concomitant increases in the O3 production in the methane oxidation cycle). Increasing humidity in the model accounts for additional depletion of midlatitude column ozone at a rate of −0.3% per decade and up to −0.7% (−1%) per decade enhancement of local ozone trends in the lower (upper) stratospheres, accordingly. It is important to investigate what will be the likely consequences for stratospheric climate and ozone if the wa...