<p>Static stability is an important quantity associated with vertical thermal structure, which can reflect the development of vertical movements at synoptic scale. As greenhouse warming, the trend of global precipitation is not as certain as that of air temperature and specific humidity. Weak or insignificant trends in precipitation are often attributed to the circulation weakening or more stable stratification. Increased precipitation may, however, enhance stratification stability through latent heat release and surface cooling. The interactions between them deserve further analyses. Using the element static stability (SS), the variability of atmosphere stratification stability and its relationship with precipitation at interannual and long-term scales are researched. Result shows that over most ocean areas, SS at lower layers generally varies ahead of, thus has effects on precipitation. Contrary to the common sense that the precipitation is usually depressed by stable stratification, in many areas, such as continents in summer hemisphere, the variation of static stability at lower troposphere generally lags behind precipitation, exhibiting its response to precipitation.</p>

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An analysis about the linkage between precipitation and atmosphere stratification at climate scale

  • Jiawei Hao,
  • Dian Yuan,
  • Xuehan Zhao,
  • Hao Long,
  • Qidong Ling,
  • Er Lu,
  • Juqing Tu,
  • Chenchen Fan

摘要

Static stability is an important quantity associated with vertical thermal structure, which can reflect the development of vertical movements at synoptic scale. As greenhouse warming, the trend of global precipitation is not as certain as that of air temperature and specific humidity. Weak or insignificant trends in precipitation are often attributed to the circulation weakening or more stable stratification. Increased precipitation may, however, enhance stratification stability through latent heat release and surface cooling. The interactions between them deserve further analyses. Using the element static stability (SS), the variability of atmosphere stratification stability and its relationship with precipitation at interannual and long-term scales are researched. Result shows that over most ocean areas, SS at lower layers generally varies ahead of, thus has effects on precipitation. Contrary to the common sense that the precipitation is usually depressed by stable stratification, in many areas, such as continents in summer hemisphere, the variation of static stability at lower troposphere generally lags behind precipitation, exhibiting its response to precipitation.