Precursors of deep moist convection in a subkilometer global simulation

Yoshiaki Miyamoto, Tsuyoshi Yamaura, Ryuji Yoshida, Hisashi Yashiro, Hirofumi Tomita, Yoshiyuki Kajikawa

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Deepmoist convection in the atmosphere plays an important role in cloudy weather disturbances, such as hurricanes, and even in the global climate. The convection often causes disastrous heavy rainfall, and predicting such convection is therefore critical for both disaster prevention and climate projection. Although the key parameters for convection have been pointed out, understanding the preprocesses of convection is a challenging issue. Here we identified the precursors of convection by analyzing a global simulated data set with very high resolution in time and space. We found that the mass convergence near the Earth’s surface changed significantly several minutes before the initiation of early convection (the formation of cumulus clouds), which occurred with the increase in the convective available potential energy (CAPE). Decomposition of the statistical data revealed that a higher-CAPE environment resulted in stronger convection than in the stronger-convergence case. Furthermore, for the stronger-convergence case, the precursor was detected earlier than the total average (10-15 min before the initiation), whereas the amplitude of maximum velocity was not so strong as the higher-CAPE case. This suggests that the strength of convection is connected with CAPE, and the predictability is sensitive to the convergence.

Original languageEnglish
Pages (from-to)12,080-12,088
JournalJournal of Geophysical Research
Volume121
Issue number20
DOIs
Publication statusPublished - 2016 Oct 27
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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  • Cite this

    Miyamoto, Y., Yamaura, T., Yoshida, R., Yashiro, H., Tomita, H., & Kajikawa, Y. (2016). Precursors of deep moist convection in a subkilometer global simulation. Journal of Geophysical Research, 121(20), 12,080-12,088. https://doi.org/10.1002/2016JD024965