Advances in Atmospheric Sciences

, Volume 32, Issue 6, pp 821–830 | Cite as

Deep convective clouds over the northern Pacific and their relationship with oceanic cyclones

Article

Abstract

Based on combined CloudSat/CALIPSO detections, the seasonal occurrence of deep convective clouds (DCCs) over the midlatitude North Pacific (NP) and cyclonic activity in winter were compared. In winter, DCCs are more frequent over the central NP, from approximately 30°N to 45°N, than over other regions. The high frequencies are roughly equal to those occurring in this region in summer. Most of these DCCs have cloud tops above a 12 km altitude, and the highest top is approximately 15 km. These wintertime marine DCCs commonly occur during surface circulation conditions of low pressure, high temperature, strong meridional wind, and high relative humidity. Further, the maximum probability of DCCs, according to the high correlation coefficient, was found in the region 10°–20° east and 5°–10° south of the center of the cyclones. The potential relationship between DCCs and cyclones regarding their relative locations and circulation conditions was also identified by a case study. Deep clouds were generated in the warm conveyor belt by strong updrafts from baroclinic flows. The updrafts intensified when latent heat was released during the adjustment of the cyclone circulation current. This indicates that the dynamics of cyclones are the primary energy source for DCCs over the NP in winter.

Key words

CloudSat deep convective clouds marine cyclones northern Pacific 

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Copyright information

© Chinese National Committee for International Association of Meteorology and Atmospheric Sciences, Institute of Atmospheric Physics, Science Press and Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Mingjian Yi
    • 1
    • 2
  • Yunfei Fu
    • 1
    • 3
  • Peng Liu
    • 1
    • 2
  • Zhixia Zheng
    • 1
  1. 1.University of Science and Technology of ChinaHefeiChina
  2. 2.Anhui Provincial Academy of Environmental SciencesHefeiChina
  3. 3.State Key Laboratory of Severe WeatherChinese Academy of Meteorological SciencesBeijingChina

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