Journal of Meteorological Research

, Volume 31, Issue 4, pp 694–707 | Cite as

Climate characteristics of abnormal double-blocking activities over the Ural Mountains and Sea of Okhotsk

  • Gang Liu
  • Tao Wang
  • Xueyan Yang
  • Yishu Wang
  • Xu Yang
  • Yan Cui
Article
  • 18 Downloads

Abstract

By using NCEP–NCAR daily reanalysis data for June–August of 1948–2009, the synoptic situation of the doubleblocking high pressure process over the Ural Mountains–Sea of Okhotsk region was identified objectively, and the climatic characteristics and dynamic mechanism during the double blockings were also investigated. The results suggest that the Urals–Okhotsk double-blocking high experienced obviously an abrupt change around 1977. After the change, the occurrence frequency and number of sustained days of the blocking high reduced significantly. Moreover, the zonal spacing between the Urals blocking and the Okhotsk blocking also decreased, while their meridional locations did not change much. The double blockings became strengthened in general, and the blocking high over the Sea of Okhotsk extended northward evidently. However, during the process without double-blocking activities, the intensity and location of the double-blocking high showed no noticeable variation before and after the abrupt change. In addition, dynamic diagnosis shows that after the abrupt change, the energy of the double-blocking high mainly propagated vertically from low to high levels, and transferred horizontally from low to high latitudes; whereas, previously, before the abrupt change, this occurred from high to low latitudes. Meanwhile, the development of a low pressure system was fueled between the double blockings, which meant that the double-blocking activity was beneficial to the maintenance and development of the Northeast China cold vortex. In short, diagnosis of the wave energy has provided us with a better explanation of the life cycle characteristics of this double-blocking phenomenon before and after 1977.

Key words

objective identification blocking high dynamic diagnosis characteristics analysis 

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Copyright information

© The Chinese Meteorological Society and Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Gang Liu
    • 1
  • Tao Wang
    • 2
  • Xueyan Yang
    • 3
  • Yishu Wang
    • 2
    • 4
  • Xu Yang
    • 1
  • Yan Cui
    • 2
  1. 1.Laboratory of Middle–High Latitude Circulation System and East Asian Monsoon ResearchJilin Institute of Meteorological SciencesChangchun 130062China
  2. 2.Shenyang Regional Climate CenterShenyangChina
  3. 3.Jilin Meteorological ObservatoryChangchunChina
  4. 4.Shenyang Agricultural UniversityShenyangChina

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