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Observational climatology and characteristics of wintertime atmospheric blocking over Ural-Siberia

机译：乌拉尔-西伯利亚上空的冬季观测气候和特征

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摘要

This study investigates the climatological aspects and temporal characteristics of wintertime Ural-Siberian blocking (USB, centered over 30°-100°E), for the period 1980/1981-2009/2010. Sixty-eight events are identified and their physical structure is diagnosed using ther-modynamic and geostrophic vorticity tendency equations. In climatology, horizontal advections play a fundamental role in constructing a USB event, in which the anticyclonic center is a warm core in the troposphere and a cold core in the lower stratosphere. The decay of the thermal structure is related to diabatic cooling along the vertical structure and warm advection in the lower stratosphere. Meanwhile, the collapse of the height structure is caused primarily by cyclonic vorticity advection. A strong interrelationship exists between the intensity and extension of USB events. The temporal characteristics of USB events are analyzed by examining strong and weak events, which are of high and low intensity. The strong events are probably preceded by an open ridge over Europe and a cyclogenesis over the Mediterranean Sea, and their formation is followed by the stronger amplification of a Rossby wave packet across Eurasia. On the other hand, the weak events are likely to be triggered by surface cold anomalies over Siberia. Overall, the evolution of a USB event forms a dynamic linkage with the Siberian high, in which the decay stage of the USB event is accompanied by a southeastward migration of the Siberian high and a subsequent cold air outbreak in East Asia. These results advance our understanding of USB and its relationship with East Asian winter monsoon activities.
机译：本研究调查了1980 / 1981-2009 / 2010年期间冬季乌拉尔-西伯利亚阻塞（USB，中心在30°-100°E处）的气候特征和时间特征。使用热力学和地转涡度趋势方程式识别了68个事件，并诊断了它们的物理结构。在气候学中，水平对流在构造USB事件中起着基本作用，其中反气旋中心是对流层中的暖核和平流层下层的冷核。热结构的衰减与沿垂直结构的绝热冷却和平流层下部的热对流有关。同时，高度结构的崩溃主要是由旋风涡对流引起的。 USB事件的强度和扩展之间存在很强的相互关系。通过检查强事件和弱事件（强度高和弱）来分析USB事件的时间特征。在发生强事件之前，可能会出现欧洲上空的山脊和地中海上的气旋形成，其形成之后，整个欧亚大陆上的Rossby波包会更强地放大。另一方面，西伯利亚的地表冷异常可能触发了弱事件。总的来说，USB事件的演变与西伯利亚高压形成了动态联系，USB事件的衰减阶段伴随着西伯利亚高压向东南移动，随后东亚爆发了冷空气。这些结果增进了我们对USB及其与东亚冬季风活动的关系的了解。

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  • 来源
    《Climate dynamics》 |2013年第1期|63-79|共17页
  • 作者

    Ho Nam Cheung; Wen Zhou; Yaping Shao; Wen Chen; Hing Yim Mok; Man Chi Wu;

  • 作者单位

    Shenzhen Research Institute, City University of Hong Kong,Shenzhen, China;

    Shenzhen Research Institute, City University of Hong Kong,Shenzhen, China,Guy Carpenter Asia-Pacific Climate Impact Centre,School of Energy and Environment, City University of Hong Kong, Kowloon, Hong Kong, China;

    Institute for Geophysics and Meteorology,University of Cologne, Cologne, Germany;

    Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China;

    Guy Carpenter Asia-Pacific Climate Impact Centre,School of Energy and Environment, City University of Hong Kong, Kowloon, Hong Kong, China,Hong Kong Observatory, Hong Kong, China;

    Hong Kong Observatory, Hong Kong, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Atmospheric blocking; Climatology; Diagnostic analysis; Ural Mountains; Wintertime circulation;

    机译：大气阻塞;气候学;诊断分析;乌拉尔山脉;冬季循环;

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