Observational and numerical study on the generation and maintenance mechanism of atmospheric blocking

阻塞是一种大尺度的反气旋，有时形成于中高纬度，持续时间长。它与2010年夏季高温和2011-2012年冬季寒冷和大雪等许多异常现象密切相关。因此，重要的是要弄清楚它是如何持续如此之久的。针对这一坚韧，本文提出阻塞反气旋可以选择性吸收天气反气旋的观点。天气反气旋是普遍存在的，并通过急流输送到阻塞反气旋附近。因此，阻塞反气旋总是被这种吸收所掩盖，并能持续很长时间。通过对真实的阻塞的数据分析和各种可能设置的数值模拟，证明了这一想法。

Blocking is a large-sclae anticyclone sometimes formed in mid- and high-latitudes, persisting for a long time. It is closely related to many anomalous phenomena such as hot summer in 2010 and cold winter and heavy snow in 2011-2012. It is therefore important to clarify how it persists so long. However, its maintenance mechanism has not been clarified in spite of many studies.To this tough problem, we proposed a new idea that blocking anticyclones can selectively absorb synoptic anticyclones. Synoptic anticyclones are ubiquitous and are transported near blocking anticyclones by the jet stream. Thus, blocking anticyclones are always refleshed by this absorption, and can persist for a long time. This idea was proved by data analyses of real blocking and numerical simulations for various possible settings.