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. Severe haze occurred in the North China Plain (NCP) from Novemberto December 2015, with a wide spatial range and long duration. In thispaper, the combined effect of the anomalous stationary Rossby waves withintwo westerly jet waveguides on this haze event in the NCP is investigatedbased on observational visibility data and NCEP/NCAR reanalysis data. Theresults show that circulation anomalies in Eurasia caused by the propagationof anomalous stationary Rossby wave energy along two waveguides within thewesterly jet originating from the Mediterranean were responsible for hazeformation in the NCP. The Rossby waves propagated eastward along thesubtropical westerly jet and the polar front jet, causing an anomalousanticyclone over the Sea of Japan and anticyclonic wind shear at 850 hPaover the NCP, which enhanced the anomalous descent in the middle and lowertroposphere and subsequently resulted in a stable lower atmosphere.Furthermore, the anomalous stationary Rossby waves propagating along thepolar front jet weakened the East Asia trough and Ural ridge andstrengthened the anomalous southerly wind at 850 hPa over the coastal areasof eastern China, decelerating the East Asia winter monsoon. The abovemeteorological conditions modulated haze accumulation in November andDecember 2015. Meanwhile, continuous rainfall related to ascending motiondue to Rossby wave propagation along the waveguide provided by thesubtropical westerly jet occurred in a large area of southern China. Theassociated latent heat release acted as a heat source, intensifying theascending motion over southern China so that the descending motion over theNCP was strengthened, favoring the maintenance of severe haze. This studyelucidates the formation and maintenance mechanism of large-scale haze inthe NCP in late fall and boreal winter.

The combined effect of two westerly jet waveguides on heavy haze in the North China Plain in November and December 2015