Our understanding of the factors influencing the interannual variation of autumn haze pollution in the North China Plain (NCP) remains quite limited. Here, we investigate interannual variations of atmospheric haze pollution and associated atmospheric anomalies in the NCP during autumn (September, October, and November). Pronounced anticyclonic anomalies tend to be observed around northeastern Asia when more severe haze pollution occurs over the NCP during this season. However, the processes underlying the impact of the atmospheric anomalies on the NCP haze show considerable intra-seasonal differences. In September, anticyclonic anomalies impact the NCP haze via modulating the surface relative humidity (SRH) and boundary layer height (BLH), while changes in surface wind speed (SWS) are not found to be related to the NCP haze. In contrast, the interannual variation of the NCP haze has a close relationship with the changes of SWS, SRH, and BLH in both October and November. The factors responsible for formation of the anticyclonic anomalies around northeastern Asia are found to differ greatly over the 3 months. In September, the formation of anticyclonic anomalies is related to the East Atlantic (EA) pattern, which triggers an eastward propagating atmospheric wave train extending from Europe to northeastern Asia. In October, the Scandinavia teleconnection is crucial for generating anticyclonic anomalies. While in November, the formation of the anticyclonic anomalies is largely due to the joint effect of the Scandinavia and East Atlantic/Western Russian teleconnections, as well as the non-negligible influence caused by sea surface temperature anomalies in the tropical central-eastern Pacific.

我们对影响华北平原秋季霾霾年际变化的因素的理解仍然十分有限。在这里，我们调查了秋季（9月，10月和11月）NCP的大气霾污染及其相关的大气异常的年际变化。当本季节NCP上空发生更严重的霾污染时，在东北亚附近通常会观察到明显的反气旋异常。但是，大气异常对NCP霾影响的过程显示出明显的季节内差异。9月，反气旋异常通过调节表面相对湿度（SRH）和边界层高度（BLH）影响NCP霾，而表面风速（SWS）的变化与NCP霾无关。相反，NCP雾度的年际变化与10月和11月SWS，SRH和BLH的变化密切相关。在过去的三个月中，发现造成东北亚周围反气旋异常形成的因素差异很大。9月，反气旋异常的形成与东大西洋（EA）模式有关，这引发了从欧洲延伸到东北亚的向东传播的大气波列。十月份，斯堪的纳维亚半岛的远程连接对于产生反气旋异常至关重要。虽然在11月，反气旋异常的形成很大程度上是由于斯堪的纳维亚半岛与东大西洋/俄罗斯西部遥相关的共同作用，