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This paper introduces a definition of sand/dust storm process as a new standardand idea of sand/dust storm (SDS) groups a number of SDS-events in NortheastAsia. Based on the meteorological data from WMO/GOS network, 2456 Chinese surface stations and NCEP-NCAR reanalysis, the sand/dust stormprocesses in Northeast Asia in spring 2000–2006 are investigated. And theevolutions of anomalies of general circulation in the troposphere areanalyzed by comparing the spring having most and least occurrences of SDS inyear 2006 and 2003. Associated with the noticeably increased occurrence ofSDS processes in spring 2006, the anomalies in 3-D structure of generalcirculation especially in the mid-and high latitudes of the NorthenHemisphere (NH) are revealed. The transition period from the winter of 2005to spring 2006 has witnessed a fast-developed high center over thecircumpolar vortex area in the upper troposphere, which pushes the polarvortex more southwards to mid-latitudes with a more extensive area over theeast NH. In spring 2006, there are the significant circulation anomalies inthe middle troposphere from the Baikal Lake to northern China with astronger southward wind anomaly over Northeast Asia. Compared with a normalyear, stronger meridional wind with a southward wind anomaly also in thelower troposphere prevail over the arid and semiarid regions in Mongolia andnorthern China during spring 2006. The positive anomalies of surface highpressure registered an abnormal high of 4–10 hPa in the Tamil Peninsularmake a stronger cold air source for the repeated cold air outbreak acrossthe desert areas in spring 2006 resulting in the most frequent SDS seasonsin the last 10 years in Northeast Asia

Sand/dust storm processes in Northeast Asia and associated large-scale circulations