English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Atmospheric pollution has become a serious environmental and social problemin China. Over the past 30 years, the number of winter (December–February)haze days over the North China Plain (WHDNCP) was greatest in 2014.In addition to anthropogenic influence, climate anomalies also played arole. Thus, it isnecessary to analyze the anomalous atmosphere circulations associated withhaze pollution of this year in detail. Near the surface, the weaker EastAsian winter monsoon pattern, causing southerly winds overthe North China Plain, could aggravate the situation of haze. In the lowerand middle troposphere, taking the anticyclone circulation over North Chinaas an intermediate system, the positive phases of the easternAtlantic/western Russia (EA/WR), the western Pacific (WP), and the Eurasia(EU) patterns led to a worse air pollution dispersion condition thatcontributed to a larger number of WHDNCP. In 2014, these threepatterns could be recognized from the wind anomalies in the lowertroposphere. The preceding autumn (September–November) Arctic sea ice (ASI)anomalies over the eastern Hemisphere and the warmer winter surface overEurasia might have induced or intensified the positive EA/WR pattern in 2014.These two external forcings, together with the pre-autumn sea surfacetemperature anomalies in the Pacific, might have also stimulated or enhancedthe positive EU-like patterns. The anomalous surface temperature in autumn2014 was efficient in intensifying anomalous circulations such as thepositive phase of the WP pattern. The opposite case of minimumWHDNCP in 2010 further supports the mechanism of how EA/WR and WPpatterns and associated external factors altered the local climate conditionsto impact the WHDNCP

Understanding severe winter haze events in the North China Plain in 2014: roles of climate anomalies