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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

. Air pollution reaching hazardous levels in many Chinese citieshas been a major concern in China over the past decades. New policies havebeen applied to regulate anthropogenic pollutant emissions, leading tochanges in atmospheric composition and in particulate matter (PM)production. Increasing levels of atmospheric ammonia columns have beenobserved by satellite during recent years. In particular, observations fromthe Infrared Atmospheric Sounding Interferometer (IASI) reveal an increase ofthese columns by 15 % and 65 % from 2011 to 2013 and 2015, respectively,over eastern China. In this paper we performed model simulations for 2011,2013 and 2015 in order to understand the origin of this increase and toquantify the link between ammonia and the inorganic components of particles:NH4(p)+/SO4(p)2-/NO3(p)-. Interannual change ofmeteorology can be excluded as a reason: year 2015 meteorology leads toenhanced sulfate production over eastern China, which increases the ammoniumand decreases the ammonia content, which is contrary to satelliteobservations. Reductions in SO2 and NOx emissionsfrom 2011 to 2015 of 37.5 % and 21 % respectively, as constrained fromsatellite data, lead to decreased inorganic matter (by 14 % forNH4(p)++SO4(p)2-+NO3(p)-). This in turn leads toincreased gaseous NH3(g) tropospheric columns by as much as 24 %and 49 % (sampled corresponding to IASI data availability) from 2011 to2013 and 2015 respectively and thus can explain most of the observedincrease.

atmospheric chemistry and physics

The unintended consequence of SO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; and NO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt; regulations over China: increase of ammonia levels and impact on PM&amp;lt;sub&amp;gt;2.5&amp;lt;/sub&amp;gt; concentrations