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

. Nitrogen dioxide (NO2) is mainly affected by local emission andmeteorology rather than long-range transport. Accurate knowledge of itslong-term variabilities and drivers is significant for understanding theevolution of economic and social development, anthropogenic emission, andthe effectiveness of pollution control measures on a regional scale. In thisstudy, we quantity the long-term variabilities and the underlying drivers ofNO2 from 2005–2020 over the Yangtze River Delta (YRD), one of themost densely populated and highly industrialized city clusters in China,using OMI spaceborne observations and the multiple linear regression (MLR)model. We have compared the spaceborne tropospheric results to surfacein situ data, yielding correlation coefficients of 0.8 to 0.9 over allmegacities within the YRD. As a result, the tropospheric NO2 columnmeasurements can be taken as representative of near-surface conditions, andwe thus only use ground-level meteorological data for MLR. Theinter-annual variabilities of tropospheric NO2 vertical columndensity (NO2 VCDtrop) from 2005–2020 over the YRD can bedivided into two stages. The first stage was from 2005–2011, which showedoverall increasing trends with a wide range of (1.91 ± 1.50) to (6.70 ± 0.10) × 1014 molec. cm−2 yr−1(p&lt;0.01) over the YRD. The second stage was from 2011–2020,which showed overall decreasing trends of (−6.31 ± 0.71) to (−11.01 ± 0.90) × 1014 molec. cm−2 yr−1(p&lt;0.01) over each of the megacities. The seasonal cycles ofNO2 VCDtrop over the YRD are mainly driven by meteorology(81.01 %–83.91 %), except during winter when anthropogenic emissioncontributions are pronounced (16.09 %–18.99 %). The inter-annualvariabilities of NO2 VCDtrop are mainly driven by anthropogenicemission (69.18 %–81.34 %), except for a few years such as 2018 whichare partly attributed to meteorology anomalies (39.07 %–91.51 %). Theincreasing trends in NO2 VCDtrop from 2005–2011 over the YRDare mainly attributed to high energy consumption associated with rapideconomic growth, which causes significant increases in anthropogenic NO2 emission. The decreasing trends in NO2 VCDtrop from 2011–2020over the YRD are mainly attributed to the stringent clean air measures whicheither adjust high-energy industrial structure toward low-energy industrialstructure or directly reduce pollutant emissions from different industrialsectors.

atmospheric chemistry and physics

Spaceborne tropospheric nitrogen dioxide (NO&amp;lt;sub&amp;gt;2&amp;lt;/sub&amp;gt;) observations from 2005–2020 over the Yangtze River Delta (YRD), China: variabilities, implications, and drivers