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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We have run a chemistry transport model (CTM) to systematically examinethe drivers of interannual variability of tropospheric composition during 1996–2000.This period was characterised by anomalous meteorological conditionsassociated with the strong El Niño of 1997–1998 and intense wildfires, which produced a large amount ofpollution. On a global scale, changing meteorology (winds, temperatures,humidity and clouds) is found to be the most important factordriving interannual variability of NO<sub>2</sub> and ozone on the timescales considered.Changes in stratosphere-troposphere exchange, which are largely driven bymeteorological variability, are found to play a particularly importantrole in driving ozone changes. The strong influence of emissions on NO<sub>2</sub>and ozone interannual variability is largely confined to areas where intense biomass burningevents occur. For CO, interannual variability is almost solely driven byemission changes, while for OH meteorology dominates, with the radiativeinfluence of clouds being a very strong contributor. Through a simpleattribution analysis for 1996–2000 we conclude that changing cloudinessdrives 25% of the interannual variability of OH over Europe byaffecting shortwave radiation. Over Indonesia this figure is as high as 71%.Changes in cloudiness contribute a small but non-negligible amount (up to 6%) to the interannualvariability of ozone over Europe and Indonesia. This suggests that futureassessments of trends in tropospheric oxidizing capacity should account for interannual variabilityin cloudiness, a factor neglected in many previous studies

Interannual variability of tropospheric composition: the influence of changes in emissions, meteorology and clouds