Tropospheric column ozone response to ENSO in GEOS-5 assimilation of OMI and MLS ozone data

摘要: Abstract. We use GEOS-5 analyses of Ozone Monitoring Instrument (OMI) and Microwave Limb Sounder (MLS) ozone observations to investigate the magnitude spatial distribution El Nino Southern Oscillation (ENSO) influence on tropospheric column (TCO) into middle latitudes. This study provides first explicit spatially resolved characterization ENSO demonstrates coherent patterns teleconnections impacting TCO in extratropics. The response is evaluated characterized by both variance explained sensitivity 3.4 index. tropics agrees well with previous studies verifies analyses. A two-lobed symmetric about Equator western Pacific/Indonesian region seen some prior not others confirmed here. consistent large-scale vertical transport. also find that transport dominates compared small-scale convective weaker latitudes, but a significant found over several small regions, including central United States. However, index statistically large area maxima minima coincide anomalous anti-cyclonic cyclonic circulations where associated sign sensitivity. Also, related changes mean tropopause height can contribute significantly midlatitude response. Comparisons 22-year chemical model simulation demonstrate these results from 9-year assimilation are representative longer term. investigation brings insight seemingly disparate