edu.ucar.opensky::articles:14535 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-26T03:18:58.918193 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d70g3m5s Nighttime ozone variability in the high latitude winter mesosphere 2014-12-16T00:00:00Z publication https://n2t.org/ark:/85065/d70g3m5s https://doi.org/10.1002/2014JD021987 Smith, Anne K. author López-Puertas, M. author Funke, B. author García-Comas, M. author Mlynczak, M. author Holt, L. author UCAR/NCAR - Library publisher We use satellite observations and a numerical model to investigate polar nighttime ozone at the secondary maximum, around 90-95 km. Observations from the MIPAS and SABER satellite instruments indicate that the highest ozone mixing ratios are seen during the late fall to early winter period in both hemispheres and for all years examined. Simulations using the Whole Atmosphere Community Climate Model (WACCM) find qualitatively the same seasonal evolution. Analysis of WACCM results shows that the high ozone concentration is due in part to the relatively quiet dynamical conditions in early winter. The mean circulation, which brings warmer temperatures and higher concentrations of H, is weaker in early winter than during middle and late winter. H in the late fall to early winter period drops to the lowest levels seen during the year due to lack of a source from photochemistry, weak transport into the region by the mean circulation, and continual loss due to diffusive separation. The low concentration of H leads to higher ozone. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright 2014 American Geophysical Union. None eng geoscientificInformation