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Daily Ozone Cycle in the Stratosphere: Global, Regional and Seasonal Behaviour Modelled with the Whole Atmosphere Community Climate Model : Volume 14, Issue 5 (03/03/2014)

By Schanz, A.

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Book Id: WPLBN0003978573
Format Type: PDF Article :
File Size: Pages 49
Reproduction Date: 2015

Title: Daily Ozone Cycle in the Stratosphere: Global, Regional and Seasonal Behaviour Modelled with the Whole Atmosphere Community Climate Model : Volume 14, Issue 5 (03/03/2014)  
Author: Schanz, A.
Volume: Vol. 14, Issue 5
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Kämpfer, N., Hocke, K., & Schanz, A. (2014). Daily Ozone Cycle in the Stratosphere: Global, Regional and Seasonal Behaviour Modelled with the Whole Atmosphere Community Climate Model : Volume 14, Issue 5 (03/03/2014). Retrieved from http://www.ebooklibrary.org/


Description
Description: Institute of Applied Physics, Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland. The Whole Atmosphere Community Climate Model (WACCM) is utilised to study the daily ozone cycle and underlying photochemical and dynamical processes. The analysis is focused on the daily ozone cycle in the middle stratosphere at 5 hPa where satellite-based trend estimates of stratospheric ozone are most biased by diurnal sampling effects and drifting satellite orbits. The simulated ozone cycle shows a minimum after sunrise and a maximum in the late afternoon. Further, a seasonal variation of the daily ozone cycle in the stratosphere was found. Depending on season and latitude, the peak-to-valley difference of the daily ozone cycle varies mostly between 3–5% (0.4 ppmv) with respect to the midnight ozone volume mixing ratio. The maximal variation of 15% (0.8 ppmv) is found at the polar circle in summer. The global pattern of the strength of the daily ozone cycle is mainly governed by the solar zenith angle and the sunshine duration. In addition, we find synoptic scale variations in the strength of the daily ozone cycle. These variations are often anti-correlated to regional temperature anomalies and are due to the temperature dependence of the rate coefficients k2 and k3 of the Chapman cycle reactions. Further, the NOx catalytic cycle counteracts to the accumulation of ozone during daytime and leads to an anti-correlation between anomalies in NOx and the strength of the daily ozone cycle. Similarly, ozone recombines with atomic oxygen which leads to an anti-correlation between anomalies in ozone abundance and the strength of the daily ozone cycle. At higher latitudes, an increase of the westerly (easterly) wind cause a decrease (increase) in the sunshine duration of an air parcel leading to a weaker (stronger) daily ozone cycle.

Summary
Daily ozone cycle in the stratosphere: global, regional and seasonal behaviour modelled with the Whole Atmosphere Community Climate Model

Excerpt
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