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The Annual Cycle of Hydrogen Peroxide: is it an Indicator of Chemical Instability? : Volume 4, Issue 2 (06/04/2004)

By Stewart, R. W.

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Book Id: WPLBN0003997558
Format Type: PDF Article :
File Size: Pages 35
Reproduction Date: 2015

Title: The Annual Cycle of Hydrogen Peroxide: is it an Indicator of Chemical Instability? : Volume 4, Issue 2 (06/04/2004)  
Author: Stewart, R. W.
Volume: Vol. 4, Issue 2
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2004
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Stewart, R. W. (2004). The Annual Cycle of Hydrogen Peroxide: is it an Indicator of Chemical Instability? : Volume 4, Issue 2 (06/04/2004). Retrieved from http://www.ebooklibrary.org/


Description
Description: NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA. A box model has been used to study the annual cycle in hydrogen peroxide concentrations with the objective of determining whether the observed difference in summer and winter values reflects instability in the underlying photochemistry. The model is run in both steady-state and time-dependent modes. The steady-state calculations show that, for some range of NOx background levels, two stable solutions to the continuity equations exist for a period of days in spring and fall. The corresponding time-dependent model indicates that, for sufficiently high background NOx concentrations, the spring and fall changes in H2O2 concentration may be interpreted as a forced transition between the two underlying stable regimes. The spring transition is more rapid than that in fall, an asymmetry that becomes more marked as background NOx increases. This asymmetry is related to the different time scales involved in chemical production and loss of H2O2. Observations of the spring increase in H2O2 concentration may therefore provide a better measure of the change in the underlying chemical regime than does the fall decrease.

Summary
The annual cycle of hydrogen peroxide: is it an indicator of chemical instability?

 

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