|
|
 |
|
Darin Toohey with the University of Colorado |
|
Date: August 22, 2003
Time: 2:00pm
Location: NIA, Rm 404
Speaker: Darin Toohey with the University of Colorado
Subject:* "The Role of Halogen Oxides in the Atmosphere - How Fast is `Fast?'"
Additonal Information:Presentation (PPT)
Halogen oxides (ClO and BrO) are known to react rapidly and catalytically with ozone, such that collectively they play an important role in determining the balance of ozone throughout the atmosphere. Throughout most of the stratosphere, halogen oxides reduce the steady-state abundance of ozone such that trends in chlorine and bromine source gases result in trends in ozone columns. In the winter polar regions, both in the stratosphere and the troposphere, halogen oxides rapidly destroy ozone such that large gaps, or 'holes', can form within about a month in sprintime. Recent measurements in the plumes of rockets fueled by solid propellants show that the same ozone-destroying reactions can occur on timescales of minutes. In this talk I will review the characteristics of the specialized instruments used to obtain fast-response in situ measurements in these different atmospheric regimes and address the question "how fast is 'fast'", both in terms of the data rates necessary to resolve the variations in ozone and the halogen oxides and the rates at which reactions of ClO and BrO destroy ozone.
|
|
|
Home