Jump to main content
US EPA
United States Environmental Protection Agency
Search
Search
Main menu
Environmental Topics
Laws & Regulations
About EPA
Health & Environmental Research Online (HERO)
Contact Us
Print
Feedback
Export to File
Search:
This record has one attached file:
Add More Files
Attach File(s):
Display Name for File*:
Save
Citation
Tags
HERO ID
1509367
Reference Type
Journal Article
Title
Variations of OH radical in an urban plume inferred from NO 2 column measurements
Author(s)
Valin, LC; Russell, AR; Cohen, RC
Year
2013
Is Peer Reviewed?
Yes
Journal
Geophysical Research Letters
ISSN:
0094-8276
EISSN:
1944-8007
Volume
40
Issue
9
Page Numbers
1856-1860
Language
English
DOI
10.1002/grl.50267
Web of Science Id
WOS:000320317500034
URL
http://doi.wiley.com/10.1002/grl.50267
Exit
Abstract
The evolution of atmospheric composition downwind of a city depends strongly on the concentration of OH within the plume. We use space-based observations of NO2, a molecule that affects both the sources and sinks of OH, to examine the functional dependence of OH concentration on the speed of the wind over Riyadh, Saudi Arabia. These observations illustrate the nonlinear dependence of the OH concentration on NO2 and on the rate of atmospheric mixing. We derive a range of NOx lifetimes of 5.5-8.0 h, lifetimes that correspond to an effective plume-averaged OH concentration of 7.6 x 106 molecules cm(-3) at fast (26 km h(-1)) and 5.2 x 10(6) molecules cm(-3) at slow (4 km h(-1)) wind speeds.
Tags
•
ISA-NOx (2016)
Cited
1st Draft
Atmospheric Science
2nd Draft
Final
Final Cited
Home
Learn about HERO
Using HERO
Search HERO
Projects in HERO
Risk Assessment
Transparency & Integrity