Evidence of a LNOX influence on middle/upper troposphere ozone‐mixing ratios at Dakar, Senegal during Northern Hemisphere summer season

We present results for the vertical distribution of tropospheric ozone from 40 measurements at Dakar, Senegal (14.59°N, 17.5°W) from June to September of 2008, 2010, 2011 and 2012. Under pre‐monsoon conditions (June), many dry air intrusions are found in the lower troposphere transitioning to humid...

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Bibliographic Details
Published in:Atmospheric science letters 2014-07, Vol.15 (3), p.195-203
Main Authors: Jenkins, Gregory S., Gueye, Moussa, Drame, Mamadou S., Ndiaye, Seydi A.
Format: Article
Language:English
Subjects:
Atmospheric sciences
Biomass
Distribution
Dry air
Easterlies
Emission measurements
Lightning
Lower troposphere
middle troposphere
Mixing ratio
Northern Hemisphere
Ozone
Ozone mixing ratio
Senegal
Summer
Troposphere
Tropospheric ozone
Upper troposphere
Vertical distribution
Wind flow
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Summary:We present results for the vertical distribution of tropospheric ozone from 40 measurements at Dakar, Senegal (14.59°N, 17.5°W) from June to September of 2008, 2010, 2011 and 2012. Under pre‐monsoon conditions (June), many dry air intrusions are found in the lower troposphere transitioning to humid conditions during July, August and September. Measurements show the highest ozone‐mixing ratios (50–100 ppb) in the 400–200 hPa layer and easterly wind flow during each month. Lightning‐NOX (LNOX) is the only viable source to explain the vertical distribution of ozone, with a large amount of upstream lightning over West Africa during summer.
ISSN:1530-261X
1530-261X
DOI:10.1002/asl2.489