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

Gregory S. Jenkins, Moussa Gueye, Mamadou S. Drame, Seydi A. Ndiaye

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

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 (50-100ppb) in the 400-200hPa 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.

Original languageEnglish (US)
Pages (from-to)195-203
Number of pages9
JournalAtmospheric Science Letters
Volume15
Issue number3
DOIs
StatePublished - 2014

All Science Journal Classification (ASJC) codes

  • Atmospheric Science

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