Enhancement and depletion of lower/middle tropospheric ozone in Senegal during pre-monsoon and monsoon periods of summer 2008: observations and model results
Item
Title (Dublin Core)
Enhancement and depletion of lower/middle tropospheric ozone in Senegal during pre-monsoon and monsoon periods of summer 2008: observations and model results
Description (Dublin Core)
During the summer (8 June through 3 September) of 2008, nine ozonesondes are launched from Dakar, Senegal (14.75° N, 17.49° W) to investigate the impact of the Saharan Dust Layer (SAL) on ozone (O<sub>3</sub>) concentrations in the lower troposphere. Results during June (pre-monsoon period) show a reduction in O<sub>3</sub>, especially in the 850–700 hPa layer with SAL events. However, O<sub>3</sub> concentrations are increased in the 950–900 hPa layer where the peak of the inversion is found and presumably the highest dust concentrations. We use the WRF-CHEM model to explore the causes of elevated O<sub>3</sub> concentrations that appear to have a stratospheric contribution. During July and August (monsoon period), with the exception of one SAL outbreak, vertical profiles of O<sub>3</sub> are well mixed with concentrations not exceeding 55 ppb between the surface and 550 hPa. In the transition period between 26 June and 2 July lower tropospheric (925–600 hPa) O<sub>3</sub> concentrations are likely enhanced by enhanced biogenic NO<sub>x</sub> emissions from the Saharan desert and Sahelian soils following several rain events on 28 June and 1 July.
Creator (Dublin Core)
Jenkins, G. S.
Ndiaye, S.
Gueye, M.
Fitzhugh, R.
Smith, J. W.
Kebe, A.
Date (Dublin Core)
2018-08-10
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acpd-11-7155-2011
https://acp.copernicus.org/preprints/acp-2010-902/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
