The influence of the SAL and lightning on tropospheric ozone variability over the Northern Tropical Atlantic

Results from Cape Verde during 2010

Gregory S. Jenkins, Miliaritiana L. Robjhon, Jonathan W. Smith, Jonathan Clark, Luis Mendes

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We present results for multiple Saharan Air Layer (SAL) events and their relationship to tropospheric ozone mixing ratios that were observed in the Eastern Atlantic during the summer of 2010 using ozonesondes. In particular, 5 SAL events are sampled during 2010 in Cape Verde indicting a reduction of ozone mixing ratios throughout much of the SAL layer, except near the base of the SAL. In this layer of enhanced ozone mixing ratio, we find increases of 20-30 ppb in some cases between non-SAL and SAL conditions. In addition, ozone concentrations are enhanced above the SAL layer, with trajectories suggesting enhancements by lightning from the middle/upper troposphere with outflow from Africa. Additional aircraft measurements are required to examine the chemical and aerosol distributions from the Marine Boundary Layer (MBL) through the upper troposphere to determine the heterogeneous chemical processes related to reduced ozone mixing ratio, and further quantify elevated ozone mixing ratios at the base of the SAL and above the SAL.

Original languageEnglish (US)
Article numberL20810
JournalGeophysical Research Letters
Volume39
Issue number20
DOIs
StatePublished - Oct 28 2012

Fingerprint

Cape Verde
lightning
ozone
air
mixing ratios
mixing ratio
troposphere
tropospheric ozone
ozonesondes
ozonesonde
airborne survey
chemical process

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

@article{1cd9fa018c2947ad9f1719dfa923a0e0,
title = "The influence of the SAL and lightning on tropospheric ozone variability over the Northern Tropical Atlantic: Results from Cape Verde during 2010",
abstract = "We present results for multiple Saharan Air Layer (SAL) events and their relationship to tropospheric ozone mixing ratios that were observed in the Eastern Atlantic during the summer of 2010 using ozonesondes. In particular, 5 SAL events are sampled during 2010 in Cape Verde indicting a reduction of ozone mixing ratios throughout much of the SAL layer, except near the base of the SAL. In this layer of enhanced ozone mixing ratio, we find increases of 20-30 ppb in some cases between non-SAL and SAL conditions. In addition, ozone concentrations are enhanced above the SAL layer, with trajectories suggesting enhancements by lightning from the middle/upper troposphere with outflow from Africa. Additional aircraft measurements are required to examine the chemical and aerosol distributions from the Marine Boundary Layer (MBL) through the upper troposphere to determine the heterogeneous chemical processes related to reduced ozone mixing ratio, and further quantify elevated ozone mixing ratios at the base of the SAL and above the SAL.",
author = "Jenkins, {Gregory S.} and Robjhon, {Miliaritiana L.} and Smith, {Jonathan W.} and Jonathan Clark and Luis Mendes",
year = "2012",
month = "10",
day = "28",
doi = "10.1029/2012GL053532",
language = "English (US)",
volume = "39",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "American Geophysical Union",
number = "20",

}

The influence of the SAL and lightning on tropospheric ozone variability over the Northern Tropical Atlantic : Results from Cape Verde during 2010. / Jenkins, Gregory S.; Robjhon, Miliaritiana L.; Smith, Jonathan W.; Clark, Jonathan; Mendes, Luis.

In: Geophysical Research Letters, Vol. 39, No. 20, L20810, 28.10.2012.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The influence of the SAL and lightning on tropospheric ozone variability over the Northern Tropical Atlantic

T2 - Results from Cape Verde during 2010

AU - Jenkins, Gregory S.

AU - Robjhon, Miliaritiana L.

AU - Smith, Jonathan W.

AU - Clark, Jonathan

AU - Mendes, Luis

PY - 2012/10/28

Y1 - 2012/10/28

N2 - We present results for multiple Saharan Air Layer (SAL) events and their relationship to tropospheric ozone mixing ratios that were observed in the Eastern Atlantic during the summer of 2010 using ozonesondes. In particular, 5 SAL events are sampled during 2010 in Cape Verde indicting a reduction of ozone mixing ratios throughout much of the SAL layer, except near the base of the SAL. In this layer of enhanced ozone mixing ratio, we find increases of 20-30 ppb in some cases between non-SAL and SAL conditions. In addition, ozone concentrations are enhanced above the SAL layer, with trajectories suggesting enhancements by lightning from the middle/upper troposphere with outflow from Africa. Additional aircraft measurements are required to examine the chemical and aerosol distributions from the Marine Boundary Layer (MBL) through the upper troposphere to determine the heterogeneous chemical processes related to reduced ozone mixing ratio, and further quantify elevated ozone mixing ratios at the base of the SAL and above the SAL.

AB - We present results for multiple Saharan Air Layer (SAL) events and their relationship to tropospheric ozone mixing ratios that were observed in the Eastern Atlantic during the summer of 2010 using ozonesondes. In particular, 5 SAL events are sampled during 2010 in Cape Verde indicting a reduction of ozone mixing ratios throughout much of the SAL layer, except near the base of the SAL. In this layer of enhanced ozone mixing ratio, we find increases of 20-30 ppb in some cases between non-SAL and SAL conditions. In addition, ozone concentrations are enhanced above the SAL layer, with trajectories suggesting enhancements by lightning from the middle/upper troposphere with outflow from Africa. Additional aircraft measurements are required to examine the chemical and aerosol distributions from the Marine Boundary Layer (MBL) through the upper troposphere to determine the heterogeneous chemical processes related to reduced ozone mixing ratio, and further quantify elevated ozone mixing ratios at the base of the SAL and above the SAL.

UR - http://www.scopus.com/inward/record.url?scp=84868307706&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84868307706&partnerID=8YFLogxK

U2 - 10.1029/2012GL053532

DO - 10.1029/2012GL053532

M3 - Article

VL - 39

JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

IS - 20

M1 - L20810

ER -