Regional Modelling of Tropospheric Ozone Distribution and Budgets

1997 ◽  
pp. 37-57 ◽  
Author(s):  
Adolf Ebel ◽  
M. Memmesheimer ◽  
H. J. Jakobs
Keyword(s):  
Tropospheric Ozone ◽  
Regional Modelling ◽  
Ozone Distribution

scholarly journals Tropospheric ozone over Equatorial Africa: regional aspects from the MOZAIC data

2004 ◽  
Vol 4 (3) ◽  
pp. 3285-3332 ◽  
Author(s):  
B. Sauvage ◽  
V. Thouret ◽  
J.-P. Cammas ◽  
F. Gheusi ◽  
G. Athier ◽  
...  
Keyword(s):  
Biomass Burning ◽  
Tropospheric Ozone ◽  
Central Africa ◽  
Lower Troposphere ◽  
Boreal Summer ◽  
Boreal Winter ◽  
Vertical Profiles ◽  
Middle Troposphere ◽  
Ozone Distribution ◽  
Equatorial Africa

Abstract. We analyze MOZAIC ozone observations recorded over Equatorial Africa, from April 1997 to March 2003 to give the first ozone climatology of this region. The monthly mean vertical profiles have been systematically analyzed with monthly mean ECMWF data using a Lagrangian-model (LAGRANTO). We assess the roles played by the dynamical features of Equatorial Africa and the intense biomass burning sources within the region in defining the ozone distribution. The lower troposphere exhibits layers of enhanced ozone during the biomass burning season in each hemisphere (boreal winter in the northern tropics and boreal summer in the southern tropics). The monthly mean vertical profiles of ozone are clearly influenced by the local dynamical situation. Over the Gulf of Guinea during boreal winter, the ozone profile is characterized by systematically high ozone below 650 hPa. This is due to the high stability caused by the Harmattan winds in the lower troposphere and the blocking Saharan anticyclone in the middle troposphere that prevents any efficient vertical mixing. In contrast, Central African enhancements are not only found in the lower troposphere but throughout the troposphere. The boreal summer ozone maximum in the lower troposphere of Central Africa continues up to November in the middle troposphere due to the influx of air masses laden with biomass burning products from Brazil and Southern Africa. Despite its southern latitude, Central Africa during the boreal winter is also under the influence of the northern tropical fires. This phenomenon is known as the "ozone paradox". However, the tropospheric ozone columns calculated from the MOZAIC data give evidence that the Tropical Tropospheric Ozone Column (TTOC) maximum over Africa swings from West Africa in DJF to Central Africa in JJA. This contrasts with studies based on TOMS satellite data. A rough assessment of the regional ozone budget shows that the northern tropics fires in boreal winter might contribute up to 20% of the global photochemical ozone production. This study gives the first detailed picture of the ozone distribution over Equatorial Africa that should be used to validate both global models over this region and future satellite products.

scholarly journals A Model and Satellite-Based Analysis of the Tropospheric Ozone Distribution in Clear Versus Convectively Cloudy Conditions

2017 ◽  
Vol 122 (21) ◽  
pp. 11,948-11,960 ◽  
Author(s):  
Sarah A. Strode ◽  
Anne R. Douglass ◽  
Jerald R. Ziemke ◽  
Michael Manyin ◽  
J. Eric Nielsen ◽  
...  
Keyword(s):  
Tropospheric Ozone ◽  
Ozone Distribution

scholarly journals The influence of boreal biomass burning emissions on the distribution of tropospheric ozone over North America and the North Atlantic during 2010

2012 ◽  
Vol 12 (4) ◽  
pp. 2077-2098 ◽  
Author(s):  
M. Parrington ◽  
P. I. Palmer ◽  
D. K. Henze ◽  
D. W. Tarasick ◽  
E. J. Hyer ◽  
...  
Keyword(s):  
North America ◽  
Biomass Burning ◽  
North Atlantic ◽  
Tropospheric Ozone ◽  
Free Troposphere ◽  
Scaling Factors ◽  
The North ◽  
Ozone Distribution ◽  
The North Atlantic ◽  
Satellite Instruments

Abstract. We have analysed the sensitivity of the tropospheric ozone distribution over North America and the North Atlantic to boreal biomass burning emissions during the summer of 2010 using the GEOS-Chem 3-D global tropospheric chemical transport model and observations from in situ and satellite instruments. We show that the model ozone distribution is consistent with observations from the Pico Mountain Observatory in the Azores, ozonesondes across Canada, and the Tropospheric Emission Spectrometer (TES) and Infrared Atmospheric Sounding Instrument (IASI) satellite instruments. Mean biases between the model and observed ozone mixing ratio in the free troposphere were less than 10 ppbv. We used the adjoint of GEOS-Chem to show the model ozone distribution in the free troposphere over Maritime Canada is largely sensitive to NOx emissions from biomass burning sources in Central Canada, lightning sources in the central US, and anthropogenic sources in the eastern US and south-eastern Canada. We also used the adjoint of GEOS-Chem to evaluate the Fire Locating And Monitoring of Burning Emissions (FLAMBE) inventory through assimilation of CO observations from the Measurements Of Pollution In The Troposphere (MOPITT) satellite instrument. The CO inversion showed that, on average, the FLAMBE emissions needed to be reduced to 89% of their original values, with scaling factors ranging from 12% to 102%, to fit the MOPITT observations in the boreal regions. Applying the CO scaling factors to all species emitted from boreal biomass burning sources led to a decrease of the model tropospheric distributions of CO, PAN, and NOx by as much as −20 ppbv, −50 pptv, and −20 pptv respectively. The modification of the biomass burning emission estimates reduced the model ozone distribution by approximately −3 ppbv (−8%) and on average improved the agreement of the model ozone distribution compared to the observations throughout the free troposphere, reducing the mean model bias from 5.5 to 4.0 ppbv for the Pico Mountain Observatory, 3.0 to 0.9 ppbv for ozonesondes, 2.0 to 0.9 ppbv for TES, and 2.8 to 1.4 ppbv for IASI.

Influence of Biomass Burning in Southeast Asia on the Lower Tropospheric Ozone Distribution Over South China

2004 ◽  
Vol 47 (5) ◽  
pp. 869-877 ◽  
Author(s):  
Yong-Guang ZHENG ◽  
Pei-Jun ZHU ◽  
C Y CHAN ◽  
L Y CHAN ◽  
Hong CUI ◽  
...  
Keyword(s):  
Southeast Asia ◽  
Biomass Burning ◽  
South China ◽  
Tropospheric Ozone ◽  
Ozone Distribution

scholarly journals Long-term trend of surface ozone at a regional background station in eastern China 1991–2006: enhanced variability

2008 ◽  
Vol 8 (10) ◽  
pp. 2595-2607 ◽  
Author(s):  
X. Xu ◽  
W. Lin ◽  
T. Wang ◽  
P. Yan ◽  
J. Tang ◽  
...  
Keyword(s):  
Ozone Concentration ◽  
Tropospheric Ozone ◽  
Surface Ozone ◽  
Eastern China ◽  
Diurnal Variations ◽  
Concentration Increase ◽  
Ozone Distribution ◽  
Regional Background ◽  
Long Term Trends

Abstract. Information about the long-term trends of surface and tropospheric ozone is important for assessing the impact of ozone on human health, vegetation, and climate. Long-term measurements from East Asia, especially China's eastern provinces, are urgently needed to evaluate potential changes of tropospheric ozone over this economically rapid developing region. In this paper, surface ozone data from the Linan Regional Background Station in eastern China are analyzed and results about the long-term trends of surface ozone at the station are presented. Surface ozone data were collected at Linan during 6 periods between August 1991 and July 2006. The seasonality and the long-term changes of surface ozone at the site are discussed, with focus on changes in the diurnal variations, the extreme values, and the ozone distribution. Some long-term trends of surface ozone, e.g. decrease in the average concentration, increase in the daily amplitude of the relative diurnal variations, increase in the monthly highest 5% of the ozone concentration, decrease in the monthly lowest 5% of the ozone concentration, increase in the frequencies at the high and low ends of the ozone distribution have been uncovered by the analysis. All the trends indicate that the variability of surface ozone has been enhanced. Possible causes for the observed trends are discussed. The most likely cause is believed to be the increase of NOx concentration.

Tropospheric Ozone: Distribution and Sources

1994 ◽  
pp. 169-231 ◽  
Author(s):  
Fred C. Fehsenfeld ◽  
Shaw C. Liu
Keyword(s):  
Tropospheric Ozone ◽  
Ozone Distribution

scholarly journals Long-term trend of surface ozone at a regional background station in eastern China 1991–2006: enhanced variability

2008 ◽  
Vol 8 (1) ◽  
pp. 215-243 ◽  
Author(s):  
X. Xu ◽  
W. Lin ◽  
T. Wang ◽  
P. Yan ◽  
J. Tang ◽  
...  
Keyword(s):  
Ozone Concentration ◽  
Tropospheric Ozone ◽  
Surface Ozone ◽  
Eastern China ◽  
Diurnal Variations ◽  
Concentration Increase ◽  
Ozone Distribution ◽  
Regional Background ◽  
Long Term Trends

Abstract. Information about the long-term trends of surface and tropospheric ozone is important for assessing the impact of ozone on human health, vegetation, and climate. Long-term measurements from East Asia, especially China's eastern provinces, are urgently needed to evaluate potential changes of tropospheric ozone over this economically rapid developing region. In this paper, surface ozone data from the Linan Regional Background Station in eastern China are analyzed and results about the long-term trends of surface ozone at the station are presented. Surface ozone data were collected at Linan during 6 periods between August 1991 and July 2006. The seasonality and the long-term changes of surface ozone at the site are discussed, with focus on changes in the diurnal variations, the extreme values, and the ozone distribution. Some long-term trends of surface ozone, e.g., decrease in the average concentration, increase in the daily amplitude of the relative diurnal variations, increase in the monthly highest 5% of the ozone concentration, decrease in the monthly lowest 5% of the ozone concentration, increase in the frequencies at the high and low ends of the ozone distribution have been uncovered by the analysis. All the trends indicate that the variability of surface ozone has been enhanced. Possible causes for the observed trends are discussed. The most likely cause is believed to be the increase of NOx concentration.

Tropospheric Ozone: Distribution and Sources

1993 ◽  
pp. 169-231 ◽  
Author(s):  
Fred C. Fehsenfeld ◽  
Shaw C. Liu
Keyword(s):  
Tropospheric Ozone ◽  
Ozone Distribution

Meridional tropospheric ozone distribution north of 50° from airplane measurements

1973 ◽  
Vol 106-108 (1) ◽  
pp. 1041-1043 ◽  
Author(s):  
W. Bischof ◽  
P. Fabian
Keyword(s):  
Tropospheric Ozone ◽  
Ozone Distribution
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