Interrelated variations of O&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt;, CO and deep convection in the tropical/subtropical upper troposphere observed by the Aura Microwave Limb Sounder (MLS) during 2004–2011

Livesey, N. J.; Logan, Jennifer A.; Santee, M. L.; Waters, J. W.; Doherty, Ruth M.; Read, W. G.; Froidevaux, L.; Jiang, Jonathan H.

doi:10.5194/acp-13-579-2013

Cited by 41 publications

(45 citation statements)

References 80 publications

(94 reference statements)

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“…We ignore any measurements which may have been influenced by clouds through the recommended screening processes using the MLS data quality flags. Comparisons between MLS O 3 and ozonesondes show the best agreement (better than 10%) in the tropical upper troposphere at 215 hPa with small positive biases (<10 ppb over the Pacific) but indicate larger biases at other pressure levels [Livesey et al, 2012].…”

Section: Datamentioning

confidence: 90%

Analysis of satellite remote sensing observations of low ozone events in the tropical upper troposphere and links with convection

Cooper

Martin

Livesey

et al. 2013

Geophysical Research Letters

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[1] Satellite observations from three instruments (Microwave Limb Sounder, Optical Spectrograph and Infrared Imaging System, and Atmospheric Chemistry Experiment Fourier Transform Spectrometer) reveal coherent patterns of low ozone events (<20 ppb) in the tropical upper troposphere. Using a chemical transport model (GEOS-Chem), we find that these events result from deep convective processes that rapidly transport air with low ozone concentrations from the marine boundary layer. These events occur with greater frequency over the tropical South Pacific warm pool, which is consistent with ozonesonde observations. The satellite observations indicate spatial shifts in the frequency of low ozone events that we attribute to changes in convection. As the location of the warm pool shifts eastward during El Niño events, the location of the most frequent low ozone events in the satellite record follows. Mapping of low ozone events over time reveals eastward propagating systems resembling the Madden-Julian Oscillation. These observations and analyses strengthen the link between deep convection and ozone concentrations in the tropical upper troposphere.

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Section: Datamentioning

confidence: 90%

Analysis of satellite remote sensing observations of low ozone events in the tropical upper troposphere and links with convection

Cooper

Martin

Livesey

et al. 2013

Geophysical Research Letters

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“…Froidevaux et al (2008) compared the previous v2.2 MLS ozone retrievals with matching ozone data from ground-based and satellite observations and found that the differences are generally within 5 % in most of the stratosphere, although residuals of 10-20 % were found in the lower stratosphere. Livesey et al (2013) reports differences between the v3.3 and v2.2 MLS ozone profiles typically within 1-2 % in the stratosphere and lower mesosphere.…”

Section: Comparisons With Independent Datamentioning

confidence: 96%

A comparative analysis of UV nadir-backscatter and infrared limb-emission ozone data assimilation

Dragani

2016

Atmos. Chem. Phys.

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Abstract. This paper presents a comparative assessment of ultraviolet nadir-backscatter and infrared limb-emission ozone profile assimilation. The Meteorological Operational Satellite A (MetOp-A) Global Ozone Monitoring Experiment 2 (GOME-2) nadir and the ENVISAT Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) limb profiles, generated by the ozone consortium of the European Space Agency Climate Change Initiative (ESA O3-CCI), were individually added to a reference set of ozone observations and assimilated in the European Centre for MediumRange Weather Forecasts (ECMWF) data assimilation system (DAS). The two sets of resulting analyses were compared with that from a control experiment, only constrained by the reference dataset, and independent, unassimilated observations.Comparisons with independent observations show that both datasets improve the stratospheric ozone distribution. The changes inferred by the limb-based observations are more localized and, in places, more important than those implied by the nadir profiles, albeit they have a much lower number of observations. A small degradation (up to 0.25 mg kg −1 for GOME-2 and 0.5 mg kg −1 for MIPAS in the mass mixing ratio) is found in the tropics between 20 and 30 hPa. In the lowermost troposphere below its vertical coverage, the limb data are found to be able to modify the ozone distribution with changes as large as 60 %. Comparisons of the ozone analyses with sonde data show that at those levels the assimilation of GOME-2 leads to about 1 Dobson Unit (DU) smaller root mean square error (RMSE) than that of MIPAS. However, the assimilation of MIPAS can still improve the quality of the ozone analyses and -with a reduction in the RMSE of up to about 2 DU -outperform the control experiment thanks to its synergistic assimilation with totalcolumn ozone data within the DAS.High vertical resolution ozone profile observations are essential to accurately monitor and forecast ozone concentrations in a DAS. This study demonstrates the potential and limitations of each dataset and instrument type, as well as the need for a balanced future availability of nadir and limb sensors and long-term plans for limb-viewing instruments.

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“…2d), both CO emission and IWC anomalies are significantly correlated with UT CO anomaly (0.77 and −0.66, respectively), suggesting that both CO emission and convective transport are important in determining the interannual variation of UT CO over this region. The negative correlation between UT CO and IWC anomalies over this region is expected from the decrease of convection and increase of CO emission related to the intense drought-induced fires (e.g., Liu et al, 2013;Livesey et al, 2013). …”

Section: Regions Affecting Ut Co Interannual Variationmentioning

confidence: 99%

“…Duncan and Logan (2008) analyzed the factors that regulate the trends and interannual variability of tropospheric CO for 1988-1997 through a model study, and found the interannual variation of biomass burning, especially those major burning events in Indonesia associated with El Niño, is the main driver of large-scale CO variability in the tropics. Strong interannual variation of CO in the upper troposphere (UT) is found to be mainly related to the intense droughtinduced fires in Indonesia and South America (Liu et al, 2013;Livesey et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Impacts of fire emissions and transport pathways on the interannual variation of CO in the tropical upper troposphere

Huang

Jiang

2014

Atmos. Chem. Phys.

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Abstract. This study investigates the impacts of fire emission, convection, various climate conditions and transport pathways on the interannual variation of carbon monoxide (CO) in the tropical upper troposphere (UT), by evaluating the field correlation between these fields using multisatellite observations and principle component analysis, and the transport pathway auto-identification method developed in our previous study. The rotated empirical orthogonal function (REOF) and singular value decomposition (SVD) methods are used to identify the dominant modes of CO interannual variation in the tropical UT and to study the coupled relationship between UT CO and its governing factors. Both REOF and SVD results confirm that Indonesia is the most significant land region that affects the interannual variation of CO in the tropical UT, and El Niño-Southern Oscillation (ENSO) is the dominant climate condition that affects the relationships between surface CO emission, convection and UT CO. In addition, our results also show that the impact of El Niño on the anomalous CO pattern in the tropical UT varies strongly, primarily due to different anomalous emission and convection patterns associated with different El Niño events. In contrast, the anomalous CO pattern in the tropical UT during La Niña period appears to be less variable among different events. Transport pathway analysis suggests that the average CO transported by the "local convection" pathway ( CO local ) accounts for the differences of UT CO between different ENSO phases over the tropical continents during biomass burning season. CO local is generally higher over Indonesia-Australia and lower over South America during El Niño years than during La Niña years. The other pathway ("advection within the lower troposphere followed by convective vertical transport") occurs more frequently over the west-central Pacific during El Niño years than during La Niña years, which may account for the UT CO differences over this region between different ENSO phases.

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Interrelated variations of O<sub>3</sub>, CO and deep convection in the tropical/subtropical upper troposphere observed by the Aura Microwave Limb Sounder (MLS) during 2004–2011

Cited by 41 publications

References 80 publications

Analysis of satellite remote sensing observations of low ozone events in the tropical upper troposphere and links with convection

Analysis of satellite remote sensing observations of low ozone events in the tropical upper troposphere and links with convection

A comparative analysis of UV nadir-backscatter and infrared limb-emission ozone data assimilation

Impacts of fire emissions and transport pathways on the interannual variation of CO in the tropical upper troposphere

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