Validation of Tropospheric Emission Spectrometer (TES) nadir ozone profiles using ozonesonde measurements

Nassar, Ray; Logan, Jennifer A.; Worden, H. M.; Megretskaia, I. A.; Bowman, K. W.; Osterman, G. B.; Thompson, A. M.; Tarasick, D. W.; Austin, S. A.; Claude, H.; Dubey, Manvendra K.; Hocking, W. K.; Johnson, B. J.; Joseph, Everette; Merrill, J. T.; Morris, Gary A.; Newchurch, M.; Oltmans, S. J.; Posny, Françoise; Schmidlin, F. J.; Vömel, H.; Whiteman, David N.; Witte, J. C.

doi:10.1029/2007jd008819

Cited by 194 publications

(229 citation statements)

References 37 publications

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“…TES ozone has been evaluated on a regular basis since the start of the mission in 2004, and compared against ozone-sonde measurements. For the previous version, Nassar et al (2008) indicate a positive bias comprised in the 3-10 ppbv range for the upper-troposphere and lower-stratosphere. For the most recent versions, Boxe et al (2010) indicate, for the high latitudes, a positive bias from the surface to the uppertroposphere, and a negative bias from the upper-troposphere to the lower-stratosphere.…”

Section: Tropospheric Compositionmentioning

confidence: 99%

Aerosol and ozone changes as forcing for climate evolution between 1850 and 2100

et al. 2012

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Global aerosol and ozone distributions and their associated radiative forcings were simulated between 1850 and 2100 following a recent historical emission dataset and under the representative concentration pathways (RCP) for the future. These simulations were used in an Earth System Model to account for the changes in both radiatively and chemically active compounds, when simulating the climate evolution. The past negative stratospheric ozone trends result in a negative climate forcing culminating at -0.15 W m -2 in the 1990s. In the meantime, the tropospheric ozone burden increase generates a positive climate forcing peaking at 0.41 W m -2 . The future evolution of ozone strongly depends on the RCP scenario considered. In RCP4.5 and RCP6.0, the evolution of both stratospheric and tropospheric ozone generate relatively weak radiative forcing changes until 2060-2070 followed by a relative 30 % decrease in radiative forcing by 2100. In contrast, RCP8.5 and RCP2.6 model projections exhibit strongly different ozone radiative forcing trajectories. In the RCP2.6 scenario, both effects (stratospheric ozone, a negative forcing, and tropospheric ozone, a positive forcing) decline towards 1950s values while they both get stronger in the RCP8.5 scenario. Over the twentieth century, the evolution of the total aerosol burden is characterized by a strong increase after World War II until the middle of the 1980s followed by a stabilization during the last decade due to the strong decrease in sulfates in OECD countries since the 1970s. The cooling effects reach their maximal values in 1980, with -0.34 and -0.28 W m -2 respectively for direct and indirect total radiative forcings. According to the RCP scenarios, the aerosol content, after peaking around 2010, is projected to decline strongly and monotonically during the twenty-first century for the RCP8.5, 4.5 and 2.6 scenarios. While for RCP6.0 the decline occurs later, after peaking around 2050. As a consequence the relative importance of the total cooling effect of aerosols becomes weaker throughout the twenty-first century compared with the positive forcing of greenhouse gases. Nevertheless, both surface ozone and aerosol content show very different regional features depending on the future scenario considered. Hence, in 2050, surface ozone changes vary between -12 and ?12 ppbv over Asia depending on the RCP projection, whereas the regional direct aerosol radiative forcing can locally exceed -3 W m -2 . This paper is a contribution to the special issue on the IPSL and CNRM global climate and Earth System Models, both developed in France and contributing to the 5th coupled model intercomparison project.Electronic supplementary material The online version of this article

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Section: Tropospheric Compositionmentioning

confidence: 99%

Aerosol and ozone changes as forcing for climate evolution between 1850 and 2100

et al. 2012

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“…We use version V002 of the data, which are filtered using the mean and root mean square of the radiance residual and on the cloud top pressure of each profile as recommended in the TES L2 Data User's Guide [TES Science Team, 2006]. These data have been validated by Nassar et al [2008] who estimate that the TES O 3 retrievals are biased high, in comparison to ozonesondes, by between 2.9 and 10.6 ppbv in the upper troposphere, and 3.7 and 9.2 ppbv in the lower troposphere. As given by Parrington et al [2008], the TES retrievals used in this analysis have peak sensitivity to tropospheric O 3 at 700 hPa and 400 hPa, which provides valuable constraints on free tropospheric O 3 .…”

Section: Tes Ozone Datamentioning

confidence: 99%

Impact of the assimilation of ozone from the Tropospheric Emission Spectrometer on surface ozone across North America

Parrington

Jones

Bowman

et al. 2009

Geophysical Research Letters

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We examine the impact of assimilating ozone observations from the Tropospheric Emission Spectrometer (TES) on North American surface ozone abundances in the GEOS‐Chem model in August 2006. The assimilation reduces the negative bias in the modeled free tropospheric ozone, which enhances the ozone flux into the boundary layer. Surface ozone abundances increased by as much as 9 ppb in western North America and by less than 2 ppb in the southeast, resulting in a total background source of ozone of 20–40 ppb. The enhanced ozone in the model reduced the model bias with respect to surface ozone observations in the western USA, but exacerbated it in the east. This increase in the bias in the boundary layer in the east, despite the agreement between the assimilation and ozonesonde measurements in the free troposphere, suggests errors in the ozone sources or sinks or in boundary layer mixing in the model.

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“…TES averaging kernels for retrievals above 300 mbar may have some influence from the stratosphere, and since we use the TES a priori for the stratosphere, we cannot be confident of the comparisons above this altitude. Our analysis will therefore be limited to altitudes below 300 mbar, validation of TES ozone above 300 mbar has been conducted using ozonesondes which show no significant bias [Nassar et al, 2008].…”

Section: Comparison Strategymentioning

confidence: 99%

“…Although ozonesondes are able to provide a measurement set which has a large geographical extent, the frequency of ozonesonde launches is quite low, and they are rarely timed to be coincident with satellite overpasses. Therefore, when using ozonesondes, long-timescale analyses and somewhat loose coincidence criteria are required to build sufficient statistics to make meaningful comparisons [Nassar et al, 2008]. Intensive aircraft measurement campaigns however are able to provide a set of high-frequency measurements which are targeted to be coincident with satellite overpasses, albeit on a limited spatial scale.…”

Section: Introductionmentioning

confidence: 99%

“…To date, TES tropospheric ozone validation has been conducted through comparisons with ozonesondes [Worden et al, 2007;Nassar et al, 2008], which are able to make in situ observations from the surface to the stratosphere. Although ozonesondes are able to provide a measurement set which has a large geographical extent, the frequency of ozonesonde launches is quite low, and they are rarely timed to be coincident with satellite overpasses.…”

Section: Introductionmentioning

confidence: 99%

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Validation of Tropospheric Emission Spectrometer ozone profiles with aircraft observations during the Intercontinental Chemical Transport Experiment–B

et al. 2008

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The Tropospheric Emission Spectrometer (TES) is an infrared instrument that was launched on board NASA's Aura satellite in 2004. TES is the first instrument to provide vertical information on tropospheric ozone while simultaneously measuring CO on a global basis. Before they may be used for scientific study, TES profiles must first be validated to determine if there are any systematic biases present. In this study we present a validation of TES tropospheric ozone using airborne differential absorption lidar (DIAL) profiles obtained during the Intercontinental Chemical Transport Experiment–B (INTEX‐B) campaign, which took place during March–May 2006. During INTEX‐B the NASA DC‐8 aircraft conducted several flights, which allowed the DIAL instrument to obtain ozone profile measurements that were spatially coincident with TES special observations in three different geographical regions. Here we present comparisons of TES and DIAL tropospheric ozone profiles that show that, on average, TES exhibits a small positive bias in the troposphere of 5–15%. We also examine the use of in situ profile observations for the validation of TES tropospheric ozone, and we find these to be of most use in clean regions where the background ozone field is homogeneous.

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Validation of Tropospheric Emission Spectrometer (TES) nadir ozone profiles using ozonesonde measurements

Cited by 194 publications

References 37 publications

Aerosol and ozone changes as forcing for climate evolution between 1850 and 2100

Aerosol and ozone changes as forcing for climate evolution between 1850 and 2100

Impact of the assimilation of ozone from the Tropospheric Emission Spectrometer on surface ozone across North America

Validation of Tropospheric Emission Spectrometer ozone profiles with aircraft observations during the Intercontinental Chemical Transport Experiment–B

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