Assessment and applications of NASA ozone data products derived from Aura OMI/MLS satellite measurements in context of the GMI chemical transport model

Ziemke, J. R.; Olsen, Mark A.; Witte, J. C.; Douglass, Anne R.; Strahan, S. E.; Wargan, Krzysztof; Liu, Xueliang; Schoeberl, M. R.; Yang, Kai; Kaplan, Trevor B.; Pawson, Steven; Duncan, B. N.; Newman, Paul A.; Bhartia, P. K.; Heney, M. K.

doi:10.1002/2013jd020914

Cited by 46 publications

(49 citation statements)

References 74 publications

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“…Their assessments show that accounting for measurement and model errors in the assimilation greatly increases the precision of the tropospheric ozone over other methods of obtaining gridded TCO fields. Both Wargan et al (2015) and Ziemke et al (2014) show that there is greater disagreement of the tropospheric ozone analyses with sondes at high latitudes. For this reason, we restrict our discussion in the present study to the tropics and middle latitudes.…”

Section: Ozone Data and Geos-5 Data Assimilation Systemmentioning

confidence: 98%

“…Wargan et al (2015) provides more details on the OMI tropospheric sensitivity and the retrieval "efficiency factors", or averaging kernels, used in the assimilation. Wargan et al (2015) and Ziemke et al (2014) previously evaluated these ozone analyses relative to sondes and other satellite data. Their assessments show that accounting for measurement and model errors in the assimilation greatly increases the precision of the tropospheric ozone over other methods of obtaining gridded TCO fields.…”

Section: Ozone Data and Geos-5 Data Assimilation Systemmentioning

confidence: 99%

“…Assimilation provides the advantages of global, gridded fields constrained by observations. Ziemke et al (2014) show that the ozone assimilation offers more robust tropospheric ozone fields for science applications in the lower and middle latitudes than residual methods. In the present study, the response in the tropics is evaluated and discussed alongside the midlatitude response.…”

Section: Introductionmentioning

confidence: 97%

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Tropospheric column ozone response to ENSO in GEOS-5 assimilation of OMI and MLS ozone data

2016

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Abstract. We use GEOS-5 analyses of Ozone Monitoring Instrument (OMI) and Microwave Limb Sounder (MLS) ozone observations to investigate the magnitude and spatial distribution of the El Niño Southern Oscillation (ENSO) influence on tropospheric column ozone (TCO) into the middle latitudes. This study provides the first explicit spatially resolved characterization of the ENSO influence and demonstrates coherent patterns and teleconnections impacting the TCO in the extratropics. The response is evaluated and characterized by both the variance explained and sensitivity of TCO to the Niño 3.4 index. The tropospheric response in the tropics agrees well with previous studies and verifies the analyses. A two-lobed response symmetric about the Equator in the western Pacific/Indonesian region seen in some prior studies and not in others is confirmed here. This two-lobed response is consistent with the large-scale vertical transport. We also find that the large-scale transport in the tropics dominates the response compared to the small-scale convective transport. The ozone response is weaker in the middle latitudes, but a significant explained variance of the TCO is found over several small regions, including the central United States. However, the sensitivity of TCO to the Niño 3.4 index is statistically significant over a large area of the middle latitudes. The sensitivity maxima and minima coincide with anomalous anti-cyclonic and cyclonic circulations where the associated vertical transport is consistent with the sign of the sensitivity. Also, ENSO related changes to the mean tropopause height can contribute significantly to the midlatitude response. Comparisons to a 22-year chemical transport model simulation demonstrate that these results from the 9-year assimilation are representative of the longer term. This investigation brings insight to several seemingly disparate prior studies of the El Niño influence on tropospheric ozone in the middle latitudes.

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Section: Ozone Data and Geos-5 Data Assimilation Systemmentioning

confidence: 98%

Section: Ozone Data and Geos-5 Data Assimilation Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

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Tropospheric column ozone response to ENSO in GEOS-5 assimilation of OMI and MLS ozone data

2016

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“…However, Fig. 12 of Ziemke et al (2014) showed that the assimilation product when limited to tropical latitudes had zonal variability ∼ 10-15 DU in stratospheric column ozone which was considerably larger than direct satellite measurements that typically have zonal variability of only a few DU. In addition, this larger zonal variability in stratospheric column ozone coincided with a reduced zonal wave-one pattern of TCO with assimilation, also considered inconsistent with previous TCO measurements.…”

Section: Data and Modelsmentioning

confidence: 89%

“…This method subtracts MLS stratospheric column ozone from OMI total column ozone for near clear-sky scenes (i.e., radiative cloud fractions < 30 %). Ziemke et al (2014) evaluated three other OMI/MLS TCO products and concluded that the Global Modeling and Assimilation Office (GMAO) data assimilation product was best to use overall when considering all factors including global coverage and ozone profile information. However, Fig.…”

Section: Data and Modelsmentioning

confidence: 99%

Tropospheric ozone variability in the tropics from ENSO to MJO and shorter timescales

et al. 2015

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Abstract. Aura OMI and MLS measurements are combined to produce daily maps of tropospheric ozone beginning October 2004. We show that El Niño-Southern Oscillation (ENSO) related inter-annual change in tropospheric ozone in the tropics is small in relation to combined intra-seasonal/Madden-Julian Oscillation (MJO) and shorter timescale variability by a factor of ∼ 3-10 (largest in the Atlantic). Outgoing longwave radiation (OLR), taken as a proxy for convection, suggests that convection is a dominant driver of large-scale variability of tropospheric ozone in the Pacific from inter-annual (e.g., ENSO) to weekly periods. We compare tropospheric ozone and OLR satellite observations with two simulations: (1) the Goddard Earth Observing System (GEOS) chemistry-climate model (CCM) that uses observed sea surface temperatures and is otherwise free-running, and (2) the NASA Global Modeling Initiative (GMI) chemical transport model (CTM) that is driven by Modern Era Retrospective-Analysis for Research and Applications (MERRA) analyses. It is shown that the CTM-simulated ozone accurately matches measurements for timescales from ENSO to intra-seasonal/MJO and even 1-2-week periods. The CCM simulation reproduces ENSO variability but not shorter timescales. These analyses suggest that a model used to delineate temporal and/or spatial properties of tropospheric ozone and convection in the tropics must reproduce both ENSO and non-ENSO variability.

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The global structure of upper troposphere‐lower stratosphere ozone in GEOS‐5: A multiyear assimilation of EOS Aura data

et al. 2015

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Eight years of ozone measurements retrieved from the Ozone Monitoring Instrument and the Microwave Limb Sounder, both on the EOS Aura satellite, have been assimilated into the Goddard Earth Observing System Version 5 (GEOS-5) data assimilation system. This study evaluates this assimilated product, highlighting its potential for science. The impact of observations on the GEOS-5 system is explored by examining the spatial distribution of the observation-minus-forecast statistics. Independent data are used for product validation. The correlation of the lower stratospheric (the tropopause to 50 hPa) ozone column with ozonesondes is 0.99 and the (high) bias is 0.5%, indicating the success of the assimilation in reproducing the ozone variability in that layer. The upper tropospheric (500 hPa to the tropopause) assimilated ozone column is about 10% lower than the ozonesonde column, but the correlation is still high (0.87). The assimilation is shown to realistically capture the sharp cross-tropopause gradient in ozone mixing ratio. Occurrence of transport-driven low ozone laminae in the assimilation system is similar to that obtained from the High Resolution Dynamics Limb Sounder (HIRDLS) above the 400 K potential temperature surface, but the assimilation produces fewer laminae than seen by HIRDLS below that surface. Although the assimilation produces about 25% fewer occurrences per day during the 3 years of HIRDLS data, the interannual variability is captured correctly. This data-driven assimilated product is complementary to ozone fields generated from chemistry and transport models. Applications include study of the radiative forcing by ozone and tracer transport near the tropopause.

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Assessment and applications of NASA ozone data products derived from Aura OMI/MLS satellite measurements in context of the GMI chemical transport model

Cited by 46 publications

References 74 publications

Tropospheric column ozone response to ENSO in GEOS-5 assimilation of OMI and MLS ozone data

Tropospheric column ozone response to ENSO in GEOS-5 assimilation of OMI and MLS ozone data

Tropospheric ozone variability in the tropics from ENSO to MJO and shorter timescales

The global structure of upper troposphere‐lower stratosphere ozone in GEOS‐5: A multiyear assimilation of EOS Aura data

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