Toward a Reanalysis of Stratospheric Ozone for Trend Studies: Assimilation of the Aura Microwave Limb Sounder and Ozone Mapping and Profiler Suite Limb Profiler Data

Wargan, Krzysztof; Kramarova, N. A.; Weir, Brad; Pawson, Steven; Davis, Sean

doi:10.1029/2019jd031892

Cited by 13 publications

(17 citation statements)

References 71 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…All observation error covariances were tuned using analysis diagnostics (Desrosiers et al, 2005). As in Wargan et al (2020) the wind, temperature, surface pressure, and tropospheric water vapor are replayed to the MERRA‐2 3‐hourly averaged assimilated fields (GMAO, 2015c) as described in Orbe et al (2017). Lawrence et al (2018) demonstrated that the reanalysis meteorology is suitable for polar processing studies.…”

Section: Methodsmentioning

confidence: 99%

“…The data assimilation system used in this work is the GEOS Constituent Data Assimilation System (GEOS CoDAS), a generalization of the carbon monoxide (Tangborn et al, 2009), carbon dioxide (Eldering et al, 2017;Tangborn et al, 2013), and ozone (Wargan et al, 2015(Wargan et al, , 2020 assimilation systems. This work applies GEOS CoDAS to a full stratospheric chemistry model, StratChem (Douglass et al, 1997;Kawa et al, 1995;Nielsen et al, 2017).…”

Section: Data Assimilation Systemmentioning

confidence: 99%

“…Further details of the StratChem model and its implementation in GEOS are provided in Nielsen et al (2017). The same version of GEOS CoDAS was used by Wargan et al (2020), where it was limited to assimilating ozone only. Here, the major advance in GEOS CoDAS is the ability to analyze a collection of constituents defined at run time and has been applied to the additional species HCl, N 2 O, water vapor and HNO 3 .…”

Section: 1029/2020jd033335mentioning

confidence: 99%

See 2 more Smart Citations

The Anomalous 2019 Antarctic Ozone Hole in the GEOS Constituent Data Assimilation System With MLS Observations

et al. 2020

Self Cite

View full text Add to dashboard Cite

A rare disturbance of the stratospheric Antarctic polar vortex in September 2019 led to a significantly higher than usual polar total ozone column. We use assimilation of ozone, HCl, and N 2 O data from the Microwave Limb Sounder with the Global Earth Observing System (GEOS) Constituent Data Assimilation System driven by reanalysis meteorology to study the evolution of the 2019 Antarctic polar ozone. We find that the maximum 2019 ozone hole area was near 10 × 10 6 km 2 , and as little as 20% of that in 2018 in mid-September. However, the magnitude of vortex-averaged chemical ozone depletion was not significantly different between the 2 years despite earlier chlorine deactivation in 2019. The assimilation results show that most of the differences between 2018 and 2019 Antarctic ozone resulted from two factors: (1) the geometry of the 2019 vortex, with ozone-rich middle-stratospheric air masses overlying the lower portion of the vortex and leading to a significant reduction of the total column, and (2) significantly reduced vortex volume. The anomalously small ozone hole of 2019 was comparable in size to the record breaking 2002 case and the mechanisms responsible were similar in the two cases. While the 2019 sudden stratospheric warming is classified as minor, its impact on ozone was very significant. Plain Language Summary A significant dynamical disturbance of the stratospheric polar vortex occurred over Antarctica in September 2019. Named sudden stratospheric warmings (SSWs), such events are relatively common in the Northern Hemisphere but exceedingly rare over the southern high latitudes. SSWs are known to disturb the chemical composition of the polar vortex, which slows down the reactions that lead to ozone depletion. In this paper we use observations of chemical composition of the 2019 Antarctic polar vortex from National Aeronautics and Space Administration (NASA)'s satellite sensor, the Microwave Limb Sounder, combined with a Global Earth Observing System model simulation to study the chemistry and dynamics of this unusual polar winter/spring season. We show that the 2019 SSW, although not classified as "major," led to more than a 50% reduction of the ozone hole area at its peak extent, compared to other years since 2004. Furthermore, we demonstrate that most of this reduction was caused by an unusual geometry and small size of the polar vortex, while the chemistry of the 2019 ozone hole was comparable to that in the undisturbed year 2018. The 2019 event can be regarded as an example of a minor sudden stratospheric warming with a major impact.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Data Assimilation Systemmentioning

confidence: 99%

Section: 1029/2020jd033335mentioning

confidence: 99%

See 1 more Smart Citation

The Anomalous 2019 Antarctic Ozone Hole in the GEOS Constituent Data Assimilation System With MLS Observations

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Currently, there is no chemical coupling between GOCART and GEOS-Chem, and no observations are directly assimilated into GEOS-CF. However, stratospheric O 3 in GEOS-Chem is nudged toward O 3 produced by GEOS FP, which is constrained by ozone measurements from the Microwave Limb Sounder (MLS), Ozone Monitoring Instrument (OMI), and NA-SA's Ozone Mapping and Profiler Suite (OMPS) and produces a realistic analysis of O 3 in the stratosphere (Wargan et al, 2015(Wargan et al, , 2020. In addition, near real-time MODIS observations of fire radiative power are used to constrain fire emissions, as produced by the Quick Fire Emissions Dataset (QFED) (Darmenov and Da Silva, 2015).…”

Section: General Descriptionmentioning

confidence: 99%

Description of the NASA GEOS Composition Forecast Modeling System GEOS‐CF v1.0

Keller

Knowland

Duncan

et al. 2021

J Adv Model Earth Syst

Self Cite

101

View full text Add to dashboard Cite

show abstract

“…The stratospheric column is then subtracted from EPIC TOZ to obtain tropospheric column ozone. Limb sounders like Aura MLS and OMPS LP have dense samplings and provide an accurate estimate of stratospheric ozone with high vertical resolution (e.g., Hubert et al, 2016;Kramarova et al, 2018;Wargan et al, 2020). These sounders are flown on polarorbiting satellites and make measurements at the same local solar time with ∼14 orbits a day.…”

Section: Epic Tropospheric Ozone Algorithmmentioning

confidence: 99%

Evaluation of Version 3 Total and Tropospheric Ozone Columns From Earth Polychromatic Imaging Camera on Deep Space Climate Observatory for Studying Regional Scale Ozone Variations

Kramarova

Ziemke

Huang

et al. 2021

Front. Remote Sens.

Self Cite

View full text Add to dashboard Cite

Discrete wavelength radiance measurements from the Deep Space Climate Observatory (DSCOVR) Earth Polychromatic Imaging Camera (EPIC) allows derivation of global synoptic maps of total and tropospheric ozone columns every hour during Northern Hemisphere (NH) Summer or 2 hours during Northern Hemisphere winter. In this study, we present version 3 retrieval of Earth Polychromatic Imaging Camera ozone that covers the period from June 2015 to the present with improved geolocation, calibration, and algorithmic updates. The accuracy of total and tropospheric ozone measurements from EPIC have been evaluated using correlative satellite and ground-based total and tropospheric ozone measurements at time scales from daily averages to monthly means. The comparisons show good agreement with increased differences at high latitudes. The agreement improves if we only accept retrievals derived from the EPIC 317 nm triplet and limit solar zenith and satellite looking angles to 70°. With such filtering in place, the comparisons of EPIC total column ozone retrievals with correlative satellite and ground-based data show mean differences within ±5-7 Dobson Units (or 1.5–2.5%). The biases with other satellite instruments tend to be mostly negative in the Southern Hemisphere while there are no clear latitudinal patterns in ground-based comparisons. Evaluation of the EPIC ozone time series at different ground-based stations with the correlative ground-based and satellite instruments and ozonesondes demonstrated good consistency in capturing ozone variations at daily, weekly and monthly scales with a persistently high correlation (r2 > 0.9) for total and tropospheric columns. We examined EPIC tropospheric ozone columns by comparing with ozonesondes at 12 stations and found that differences in tropospheric column ozone are within ±2.5 DU (or ∼±10%) after removing a constant 3 DU offset at all stations between EPIC and sondes. The analysis of the time series of zonally averaged EPIC tropospheric ozone revealed a statistically significant drop of ∼2–4 DU (∼5–10%) over the entire NH in spring and summer of 2020. This drop in tropospheric ozone is partially related to the unprecedented Arctic stratospheric ozone losses in winter-spring 2019/2020 and reductions in ozone precursor pollutants due to the COVID-19 pandemic.

show abstract

Toward a Reanalysis of Stratospheric Ozone for Trend Studies: Assimilation of the Aura Microwave Limb Sounder and Ozone Mapping and Profiler Suite Limb Profiler Data

Cited by 13 publications

References 71 publications

The Anomalous 2019 Antarctic Ozone Hole in the GEOS Constituent Data Assimilation System With MLS Observations

The Anomalous 2019 Antarctic Ozone Hole in the GEOS Constituent Data Assimilation System With MLS Observations

Description of the NASA GEOS Composition Forecast Modeling System GEOS‐CF v1.0

Evaluation of Version 3 Total and Tropospheric Ozone Columns From Earth Polychromatic Imaging Camera on Deep Space Climate Observatory for Studying Regional Scale Ozone Variations

Contact Info

Product

Resources

About