Overview of the EOS aura mission

Schoeberl, M. R.; Douglass, Anne R.; Hilsenrath, E.; Bhartia, P. K.; Beer, R.; Waters, J. W.; Gunson, M. R.; Froidevaux, L.; Gille, J. C.; Barnett, J. J.; Levelt, P. F.; DeCola, Phil

doi:10.1109/tgrs.2005.861950

Cited by 386 publications

(310 citation statements)

References 21 publications

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“…Aura (Schoeberl et al, 2006) was launched in July 2004, and the MLS instrument has operated with little interruption from August 2004 to date. The satellite orbits at an altitude of 705 km, performing approximately 14.5 orbits per day.…”

Section: The Mls Instrumentmentioning

confidence: 99%

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Observations of volcanic SO<sub>2</sub> from MLS on Aura

et al. 2015

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Abstract. Sulfur dioxide (SO 2 ) is an important atmospheric constituent, particularly in the aftermath of volcanic eruptions. These events can inject large amounts of SO 2 into the lower stratosphere, where it is oxidised to form sulfate aerosols; these in turn have a significant effect on the climate. The MLS instrument on the Aura satellite has observed the SO 2 mixing ratio in the upper troposphere and lower stratosphere from August 2004 to the present, during which time a number of volcanic eruptions have significantly affected those regions of the atmosphere. We describe the MLS SO 2 data and how various volcanic events appear in the data. As the MLS SO 2 data are currently not validated we take some initial steps towards their validation. First we establish the level of internal consistency between the three spectral regions in which MLS is sensitive to SO 2 . We compare SO 2 column values calculated from MLS data to total column values reported by the OMI instrument. The agreement is good (within about 1 DU) in cases where the SO 2 is clearly at altitudes above 147 hPa.

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Section: The Mls Instrumentmentioning

confidence: 99%

“…The Microwave Limb Sounder, or MLS , is one of the four instruments on NASA's Aura satellite (Schoeberl et al, 2006). MLS measures the concentra-tions of a suite of 14 chemical species in the upper troposphere and middle atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Observations of volcanic SO<sub>2</sub> from MLS on Aura

et al. 2015

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“…The Aura satellite [Schoeberl et al, 2006] passes over the equator in a sun-synchronous ascending polar orbit at 13:45 local time and over North America around 13:00 local time. We use the OMI standard product (Version 1.0.5, Collection 3) available from the NASA Goddard Earth Sciences (GES) Data Active Archive Center (http://disc.sci.gsfc.nasa.gov/data/datapool/OMI/).…”

Section: Omi Tropospheric No 2 Columnsmentioning

confidence: 99%

Ground‐level nitrogen dioxide concentrations inferred from the satellite‐borne Ozone Monitoring Instrument

et al. 2008

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[1] We present an approach to infer ground-level nitrogen dioxide (NO 2 ) concentrations by applying local scaling factors from a global three-dimensional model (GEOS-Chem) to tropospheric NO 2 columns retrieved from the Ozone Monitoring Instrument (OMI) onboard the Aura satellite. Seasonal mean OMI surface NO 2 derived from the standard tropospheric NO 2 data product (Version 1.0.5, Collection 3) varies by more than two orders of magnitude (<0.1->10 ppbv) over North America. Two ground-based data sets are used to validate the surface NO 2 estimate and indirectly validate the OMI tropospheric NO 2 retrieval: photochemical steady-state (PSS) calculations of NO 2 based on in situ NO and O 3 measurements, and measurements from a commercial chemiluminescent NO 2 analyzer equipped with a molybdenum converter. An interference correction algorithm for the latter is developed using laboratory and field measurements and applied using modeled concentrations of the interfering species. The OMI-derived surface NO 2 mixing ratios are compared with an in situ surface NO 2 data obtained from the U.S. Environmental Protection Agency's Air Quality System (AQS) and Environment Canada's National Air Pollution Surveillance (NAPS) network for 2005 after correcting for the interference in the in situ data. The overall agreement of the OMI-derived surface NO 2 with the corrected in situ measurements and PSS-NO 2 is À11-36%. A larger difference in winter/spring than in summer/fall implies a seasonal bias in the OMI NO 2 retrieval. The correlation between the OMI-derived surface NO 2 and the ground-based measurements is significant (correlation coefficient up to 0.86) with a tendency for higher correlations in polluted areas. The satellite-derived data base of ground level NO 2 concentrations could be valuable for assessing exposures of humans and vegetation to NO 2 , supplementing the capabilities of the ground-based networks, and evaluating air quality models and the effectiveness of air quality control strategies.Citation: Lamsal, L. N., R.

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“…[4] The purpose of this study is a comparison of the ozone vertical profiles inferred from the Umkehr measurements taken at Belsk observatory with collocated satellite profiles derived from measurements by the Earth Observing System (EOS) Microwave Limb Sounder (MLS) instrument, which inspects thermal emissions lines from many trace gases at microwave wavelengths [Schoeberl et al 2006;Froidevaux et al 2006;Livesey et al, 2006;Waters et al, 2006]. The MLS data used for this comparison are taken from the Aura Validation Data Center (AVDC).…”

Section: Introductionmentioning

confidence: 99%

Comparison of ozone profiles by the Umkehr measurements taken at Belsk (52°N, 21°E) with the Aura Microwave Limb Sounder overpasses: 2004–2006

et al. 2008

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[1] A comparison of ozone profile measurements by the Umkehr observations taken at Belsk (52°N, 21°E) by the Dobson spectrophotometer and collocated Earth Observing System (EOS) Microwave Limb Sounder (MLS) aboard the Aura platform during 2004-2006 site overpasses is presented. The MLS ozone vertical profiles from 1.5 and 2.2 retrieval algorithms and various Umkehr retrievals are considered. There is a good agreement between the ozone content in Umkehr layers. The mean difference $ ±5%, standard deviation of the relative differences < 10%, and the correlation coefficient > 0.5 are found in the midstratosphere (Umkehr layers 5-7) and in the upper stratosphere (combined layers 8, 9, and 10). In the lower stratosphere (combined layers 2 and 3 and layer 4) the mean difference and/or standard deviation are larger but the correlation coefficient is still high ($0.8). Ozone content in Umkehr layers by integration of MLS version 1.5 and 2.2 ozone mixing ratio profiles behaves very similarly in the comparisons with the ground-based data.

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Overview of the EOS aura mission

Cited by 386 publications

References 21 publications

Observations of volcanic SO<sub>2</sub> from MLS on Aura

Observations of volcanic SO<sub>2</sub> from MLS on Aura

Ground‐level nitrogen dioxide concentrations inferred from the satellite‐borne Ozone Monitoring Instrument

Comparison of ozone profiles by the Umkehr measurements taken at Belsk (52°N, 21°E) with the Aura Microwave Limb Sounder overpasses: 2004–2006

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Overview of the EOS aura mission

Cited by 386 publications

References 21 publications

Observations of volcanic SO&lt;sub&gt;2&lt;/sub&gt; from MLS on Aura

Observations of volcanic SO&lt;sub&gt;2&lt;/sub&gt; from MLS on Aura

Ground‐level nitrogen dioxide concentrations inferred from the satellite‐borne Ozone Monitoring Instrument

Comparison of ozone profiles by the Umkehr measurements taken at Belsk (52°N, 21°E) with the Aura Microwave Limb Sounder overpasses: 2004–2006

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Observations of volcanic SO<sub>2</sub> from MLS on Aura

Observations of volcanic SO<sub>2</sub> from MLS on Aura