The ozone monitoring instrument

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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“…The OMI instrument is described by Levelt et al (2006). OMI is a nadir UV/visible imaging spectrometer.…”

Section: Comparison With Omimentioning

confidence: 99%

Observations of volcanic SO2 from MLS on Aura

et al. 2015

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“…OMI is an imaging spectrometer measuring atmospheric trace gases such as NO 2 and O 3 (Levelt et al, 2006). It is on board the Earth Observing System's (EOS) Aura satellite which was launched on 15 July 2004 and is collecting data since 9 August 2004, providing more than 6 yr of daily global NO 2 maps (Boersma et al, 2007).…”

Section: The Ozone Monitoring Instrumentmentioning

confidence: 99%

“…The change in ground pixel size, and hence spatial resolution, must be taken into account when analyzing and interpreting OMI data. A more detailed description of the OMI instrument can be found in Levelt et al (2006).…”

Section: The Ozone Monitoring Instrumentmentioning

confidence: 99%

NO2 measurements in Hong Kong using LED based long path differential optical absorption spectroscopy

et al. 2012

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Abstract. In this study we present the first long term measurements of atmospheric nitrogen dioxide (NO 2 ) using a LED based Long Path Differential Optical Absorption Spectroscopy (LP-DOAS) instrument. This instrument is measuring continuously in Hong Kong since December 2009, first in a setup with a 550 m absorption path and then with a 3820 m path at about 30 m to 50 m above street level. The instrument is using a high power blue light LED with peak intensity at 450 nm coupled into the telescope using a Y-fibre bundle. The LP-DOAS instrument measures NO 2 levels in the Kowloon Tong and Mongkok district of Hong Kong and we compare the measurement results to mixing ratios reported by monitoring stations operated by the Hong Kong Environmental Protection Department in that area. Hourly averages of coinciding measurements are in reasonable agreement (R = 0.74). Furthermore, we used the long-term data set to validate the Ozone Monitoring Instrument (OMI) NO 2 data product. Monthly averaged LP-DOAS and OMI measurements correlate well (R = 0.84) when comparing the data for the OMI overpass time. We analyzed weekly patterns in both data sets and found that the LP-DOAS detects a clear weekly cycle with a reduction on weekends during rush hour peaks, whereas OMI is not able to observe this weekly cycle due to its fix overpass time (13:30-14:30 LT -local time).

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“…Measurements of ultraviolet-visible (UV-VIS) radiation needed to perform atmospheric chemistry retrievals of ozone (O 3 ) and its precursors have been made from platforms in LEO for the past 22 years beginning with the launch of the Global Ozone Monitoring Experiment (GOME) in 1996 , and continuing with the launch of the Ozone Monitoring Instrument (OMI) in 2004 (Levelt et al, 2006), SCanning Imaging Absorption SpectroMeter for Atmospheric CHartographY (SCIAMACHY) in 2002 (Bovensmann et al, 1999), GOME-2 in 2006 and 2013 (Callies et al, 2000), the Ozone Mapping and Profiler Suite Nadir Mapper (OMPS NM) in 2011 and 2017 (Flynn et al, 2004;Yang et al, 2014), and the TROPOspheric Monitoring Instrument (TROPOMI) in 2017. These data have been useful for understanding global (e.g., Martin et al, 2003;Jaegl et al, 2005), regional (e.g., Duncan et al, 2016;Travis et al, 2016) and local air quality (e.g., Zhu et al, 2017) over daily (e.g., Valin et al, 2014;de Foy et al, 2016), seasonal (e.g., Russell et al, 2010), interannual, and decadal time periods (van der et al, 2008;De Smedt et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

The Dawn of Geostationary Air Quality Monitoring: Case Studies From Seoul and Los Angeles

Judd

Al-Saadi

Valin

et al. 2018

Front. Environ. Sci.

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With the near-future launch of geostationary Earth orbit (GEO) pollution monitoring satellite instruments over North America, East Asia, and Europe, the air quality community is preparing for an integrated global atmospheric composition observing system at unprecedented spatial and temporal resolutions. One of the ways that NASA has supported this community preparation is through demonstration of future space-borne capabilities using the Geostationary Trace gas and Aerosol Sensor Optimization (GeoTASO) airborne instrument. This paper integrates repeated high-resolution NO 2 maps from GeoTASO, ground-based Pandora spectrometers data, and low Earth orbit (LEO) measurements from the Ozone Mapping and Profiler Suite, for case studies over two regions: the Seoul Metropolitan Area, South Korea on June 9th, 2016 and Los Angeles Basin, California on June 27th, 2017. This dataset provides a unique opportunity to illustrate how GEO air quality monitoring platforms and ground-based remote sensing networks will close the current spatiotemporal observation gap. In both areas, the earliest morning maps exhibit spatial patterns similar to emission source areas (e.g., urbanized valleys, roadways, major airports) and change later in the day due to boundary layer dynamics, transport, and/or chemistry. On June 9th, 2016, GeoTASO observes NO 2 accumulating within the Seoul Metropolitan Area, while NO 2 peaks in the morning and decreases throughout the afternoon in the Los Angeles Basin on June 27th, 2017. The nominal resolution of GeoTASO is finer than will be obtained from GEO platforms, but when NO 2 data over Los Angeles are up-scaled to the expected resolution of TEMPO, spatial features discussed are preserved. Pandora instruments installed in both metropolitan areas capture the diurnal patterns observed by GeoTASO, continuously and over longer time periods and will play a critical role in validation of the next generation of satellite measurements. These case studies demonstrate the diversity of diurnal patterns in two urbanized regions and associates them with meteorology Judd et al.Dawn of Geostationary Air Quality Monitoring or anthropogenic patterns, hinting at the spatial and temporal richness of the upcoming GEO observations. LEO measurements, despite their inability to capture the diurnal patterns at fine spatial resolution, will be essential for intercalibrating the GEO radiances and cross-validating the GEO retrievals in an integrated global observing system.

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The ozone monitoring instrument

Cited by 1,847 publications

References 14 publications

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

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

NO<sub>2</sub> measurements in Hong Kong using LED based long path differential optical absorption spectroscopy

The Dawn of Geostationary Air Quality Monitoring: Case Studies From Seoul and Los Angeles

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The ozone monitoring instrument

Cited by 1,847 publications

References 14 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

NO&lt;sub&gt;2&lt;/sub&gt; measurements in Hong Kong using LED based long path differential optical absorption spectroscopy

The Dawn of Geostationary Air Quality Monitoring: Case Studies From Seoul and Los Angeles

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Product

Resources

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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

NO<sub>2</sub> measurements in Hong Kong using LED based long path differential optical absorption spectroscopy