A new method for global retrievals of HCHO total columns from the Suomi National Polar‐orbiting Partnership Ozone Mapping and Profiler Suite

Li, Can; Joiner, Joanna; Krotkov, Nickolay A.; Dunlap, Laura

doi:10.1002/2015gl063204

Cited by 42 publications

(55 citation statements)

References 31 publications

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“…The characteristics of the spectral fitting are summarized in Table 1. To retrieve the SCDs we use a nonlinear least-squares inversion method implemented in the ELSUNC software (Lindström and Wedin, 1988) to minimize the cost function χ 2 defined as the weighted square difference between the measured and modeled radiance. Figure 2 shows the result of the fitting for three pixels in orbit 3538 over the Americas.…”

Section: Spectral Fittingmentioning

confidence: 99%

“…The first global H 2 CO measurements using UV radiation were reported by Chance et al (2000), using Global Ozone Monitoring Experiment (GOME) spectra. Since this seminal work, measurements of tropospheric H 2 CO have been obtained using data recorded by the SCanning Imaging Absorption spectrometer for Atmospheric CHartography (SCIAMACHY), GOME-2 instruments and Ozone Monitoring Instrument (OMI) (De Smedt et al, 2008González Abad et al, 2015;Hewson et al, 2015;Kurosu et al, 2004;Palmer et al, 2001;Vrekoussis et al, 2010;Wittrock et al, 2006), and now Smithsonian Astrophysical Observatory Ozone Mapping and Profiler Suite (SAO OMPS; this work and Li et al, 2015). Having overlapping retrievals from OMI and OMPS opens the possibility of building a long-term data set of H 2 CO using similar retrieval algorithms and having a period of cross-calibration to allow us to extract valuable conclusions about the performance of both instruments that will be of great value for future low-Earth orbit (LEO) and geostationary missions such as the Tropospheric Emissions: Monitoring of Pollution (TEMPO; Chance et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Smithsonian Astrophysical Observatory Ozone Mapping and Profiler Suite (SAO OMPS) formaldehyde retrieval

et al. 2016

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Abstract. This paper presents our new formaldehyde (H 2 CO) retrievals, obtained from spectra recorded by the nadir instrument of the Ozone Mapping and Profiler Suite (OMPS) flown on board NASA's Suomi National Polarorbiting Partnership (SUOMI-NPP) satellite. Our algorithm is similar to the one currently in place for the production of NASA's Ozone Monitoring Instrument (OMI) operational H 2 CO product. We are now able to produce a set of longterm data from two different instruments that share a similar concept and a similar retrieval approach. The ongoing overlap period between OMI and OMPS offers a perfect opportunity to study the consistency between both data sets. The different spatial and spectral resolution of the instruments is a source of discrepancy in the retrievals despite the similarity of the physic assumptions of the algorithm. We have concluded that the reduced spectral resolution of OMPS in comparison with OMI is not a significant obstacle in obtaining good-quality retrievals. Indeed, the improved signal-to-noise ratio of OMPS with respect to OMI helps to reduce the noise of the retrievals performed using OMPS spectra. However, the size of OMPS spatial pixels imposes a limitation in the capability to distinguish particular features of H 2 CO that are discernible with OMI. With root mean square (RMS) residuals ∼ 5×10−4 for individual pixels we estimate the detection limit to be about 7.5 × 10 15 molecules cm −2 . Total vertical column density (VCD) errors for individual pixels range between 40 % for pixels with high concentrations to 100 % or more for pixels with concentrations at or below the detection limit. We compare different OMI products (SAO OMI v3.0.2 and BIRA OMI v14) with our OMPS product using 1 year of data, between September 2012 and September 2013. The seasonality of the retrieved slant columns is captured similarly by all products but there are discrepancies in the values of the VCDs. The mean biases among the two OMI products and our OMPS product are 23 % between OMI SAO and OMPS SAO and 28 % between OMI BIRA and OMPS SAO for eight selected regions.

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Section: Spectral Fittingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Smithsonian Astrophysical Observatory Ozone Mapping and Profiler Suite (SAO OMPS) formaldehyde retrieval

et al. 2016

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“…As for the previous algorithm versions, level-2 and level-3 data products of version 14 are openly available on TEMIS (http://h2co.aeronomie.be). Comparisons between the BIRA-IASB OMI H 2 CO product and the OMI operational product from SAO can be found in González Abad et al (2015b), while comparisons with the NASA OMPS PCA product can be found in Li et al (2015).…”

Section: Formaldehyde Retrievalsmentioning

confidence: 99%

Diurnal, seasonal and long-term variations of global formaldehyde columns inferred from combined OMI and GOME-2 observations

et al. 2015

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Abstract. We present the new version (v14) of the BIRA-IASB algorithm for the retrieval of formaldehyde (H 2 CO) columns from spaceborne UV-visible sensors. Applied to OMI measurements from Aura and to GOME-2 measurements from MetOp-A and MetOp-B, this algorithm is used to produce global distributions of H 2 CO representative of midmorning and early afternoon conditions. Its main features include (1) a new iterative DOAS scheme involving three fitting intervals to better account for the O 2 -O 2 absorption, (2) the use of earthshine radiances averaged in the equatorial Pacific as reference spectra, and (3) a destriping correction and background normalisation resolved in the across-swath position. For the air mass factor calculation, a priori vertical profiles calculated by the IMAGES chemistry transport model at 09:30 and 13:30 LT are used. Although the resulting GOME-2 and OMI H 2 CO vertical columns are found to be highly correlated, some systematic differences are observed. Afternoon columns are generally larger than morning ones, especially in mid-latitude regions. In contrast, over tropical rainforests, morning H 2 CO columns significantly exceed those observed in the afternoon. These differences are discussed in terms of the H 2 CO column variation between mid-morning and early afternoon, using ground-based MAX-DOAS measurements available from seven stations in Europe, China and Africa. Validation results confirm the capacity of the combined satellite measurements to resolve diurnal variations in H 2 CO columns. Furthermore, vertical profiles derived from MAX-DOAS measurements in the Beijing area and in Bujumbura are used for a more detailed validation exercise. In both regions, we find an agreement better than 15 % when MAX-DOAS profiles are used as a priori for the satellite retrievals. Finally, regional trends in H 2 CO columns are estimated for the 2004-2014 period using SCIAMACHY and GOME-2 data for morning conditions, and OMI for early afternoon conditions. Consistent features are observed, such as an increase of the columns in India and central-eastern China, and a decrease in the eastern US and Europe. We find that the higher horizontal resolution of OMI combined with a better sampling and a more favourable illumination at midday allow for more significant trend estimates, especially over Europe and North America. Importantly, in some parts of the Amazonian forest, we observe with both time series a significant downward trend in H 2 CO columns, spatially correlated with areas affected by deforestation.

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“…Since isoprene can also be a precursor of HCHO , future work should investigate the relationship of HCHO to isoprene in the whole Southern Hemisphere, although such an investigation cannot feasibly be easily performed at present using satellite measurements alone. All the above interpretations need to be carefully considered because of the uncertainty of HCHO retrieval attributed to relatively weak signals and a strong interference (Li et al 2015). Thus, the improvement of the HCHO retrieval algorithm is another future undertaking required for a better understanding of climatological HCHO patterns.…”

Section: Formaldehydementioning

confidence: 99%

Southern Hemisphere mid- and high-latitudinal AOD, CO, NO2, and HCHO: spatiotemporal patterns revealed by satellite observations

Ahn

Choi

Kim

et al. 2019

Prog Earth Planet Sci

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To assess air pollution emitted in Southern Hemisphere mid-latitudes and transported to Antarctica, we investigate the climatological mean and temporal trends in aerosol optical depth (AOD), carbon monoxide (CO), nitrogen dioxide (NO 2 ), and formaldehyde (HCHO) columns using satellite observations. Generally, all these measurements exhibit sharp peaks over and near the three nearby inhabited continents: South America, Africa, and Australia. This pattern indicates the large emission effect of anthropogenic activities and biomass burning processes. High AOD is also found over the Southern Atlantic Ocean, probably because of the sea salt production driven by strong winds. Since the pristine Antarctic atmosphere can be polluted by transport of air pollutants from the mid-latitudes, we analyze the 10-day back trajectories that arrive at Antarctic ground stations in consideration of the spatial distribution of mid-latitudinal AOD, CO, NO 2 , and HCHO. We find that the influence of mid-latitudinal emission differs across Antarctic regions: western Antarctic regions show relatively more back trajectories from the mid-latitudes, while the eastern Antarctic regions do not show large intrusions of mid-latitudinal air masses. Finally, we estimate the long-term trends in AOD, CO, NO 2 , and HCHO during the past decade (2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015)(2016). While CO shows a significant negative trend, the others show overall positive trends. Seasonal and regional differences in trends are also discussed.

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A new method for global retrievals of HCHO total columns from the Suomi National Polar‐orbiting Partnership Ozone Mapping and Profiler Suite

Cited by 42 publications

References 31 publications

Smithsonian Astrophysical Observatory Ozone Mapping and Profiler Suite (SAO OMPS) formaldehyde retrieval

Smithsonian Astrophysical Observatory Ozone Mapping and Profiler Suite (SAO OMPS) formaldehyde retrieval

Diurnal, seasonal and long-term variations of global formaldehyde columns inferred from combined OMI and GOME-2 observations

Southern Hemisphere mid- and high-latitudinal AOD, CO, NO2, and HCHO: spatiotemporal patterns revealed by satellite observations

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