Validation of SAGE III/ISS Solar Occultation Ozone Products With Correlative Satellite and Ground‐Based Measurements

Wang, H. J. Ray; Damadeo, Robert; Flittner, D. E.; Kramarova, N. A.; Taha, Ghassan; Davis, Sean; Thompson, A. M.; Strahan, S. E.; Wang, Yuhang; Froidevaux, L.; Degenstein, D. A.; Bourassa, Adam; Steinbrecht, Wolfgang; Walker, Kaley A.; Querel, Richard; Leblanc, Thierry; Godin‐Beekmann, Sophie; Hurst, D. F.; Hall, E.

doi:10.1029/2020jd032430

Cited by 32 publications

(30 citation statements)

References 76 publications

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“…Here, we use criteria very similar to that used by Wang et al. (2020) to identify matched pairs of ozone profiles from SAGE III/ISS and correlative satellite data sets. For matching other data sets with SAGE III/ISS, we consider profiles to be matched with SAGE III/ISS if they fall within ±1 day, ±2° latitude, and ±1,113 km in longitude (i.e., equivalent to ±10° longitude at the equator).…”

Section: Correlative Data and Methodsmentioning

confidence: 99%

“…Contributions from Rayleigh/molecular scattering are removed first, but ozone is not simply cleared out as an interfering species despite having an arguably more robust solution (of ozone extinction) from another part of the SAGE III/ISS retrieval algorithm (e.g., see Wang et al., 2020 for a description of the SAGE III/ISS ozone product). This is because doing so would make the water vapor solution dependent upon the relative accuracy of the ozone cross‐section database used here (Bogumil et al., 2003) between the primary ozone solution spectral range (∼600 nm) and that used for water vapor (∼945 nm).…”

Section: Sage Iii/iss Solar Water Vapor Datamentioning

confidence: 99%

“…In June 2017, a new SAGE III instrument aboard the International Space Station (SAGE III/ISS) began regular operation and has been making ∼30 solar occultation measurements per day since that time. From these sunrise and sunset transmittance measurements, vertical profiles of ozone (Wang et al., 2020), nitrogen dioxide, water vapor, and aerosol extinction at multiple wavelengths are retrieved, and have been made publicly available as version 5.1.…”

Section: Introductionmentioning

confidence: 99%

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Validation of SAGE III/ISS Solar Water Vapor Data With Correlative Satellite and Balloon‐Borne Measurements

et al. 2021

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Water vapor plays an important role in determining the radiative balance of Earth's atmosphere, and variations in stratospheric water vapor (SWV) concentrations have been shown to affect radiative forcing (Forster & Shine, 1999; Solomon et al., 2010), ozone concentrations (Dvortsov & Solomon, 2001), and atmospheric circulation (Maycock et al., 2013). These variations in SWV can occur on subseasonal to decadal timescales, so accurate and continuous global measurements of SWV are essential in order to understand SWV variability over the range of relevant timescales. Although no formal satellite-based monitoring program exists for SWV, a number of temporally overlapping satellite instruments have been making measurements of SWV continuously since the launch of the Stratospheric Aerosol and Gas Experiment II (SAGE II) in

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Section: Correlative Data and Methodsmentioning

confidence: 99%

Section: Sage Iii/iss Solar Water Vapor Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Validation of SAGE III/ISS Solar Water Vapor Data With Correlative Satellite and Balloon‐Borne Measurements

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“…The first-guess aerosol extinction profile, x 0 , is defined based on a single SAGE climatological profile. Aerosols are assumed to consist of spherical liquid sulfate particles (75 % H 2 SO 4 ) with index of refraction m = 1.448 + 0i (Yue and Deepak, 1983;Wang et al, 1996). In the V1.0 algorithm, the aerosol size distribution (ASD) is assumed to be a bi-modal lognormal distribution (Loughman et al, 2018); this was updated to a gamma distribution in V1.5 (Chen et al, 2018).…”

Section: Review Of the V10 And V15 Omps Lp Algorithmsmentioning

confidence: 99%

OMPS LP Version 2.0 multi-wavelength aerosol extinction coefficient retrieval algorithm

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Abstract. The OMPS Limb Profiler (LP) instrument is designed to provide high-vertical-resolution ozone and aerosol profiles from measurements of the scattered solar radiation in the 290–1000 nm spectral range. It collected its first Earth limb measurement on 10 January 2012 and continues to provide daily global measurements of ozone and aerosol profiles from the cloud top up to 60 and 40 km, respectively. The relatively high vertical and spatial sampling allow detection and tracking of sporadic events when aerosol particles are injected into the stratosphere, such as volcanic eruptions or pyrocumulonimbus (PyroCb) events. In this paper we discuss the newly released Version 2.0 OMPS multi-wavelength aerosol extinction coefficient retrieval algorithm. The algorithm now produces aerosol extinction profiles at 510, 600, 674, 745, 869 and 997 nm wavelengths. The OMPS LP Version 2.0 data products are compared to the SAGE III/ISS, OSIRIS and CALIPSO missions and shown to be of good quality and suitable for scientific studies. The comparison shows significant improvements in the OMPS LP retrieval performance in the Southern Hemisphere (SH) and at lower altitudes. These improvements arise from use of the longer wavelengths, in contrast with the V1.0 and V1.5 OMPS aerosol retrieval algorithms, which used radiances only at 675 nm and therefore had limited sensitivity in those regions. In particular, the extinction coefficients at 745, 869 and 997 nm are shown to be the most accurate, with relative accuracies and precisions close to 10 % and 15 %, respectively, while the 675 nm relative accuracy and precision are on the order of 20 %. The 510 nm extinction coefficient is shown to have limited accuracy in the SH and is only recommended for use between 20–24 km and only in the Northern Hemisphere. The V2.0 retrieval algorithm has been applied to the complete set of OMPS LP measurements, and the new dataset is publicly available.

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“…The importance of possible changes in the background stratospheric aerosol layer led to the analysis of each volcanically quiescent period (Deshler et al, 2006). For the considered period from January 1979 through to the end of 2004, the variability of stratospheric aerosol layer is explored using measurements from space-based instruments such as SAGE II (Thomason et al, 2008), CALIPSO (Winker et al, 2010), GOMOS/Envisat (Vanhellemont et al, 2010), SCIA-MACHY (von Savigny et al, 2015), OSIRIS/Odin (Bourassa et al, 2007), SAGE III/ISS (Chu and Veiga, 1998), and OMPS/LP (Loughman et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the OMPS/LP stratospheric aerosol extinction product using SAGE III/ISS observations

et al. 2020

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Abstract. The Ozone Mapping and Profiler Suite Limb Profiler (OMPS/LP) has been taking limb-scattered measurements since April 2012. It is designed to produce ozone and aerosol vertical profiles at a 1.6 km vertical resolution over the entire sunlit globe. The Version 1.5 (V1.5) aerosol extinction retrieval algorithm provides aerosol extinction profiles using observed radiances at 675 nm. The algorithm assumes Mie theory and a gamma function aerosol size distribution for the stratospheric aerosol that is derived from results calculated by the Community Aerosol and Radiation Model for Atmospheres (CARMA). In this paper, we compare V1.5 LP aerosol profiles with SAGE III/ISS solar occultation observations for the period from June 2017 to May 2019, when both measurements were available to evaluate our ability to characterize background aerosol conditions. Overall, LP extinction profiles agree with SAGE III/ISS data to within ±25 % for altitudes between 19 and 27 km, even during periods perturbed by volcanic eruptions or intense forest fires. In this altitude range, the slope parameter of linear fitting of LP extinction values with respect to SAGE III/ISS measurements is close to 1.0, with Pearson correlation coefficients of r≥0.95, indicating that the LP aerosol data are reliable in that altitude range. Comparisons of extinction time series show that both instruments capture the variability of the stratospheric aerosol layer quite well, and the differences between the two instruments vary from 0 % to ±25 % depending on altitude, latitude, and time. In contrast, we find erroneous seasonal variations in the OMPS/LP Version 1.5 dataset, which usually exist below 20 km in the Southern Hemisphere due to the lack of sensitivity to particles when the scattering angle (SA) is greater than 145∘. We also find that LP-retrieved extinction is systematically higher than SAGE III/ISS observations at altitudes above 28 km and systematically lower below 19 km in the tropics with significant biases up to ±13 %. This is likely due in part to the fact that the actual aerosol size distribution is altitude dependent. There are also other reasons related to cloud contamination, wavelength limitations, aerosol loading, and the influence of the viewing configuration.

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Validation of SAGE III/ISS Solar Occultation Ozone Products With Correlative Satellite and Ground‐Based Measurements

Cited by 32 publications

References 76 publications

Validation of SAGE III/ISS Solar Water Vapor Data With Correlative Satellite and Balloon‐Borne Measurements

Validation of SAGE III/ISS Solar Water Vapor Data With Correlative Satellite and Balloon‐Borne Measurements

OMPS LP Version 2.0 multi-wavelength aerosol extinction coefficient retrieval algorithm

Evaluation of the OMPS/LP stratospheric aerosol extinction product using SAGE III/ISS observations

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