Stratospheric Injection of Massive Smoke Plume From Canadian Boreal Fires in 2017 as Seen by DSCOVR‐EPIC, CALIOP, and OMPS‐LP Observations

Torres, Omar; Bhartia, P. K.; Taha, Ghassan; Jethva, Hiren; Das, Sampa; Colarco, Peter R.; Krotkov, Nickolay A.; Omar, Ali; Ahn, C.

doi:10.1029/2020jd032579

Cited by 75 publications

(102 citation statements)

References 92 publications

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“…Unlike during the 2017 British Columbia fire episodes, when a large fraction of the pyroCb generated aerosol plume remained initially in the troposphere and some of it ascended diabatically to the stratosphere on the next few days (Torres et al, 2020), during the Australian 2020 pyro-convective fires most of the produced carbonaceous aerosols appear to have gone directly into the stratosphere. Figure 7 shows TROPOMI retrieved UVAI and AOD fields on January 2, 2020.…”

Section: Australia 2019-2020 Firesmentioning

confidence: 92%

“…The SAM calculation procedure involves the separation of the stratospheric AOD component from the total AOD column measurement, and the use of an extinction-to-mass-conversion approximation. This approach was previously applied to EPIC (Earth Panchromatic Imaging Camera) near UV AOD retrievals to calculate the SAM associated with the 2017 British Columbia pyroCb's events (Torres et al, 2020).…”

Section: Australia 2019-2020 Firesmentioning

confidence: 99%

“…AOD retrievals associated with UVAI values larger than those indicated by the AOD-UVAI relationship are assumed to correspond to stratospheric aerosols. Figure 6 illustrates the stratospheric aerosol identification method applied to the carbonaceous aerosol layers resulting from the 2017 British Columbia Fires (Torres et al, 2020) on the left and, on the right, from the 2020 Australia fires. The solid line illustrates the reference AOD-UVAI relationship.…”

Section: Australia 2019-2020 Firesmentioning

confidence: 99%

“…Stratospheric AOD values were converted to mass estimates using the procedure described in Torres et al (2020) and included Appendix 1 for completeness. Figure 8 shows calculated daily values of aerosol mass (in kilotons) from December 31, 2019 thru January 7, 2020, resulting from aerosols above 12 km, altitude used as a proxy of the tropopause height.…”

Section: Australia 2019-2020 Firesmentioning

confidence: 99%

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TROPOMI Aerosol Products: Evaluation and Observations of Synoptic Scale Carbonaceous Aerosol Plumes during 2018–2020

Torres¹,

Jethva²,

Ahn³

et al. 2020

Preprint

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Abstract. TROPOMI near UV radiances are used as input to an inversion algorithm that simultaneously retrieves aerosol optical depth (AOD) and single scattering albedo (SSA) as well as the improved qualitative UV Aerosol Index (UVAI) that accurately accounts for the scattering effects of water clouds. We first present the TROPOMI aerosol algorithm (TropOMAER), an adaptation of the currently operational OMI near UV (OMAERUV & OMACA) inversion schemes, that take advantage of TROPOMI’s unprecedented fine near UV spatial resolution and the availability of ancillary aerosol-related information to derive aerosol loading in cloud-free and above-cloud aerosols scenes. An evaluation analysis of TROPOMI retrieved AOD/SSA products using sun-photometer observations shows improved levels of agreement with respect to those obtained with the heritage coarser resolution sensor. We then use TropOMAER aerosol retrieval results to discuss the the US Northwest and British Columbia 2018 wildfire season, the 2019 biomass burning season in the Amazon Basin, and the unprecedented January 2020 fire season in Australia that injected huge amounts of carbonaceous aerosols in the stratosphere.

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Section: Australia 2019-2020 Firesmentioning

confidence: 92%

Section: Australia 2019-2020 Firesmentioning

confidence: 99%

Section: Australia 2019-2020 Firesmentioning

confidence: 99%

Section: Australia 2019-2020 Firesmentioning

confidence: 99%

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TROPOMI Aerosol Products: Evaluation and Observations of Synoptic Scale Carbonaceous Aerosol Plumes during 2018–2020

Torres¹,

Jethva²,

Ahn³

et al. 2020

Preprint

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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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Brown Carbon Fuel and Emission Source Attributions to Global Snow Darkening Effect

Brown¹,

Wang²,

Flanner³

et al. 2021

Preprint

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 Brown carbon forcing on snow is larger than in previous modeling studies and is comparable to the snow darkening effect of black carbon. Northern Asia, Southeast Asia, and Southern Africa are the largest source contributors to global brown carbon snow darkening effect. Seasonal brown carbon is closely correlated with snow processes in the model, indicating the importance of aerosol-snow feedbacks.

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Stratospheric Injection of Massive Smoke Plume From Canadian Boreal Fires in 2017 as Seen by DSCOVR‐EPIC, CALIOP, and OMPS‐LP Observations

Abstract: A carbonaceous aerosol plume associated with wildfires in British

Cited by 75 publications

References 92 publications

TROPOMI Aerosol Products: Evaluation and Observations of Synoptic Scale Carbonaceous Aerosol Plumes during 2018–2020

TROPOMI Aerosol Products: Evaluation and Observations of Synoptic Scale Carbonaceous Aerosol Plumes during 2018–2020

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

Brown Carbon Fuel and Emission Source Attributions to Global Snow Darkening Effect

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