Dataset Information

High resolution mapping of nitrogen dioxide with TROPOMI: First results and validation over the Canadian oil sands.

ABSTRACT: TROPOMI, on-board the Sentinel-5 Precursor satellite is a nadir-viewing spectrometer measuring reflected sunlight in the ultraviolet, visible, near-infrared, and shortwave infrared spectral range. From these spectra several important air quality and climate-related atmospheric constituents are retrieved at an unprecedented high spatial resolution, including nitrogen dioxide (NO₂). We present the first retrievals of TROPOMI NO₂ over the Canadian Oil Sands, contrasting them with observations from the OMI satellite instrument, and demonstrate its ability to resolve individual plumes and highlight its potential for deriving emissions from individual mining facilities. Further, the first TROPOMI NO₂ validation is presented, consisting of aircraft and surface in-situ NO₂ observations, as well as ground-based remote-sensing measurements between March and May 2018. Our comparisons show that the TROPOMI NO₂ vertical column densities are highly correlated with the aircraft and surface in-situ NO₂ observations, and the ground-based remote-sensing measurements with a low bias (15-30 %) over the Canadian Oil Sands.

Plain language summary

Nitrogen dioxide (NO₂) is a pollutant that is linked to respiratory health issues and has negative environmental impacts such as soil and water acidification. Near the surface the most significant sources of NO₂ are fossil fuel combustion and biomass burning. With a recently launched satellite instrument (TROPOspheric Monitoring Instrument; TROPOMI) NO₂ can be measured with an unprecedented combination of accuracy, spatial coverage, and resolution. This work presents the first TROPOMI NO₂ measurements near the Canadian Oil Sands and shows that these measurements have an outstanding ability to detect NO₂ on a very high horizontal resolution that is unprecedented for satellite NO₂ observations. Further, these satellite measurements are in excellent agreement with aircraft and ground-based measurements.

SUBMITTER: Griffin D

PROVIDER: S-EPMC8051066 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:The subsurface microbiology of an Athabasca oil sands reservoir in western Canada containing severely biodegraded oil was investigated by combining 16S rRNA gene- and polar lipid-based analyses of reservoir formation water with geochemical analyses of the crude oil and formation water. Biomass was filtered from formation water, DNA was extracted using two different methods, and 16S rRNA gene fragments were amplified with several different primer pairs prior to cloning and sequencing or community fingerprinting by denaturing gradient gel electrophoresis (DGGE). Similar results were obtained irrespective of the DNA extraction method or primers used. Archaeal libraries were dominated by Methanomicrobiales (410 of 414 total sequences formed a dominant phylotype affiliated with a Methanoregula sp.), consistent with the proposed dominant role of CO(2) -reducing methanogens in crude oil biodegradation. In two bacterial 16S rRNA clone libraries generated with different primer pairs, > 99% and 100% of the sequences were affiliated with Epsilonproteobacteria (n = 382 and 72 total clones respectively). This massive dominance of Epsilonproteobacteria sequences was again obtained in a third library (99% of sequences; n = 96 clones) using a third universal bacterial primer pair (inosine-341f and 1492r). Sequencing of bands from DGGE profiles and intact polar lipid analyses were in accordance with the bacterial clone library results. Epsilonproteobacterial OTUs were affiliated with Sulfuricurvum, Arcobacter and Sulfurospirillum spp. detected in other oil field habitats. The dominant organism revealed by the bacterial libraries (87% of all sequences) is a close relative of Sulfuricurvum kujiense - an organism capable of oxidizing reduced sulfur compounds in crude oil. Geochemical analysis of organic extracts from bitumen at different reservoir depths down to the oil water transition zone of these oil sands indicated active biodegradation of dibenzothiophenes, and stable sulfur isotope ratios for elemental sulfur and sulfate in formation waters were indicative of anaerobic oxidation of sulfur compounds. Microbial desulfurization of crude oil may be an important metabolism for Epsilonproteobacteria indigenous to oil reservoirs with elevated sulfur content and may explain their prevalence in formation waters from highly biodegraded petroleum systems.

Project description:Historically, environmental research and monitoring in the Alberta oil sands region (OSR) located in northeastern Alberta, Canada, have largely neglected, meaningful Indigenous participation. Through years of experience on the land, Indigenous knowledge (IK) holders recognize change on the landscape, drawing on inextricable links between environmental health and practicing traditional rights. The cumulative impacts of crude oil production are of great concern to Indigenous communities, and monitoring initiatives in the OSR provide unique opportunities to develop Indigenous community-based monitoring (ICBM). A review of ICBM literature on the OSR from 2009 to 2020 was completed. Based on this review, we identify best practices in ICBM and propose governance structures and a framework to support meaningful integration of ICBM into regulatory environmental monitoring. Because it involves multimedia monitoring and produces data and insights that integrate many aspects of the environment, ICBM is important for natural science research. ICBM can enhance the relevance of environmental monitoring by examining relationships between physical and chemical stressors and culturally relevant indicators, so improving predictions of long-term changes in the environment. Unfortunately, many Indigenous communities distrust researchers owing to previous experiences of exploitive use of IK. In the present paper, we recommend important practices for the integration of IK into regional environmental monitoring programs. ICBM is important to communities because it includes conditions to which communities can exercise traditional rights, and highlight how industrial activities affect this ability. Equally important, ICBM can generate a resurgence of Indigenous languages and subsequently traditional practices; it can also revive the connection with traditional lands and improve food security. Integr Environ Assess Manag 2022;18:407-427. © 2021 The Authors. Integrated Environmental Assessment and Management published by Wiley Periodicals LLC on behalf of Society of Environmental Toxicology & Chemistry (SETAC).

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High resolution mapping of nitrogen dioxide with TROPOMI: First results and validation over the Canadian oil sands.

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