Reductions in California's urban fossil fuel CO2 emissions during the COVID-19 pandemic

Hopkins, F. M.; Xu, Xiaomei; Tavares-Reager, Joana; Welch, Allison; Czimczik, C. I.

doi:10.1002/essoar.10511271.1

Cited by 2 publications

(2 citation statements)

References 56 publications

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“…Annual plants were sampled and analysed for radiocarbon as a time-integrated snapshot of the changing atmospheric radiocarbon ratio [54][55][56][57]. Away from urban areas, the background level of atmospheric radiocarbon was above pre-industrial levels for our study period due to the production of radiocarbon in the atmosphere from past nuclear weapons testing.…”

Section: (C) Annual Plants and Soil Organic Mattermentioning

confidence: 99%

Ecosystem and soil respiration radiocarbon detects old carbon release as a fingerprint of warming and permafrost destabilization with climate change

Schuur,

Hicks Pries,

Mauritz

et al. 2023

Phil. Trans. R. Soc. A.

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The permafrost region has accumulated organic carbon in cold and waterlogged soils over thousands of years and now contains three times as much carbon as the atmosphere. Global warming is degrading permafrost with the potential to accelerate climate change as increased microbial decomposition releases soil carbon as greenhouse gases. A 19-year time series of soil and ecosystem respiration radiocarbon from Alaska provides long-term insight into changing permafrost soil carbon dynamics in a warmer world. Nine per cent of ecosystem respiration and 23% of soil respiration observations had radiocarbon values more than 50‰ lower than the atmospheric value. Furthermore, the overall trend of ecosystem and soil respiration radiocarbon values through time decreased more than atmospheric radiocarbon values did, indicating that old carbon degradation was enhanced. Boosted regression tree analyses showed that temperature and moisture environmental variables had the largest relative influence on lower radiocarbon values. This suggested that old carbon degradation was controlled by warming/permafrost thaw and soil drying together, as waterlogged soil conditions could protect soil carbon from microbial decomposition even when thawed. Overall, changing conditions increasingly favoured the release of old carbon, which is a definitive fingerprint of an accelerating feedback to climate change as a consequence of warming and permafrost destabilization. This article is part of the Theo Murphy meeting issue ‘Radiocarbon in the Anthropocene’.

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Section: (C) Annual Plants and Soil Organic Mattermentioning

confidence: 99%

Ecosystem and soil respiration radiocarbon detects old carbon release as a fingerprint of warming and permafrost destabilization with climate change

Schuur,

Hicks Pries,

Mauritz

et al. 2023

Phil. Trans. R. Soc. A.

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“…The datasets of on-road CO 2 and plant radiocarbon are available in the Dryad public data repository and can be accessed via https://doi.org/10.7280/D1F98G (Yañez et al, 2022). The city land use datasets are administered by the Association of Bay Area Governments, the Metropolitan Transportation Commission, and the Southern California Association of Governments.…”

Section: Conflict Of Interestmentioning

confidence: 99%

Reductions in California's Urban Fossil Fuel CO₂ Emissions During the COVID‐19 Pandemic

Hopkins

Tavares

et al. 2022

AGU Advances

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Carbon dioxide (CO 2 ) emissions associated with fossil fuel consumption (ffCO 2 ) are the dominant cause of climate change (IPCC, 2022). Hence, there is an urgent need to quantify ffCO 2 emissions to support the success of climate change mitigation efforts. Urban areas account for 30%-84% of global ffCO 2 emissions (Seto et al., 2014), despite encompassing less than 1% of the Earth's land area (Zhou et al., 2015). While being disproportional contributors to climate change, cities are also at the forefront of climate change mitigation actions (Rosenzweig et al., 2010), making them a top priority for quantifying and monitoring ffCO 2 emission reduction efforts.Satellite-borne instruments can detect CO 2 enhancements (i.e., 6 ppm above background) over large cities (Kiel et al., 2021;Schwandner et al., 2017), and urban tower networks continuously measure CO 2 levels in a small selection of cities in more economically developed countries. However, these atmospheric observation systems

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Reductions in California's urban fossil fuel CO2 emissions during the COVID-19 pandemic

Cited by 2 publications

References 56 publications

Ecosystem and soil respiration radiocarbon detects old carbon release as a fingerprint of warming and permafrost destabilization with climate change

Ecosystem and soil respiration radiocarbon detects old carbon release as a fingerprint of warming and permafrost destabilization with climate change

Reductions in California's Urban Fossil Fuel CO₂ Emissions During the COVID‐19 Pandemic

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Reductions in California's urban fossil fuel CO2 emissions during the COVID-19 pandemic

Cited by 2 publications

References 56 publications

Ecosystem and soil respiration radiocarbon detects old carbon release as a fingerprint of warming and permafrost destabilization with climate change

Ecosystem and soil respiration radiocarbon detects old carbon release as a fingerprint of warming and permafrost destabilization with climate change