Dataset Information

Fire air pollution reduces global terrestrial productivity.

ABSTRACT: Fire emissions generate air pollutants ozone (O3) and aerosols that influence the land carbon cycle. Surface O3 damages vegetation photosynthesis through stomatal uptake, while aerosols influence photosynthesis by increasing diffuse radiation. Here we combine several state-of-the-art models and multiple measurement datasets to assess the net impacts of fire-induced O3 damage and the aerosol diffuse fertilization effect on gross primary productivity (GPP) for the 2002-2011 period. With all emissions except fires, O3 decreases global GPP by 4.0?±?1.9 Pg C yr-1 while aerosols increase GPP by 1.0?±?0.2 Pg C yr-1 with contrasting spatial impacts. Inclusion of fire pollution causes a further GPP reduction of 0.86?±?0.74 Pg C yr-1 during 2002-2011, resulting from a reduction of 0.91?±?0.44 Pg C yr-1 by O3 and an increase of 0.05?±?0.30 Pg C yr-1 by aerosols. The net negative impact of fire pollution poses an increasing threat to ecosystem productivity in a warming future world.

SUBMITTER: Yue X

PROVIDER: S-EPMC6303378 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature

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Fire air pollution reduces global terrestrial productivity.

Yue Xu X Unger Nadine N

Nature communications 20181221 1

Fire emissions generate air pollutants ozone (O3) and aerosols that influence the land carbon cycle. Surface O3 damages vegetation photosynthesis through stomatal uptake, while aerosols influence photosynthesis by increasing diffuse radiation. Here we combine several state-of-the-art models and multiple measurement datasets to assess the net impacts of fire-induced O3 damage and the aerosol diffuse fertilization effect on gross primary productivity (GPP) for the ...[more]

PMID: 30575760

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Project description:BackgroundUnderstanding how environmental factors affect SARS-CoV-2 transmission could inform global containment efforts. Despite high scientific and public interest and multiple research reports, there is currently no consensus on the association of environmental factors and SARS-CoV-2 transmission. To address this research gap, we aimed to assess the relative risk of transmission associated with weather conditions and ambient air pollution.MethodsIn this global analysis, we adjusted for the delay between infection and detection, estimated the daily reproduction number at 3739 global locations during the COVID-19 pandemic up until late April, 2020, and investigated its associations with daily local weather conditions (ie, temperature, humidity, precipitation, snowfall, moon illumination, sunlight hours, ultraviolet index, cloud cover, wind speed and direction, and pressure data) and ambient air pollution (ie, PM2·5, nitrogen dioxide, ozone, and sulphur dioxide). To account for other confounding factors, we included both location-specific fixed effects and trends, controlling for between-location differences and heterogeneities in locations' responses over time. We built confidence in our estimations through synthetic data, robustness, and sensitivity analyses, and provided year-round global projections for weather-related risk of global SARS-CoV-2 transmission.FindingsOur dataset included data collected between Dec 12, 2019, and April 22, 2020. Several weather variables and ambient air pollution were associated with the spread of SARS-CoV-2 across 3739 global locations. We found a moderate, negative relationship between the estimated reproduction number and temperatures warmer than 25°C (a decrease of 3·7% [95% CI 1·9-5·4] per additional degree), a U-shaped relationship with outdoor ultraviolet exposure, and weaker positive associations with air pressure, wind speed, precipitation, diurnal temperature, sulphur dioxide, and ozone. Results were robust to multiple assumptions. Independent research building on our estimates provides strong support for the resulting projections across nations.InterpretationWarmer temperature and moderate outdoor ultraviolet exposure result in a slight reduction in the transmission of SARS-CoV-2; however, changes in weather or air pollution alone are not enough to contain the spread of SARS-CoV-2 with other factors having greater effects.FundingNone.

Dataset Information

Fire air pollution reduces global terrestrial productivity.

Publications

Fire air pollution reduces global terrestrial productivity.

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