Tracking Daily Concentrations of PM_2.5 Chemical Composition in China since 2000

Environmental Science & Technology, Journal Year: 2022, Volume and Issue: 56(22), P. 16517 - 16527

Published: Nov. 1, 2022

PM2.5 chemical components play significant roles in the climate, air quality, and public health, vary due to their different physicochemical properties. Obtaining accurate timely updated information on China's composition is basis for research environmental management. Here, we developed a full-coverage near-real-time data set at 10 km spatial resolution since 2000, combining Weather Research Forecasting-Community Multiscale Air Quality modeling system, ground observations, machine learning algorithm, multisource-fusion data. our are good agreement with available observations (correlation coefficients range from 0.64 0.75 monthly scale 2000 2020 0.67 0.80 daily 2013 2020; most normalized mean biases within ±20%). Our reveals long-term trends China, especially rapid decreases after sulfate, nitrate, ammonium, organic matter, black carbon, rate of -9.0, -7.2, -8.1, -8.4, -9.2% per year, respectively. The day-to-day variability also well captured, including evolutions distribution shares components. As part Tracking Pollution China (http://tapdata.org.cn), this daily-updated provides large opportunities health climate as policy-making China.

Language: Английский

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Smoke-weather interaction affects extreme wildfires in diverse coastal regions

Science, Journal Year: 2023, Volume and Issue: 379(6631), P. 457 - 461

Published: Feb. 2, 2023

Extreme wildfires threaten human lives, air quality, and ecosystems. Meteorology plays a vital role in wildfire behaviors, the links between climate have been widely studied. However, it is not fully clear how fire-weather feedback affects short-term variability, which undermines our ability to mitigate fire disasters. Here, we show primacy of synoptic-scale driving extreme fires Mediterranean monsoon regimes West Coast United States Southeastern Asia. We found that radiative effects smoke aerosols can modify near-surface wind, dryness, rainfall thus worsen pollution by enhancing emissions weakening dispersion. The intricate interactions among wildfires, smoke, weather form positive loop substantially increases exposure.

Language: Английский

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Role of atmospheric boundary layer dynamics in driving surface black carbon concentrations over a high-altitude station in North-east India

Atmospheric Pollution Research, Journal Year: 2025, Volume and Issue: unknown, P. 102420 - 102420

Published: Jan. 1, 2025

Language: Английский

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Char dominates black carbon aerosol emission and its historic reduction in China

Nature Communications, Journal Year: 2023, Volume and Issue: 14(1)

Published: Oct. 13, 2023

Emission factors and inventories of black carbon (BC) aerosols are crucial for estimating their adverse atmospheric effect. However, it is imperative to separate BC emissions into char soot subgroups due significantly different physicochemical properties potential effects. Here, we present a substantial dataset emission derived from field laboratory measurements. Based on the latest results char-to-soot ratio, further reconstructed years 1960-2017 in China. Our findings indicate that dominates annual its huge historical reduction, which can be attributable rapid changes energy structure, combustion technology standards recent decades. suggest reductions both China world should focus char, mainly derives lower-temperature easier decrease compared soot.

Language: Английский

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Identifying missing sources and reducing NO_x emissions uncertainty over China using daily satellite data and a mass-conserving method

Atmospheric chemistry and physics, Journal Year: 2025, Volume and Issue: 25(4), P. 2291 - 2309

Published: Feb. 21, 2025

Abstract. This study applies a mass-conserving model-free analytical approach to daily observations on grid-by-grid basis of NO2 from the Tropospheric Monitoring Instrument (TROPOMI) rapidly and flexibly quantify changing emerging sources NOx emissions at high spatial temporal resolution. The inverted optimized underlying ranges include quantification atmospheric in situ processing, transport, physics. results are presented over three regions China, including Shandong Hubei, which urbanizing not frequently addressed global literature. day-to-day found be 1.96 ± 0.27 µg m−2 s−1 pixels with available priori values (1.94 s−1), while 1.22 0.63 extra inventory is lower than 0.3 s−1. Source attribution based thermodynamics combustion temperature, processing successfully identifies five different industrial source types. Emissions these sites adjacent Yangtze River 161. 68.9 Kt yr−1 (163 % higher priori), consistent missing light medium industries located along river, contradicting previous studies attributing water as emissions. Finally, reveal an uncertainty larger variability, providing quantitative information for placement future monitoring stations. It hoped that findings will drive new top-down estimates, quantified updated continuously consistently remotely sensed measurements associated uncertainties actively reflect land-use changes misidentified emissions, quantifying datasets inform bottom-up community.

Language: Английский

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A comprehensive reappraisal of long-term aerosol characteristics, trends, and variability in Asia

Atmospheric chemistry and physics, Journal Year: 2023, Volume and Issue: 23(14), P. 8187 - 8210

Published: July 24, 2023

Abstract. Changes in aerosol loadings and properties are important for the understanding of atmospheric environment climate change. This study investigates characteristics long-term trends aerosols different sizes types Asia from 2000 to 2020 by considering multi-source data novel analysis methods perspectives, all which provides groundwork promoting acquisition new discoveries that past. The geometric mean aggregation method is applied, serial autocorrelation considered avoid overestimation trend significance. Among regions Asia, high values optical depth (AOD) mainly concentrated East (EA) South (SA) closely related population density. AOD EA showed most significant negative trend, with a value -5.28×10-4 per year, owing decreases organic carbon (OC), black (BC), dust aerosols. It also worth noting this observed large-scale decrease OC BC unique phenomenon region around China. In contrast, concentrations SA generally show positive an increased 1.25 × 10−3 year. increase due large emissions fine-mode aerosols, such as sulfate aerosol. Additionally, loading northern has lower variability when compared China Plain, revealing relatively more persistent air pollution situation. Over whole percentage changes seen increases (6.23 %) (17.09 AOD, together (−5.51 %), (−3.07 sea salt (−9.80 AOD. Except anthropogenic emissions, wildfires found summer, whereas differently sized only shows slight small-sized (−3.34 total did not suggests that, perspective, recent years have mostly been offsetting earlier over Asia. To summarize, above findings analyse comprehensive distributions reappraise parameters, will greatly enhance regional global climatology, addition filling gaps breaking through limitations past knowledge.

Language: Английский

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Spatiotemporal variation characteristics of global fires and their emissions

Atmospheric chemistry and physics, Journal Year: 2023, Volume and Issue: 23(13), P. 7781 - 7798

Published: July 14, 2023

Abstract. Intense regional fires are a common occurrence in the context of climate warming and have progressively evolved into one major natural disasters terrestrial ecosystems, posing serious hazard to atmosphere change. We investigated spatial distribution, intensity, emission changes, meteorological differences between different fire-active fire-prone regions globally based on multi-source satellite remote sensing fire data, data order better understand change trend activity at multiple temporal scales. The findings demonstrate that while burned area (BA) has decreased slowly over last 20 years, fraction (BF), count (FC), radiative power (FRP) all exhibit pronounced seasonal variations. physical characteristics fires, including BF, FC, FRP, experience greater variation as latitude increases, with summer autumn being seasons most frequent worldwide. This study also shows emissions declined substantially 2012 2020 northern Canada, Alaska, northeastern China, whereas it notably increased Siberia region during same period, primarily due rise emissions. results classification show difference CO2 produced by among is relatively small. Excluding CO2, aerosol (the total organic carbon (OC), (TC), black (BC)) ranged from 78.6 % 84.2 %, least significant air pollutants PM2.5, SO2, NOx) 5.8 11.7 %. abundance vegetation predominately affects intensity development, weather conditions can indirectly influence incidence altering growth condition vegetation. Correspondingly, increase temperature Northern Hemisphere's middle- high-latitude forest likely cause for emissions, tropical was largely influenced decrease precipitation relative humidity. contributes understanding variations variability provides support control across seasons.

Language: Английский

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Divergent Impacts of Biomass Burning and Fossil Fuel Combustion Aerosols on Fog‐Cloud Microphysics and Chemistry: Novel Insights From Advanced Aerosol‐Fog Sampling

Geophysical Research Letters, Journal Year: 2024, Volume and Issue: 51(4)

Published: Feb. 20, 2024

Abstract Activation of biomass burning aerosols (BBA) and fossil fuel combustion (FFA) in fogs clouds significantly impact regional air quality through aqueous chemistry climate by affecting cloud microphysics. However, we lack direct observations how these behave clouds. Using a newly developed aerosol‐cloud sampling system, conducted during fog events found that BBA, despite their high organic content, effectively contributed to super‐micron interstitial droplets low supersaturation fogs. In contrast, FFA, predominantly externally mixed organic, did not grow beyond the size due near‐hydrophobic nature. Measurements under supersaturations relevant for formation revealed portions FFA could serve as condensation nuclei, but only when exceeded ∼0.14%. These findings have broad implications future investigations into influence BBA on interactions with

Language: Английский

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Roles of Atmospheric Aerosols in Extreme Meteorological Events: a Systematic Review

Current Pollution Reports, Journal Year: 2022, Volume and Issue: 8(2), P. 177 - 188

Published: March 11, 2022

Language: Английский

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Direct and indirect effects and feedbacks of biomass burning aerosols over Mainland Southeast Asia and South China in springtime

The Science of The Total Environment, Journal Year: 2022, Volume and Issue: 842, P. 156949 - 156949

Published: June 23, 2022

Language: Английский

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