Worldwide validation of CAMS and MERRA-2 reanalysis aerosol optical depth products using 15 years of AERONET observations

Atmospheric Environment, Journal Year: 2019, Volume and Issue: 225, P. 117216 - 117216

Published: Dec. 16, 2019

Language: Английский

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PM2.5 and O3 pollution during 2015–2019 over 367 Chinese cities: Spatiotemporal variations, meteorological and topographical impacts

Environmental Pollution, Journal Year: 2020, Volume and Issue: 264, P. 114694 - 114694

Published: May 5, 2020

Language: Английский

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A review of coarse mineral dust in the Earth system

Aeolian Research, Journal Year: 2022, Volume and Issue: 60, P. 100849 - 100849

Published: Dec. 16, 2022

Mineral dust particles suspended in the atmosphere span more than three orders of magnitude diameter, from <0.1 µm to 100 µm. This wide size range makes a unique aerosol species with ability interact many aspects Earth system, including radiation, clouds, hydrology, atmospheric chemistry, and biogeochemistry. review focuses on coarse super-coarse aerosols, which we respectively define as diameter 2.5–10 10–62.5 We several lines observational evidence indicating that are transported farther previously expected abundance these is substantially underestimated current global models. synthesize previous studies used observations, theories, model simulations highlight impacts aerosols their effects dust-radiation interactions, dust-cloud Specifically, produce net positive direct radiative effect (warming) at top can modify temperature water vapor profiles, influencing distribution clouds precipitation. In addition, contribute substantial fraction ice-nucleating particles, especially temperatures above –23 °C. They also available reactive surfaces for processing deposition flux land ocean biogeochemistry by supplying important nutrients such iron phosphorus. Furthermore, examine limitations representation remote-sensing retrievals. Because uncertainties simulating offer some recommendations facilitate future studies. Overall, conclude an accurate properties critical understanding system.

Language: Английский

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Historical footprints and future projections of global dust burden from bias-corrected CMIP6 models

npj Climate and Atmospheric Science, Journal Year: 2024, Volume and Issue: 7(1)

Published: Jan. 2, 2024

Abstract Dust aerosols significantly affect the Earth’s climate, not only as a source of radiation, but also ice nuclei, cloud condensation nuclei and thus CO 2 exchange between atmosphere ocean. However, there are large deviations in dust model simulations due to limited observations on global scale. Based ten initial Climate Models Intercomparison Project Phase Six (CMIP6) models, multi-model ensemble (MME) approximately underestimates future changes mass loading (DML) by 7–21%, under four scenarios shared socioeconomic pathways (SSPs). Therefore, this study primarily constrains CMIP6 various emission applying an equidistant cumulative distribution function (EDCDF) method combined with Modern-Era Retrospective Analysis for Research Applications version (MERRA2) datasets based observation assimilation. We find that results (19.0–26.1 Tg) 2000–2014 closer MERRA2 (20.0–24.8 than (4.4–37.5 Tg), deviation reduced up 75.6%. emphasize DML during 2081–2100 is expected increase 0.023 g m –2 North Africa Atlantic region, while decreasing 0.006 Middle East Asia. In comparison internal variability scenario uncertainty, uncertainty accounts more 70% total uncertainty. When bias correction applied, decreases 65% 90%, resulting similar variance contribution variability.

Language: Английский

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Spatial distribution of aerosol microphysical and optical properties and direct radiative effect from the China Aerosol Remote Sensing Network

Atmospheric chemistry and physics, Journal Year: 2019, Volume and Issue: 19(18), P. 11843 - 11864

Published: Sept. 24, 2019

Abstract. Multi-year observations of aerosol microphysical and optical properties, obtained through ground-based remote sensing at 50 China Aerosol Remote Sensing Network (CARSNET) sites, were used to characterize the climatology for representative remote, rural, urban areas over assess effects on climate. The annual mean effective radii total particles (ReffT) decreased from north south rural high particle volumes found sites. depth 440 nm (AOD440 nm) increased sites (0.12) (0.79), extinction Ångström exponent (EAE440–870 0.71 arid semi-arid 1.15 presumably due anthropogenic emissions. Single-scattering albedo (SSA440 ranged 0.88 0.92, indicating slightly strongly absorbing aerosols. Absorption AOD440 values 0.01 versus 0.07 average direct radiative effect (DARE) bottom atmosphere in (−24.40 W m−2) (−103.28 m−2), cooling latter. DARE top −4.79 m−2 −30.05 overall Earth–atmosphere system. A classification method based SSA440 nm, fine-mode fraction (FMF), EAE440–870 showed that coarse-mode (mainly dust) dominant near northwestern deserts, while light-absorbing, important most This study will be understanding climate regional environmental pollution, results provide useful information satellite validation improvement modelling.

Language: Английский

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Aerosol characteristics from earth observation systems: A comprehensive investigation over South Asia (2000–2019)

Remote Sensing of Environment, Journal Year: 2021, Volume and Issue: 259, P. 112410 - 112410

Published: April 8, 2021

The present study summarizes two decades (2000–2019) of climatology and trends in aerosol loading optical properties using a high spatial resolution data obtained from NASA's MODIS MAIAC MISR products supplemented by moderate OMI sensor over South Asia (SA). AOD showed good agreement against AERONET with 68.68% the retrievals falling within expected error Pearson's correlation coefficient (R = 0.83). 20 years geometric mean revealed higher aerosols Indo-Gangetic Plain (IGP) Eastern coast India 30% to 44% compared entire SA. highest under cloud-free conditions was noted during monsoon season, followed pre-monsoon, post-monsoon, winter. contribution coarse-mode (cAOD) mainly natural emission small-mode (sAOD) local anthropogenic emissions are main driver pre-monsoon seasons. Besides, presence humidity season favors hygroscopic growth particles leads values resolutions MODIS/MAIAC enabled identification previously unobserved hotspots Bihar, West Bengal, eastern Indian coastal state Odisha, which is dominated small particles. contributions smaller total were found be post-monsoon winter most states India, Nepal, Bangladesh. In contrast, coarser Pakistan Smaller predominantly retrieved mining industries, including Jharkhand Odisha. A typical dominance absorbing carbonaceous also northwestern region IGP otherwise affected mixed dust statistically significant positive temporal trend observed for whole period, SA region, influenced increase Urban/industrial weakly contributor similarly Central East states. Overall, recent advancements satellite-based potential identify constrain types across highly polluted region.

Language: Английский

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Synergy processing of diverse ground-based remote sensing and in situ data using the GRASP algorithm: applications to radiometer, lidar and radiosonde observations

Atmospheric measurement techniques, Journal Year: 2021, Volume and Issue: 14(3), P. 2575 - 2614

Published: April 1, 2021

Abstract. The exploration of aerosol retrieval synergies from diverse combinations ground-based passive Sun-photometric measurements with collocated active lidar and radiosonde observations using versatile Generalized Retrieval Atmosphere Surface Properties (GRASP) algorithm is presented. Several potentially fruitful aspects observation synergy were considered. First, a set collected during both day- nighttime was inverted simultaneously under the assumption temporal continuity properties. Such an approach explores complementarity information in different results robust consistent processing all observations. For example, interpretation usually suffers lack about particles sizes, shapes complex refractive index. In realized retrievals, propagating nearby provides sufficient constraints for reliable Second, synergetic such complementary enhanced content allows optimizing model used retrieval. Specifically, external mixture several components predetermined composition has been identified as efficient achieving properties situations. This accurate retrievals stand-alone advanced reduced columnar Third, potential observations, situ backscatter sonde explored data KAUST.15 KAUST.16 field campaigns held at King Abdullah University Science Technology (KAUST) August 2015 2016. inclusion demonstrated to provide significant additional validate improve accuracy scope profiling. setups sets are discussed intercompared.

Language: Английский

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Identifying a transport mechanism of dust aerosols over South Asia to the Tibetan Plateau: A case study

The Science of The Total Environment, Journal Year: 2020, Volume and Issue: 758, P. 143714 - 143714

Published: Nov. 14, 2020

Language: Английский

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Aerosol-induced atmospheric heating rate decreases over South and East Asia as a result of changing content and composition

Scientific Reports, Journal Year: 2020, Volume and Issue: 10(1)

Published: Nov. 18, 2020

Abstract Aerosol emissions from human activities are extensive and changing rapidly over Asia. Model simulations satellite observations indicate a dipole pattern in aerosol loading between South Asia East Asia, two of the most heavily polluted regions world. We examine previously unexplored diverging trends existing aerosols using high quality, two-decade long ground-based time series properties Robotic Network (AERONET), satellites (Moderate Resolution Imaging Spectroradiometer (MODIS) Ozone Monitoring Instrument (OMI)), model (Modern-Era Retrospective Analysis for Research Applications, version 2 (MERRA-2). The data cover period since 2001 Kanpur (South Asia) Beijing (East Asia), locations taken as being broadly representative respective regions. Since 2010 optical depth (AOD) is maintained, but trend reversed—the decrease AOD rapid 2010, 17% less current decade compared to first twenty-first century, while increased by 12% during same period. Furthermore, we find that composition also time. single scattering albedo (SSA), measure aerosol’s absorption capacity related composition, slightly higher than Kanpur, has 0.91 2002 0.93 2017 0.89 0.92 confirming this region have on an average become more nature. These changes led notable aerosol-induced atmospheric heating rate (HR) both decades, decreasing considerably (− 31%) 9%). annual mean HR lower now, it still large (≥ 0.6 K per day), which significant climate implications. seasonal AOD, SSA pronounced their caused mainly increase/decrease anthropogenic (sulfate, black carbon organic carbon) natural (dust sea salt) did not change significantly last decades. MERRA-2 able simulate observed AODs well magnitude, values or well. robust findings based key parameters unrecognized need be accounted state-of-the-art models ensure accurate quantification complex evolving impact regional

Language: Английский

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Identifying the dominant local factors of 2000–2019 changes in dust loading over East Asia

The Science of The Total Environment, Journal Year: 2021, Volume and Issue: 777, P. 146064 - 146064

Published: Feb. 25, 2021

Language: Английский

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