Three-dimensional climatology, trends, and meteorological drivers of global and regional tropospheric type-dependent aerosols: insights from 13 years (2007–2019) of CALIOP observations

Atmospheric chemistry and physics, Journal Year: 2021, Volume and Issue: 21(19), P. 15309 - 15336

Published: Oct. 14, 2021

Abstract. Globally gridded aerosol extinction data from the Cloud–Aerosol Lidar with Orthogonal Polarization (CALIOP) during 2007–2019 are utilized to investigate three-dimensional (3D) climatological distribution of tropospheric type-dependent aerosols and identify trends in column optical depth (AOD), partitioned within different altitude regimes, their meteorological drivers. Using detection samples layer aerosols, we also yield a 3D frequency occurrence (FoO) subtypes classified by CALIOP. The results show that coefficient (AEC) shows contrasting vertical patterns over land ocean, former possessing significant geographical dependence, while enhancement AEC latter is mainly located below 1 km. structures AECs, however, strongly dependent on altitude. When total AOD (TAOD) into planetary boundary (PBL) free troposphere (FT), demonstrate PBL FT contribute 62.08 % 37.92 %, respectively, global TAOD averaged daytime nighttime. Yet this CALIOP-based partitioning varies significantly. Among all 12 typical regions interest analyzed, more than 50 lower (0–2 km), contribution less 2 above 6 In average terms, found FoO layers 4.45 largest “clean marine” (1.79 %) smallest continental” (0.05 %). Overall, exhibit pattern similar AEC. resulting trend analyses CALIOP accurately captures regional anomalies TAOD, as observed other satellite measurements reanalysis. Our correlation analysis between factors suggests interannual variability related precipitation (PPT), volumetric soil moisture (VSM), wind speed (WS) particular regions. For instance, positive equatorial central Pacific attributable increased PPT decreased WS. contrast, dry convective dominated dust smoke, variability/trend largely modified VSM driven PPT. Additionally, further these correlations robust significantly weakened or even reversed FT. This highlights superiority using proxy variable for widely applied explore relationships atmospheric pollution meteorology.

Language: Английский

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Recent Progress in Atmospheric Chemistry Research in China: Establishing a Theoretical Framework for the “Air Pollution Complex”

Advances in Atmospheric Sciences, Journal Year: 2023, Volume and Issue: 40(8), P. 1339 - 1361

Published: April 28, 2023

Atmospheric chemistry research has been growing rapidly in China the last 25 years since concept of "air pollution complex" was first proposed by Professor Xiaoyan TANG 1997. For papers published 2021 on air (only included Web Science Core Collection database were considered), more than 24 000 authored or co-authored scientists working China. In this paper, we review a limited number representative and significant studies atmospheric few years, including (1) sources emission inventories, (2) chemical processes, (3) interactions with meteorology, weather climate, (4) between biosphere atmosphere, (5) data assimilation. The intention not to provide complete all progress made but rather serve as starting point for learning about advances reviewed paper have enabled theoretical framework complex be established, provided robust scientific support highly successful control policies China, created great opportunities education, training, career development many graduate students young scientists. This further highlights that developing low-income countries are heavily affected can benefit from these advances, whilst at same time acknowledging challenges still remain hopefully addressed over next decades.

Language: Английский

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Dust and climate interactions in the Middle East: Spatio-temporal analysis of aerosol optical depth and climatic variables

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 927, P. 172176 - 172176

Published: April 2, 2024

The Middle East (ME) is grappling with an alarming increase in dust levels, measured as aerosol optical depth (AOD), which poses significant threats to air quality, human health, and ecological stability. This study aimed investigate correlations between climate non-climate driving factors AOD the ME over last four-decade (1980–2020), based on analysis of three variables: actual evapotranspiration (AET), potential (PET), precipitation (P). A comprehensive conducted discern patterns trends, a particular focus regions such Rub al-Khali, Ad-Dahna, An-Nafud Desert, southern Iraq, where consistently high levels were observed. 77 % area classified arid or semi-arid aridity index. Our results indicate upward trend Iran, Yemen, Saudi Arabia. We noted increasing AET Euphrates Tigris basin, northern-Iran, Nile region, along rising PET zones Syria. Conversely, P showed notable decrease northern-Iraq, Syria, southwestern southern-Turkey. Comparison long-term changes (10-year moving averages) consistent decreasing all regions. Utilizing Budyko space-based analysis, we found that climatic mainly influence much East, while non-climatic have strong impact certain areas like Tigris-basin, northern-Iran. experiences complex intricate interactions events their drivers. To address this issue, multi-system approach necessary, considers both Moreover, efficient control strategy should include soil water conservation, advanced monitoring, public awareness campaigns involve regional international collaboration.

Language: Английский

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A global-scale analysis of the MISR Level-3 aerosol optical depth (AOD) product: Comparison with multi-platform AOD data sources

Atmospheric Pollution Research, Journal Year: 2021, Volume and Issue: 12(12), P. 101238 - 101238

Published: Oct. 29, 2021

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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Retrieval of total and fine mode aerosol optical depth by an improved MODIS Dark Target algorithm

Environment International, Journal Year: 2022, Volume and Issue: 166, P. 107343 - 107343

Published: June 11, 2022

Total and fine mode aerosol optical depth (AODT AODF), as well the fraction (FMF = AODF/AODT), are critical variables for climate change atmospheric environment studies. The retrievals with high accuracy from satellite observations, particularly FMF AODF over land, remain challenging. This study aims to improve Moderate-resolution Imaging Spectro-radiometer (MODIS) land dark target (DT) algorithm retrieving AODT, AODF, on a global scale. Based fact that underestimated surface reflectance (SR) could overestimate AODT underestimate size parameter in DT algorithm, two robust schemes were developed SR determination: first (NEW1 DT) used top of atmosphere instead at 2.12 µm; second (NEW2 eleven-year MODIS data establish monthly spectral relationship model (2.12-0.47 2.12-0.65 µm) database pixel-by-pixel Then novel lookup table approach based physical process was proposed retrieve FMF. new FMF, compared AERosol RObotic NETwork (AERONET) retrievals. Results showed root mean square error (RMSE) 0.096-0.103, 0.098-0.099, 0.167-0.180 AODTs, AODFs, FMFs, respectively, which better than Collection 6.1 (C6.1) (0.117, 0.235, 0.426) validation by AERONET sites. From results, NEW2 provided coarse AOD retrievals, while NEW1 had performances. spatial patterns AODC algorithms comparable those Polarization Directionality Earth's Reflectances product. Hence, have potential provide products scientific community using long-term data.

Language: Английский

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Climatology of aerosol component concentrations derived from multi-angular polarimetric POLDER-3 observations using GRASP algorithm

Earth system science data, Journal Year: 2022, Volume and Issue: 14(7), P. 3439 - 3469

Published: July 29, 2022

Abstract. The study presents a climatology of aerosol composition concentrations obtained by recently developed algorithm approach, namely the Generalized Retrieval Atmosphere and Surface Properties (GRASP)/Component. It is applied to whole archive observations from POLarization Directionality Earth's Reflectances (POLDER-3). conceptual specifics GRASP/Component approach in direct retrieval speciation (component fraction) without intermediate retrievals optical characteristics. Although global validation derived component product challenging, results are line with general knowledge about types different regions. In addition, we compare GRASP-derived black carbon (BC) dust components those Modern-Era Retrospective Analysis for Research Applications, version 2 (MERRA-2) product. Quite reasonable agreement was found between spatial temporal distribution species provided GRASP MERRA-2. differences, however, appeared regions known strong biomass burning emissions; reasons discrepancies discussed. other components, such as absorbing (BC, brown (BrC), iron-oxide content mineral dust) scattering (ammonium sulfate nitrate, organic carbon, non-absorbing aerosols, represent scarce but imperative information potential adjustment chemical transport models. properties (e.g., depth (AOD), Ångström exponent (AE), single-scattering albedo (SSA), fine- coarse-mode (AODF AND AODC)) were agree well Aerosol Robotic Network (AERONET) ground reference data, fully consistent previous Optimized, High Precision (HP) Models versions POLDER-3 data. Thus, presented extensive provides an opportunity understanding variabilities trends regional distributions species. addition additional valuable, qualitatively new insight and, therefore, demonstrates advantages multi-angular polarimetric (MAP) satellite next frontier inversion advanced observations. satellite-based dataset expected be useful improving emissions component-resolved radiative forcing estimations. products publicly available (https://www.grasp-open.com/products/, last access: 15 March 2022) used current registered under https://doi.org/10.5281/zenodo.6395384 (Li et al., 2022b).

Language: Английский

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Effects of emission reductions on major anthropogenic aerosol-radiation-cloud interactions in East Asia in winter during 2007–2020

Atmospheric Environment, Journal Year: 2024, Volume and Issue: 327, P. 120499 - 120499

Published: April 8, 2024

Language: Английский

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Space–Time Evaluation of Atmospheric Black Carbon in Chinese Urban Environment: Influence of Land Use and Air Pollution Policies

Earth Systems and Environment, Journal Year: 2024, Volume and Issue: 8(2), P. 501 - 519

Published: Feb. 28, 2024

Language: Английский

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Spatio-temporal changes of spring-summer dust AOD over the Eastern Mediterranean and the Middle East: Reversal of dust trends and associated meteorological effects

Atmospheric Research, Journal Year: 2022, Volume and Issue: 281, P. 106509 - 106509

Published: Nov. 11, 2022

Language: Английский

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