Atmospheric aerosol spatial variability: Impacts on air quality and climate change

One Earth, Journal Year: 2025, Volume and Issue: 8(3), P. 101237 - 101237

Published: March 1, 2025

Language: Английский

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Aerosol spectral optical properties in the Paris urban area and its peri-urban and forested surroundings during summer 2022 from ACROSS surface observations

Atmospheric chemistry and physics, Journal Year: 2025, Volume and Issue: 25(5), P. 3161 - 3189

Published: March 14, 2025

Abstract. The complex refractive index (CRI; n−ik) and the single scattering albedo (SSA) are key parameters driving aerosol direct radiative effect. Their spatial, temporal, spectral variabilities in anthropogenic–biogenic mixed environments poorly understood. In this study, we retrieve CRI SSA (370–950 nm wavelength range) from situ surface optical measurements number size distribution of submicron aerosols at three sites greater Paris area, representative urban city, as well its peri-urban forested rural environments. Measurements were taken part ACROSS (Atmospheric Chemistry Suburban Forest) campaign June–July 2022 under diversified conditions: (1) two heatwaves leading to high levels, (2) an intermediate period with low concentrations, (3) episode long-range-transported fire emissions. retrieved exhibit urban-to-rural gradient, whose intensity is modulated by weather conditions. A full average 1.41−0.037i (urban), 1.52−0.038i (peri-urban), 1.50−0.025i (rural) retrieved. imaginary (k) increases decreases forest when exposed influence plume. Values k > 0.1 < 0.6 520 related a black carbon mass fraction larger than 10 %. Organic found contribute more 50 % up 17 22 (forest) absorption coefficient 370 nm. value 0.022 (370 nm) was measured site for episode.

Language: Английский

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Modelling of atmospheric variability in gas and aerosols during the ACROSS campaign 2022 of the greater Paris area: evaluation of the meteorology, dynamics and chemistry

Atmospheric chemistry and physics, Journal Year: 2025, Volume and Issue: 25(9), P. 4803 - 4831

Published: May 9, 2025

Abstract. Understanding the interaction of anthropogenic and biogenic emissions around large urban agglomerations remains an important question for atmospheric research key ACROSS (Atmospheric Chemistry Suburban Forest) project. is based on intensive field campaign in Paris area, including ground-based measurements inner centre suburban forested sites made board aircraft, during exceptionally hot dry summer 2022. In addition, 3D modelling represents tool ACROSS, here we use available from together with observations air quality meteorological networks to evaluate WRF–CHIMERE model simulation period. We find that WRF able reproduce variability campaign, particular two heatwaves. The reproduces daily ozone maxima well but overestimates PM2.5 by a factor 1.5–2, partly due overestimation secondary aerosol, both organic inorganic. For aerosol Île-de-France biases are reduced about ±20 %. These differences contrast those existing literature might have been increased conditions case studies heatwave days, shows sources peaks above 20–30 µg m−3, one occasion formation different forests another advection wildfire aerosols combination mainly forest-emitted volatile compounds (BVOCs).

Language: Английский

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Two decades of high-resolution aerosol product over the Sierra Nevada Mountain region (SE Spain): Spatio-temporal distribution and impact on ecosystems

Atmospheric Research, Journal Year: 2024, Volume and Issue: 308, P. 107515 - 107515

Published: June 5, 2024

Atmospheric aerosols play a pivotal role in shaping our environment, impacting climate, human health, and ecosystems. Characterizing the influence of on ecosystems, especially mountain environments, is challenging task due to their complex-orography scarcity aerosol ground stations. Satellite-based data can improve knowledge over such areas. Thus, we have analyzed Aerosol Optical Depth (AOD) product from MODerate resolution Imaging Spectrometer (MODIS) sensor produced by inversion algorithm MultiAngle Implementation Correction (MAIAC) last two decades for period 2001–2022 with spatial 1 × km. Our study focuses Sierra Nevada Mountain region National Park Southeastern Spain. As first step, validated AOD MODIS+MAIAC against three AERONET stations at different altitudes (680 m, 1800 2500 m above sea level (a.s.l.)). showed good agreement ground-based observations, R values ranging 0.75 0.82, RMSE 0.047 0.066 having 80% samples within expected error (EE) product. The able characterize fine-scale features area hence evaluate spatio-temporal distribution mountainous region. We generated most extended dataset region, spanning past decades. deepened into seasonal patterns 2001 2022, unveiling elevated near valleys urban In general, decrease increasing altitude exception snow-covered areas high (>2800 a.s.l.), which might affect retrieval provide bias higher-reflecting surfaces pixel removal. For time, relationship loading ecosystem type has been assessed protected environment Natural Park. Monthly trends across types altitudinal ranges are detail addition, Generalized Linear Models (GLM) applied reveal significant correlations between ecosystems AOD, irrespective altitude, latitude or longitude. Based interannual variation decades, 500 elevation ranges. ecosystem's maintained 1200–1700 1700–2200 a.s.l., demonstrates that land-type an impact Furthermore, it observed forest-like tend present lower compared bare-soil low-growth vegetation closer Granada city generalized higher western part mountain, regardless ecosystem, showing proximity sites potential environment.

Language: Английский

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Multi-Decadal Trends in Aerosol Optical Depth of the Main Aerosol Species Based on MERRA-2 Reanalysis: A Case Study in the Baltic Sea Basin

Remote Sensing, Journal Year: 2024, Volume and Issue: 16(13), P. 2421 - 2421

Published: July 1, 2024

This study analyses the trends of total aerosol and main species over nine capitals in Baltic Sea basin from 1989 to 2019 based on Modern-Era Retrospective Analysis for Research Applications, Version 2 Reanalysis. Aerosol speciation includes mineral dust, sea salt, sulphate (SO4), organic carbon (OC), black (BC). The mean optical depth (AOD) values were highest (up 0.216) continental (i.e., Warsaw, Berlin, Vilnius). For each capital, SO4 AOD was species, with a trend specular AOD. Apart BC lowest level. composition aerosols changed respect anthropogenic origins SO4, OC, BC), percentage contribution decreasing increasing Also, OC showed an increase Copenhagen, Oslo, Stockholm, capitals. Anthropogenic contributed up 90.3% AOD, minimum between 2007 2008, likely due global financial crisis. as decreased 2008. Both AODs capital. By contrast, increased both Oslo. decoupling carbonaceous concurrent factors such biomass burning low-sulphur fuel policies. From 2000 2019, inverse relationships gross domestic products suggest relative economic growth fossil fuels Tallinn, Vilnius.

Language: Английский

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How strong are the links between global warming and surface solar radiation changes?

Climatic Change, Journal Year: 2024, Volume and Issue: 177(10)

Published: Oct. 1, 2024

Language: Английский

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Synoptic Scale Controls and Aerosol Effects on Fog and Low Stratus Life Cycle Processes in the Po Valley, Italy

Geophysical Research Letters, Journal Year: 2024, Volume and Issue: 51(20)

Published: Oct. 24, 2024

Abstract Fog and low stratus clouds (FLS) form as a result of complex interactions multiple factors in the atmosphere at land surface impact both anthropogenic natural environments. Here, we analyze role synoptic conditions aerosol loading on FLS occurrence persistence Po valley northern Italy. By applying k‐means clustering to reanalysis data, find that formation is either based radiative processes or moisture advection from Mediterranean sea. Satellite‐based data shows longer radiatively formed events, likely due air mass stagnation temperature inversion. Ground‐based optical depth observations further reveal event duration significantly higher under high loading. The results underline combined effect topography, life cycle valley.

Language: Английский

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Contrasting nature of aerosols over South Asian cities and its surrounding environment

Environmental Pollution, Journal Year: 2024, Volume and Issue: 360, P. 124622 - 124622

Published: July 29, 2024

Language: Английский

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Air Quality Improvement Following the COVID-19 Pandemic Lockdown in Naples, Italy: A Comparative Analysis (2018–2022)

Environments, Journal Year: 2024, Volume and Issue: 11(8), P. 167 - 167

Published: Aug. 6, 2024

The pandemic lockdown of the year 2020 has been generally accompanied by an improvement in air quality. Here, we report data on effects limitations quality metropolitan area Naples (Italy) following evolution main atmospheric pollutants over a five-year period and comparing their concentrations with previous (2018 2019) (2021 2022) two years. In particular, NO2 PM10 registered representative sampling station network columnar features aerosol characterized sun-photometer are considered. To avoid possible influence Saharan dust transport, which affects observational area, analysis limited to days free from such events. Our findings evidence tendency towards pre-pandemic conditions, notwithstanding some differences related partial temporary restrictions imposed even 2021. For both near-surface PM, observations confirm significant reduction induced 2020, besides seasonal changes, gradual more typical values Also, clearly highlight recovery conditions 2021 2022, confirming peculiar effect characteristics that evidences striking predominance fine component.

Language: Английский

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COVID lockdowns significantly affect statewide atmospheric fine aerosols in India after excluding long-term pollution patterns and time-lag effect

Atmospheric Environment, Journal Year: 2024, Volume and Issue: unknown, P. 121013 - 121013

Published: Dec. 1, 2024

Language: Английский

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