Monitoring and simulation of a 7-day dust episode and associated dust radiative forcing over the Middle East via synergy of satellite observations, reanalysis datasets and regional/numerical models

Atmospheric Research, Journal Year: 2025, Volume and Issue: unknown, P. 107948 - 107948

Published: Jan. 1, 2025

Language: Английский

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On the Middle East's severe dust storms in spring 2022: Triggers and impacts

Atmospheric Environment, Journal Year: 2022, Volume and Issue: 296, P. 119539 - 119539

Published: Dec. 23, 2022

Large amounts of dust in the air can disrupt daily activities and pose a threat to human health. In May 2022, consecutive major storms occurred over Middle East resulting severe environmental, social health impacts. this study, we investigate exceptional factors driving these effects clouds. Using combination satellite, in-situ reanalysis datasets, identify atmospheric triggers for occurrence storms, characterize their three-dimensional structure evaluate radiative impact. The emission was promoted by density currents emanating from deep convection Turkey. convective systems were triggered cut-off lows mid-latitudes fed moisture African rivers. Data Infrared Atmospheric Sounding Interferometer (IASI) showed that clouds transported southward at 4 km altitudes but sunk ground levels when they reached southern Arabian Peninsula due strong subsidence. At station coastal UAE, caused 350 W m−2 drop surface downward shortwave flux 70 increase longwave one during episodes. This contributed 9 °C nighttime temperatures which exacerbated heat population. newly highlighted mechanism East, low interacts with an river, as well direct observations impact on budget contribute reducing associated uncertainties climate models.

Language: Английский

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Particulate Matter in the American Southwest: Detection and Analysis of Dust Storms Using Surface Measurements and Ground-Based LIDAR

Atmosphere, Journal Year: 2024, Volume and Issue: 15(1), P. 110 - 110

Published: Jan. 16, 2024

This research study focuses on the coupling between particulate matter and planetary boundary layer. Particulate affects human health it is a complex mixture of suspended substances. Various sources include volcanic eruptions, soil lofted by strong winds, wildfires, particles formed from chemical reactions gas-phase emissions. Strong winds are one source dust pollution when they loft particles. layer closely linked. The plays critical role in meteorology concentrations due to its involvement energy, latent heat, mass transfer with free troposphere. Currently, there has been no impact events our region, El Paso, Texas, which located biggest Western Hemisphere, Chihuahuan Desert. In this study, we used PM10 detect during 2016–2022 period Paso region. During period, observed 74 events. were categorized as synoptic or convective cases. Synoptic cases associated cold fronts, while local systems such thunderstorms. We that occurred most frequently springtime, more frequent summer monsoon months. tend occur earlier afternoon lower temperatures, late evening higher temperatures. also found height collapsed after maximum hourly concentration then returned original height.

Language: Английский

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Conducive circulation patterns and transport mechanisms for spring dust from Taklimakan Desert to the Tibetan Plateau

Environment International, Journal Year: 2025, Volume and Issue: 197, P. 109356 - 109356

Published: March 1, 2025

Dust aerosols have an impact on both public health and environmental health. The Taklimakan Desert (TD) serves as a significant source of high-altitude airborne dust over the Tibetan Plateau (TP). However, systematic understanding its transport mechanism requires further exploration beyond isolated case studies. This study effectively identified atmospheric circulation patterns mechanisms that facilitate movement from TD to TP in spring, utilizing obliquely rotated principal component analysis alongside various reanalysis satellite datasets. findings indicate out five patterns, three - specifically northwest high-pressure (NWH), northern with warm anomaly (NH-W), cold (NH-C) favor occurrence storms TD. In NWH NH-W is transported northeastern northwestern central result interaction between dynamic, thermal, terrain factors. process features elevated boundary layer, increased temperature, steeper temperature lapse rate, more surface sensible heat flux contrast, NH-C pattern restricts due presence downdrafts along north slope TP, reduced layer stable stratification research provides valuable insights into crucial function transporting which beneficial for assessing condition cryosphere developing protection strategies.

Language: Английский

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Surface-Dependent Meteorological Responses to a Taklimakan Dust Event During Summer near the Northern Slope of the Tibetan Plateau

Remote Sensing, Journal Year: 2025, Volume and Issue: 17(9), P. 1561 - 1561

Published: April 28, 2025

The northern slope of the Tibetan Plateau (TP) is crucial affected area for dust originating from Taklimakan Desert (TD). However, few studies have focused on meteorological element responses to TD over different surface types near TP. Satellite data and Weather Research Forecasting model coupled with chemistry (WRF-Chem) were used analyze being transported TP its effect 30 July 2 August 2016. In TD, middle-upper layer weakened solar radiation reaching lower layer, which reduced temperature within planetary boundary (PBL) during daytime. At night, dust’s thermal preservation increased temperatures PBL decreased at approximately 0.5 2.5 km above PBL. without snow cover, concentration was one-fifth while cooling intensity comparable TD. PBL, thickness allowed heat atmospheric continuously throughout day. diminished albedo, elevating 6 km, hastening melting, absorbed latent water vapor content, consequently decreasing below km. Surface varied significantly across types. m (T2) by 0.4 °C daytime, opposite nighttime variation. T2 predominantly warming. snow-covered TP, day, a maximum 1.12 height up 258 m. Additionally, supplementary simulation event 17 June 19 2016 further validated our findings. elements response concentration, thickness, type, significant day–night differences, suggesting that distribution should be considered in improve accuracy climate predictions.

Language: Английский

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Multi-layered physical factors govern mercury release from soil: Implications for predicting the environmental fate of mercury

Journal of Environmental Management, Journal Year: 2024, Volume and Issue: 352, P. 120024 - 120024

Published: Jan. 12, 2024

Despite the recognised risks of human exposure to mercury (Hg), drivers gaseous elemental (GEM) emissions from soil remain understudied. In this study, we aimed identify environmental parameters that affect GEM flux and derive correlations between flux. Principal component analysis (PCA), factor (FA), structural equation modelling (SEM) were performed on samples forest non-forest sites. The associated results revealed impact each parameter flux, either due interaction or as a coherent set parameters. An introductory correlation matrix examining relationship two components showed negative atmospheric pressure at sites, well strong temperature. cases open sites with no trees, PCA FA consistent, indicating pressure, solar irradiance, moisture-defined primary causality-are largely independent contrast, for areas high humidity, tree coverage, shade inconsistent, confirming hypothesis causality affects rather than consequent driven by causality, such air temperature humidity. SEM provided further evidence crucial This study demonstrates importance key parameters, moisture content, can be used predict release soils, Monitoring magnitude these alone may facilitate estimation soils useful detailed soil-air Hg exchange.

Language: Английский

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Inverse effects of aerosol radiative forcing on heavy PM2.5 pollution of local accumulation and regional transport over Central China

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 917, P. 170319 - 170319

Published: Jan. 25, 2024

Language: Английский

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Biological and dust aerosol as sources of ice nucleating particles in the Eastern Mediterranean: source apportionment, atmospheric processing and parameterization

Published: Feb. 27, 2024

Abstract. Aerosol-cloud interactions in mixed-phase clouds (MPCs) are one of the most uncertain drivers hydrological cycle and climate change. A synergy in-situ, remote sensing modelling experiments was used to determine source ice nucleating particles (INPs) for MPCs at Mount Helmos Eastern Mediterranean. The influences boundary layer turbulence, vertical aerosol distributions meteorological conditions were also examined. When observation site is Free Troposphere (FT), approximately 1 106 serve as INPs. INP abundance spans three orders magnitude increases following order marine aerosols, continental finally, dust plumes. Biological important INPs observed whereas they play a secondary yet role even during Saharan events. Air masses planetary (PBL) show both enriched concentrations higher proportion comparison total particles, different from cases FT. presence precipitations/clouds enriches FT but decreases PBL. Additionally, new parameterizations, incorporating ratio fluorescent-to-nonfluorescent or coarse-to-fine predicting >90 % within an uncertainty range factor 10, exhibit better performance than current widely-used allow formation models respond variations biological particles. improved parameterizations can help MPC simulations regions with various sources prevailing sources.

Language: Английский

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Sway of aerosol on Atmospheric Boundary Layer influencing air pollution of Delhi

Urban Climate, Journal Year: 2023, Volume and Issue: 49, P. 101478 - 101478

Published: March 15, 2023

Language: Английский

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Analysis of Height of the Stable Boundary Layer in Summer and Its Influencing Factors in the Taklamakan Desert Hinterland

Remote Sensing, Journal Year: 2024, Volume and Issue: 16(8), P. 1417 - 1417

Published: April 17, 2024

Stable boundary layer height (SBLH) is an important parameter to characterize the characteristics and vertical structure of nocturnal lower atmosphere at night. The distribution SBLH has obvious spatial temporal differences, there are many meteorological factors affecting SBLH, but present, few quantitative studies on effects near-surface in desert hinterland. This study was based GPS sounding balloon data, observation ERA5 data from Tazhong Station (TZ) Taklamakan Desert (TD) collected July 2017, 2019, 2021. variation its relationship with described. We quantitatively analyzed degree influence verified it using a model. also elucidates possible formation mechanism TD hinterland trended upward 2021, which consistent changes factors, according data. Therefore, we think that inherent connection exists between SBLH. results correlation analysis show complex internal connections interactions exist among near ground; some thermal, dynamic, other strongly correlate Having established change (ΔSBLH) major (Δ), linear regression equation them revealed can affect dynamic have stronger ΔSBLH than thermal factors. model validation variable importance projection (VIP) confirmed jointly affected by impact. through forms relatively complex. At night, surface radiative cooling promotes inversion layer, low-level jets strengthen wind shear, reducing atmospheric stability. combined heat dynamics play role dynamically shaping helps us accurately predicting understanding influencing hinterland, providing reference for this area. same time, provides scientific basis regional weather climate simulation, disaster defense, air quality forecasting, parameterization improvement.

Language: Английский

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