Climate Dynamics, Journal Year: 2020, Volume and Issue: 54(9-10), P. 3977 - 3989
Published: March 21, 2020
Language: Английский
Atmospheric chemistry and physics, Journal Year: 2020, Volume and Issue: 20(11), P. 6479 - 6493
Published: June 5, 2020
Abstract. The urban heat island intensity (UHII) is the temperature difference between areas and their rural surroundings. It commonly attributed to changes in underlying surface structure caused by urbanization. Air pollution aerosol particles can affect UHII through changing (1) energy balance radiative effect (ARE) (2) planetary-boundary-layer (PBL) stability airflow modifying thermodynamic structure, which referred as dynamic (ADE). By analyzing satellite data ground-based observations collected from 2001 2010 at 35 cities China using WRF-Chem model, we find that impact of aerosols on differs considerably: reducing summer but increasing winter. This seasonal contrast proposed be different strengths ARE ADE In summer, dominant over ADE, cooling down more strongly than because much higher loading, offsets heating, therefore weakening UHII. winter, however, dominant, stabilize PBL polluted condition, near-surface transport both vertical horizontal directions. means accumulated dispersed less effectively, thus enhanced. These findings shed new light interaction urbanization-induced air climate.
Language: Английский
Citations
79
Remote Sensing, Journal Year: 2020, Volume and Issue: 12(3), P. 546 - 546
Published: Feb. 7, 2020
Vertical wind shear (VWS) is one of the key meteorological factors in modulating ground-level particulate matter with an aerodynamic diameter 2.5 µm or less (PM2.5). Due to lack high-resolution vertical measurements, how VWS affects PM2.5 remains highly debated. Here we employed profiling observations from fine-time-resolution radar profiler (RWP), together hourly explore features planetary boundary layer (PBL) and their association aerosols Beijing for period December 1, 2018, February 28, 2019. Overall, southerly anomalies almost dominated throughout whole PBL even beyond under polluted conditions during course a day, as totally opposed northerly clean conditions. Besides, pollution exhibited strong dependence on VWS. A much weaker was observed lower part conditions, compared that which could be due accumulation induced by weak mixing PBL. Notably, northbound transboundary mainly appeared within PBL, where relatively small dominated. Above northerlies winds also favored long-range transport aerosols, turn deteriorated air quality well. This well corroborated synoptic-scale circulation backward trajectory analysis. Therefore, argued here not only speed but were important investigation aerosol formation mechanism Beijing. Also, our findings offer wider insights into role RWP variation PM2.5, deserves explicit consideration forecast future.
Language: Английский
Citations
71
Atmospheric chemistry and physics, Journal Year: 2020, Volume and Issue: 20(22), P. 14163 - 14182
Published: Nov. 23, 2020
Abstract. Changes in land cover and aerosols resulting from urbanization may impact convective clouds precipitation. Here we investigate how Houston can modify sea-breeze-induced cloud precipitation through the urban effect anthropogenic aerosol effect. The simulations are carried out with Chemistry version of Weather Research Forecasting model (WRF-Chem), which is coupled spectral-bin microphysics (SBM) multilayer a building energy (BEM-BEP). We find that (the joint both aerosols) notably enhances storm intensity (by ∼ 75 % maximum vertical velocity) (up to 45 %), more significant than Urban modifies evolution: speed up transition warm mixed-phase cloud, thus initiating surface rain earlier but slowing down cell dissipation, all result heating-induced stronger sea-breeze circulation. becomes evident after evolves into accelerating development deep by 40 min. Through aerosol–cloud interaction (ACI), boost mainly activating numerous ultrafine particles at stages. This work shows importance considering effects for understanding on
Language: Английский
Citations
71
Geophysical Research Letters, Journal Year: 2022, Volume and Issue: 49(4)
Published: Feb. 8, 2022
Under global warming, projected changes in precipitation have shown an asymmetrical shift from light to heavy over China. However, the role of urbanization this remains unknown. Here, we show that increases total rainy-season (May-September) Yangtze River Delta (YRD) urban agglomeration East China are characterized by decreasing and increasing during 1961–2019. This toward heavier is even more prominent than rural areas. Areas with faster expansion rates exhibit stronger negative (positive) trends (heavy) precipitation. Urbanization contributes 44.4% (26.4%) (increasing) areas YRD. We suggest managers should consider potential adverse impacts shift, which may favor both frequency heatwaves waterlogging.
Language: Английский
Citations
54
Remote Sensing, Journal Year: 2022, Volume and Issue: 14(3), P. 558 - 558
Published: Jan. 25, 2022
Previous studies have shown that dust aerosols may accelerate the melting of snow and glaciers over Tibetan Plateau. To investigate vertical structure aerosols, we conducted a ground-based observation by using multi-wavelength polarization lidar which is designed for continuous network measurements. In this study, used from September to October 2020 at Ruoqiang site (39.0°N, 88.2°E; 894 m ASL), located junction Taklimakan Desert–Tibetan Our results showed can be lifted up 5 km ground, comparable with elevation Plateau in autumn mass concentration 400–900 μg m−3. Moreover, particle depolarization ratio (PDR) 532 nm 355 are 0.34 ± 0.03 0.25 0.04, respectively, indicating high degree non-sphericity shape. addition, extinction-related Ångström exponents very small (0.11 0.24), implying large values size. Based on observation, study proved coarse non-spherical transported Plateau, suggesting its possible impacts regional climate ecosystem.
Language: Английский
Citations
45
Climate Dynamics, Journal Year: 2022, Volume and Issue: 59(7-8), P. 2481 - 2497
Published: March 13, 2022
Language: Английский
Citations
45
Atmospheric Environment, Journal Year: 2020, Volume and Issue: 234, P. 117583 - 117583
Published: May 8, 2020
Language: Английский
Citations
63
Atmospheric chemistry and physics, Journal Year: 2020, Volume and Issue: 20(21), P. 13379 - 13397
Published: Nov. 11, 2020
Abstract. The joint effects of aerosol, thermodynamic, and cloud-related factors on cloud-to-ground lightning in Sichuan were investigated by a comprehensive analysis ground-based measurements made from 2005 to 2017 combination with reanalysis data. Data include aerosol optical depth, (CG) density, convective available potential energy (CAPE), mid-level relative humidity, lower- mid-tropospheric vertical wind shear, cloud-base height, total column liquid water (TCLW), ice (TCIW). Results show that CG density aerosols are positively correlated the plateau region negatively basin region. Sulfate found be more strongly associated than aerosols, so this study focuses role sulfate activity. In region, lower concentration stimulates activity through microphysical effects. Increasing loading decreases cloud droplet size, reducing collision–coalescence efficiency inhibiting warm-rain process. More small droplets transported above freezing level participate process, forming particles releasing latent heat during Thus, an increase increases CAPE, TCLW, TCIW, stimulating contrast, higher inhibits radiative effect. An reduces amount solar radiation reaching ground, thereby lowering CAPE. intensity convection decreases, resulting less supercooled being fewer forming, increasing content. suppresses
Language: Английский
Citations
55
Optics Express, Journal Year: 2021, Volume and Issue: 29(15), P. 23461 - 23461
Published: June 26, 2021
Accurate identification of aerosols and cloud from remote sensing observations is importance for quantitatively evaluating their radiative forcing related impacts. Even though polarization lidar has exhibited a unique advantage classifying atmospheric clouds over the past several decades, measurements are often achieved at one wavelength (UV or VIS) using laser sensing. To better identify types clouds, we developed ground-based dual-polarization system that can simultaneously detect wavelengths 355 nm 532 nm. Our results show volume depolarization ratios (VDRs) markedly differ typical in atmosphere. For non-spherical particles, ratio VDRs 2.87 ± 1.35 ice 1.51 0.29 dust-dominated aerosols, respectively. However, spherical 0.43 0.26 water 0.56 0.05 air pollutants. Consequently, proposed simple reliable method observed by system. The first distinguishes combination color (CR, nm/355 nm) attenuated backscattering coefficients (ABC) Then, subtypes identified based on showed remarkably improve classification compared with traditional method. This study illustrates more information be obtained multiple active
Language: Английский
Citations
45
Land, Journal Year: 2022, Volume and Issue: 11(2), P. 176 - 176
Published: Jan. 21, 2022
Dust emission is an important corollary of the soil degradation process in arid and semi-arid areas worldwide. Soil organic carbon (SOC) main terrestrial pool cycle, dust redistributes SOC within ecosystems to atmosphere oceans. This redistribution plays role global cycle. Herein, we present a systematic review modelling, budgets, effects on dynamics. Focusing selected models developed past five decades at different spatio-temporal scales, discuss sources, sinks, budgets identified by these effect emissions We obtain following conclusions: (1) have made considerable progress, but there are still some uncertainties; (2) set parameters should be for use regions, direct anthropogenic considered estimations; (3) involvement cycle crucial improving accuracy assessment.
Language: Английский
Citations
36