Vertical distribution of PM2.5 and interactions with the atmospheric boundary layer during the development stage of a heavy haze pollution event

The Science of The Total Environment, Год журнала: 2019, Номер 704, С. 135329 - 135329

Опубликована: Ноя. 22, 2019

Язык: Английский

---

A lightweight low-cost and multipollutant sensor package for aerial observations of air pollutants in atmospheric boundary layer

The Science of The Total Environment, Год журнала: 2020, Номер 764, С. 142828 - 142828

Опубликована: Окт. 7, 2020

Язык: Английский

---

To what extents do urbanization and air pollution affect fog?

Atmospheric chemistry and physics, Год журнала: 2020, Номер 20(9), С. 5559 - 5572

Опубликована: Май 12, 2020

Abstract. The remarkable development of China has resulted in rapid urbanization (urban heat island and dry island) severe air pollution (aerosol pollution). Previous studies demonstrate that these two factors have either suppressing or promoting effects on fog, but what are the extents their individual combined effects? In this study, a dense radiation fog event eastern January 2017 was reproduced by Weather Research Forecasting model coupled with Chemistry (WRF-Chem), aerosols (indicated liquid water content – LWC) quantitatively revealed. Results show inhibits low-level delays its formation advances dissipation due to higher temperatures lower saturations. contrast, upper-level could be enhanced because updraught-induced vapour convergence. Aerosols promote increasing LWC, droplet concentration decreasing effective radius. Further experiments current level still below critical aerosol suppresses fog. Urbanization influences larger extent than do. When combined, much weaker aerosol-promoting effect is counteracted stronger urbanization-suppressing Budget analysis LWC reveals urban (urbanization aerosols) alters profile structure mainly modulating condensation–evaporation process. Our results infer will further reduced if keeps developing quality deteriorating future.

Язык: Английский

---

Three‐Dimensional Distribution of PM_2.5 over the Yangtze River Delta as Cold Fronts Moving Through

Journal of Geophysical Research Atmospheres, Год журнала: 2021, Номер 126(8)

Опубликована: Март 19, 2021

Abstract Long‐range transport of PM 2.5 from the North China Plain (NCP) by cold frontal passage is considered to be an important haze formation mechanism in Yangtze River Delta (YRD). However, detailed 3D distributions and meteorological fields during front moving through are not fully understood. Herein, situ observations showed that most events autumn winter YRD were associated with passages. A typical episode on November 2–3, 2017, was investigated unmanned aerial vehicle sounding model simulations, which both revealed upper air (∼1.0 km) reached earlier than at ground level. When NCP, pollutants ahead lifted level air. Subsequently, increased concentrations higher wind speed resulted stronger outflow NCP compared The maximum mass contribution 15.6 μg m −3 (accounted for 31.5% total YRD), appeared ∼1.0 km altitude. Compared noncold period, transported 10–15 times episode. Results indicate combination multisite elaborate simulation can effectively explain impact synoptic processes transport, distribution, evolution pollution provide precise control directives.

Язык: Английский

---

Radiation fog properties in two consecutive events under polluted and clean conditions in the Yangtze River Delta, China: a simulation study

Atmospheric chemistry and physics, Год журнала: 2023, Номер 23(17), С. 9873 - 9890

Опубликована: Сен. 6, 2023

Abstract. Aerosol–cloud interaction (ACI) in fog and planetary boundary layer (PBL) conditions plays critical roles the life cycle. However, it is not clear how ACI first (Fog1) affects PBL subsequently second (Fog2), which important information for understanding between PBL, as well their effects on properties. To fill this knowledge gap, we simulate two successive radiation events Yangtze River Delta, China, using Weather Research Forecasting model coupled with Chemistry (WRF-Chem). Our simulations indicate that conducive to Fog2 formation are affected by high aerosol loading Fog1; subsequently, promotes Fog2, resulting a higher liquid water content, droplet number concentration, smaller size, larger optical depth, wider distribution, longer lifetime than Fog1. This phenomenon related following physical factors. The factor involves meteorological formation, including low temperature, humidity, stability. feedbacks microphysics radiative cooling. A concentration increases path thereby enhancing long-wave cooling condensation near top. third macrophysics, radiation, turbulence. top presents stronger base, weakens temperature inversion strengthens turbulence, ultimately increasing fog-top height area. In summary, under polluted conditions, postpones dissipation of Fog1 owing these generates more those prior These promote earlier further strengthening Fog2. findings studying aerosols, fog, PBL; moreover, they shed new light ACI.

Язык: Английский

---

Fog scavenging of particulate matters in air pollution events: Observation and simulation in the Yangtze River Delta, China

The Science of The Total Environment, Год журнала: 2023, Номер 876, С. 162728 - 162728

Опубликована: Март 13, 2023

Язык: Английский

---

Wintertime vertical distribution of black carbon and single scattering albedo in a semi-arid region derived from tethered balloon observations

The Science of The Total Environment, Год журнала: 2021, Номер 807, С. 150790 - 150790

Опубликована: Окт. 7, 2021

Язык: Английский

---

Vertical profile of aerosol number size distribution during a haze pollution episode in Hefei, China

The Science of The Total Environment, Год журнала: 2021, Номер 814, С. 152693 - 152693

Опубликована: Дек. 30, 2021

Язык: Английский

---

Seasonal and Diurnal Characteristics of the Vertical Profile of Aerosol Optical Properties in Urban Beijing, 2017–2021

Remote Sensing, Год журнала: 2023, Номер 15(2), С. 475 - 475

Опубликована: Янв. 13, 2023

Seasonal and diurnal characteristics of the vertical profiles aerosol properties are essential for detecting regional transport climatic radiative effects particles. We have studied seasonal distribution aerosols in urban Beijing from 2017 to 2021 based on long-term Raman–Mie LiDAR observations. The influence aerosols, meteorological conditions within boundary layer, optical–radiometric their interconnections, were investigated during a heavy haze pollution event 8 15 February 2020 using both sun photometer data. extinction coefficient was highest summer (0.4 km−1), followed by winter (0.35 roughly equal spring autumn (0.3 km−1). showed clear daily variations different seasons as result variation height layer. During event, particulate matter mainly consisted scattered spherical fine particles accumulation time pollutants measured via AOD440nm PM2.5 mass concentration hygroscopic growth This increased scattering led an increase optical depth. also contributed

Язык: Английский

---

Vertical Profiles of PM2.5 and O3 Measured Using an Unmanned Aerial Vehicle (UAV) and Their Relationships with Synoptic- and Local-Scale Air Movements

Remote Sensing, Год журнала: 2024, Номер 16(9), С. 1581 - 1581

Опубликована: Апрель 29, 2024

The vertical air pollutant concentrations and their relationships with synoptic- local-scale movement have been studied. This study measured the profiles of PM2.5 O3 using an unmanned aerial vehicle during summer in South Korea analyzed characteristics profiles. To understand impact synoptic movements, we generated categorized 48 h trajectories based on HYSPLIT, how varied under different categories long-range transport. We found that concentration has a positive gradient altitude when more polluted was transported from China or North negative cleaner East Sea. Unlike PM2.5, did not depend significantly transport scenario because short photochemical lifetime summer. For no significant local wind

Язык: Английский

---