Impact of various emission control schemes on air quality using WRF-Chem during APEC China 2014

Atmospheric Environment, Journal Year: 2016, Volume and Issue: 140, P. 311 - 319

Published: June 5, 2016

Language: Английский

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Performance of MODIS Collection 6.1 Level 3 aerosol products in spatial-temporal variations over land

Atmospheric Environment, Journal Year: 2019, Volume and Issue: 206, P. 30 - 44

Published: March 6, 2019

This study evaluates the long-term Terra and Aqua Moderate Resolution Imaging Spectroradiometer (MODIS) Collection 6.1 (C6.1) Level 3 atmospheric aerosol products over land. For this purpose, three monthly optical depth (AOD) datasets, including Dark Target (DT), Deep Blue (DB) combined DT DB (DTB) during 2003–2017, are collected. Aerosol Robotic Network (AERONET) Version 2 2.0 (cloud-screened quality-assured) measurements at 431 sites around world selected for comparison. attempts to provide a better understanding of different MODIS their applicability multiple spatial scales suitability representing trend characteristics. Experiments performed with direct comparisons between retrievals AERONET global, local site scales. Meanwhile, temporal variations also compared discussed. Our results illustrate that C6.1 AOD well correlated globally, while DTB product performs best most regions, yet is superior scale. In general, always overestimate more accurate in describing annual mean loadings trends, there small differences products. Among neither one can consistently outperform others both accurately capture correct changes strongly recommended selection related studies global

Language: Английский

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Analysis of the Influence of Precipitation and Wind on PM2.5 and PM10 in the Atmosphere

Advances in Meteorology, Journal Year: 2020, Volume and Issue: 2020, P. 1 - 13

Published: Aug. 3, 2020

In this paper, hourly observations of precipitation, wind, and PM2.5 PM10 concentrations in Qinhuangdao from 2016 to 2018 were used study the effects precipitation wind on concentrations. The results show that has a certain wet scavenging effect PM10, is greater than PM2.5. Precipitation above moderate rainfall concentrated May September, light rain winter increases concentration pollutants. changes before after are related initial intensity, duration. closely precipitation. higher is, removal amount will be. Moderate or pollution weather mainly occurs northeast, southwest, west meteorological conditions; more westerly pollution; north northwest have most obvious Pm10; when speed 2 m/s, can be reduced; 4 under south southeast east northeast wind.

Language: Английский

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The climate impact of aerosols on the lightning flash rate: is it detectable from long-term measurements?

Atmospheric chemistry and physics, Journal Year: 2018, Volume and Issue: 18(17), P. 12797 - 12816

Published: Sept. 6, 2018

Abstract. The effect of aerosols on lightning has been noted in many case studies, but much less is known about the long-term impact, relative importance dynamics–thermodynamics versus aerosol, and any difference by different types aerosols. Attempts are made to tackle all these factors, whose distinct roles discovered analyzing 11-year datasets lightning, aerosol loading composition, dynamic–thermodynamic data from satellite model reanalysis. Variations rate analyzed with respect changes variables indices such as convective available potential energy (CAPE) vertical wind shear. In general, strong diurnal seasonal variations, peaking afternoon during summer. flash higher moist central Africa than dry northern presumably because combined influences surface heating, CAPE, humidity (RH), type. both regions, optical depth (AOD) a boomerang shape: first increasing AOD, tailing off around AOD = 0.3, then behaving differently, i.e., decreasing for dust flattening smoke deviation arguably caused tangled thermodynamics (in particular CAPE) type between two regions. Africa, branches opposite trends seem echo dominant microphysical radiative that more pronounced under low high conditions, respectively. Under low-AOD likely invigorates deep convection. This may gradually yield suppression increases, leading smaller cloud droplets highly susceptible evaporation conditions Africa. For invigoration can be sustained across entire range CAPE. This, plus heating layer, jointly offsets convection due cooling at Various analyses were done tend support this hypothesis.

Language: Английский

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Planetary boundary layer height from CALIOP compared to radiosonde over China

Atmospheric chemistry and physics, Journal Year: 2016, Volume and Issue: 16(15), P. 9951 - 9963

Published: Aug. 8, 2016

Abstract. Accurate estimation of planetary boundary layer height (PBLH) is key to air quality prediction, weather forecast, and assessment regional climate change. The PBLH retrieval from the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) expected complement ground-based measurements due broad spatial coverage satellites. In this study, CALIOP PBLHs are derived combination Haar wavelet maximum variance techniques, further validated against estimated lidar at Beijing Jinhua. Correlation coefficients between ground- satellite-based lidars 0.59 0.65 Also, climatology radiosonde compiled over China during period 2011 2014. Maximum CALIOP-derived can be seen in summer as compared lower values other seasons. Three matchup scenarios proposed according position each site relative its closest CALIPSO ground tracks. For scenario, intercomparisons were performed CALIOP- radiosonde-derived PBLHs, scenario 2 found better than using difference criteria. early afternoon 70 % total sites have ranging 1.6 2.0 km. Overall, well consistent PBLHs. To our knowledge, study first intercomparison on a large scale network China, shedding important light data initial results.

Language: Английский

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