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Radiative forcing and temperature response of dust aerosols over East Asia in the latest decade

Research in Cold and Arid Regions 2012年第4期4卷 351-356页

作者： XingTao Su HanJie Wang ZhiBiao Zhang Institute of Meteorology PLA University of Science and Technology Nanjing Jiangsu 211101 China Key Laboratory of Regional Climate-Environment Research for Temperate East Asia Chinese Academy of Science Beij'ing 100029 China Beijing Institute of Applied Meteorology Beijing 100029 China

A regional climate model, RegCM3, coupled with an online dust module, is used to simulate the radiative forcing （RF） and temperature response of dust aerosols over East Asia in the latest decade （2000-2009）. The simulation results show that the geographical and sea- sonal differences of dust aerosols dislribution over East Asia are obvious. There exist two exlremes of dust aerosols with column burden （CB） greater than 1,000 mg/m2; one is in the Taldimakan Desert ofthe Xinjiang Uigur Autonomous Region, China, and the other is in the Badain Jaran Desert of the Inner Mongolian Autonomous Region, Chin~ The maximum value of CB appears in spring, the sec- ondary maximum in winter, and the minimum in autumn. The RF of dust aerosols has distribution characteristics similar to CB. The regional averaged RF over East Asia at the top of atmosphere （TOARF） is - 1.72 W/m2 in spring and- 1.17 W/m2 in autumn, and that at the surface （SURRF） is -4.34 W/m2 in spring and -2.33 W/m2 in autumn. The temperature at the stwface is decreased by dust aero- sois; the regional averaged temperature decrease over East Asia is 0.154 ℃ in spring and 0.085 ℃ in autumn. There are different im- pacts of dust aerosols on air temperature at different heights. The air temperature is decreased by dust aerosols in the lower troposphere, but the extent of the decrease diminishes with increasing height. The air temperature is in fact increased by dust aerosols at the height of 300-400 hPa in spring, which is greatly different from that in autumn.

关键词： dust aerosols column burden radiative forcing temperature

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Enrichment and transfer of polycyclic aromatic hydrocarbons (PAHs) through dust aerosol generation from soil to the air

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Frontiers of Environmental Science & Engineering 2023年第1期17卷 111-120页

作者： Qianqian Gao Xiaojing Zhu Qihuang Wang Kaili Zhou Xiaohui Lu Zimeng Wang Xiaofei Wang Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention Department of Environmental Science and EngineeringFudan UniversityShanghai 200433China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China

Polycyclic aromatic hydrocarbons(PAHs)are major organic pollutants in *** is known that they are released to the atmosphere by wind via dust aerosol ***,it remains unclear how these pollutants are transferred through the air/soil *** this study,dust aerosols were generated in the laboratory using soils(sandy loam and loam)with various physicochemical *** PAH concentrations of these soils and their generated dust aerosol were measured,showing that the enrichment factors(EFs)of PAHs were affected by soil texture,PAH contamination level,molecular weight of PAH species and aerosol *** PAHs with higher EFs(6.24–123.35 in dust PM_(2.5);7.02–47.65 in dust PM_(10))usually had high molecular weights with more than four aromatic *** addition,the positive correlation between EFs of PAHs and the total OCaerosol content of dust aerosol in different particle sizes was also statistically significant(r=0.440,P<0.05).This work provides insights into the relationship between atmospheric PAHs and the contaminated soils and the transfer process of PAHs through the soil-air interface.

关键词： dust aerosols Enrichment factors(EFs) Polycyclic aromatic hydrocarbons(PAHs)

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Variation of dust in Northern China and Its Reproduction in BCC-ESM1 since 1980

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Journal of Meteorological Research 2023年第5期37卷 617-631页

作者： Yumeng ZHOU Tongwen WU Jie ZHANG Yong ZHANG Yanwu ZHANG He ZHAO Weihua JIE Yang ZHOU Kalli FURTADO Chinese Academy of Meteorological Sciences China Meteorological AdministrationBeijing 100081China Earth System Modeling and Prediction Centre China Meteorological AdministrationBeijing 100081China Sichuan Climate Center/Heavy Rain and Drought-Flood Disasters in Plateau and Basin Key Laboratory of Sichuan Province Chengdu 610072China State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesChina Meteorological AdministrationBeijing 100081China Meteorological Observation Centre China Meteorological AdministrationBeijing 100081China Nanjing University of Information Science&Technology Nanjing 210044China Met Office Hadley Centre Exeter EX13PBUnited Kingdom

In this paper,we explore the possible causes and mechanisms for the variation of dust in northern China from 1980to 2014 using the Modern-Era Retrospective analysis for Research and Applications version 2(MERRA-2)data,observational data,and BCC-ESM1(Beijing Climate Center Earth System Model version 1)simulation *** important dust centers are identified in China:one in the Taklamakan Desert in southern Xinjiang Region and the other in the Badain Jaran Desert in western Inner Mongolia *** centers display distinct seasonal variations,with high dust concentration in spring and summer and low in autumn and ***-ESM1 is able to generally capture the main spatial and temporal characteristics of dust in northern *** the MERRA-2 reanalysis data and BCCESM1 simulation data show a decreasing trend in spring dust,which is evident during 1980–2000 and 2001–*** analysis based on daily mean dust loads and wind fields from MERRA-2 and BCC-ESM1 indicates that dusty weather in North China may be mainly caused by transport of the dust,especially that from the central and western Inner Mongolia Plateau during the prior 0–2 days,through the westerly winds from the upstream“dust core”region(38°–45°N,90°–105°E).This is one of the important paths for dust to move into North *** weakened westerly wind in the lower troposphere in this“dust core”region may be responsible for the reduction of spring dust in North China.

关键词： dust aerosols Coupled Model Intercomparison Project Phase 6(CMIP6) earth system models

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Vertical Profile Comparison of Aerosol and Cloud Optical Properties in Dominated dust and Smoke Regions over Africa Based on Space-Based Lidar

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Atmospheric and Climate Sciences 2022年第3期12卷 588-602页

作者： Didier Ntwali Getachew Dubache Faustin Katchele Ogou Rwanda Space Agency (RSA) Earth and Space Science Division Kigali Rwanda College of Reading Academy Nanjing University of Information Science and Technology Nanjing China Laboratory of Atmospheric Physics Department of Physics University of Abomey-Calavi Abomey-Calavi Benin

This study evaluates the vertical profiles of aerosol and cloud optical properties in 40 dominated dust and smoke regions in Western-Northern Africa (WNA) and Central-Southern Africa (CSA), respectively, from the surface to 10km and from 2008 to 2011 based on LIVAS (LIdar climatology of Vertical Aerosol Structure for space-based lidar simulation studies). Aerosol extinction (AE), aerosol backscatter (AB), and aerosol depolarization (AD) generally increase from the surface to 1.2 km and decrease from 1.2 km to the upper layers in both WNA and CSA. AE and AB in CSA (maximum of 0.13 km-1, 0.14 km-1, 0.0021 km-1‧sr-1, 0.0033 km-1‧sr-1) are higher than in WNA (maximum of 0.07 km-1, 0.08 km-1, 0.0017 km-1‧sr-1, 0.0015 km-1‧sr-1) at 532 and 1064 nm respectively. AD in WNA (maximum of 0.25) is significantly higher than in CSA (maximum of 0.05). There is a smooth change with the height of cloud extinction and backscatter in WNA and CSA, while there is a remarkable increase of cloud depolarization with height, whereby it is high in CSA and low in WNA due to high and low fraction of cirrus respectively. Altocumulus has the highest extinction in NA (0.0139 km-1), CA (0.058 km-1), WA (0.013 km-1), while low overcast transparent (0.76 km-1) below 1 km in SA. The major findings of this study may contribute to the improvement of our understanding of aerosol-cloud interaction studies in dominated dust and smoke aerosol regions.

关键词： Vertical Profile dust aerosols Smoke aerosols Clouds Africa Lidar Climatology of Vertical Aerosol Structure for Space-Based Lidar Simulation Studies (LIVAS)

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