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| 1 | Concentrations and chemical compositions of PM10 during hazy and non-hazy days in Beijing显示文摘In order to study the concentrations of major components,characteristics and comparison in hazy and non-hazy days of PM10 in Beijing,aerosol samples were collected at urban site in Beijing from December 29,2014 to January 22,2015.Heavy metals like Zn,Pb,Mn,Cu,As,V,Cr and Cd were deeply studied considering their toxic effects on human being;nine water-soluble inorganic ions(SO4^2-,NO3^-,NH4^+,Na^+,K^+,Cl^-,Ca^2+and Mg^2+)and carbon fractions(OC and EC)were also analyzed.The concentrations of heavy metals were 1.03–1.98 times higher in hazy days than those in non-hazy days,mainly due to biomass burning and coal burning.The trends in total heavy metals concentrations were basically consistent with the trends in PM concentrations except for two obvious periods(12.29–12.30;1.14–1.15);but when air masses accumulated locally or around Beijing,trends in PM concentrations and heavy metals were opposite.The proportion for NO3^-/SO4^2-indicated that mobile sources such as automobiles were important reasons for haze in Beijing.Correlation between OC and EC during non-hazy days was strong(R^2=0.95)but it was low(R^2=0.67)during hazy days,and large variations for OC/EC values occurred in hazy days.The calculated mass concentration of SOC is 2.58μg/m^3,which only accounted for 10.1%of the OC concentration.When air masses from the far north-west,they decreased PM concentration in Beijing and they were relatively clean;however,those from the near east,south-east and south of the mainland increased PM concentration and they were dirty. | Xianchu Wu Bin Chen Tianxue Wen Ammara Habib Guangyu Shi | 2020 | Journal of Environmental Sciences2020，32，1： | 5 |
| 2 | Estimation and inter-comparison of dust aerosols based on MODIS, MISR and AERONET retrievals over Asian desert regions显示文摘This study presents detailed analysis of spatiotemporal variations and trend of dust optical properties i.e., Aerosol Optical Depth(AOD) and Angstrom component over Asian desert regions using thirteen years of data(i.e., 2001–2013) retrieved from Aerosol Robotic Network(AERONET), Moderate Resolution Imaging Spectroradiometer(MODIS) and Multi-angle Imaging Spectroradiometer(MISR). These regions include Solar Village, Dunhuang and Dalangzadgad and are considered as origin of desert aerosols in Asia. Mann–Kendall trend test was used to show the trend of AOD. The relationship of AOD with weather parameters and general AOD trend over different wavelengths has also been shown. AOD's trend has been observed significant throughout the year in Solar Village, while in Dunhuang and Dalanzadgad the significant trend has been found only in peak period(March–June).Analysis show high values of AOD and low values of angstrom in Solar Village during peak period. In Chinese desert regions, high values of AOD have been found during peak period and low values in pre-peak period. Significant relationship has been observed between AOD and average temperature in Solar Village and Dalanzadgad whereas rainfall and wind speed showed no significant impact on AOD in all desert regions. | Ammara Habib Bin Chen Bushra Khalid Saichun Tan Huizheng Che Tariq Mahmood Guangyu Shi Muhammad Tahir Butt | 2019 | Journal of Environmental Sciences2019，31，2： | 5 |
| 3 | 北京和伊斯兰堡冬季PM10中物质浓度和化学组分的对比显示文摘为了研究对比北京、伊斯兰堡冬季PM10中重金属、水溶性无机离子以及碳组分的污染特征,于2014年12月-2015年1月分别在两地每天采集1次PM10样品,对大气颗粒物中以上3种物质的质量浓度进行了分析。结果表明,两地PM10中重金属污染情况较为严重,北京地区的As、Cr(VI)以及伊斯兰堡的Cd、Cr(VI)均超过WHO标准。根据主成分分析,北京重金属主要排放源为燃煤和移动源,而伊斯兰堡主要为移动源。两地颗粒物中水溶性无机离子二次污染情况较为严重,在霾天浓度也同样会上升,虽然污染程度不同,但造成霾天污染的一个重要原因均为机动车等移动源。对于碳组分,北京OC、EC线性关系较好(特别是在非霾天),说明其来源比较相似和简单,在排放后被类似的过程所控制,主要为煤炭燃烧和汽车排放;而伊斯兰堡OC、EC线性关系较差,在非霾天甚至出现负相关,说明其来源差别较大,主要为汽车排放。北京地区在研究期间SOC的质量浓度为2.58μg/m3,仅占OC质量浓度的10.1%,而伊斯兰堡基本没有SOC的生成。 | 吴宪初 陈彬 温天雪 SHAHID Imran HABIB Ammara 石广玉 | 2019 | 山东大学学报(理学版)2019，54，7： | 1 |
| 4 | A case study of cold-seasonthundersnow in Beijing显示文摘本文详细分析了2009年11月北京地区一次带有雷电现象的冬季雪暴发生原因和天气系统的中尺度结构。对常规天气资料、卫星资料和北京地区稠密中尺度探测资料如多普勒天气雷达,风廓仪,微博辐射计以及自动气象站等资料进行了详细分析,结合天气学理论,揭示了冬季雪暴系统的中尺度流场结构、演变情况以及对流不稳定能量的来源,发现对流触发机制为中层短波扰动,雪暴是发生于冬季华北地区迴流天气系统低层逆温之上的高架对流。华北地区冬季发生对流的大尺度天气背景是异常的大气环流下南方水汽输送带一直延伸至华北地区,在冷空气锲上爬升造成位势不稳定所导致。 | JIAO Reguang CHEN Bin HABIB Ammara SHI Guangyu | 2019 | Atmospheric and Oceanic Science Letters2019，12，6： | 1 |
| 5 | Observational Characteristics of Cloud Radiative Effects over Three Arid Regions in the Northern Hemisphere显示文摘Cloud–radiation processes play an important role in regional energy budgets and surface temperature changes over arid regions. Cloud radiative effects(CREs) are used to quantitatively measure the aforementioned climatic role. This study investigates the characteristics of CREs and their temporal variations over three arid regions in central Asia(CA), East Asia(EA), and North America(NA), based on recent satellite datasets. Our results show that the annual mean shortwave(SW) and net CREs(SWCRE and NCRE) over the three arid regions are weaker than those in the same latitudinal zone of the Northern Hemisphere. In most cold months(November–March), the longwave(LW)CRE is stronger than the SWCRE over the three arid regions, leading to a positive NCRE and radiative warming in the regional atmosphere–land surface system. The cold-season mean NCRE at the top of the atmosphere(TOA) averaged over EA is 4.1 W m^(-2), with a positive NCRE from November to March, and the intensity and duration of the positive NCRE is larger than that over CA and NA. The CREs over the arid regions of EA exhibit remarkable annual cycles due to the influence of the monsoon in the south. The TOA LWCRE over arid regions is closely related to the high-cloud fraction, and the SWCRE relates well to the total cloud fraction. In addition, the relationship between the SWCRE and the low-cloud fraction is good over NA because of the considerable occurrence of low cloud. Further results show that the interannual variation of TOA CREs is small over the arid regions of CA and EA, but their surface LWCREs show certain decreasing trends that correspond well to their decreasing total cloud fraction. It is suggested that combined studies of more observational cloud properties and meteorological elements are needed for indepth understanding of cloud–radiation processes over arid regions of the Northern Hemisphere. | Jiandong LI Tianhe WANG Ammara HABIB | 2017 | Journal of Meteorological Research2017，31，4： | 1 |
| 6 | Estimation of aerosol optical depth in relation to meteorological parameters over eastern and western routes of China Pakistan economic corridor显示文摘This study finds out seasonal and monthly variations in Aerosol Optical Depth(AOD)over eastern and western routes of China Pakistan Economic Corridor(CPEC)and the relationship between AOD and meteorological parameters(i.e.,temperature,rainfall and wind speed).The Moderate Resolution Imaging Spectroradiometer(MODIS)and Multi-angle Imaging Spectroradiometer(MISR)data was used from the terra satellite for the period of 2000-2016.This study aims to overtake the conventional view of the purpose of using the satellite datasets.This study takes on to the concept that validated satellite data sets rather should be used for the analysis instead of just validation specifically for our study region.Hence,after comparing MODIS AOD with MISR AOD,only MISR AOD dataset is used for further analysis.The results show a decreasing trend of AOD in summer season,a positive relationship between temperature and AOD during winter and spring seasons whereas a positive relationship between wind speed and AOD in winter and spring seasons over eastern and western routes.Periodic analysis of MODIS AOD and MISR AOD depicts May-Aug as the peak period of aerosol concentration over central Pakistan.The inter-annual analysis shows the aerosol trend remained higher during summer season however rainfall shows the washout effect.Eastern route has higher standard deviation and larger values for aerosol prevalence as compared to western route.The trajectory analysis using the HYSPLIT model suggests the bias of air mass trajectory caused deviation in the aerosol trend in the year 2014. | Bushra Khalid Ayesha Khalid Sidra Muslim Ammara Habib Kishwar Khan Debora Souza Alvim Sehrish Shakoor Sonia Mustafa Sana Zaheer Momel Zoon Azmat Hayat Khan Sana Ilyas Bin Chen | 2021 | Journal of Environmental Sciences2021，33，1： | 1 |
| 7 | 基于静稳天气下气球探空实验的中国沙漠地区沙尘气溶胶的垂直分布(英文)显示文摘塔克拉玛干沙漠是亚洲沙尘气溶胶的重要源地。为探讨塔克拉玛干地区沙尘气溶胶的理化特性与时空变化,研究其环境与气候效应,本文分析了四个季节在中国敦煌(塔克拉玛干沙漠内)取得的探空气球观测数据,包括气溶胶的数浓度、粒径分布、质量浓度及在西风主导下的水平输送通量。气溶胶数浓度的垂直廓线显示,来自沙漠地区的矿物粒子对局地环境与气候有重要影响,且所有季节都存在长距离输送。粒子谱分布显示局地有大量粗粒子输入。结果说明,源于塔克拉玛干沙漠的沙尘气溶胶的背景输送有着重要的科学意义,需进一步研究其对东亚和西太平洋地区环境与气候的影响。 | HABIB Ammara CHEN Bin SHI Guangyu IWASAKA Yasunobu NATH Debashis KHALID Bushra TAN Saichun MAHMOOD Tariq JIAO Reguang NTWALI Didier | 2019 | Atmospheric and Oceanic Science Letters2019，12，1： | 0 |
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