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| 1 | Ground-based observation of aerosol optical properties in Lanzhou, China显示文摘Aerosol optical properties from August 2006 to July 2007 were obtained from ground-based and sky radiance measurements in Semi- Arid Climate and Environment Observatory of Lanzhou University (SACOL), China. High aerosol optical thickness (AOT) associated with low ngstrm exponent (α) was mainly observed in spring, which was consistent with the seasonal dust production from Hexi Corridor. The maximum monthly average value of AOT 0.56 occurred in March of 2007, which was two times larger than the minimum value of 0.28 in October of 2006. Approximately 60% of the AOT ranged between 0.3 and 0.5, and nearly 93% of α value varied from 0.1 to 0.8, which occurred in spring. The significant correlation between aerosol properties and water vapor content was not observed. The aerosol volume size distribution can be characterized by the bimodal logarithm normal structure: fine mode (r < 0.6 μm) and coarse mode (r > 0.6 μm). Aerosols in spring of SACOL were dominated by large particles with the volume concentration ratio of coarse to fine modes being 7.85. The average values of asymmetry factor (g) in the wavelength range 440-1020 nm were found to be 0.71, 0.67, 0.67 and 0.69 in spring, summer, autumn and winter, respectively. | YU Xingna ZHU Bin FAN Shuxian YIN Yan BU Xiaoli | 2009 | Journal of Environmental Sciences2009，21，11： | 7 |
| 2 | Environmental changes during the past 13500 cal. a BP deduced from lacustrine sediment records of Lake Qinghai, China显示文摘A 475-cm long sediment core (QH-2005) from Lake Qinghai was used to carry out multi-proxy analysis of δ18O and body length of ostracod valves and redness and grain size of sediments, in order to reconstruct environ-mental changes during the past 13500 cal. a BP. The age model was based on 6 14C dates for bulk orgnic carbon (BOC) and 2 14C dates for lignin. The lignin 14C dates are apparently younger than the corresponding layers' BOC 14C dates, indicating that the reservoir age varied from 728 to 1222 a since the Late Glacial and from 2390 to 2490 a immediately before the pre-bomb era. Hence, the 14C age model for Core QH-2005 was corrected by the changing reservoir age. Ostracod δ18O values were primarily related to dilution and evaporative enrichment of the lake water. The reconstructed salinity based on ostracod body length coincides well with ostracod δ18O values. High redness and mean grain size (MZ) values indicate increased riverine supply to Lake Qinghai associated with increasing monsoon rainfall. Multi-proxy results show that climate during 13500-10900 cal. a BP was relatively cold and dry with fre-quent short-term fluctuations; a warm and wet climate began at about 10900 cal. a BP and culminated around 6500 cal. a BP as a result of monsoon strengthening; the climate became cold and dry afterwards and has remained rela-tively stable since 3400 cal. a BP. Our data also reveal short-term (millennial/centennial timescales) climatic fluctua-tions including: Younger Dryas events, ice-rafting events 8 and 1 (by ~11000 cal. a BP and ~1600 cal. a BP respec-tively), 8200 cal. a BP cold event, Little Ice Age and the Medieval Warm Period. | WANG Yong SHEN Ji XU Xingna LIU Xingqi SIROCKO Frank ZHANG Enlou JI Junfeng | 2011 | Chinese Journal Of Geochemistry2011，30，4： | 6 |
| 3 | 2017年合肥市农业源氨排放清单显示文摘大气氨是形成细颗粒物和过量氮沉降的主要前体物,准确编制氨的排放清单对于氨减排策略的制定具有至关重要的指导意义。本研究利用本地化的排放因子,建立了合肥市2017年高空间分辨率(1公里)的农业源氨排放清单。结果表明,合肥市2017年农业源氨排放总量为27242.7 t,畜禽源占氨排放总量的54.5%,其中肉鸡和蛋鸡是畜禽养殖源中最主要的氨排放源。空间分布上,合肥市平均的氨排放强度为2.4 t km-2,高值主要出现在人口密度较大的区域,其中长丰县和肥西县是合肥市农业源氨排放量和排放强度最大的两个城市。时间变化上,合肥市7月份氨排放量最高。本研究掌握了合肥市农业源氨排放量及其时空变化特征,有助于为合肥市大气污染防治提供有效的科学支撑。 | HOU Xinhong YU Xingna | 2020 | Atmospheric and Oceanic Science Letters2020，13，3： | 2 |
| 4 | A comparative analysis of aerosol properties in dust and haze-fog days in a Chinese urban region显示文摘 | Xingna Yu Bin Zhu Yan Yin Jun Yang Yanwei Li Xiaoli Bu | 2010 | Atmospheric Research2010，，2： | 1 |
| 5 | A comparative analysis of aerosol properties in dust and haze-fog days in a Chinese urban region显示文摘 | Xingna Yu Bin Zhu Yan Yin Jun Yang Yanwei Li Xiaoli Bu | 2010 | Atmospheric Research2010，，2： | 1 |
| 6 | A comparison of dust properties between China continent and Korea,Japan in East Asia显示文摘 | Yu Xingna Cheng Tiantao Chen Jianmin | 2006 | Atmospheric Environment2006，40，30： | 1 |
| 7 | Seasonal variability of aerosol optical properties over Beijing显示文摘 | Yu Xingna Zhu Bin Zhang Meigen | 2009 | Atmos Environ2009，43，： | 1 |
| 8 | Photoluminescence from nanocrystallities embedded in hydrogenated amorphous silicon films prepared by plasma enhanced chemical vapor deposition显示文摘 | Liu Xingna Wu Xiaowei Bao Ximao | 1994 | Appl Phys Lett1994，64，： | 1 |
| 9 | Laboratory simulation of SO_2 heterogeneous reactions on hematite surface under different SO_2 concentrations显示文摘The variations of sulfate formation and optical coefficients during SO2 heterogeneous reactions on hematite surface under different SO2 concentrations were examined using in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and ion chromatograph (IC). Laboratory experiments revealed that within ambient SO2 of 0.51–18.6 ppmv, sulfate product, producing velocity, absorption and backward scattering coefficients showed an increasing trend with SO2 concentration. Under given SO2 concentration, the velocity of sulfate producing performed an evolution of initial increasing, midterm decreasing and final stabilizing. The reactive uptake and Brunauer-Emmett-Teller (BET) uptake coefficients of heterogeneous reactions rose with SO2 and exhibited high reactivities. Considering global warming, this result is important for the knowledge of heterogeneous reactions of SO2 on mineral particle surface in the atmosphere and the assessment of their impacts on radiative forcing. | CUI Huxiong CHENG Tiantao YU Xingna CHEN Jianmin XU Yongfu FANG Wen | 2009 | Journal of Environmental Sciences2009，21，8： | 1 |
| 10 | A comparison of dust properties between China continent and Korea,Japan in East Asia显示文摘 | YU Xingna CHENG Tiantao CHEN Jianmin | 2006 | Atmospheric Environment2006，40，： | 1 |
| 11 | Aerosol optical properties and the mixing state of black carbon at a background mountainous site in Eastern China显示文摘In-situ measurements of aerosol optical properties were conducted at Mt. Huang from September 23 to October 28, 2012. Low averages of 82.2, 10.9, and 14.1 Mm-1 for scattering coefficient(σsp, neph, 550), hemispheric backscattering coefficient(σhbsp, neph, 550), and absorption coefficient(σap, 550), respectively, were obtained. Atmospheric aging process resulted in the increase of σap, 550 but the decrease of the single scattering albedo(ω550) at constant aerosol concentration. However, the proportion of non-light-absorbing components(non-BCs) was getting higher during the aging process, resulting in the increase of aerosol diameter, which also contributed to relatively higher σsp, neph, 550 and ω550. Diurnal cycles of σsp, neph, 550 and σap, 550 with high values in the morning and low values in the afternoon were observed closely related to the development of the planetary boundary layer and the mountain-valley breeze. BC mixing state, represented by the volume fraction of externally mixed BC to total BC(r), was retrieved by using the modified Mie model.The results showed r reduced from about 70% to 50% when the externally mixed non-BCs were considered. The periodical change and different diurnal patterns of r were due to the atmospheric aging and different air sources under different synoptic systems. Local biomass burning emissions were also one of the influencing factors on r. Aerosol radiative forcing for different mixing state were evaluated by a 'two-layer-single-wavelength' model,showing the cooling effect of aerosols weakened with BC mixing state changing from external to core-shell mixture. | Liang Yuan Yan Yin Hui Xiao Jian Hao Kui Chen Xingna Yu Xiaoling Zhang | 2019 | Journal of Environmental Sciences2019，31，9： | 1 |
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