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Deriving Temporal and Vertical Distributions of Methane in Xianghe Using Ground-based Fourier Transform Infrared and Gas-analyzer Measurements

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Advances in Atmospheric Sciences 2020年第6期37卷 597-607页

作者： Denghui JI Minqiang ZHOU Pucai wang Yang YANG Ting wang Xiaoyu SUN Christian HERMANS Bo YAO gengchen wang Key Laboratory of Middle Atmosphere and Global Environment Observation Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Royal Belgian Institute for Space Aeronomy Brussels 1180Belgium University of Chinese Academy of Sciences Beijing 100049China Meteorological Observation Center China Meteorological AdministrationBeijing 100081China

Methane(CH4)is one of the most important greenhouse gases in the atmosphere,making it worthwhile to study its temporal and vertical distributions in source areas,e.g.,North *** this purpose,a ground-based high-resolution Fourier transform infrared spectrometer(FTIR),the Bruker IFS 125 HR,along with an in-situ instrument,the Picarro G2301,were deployed in Xianghe County(39.8°N,117.0°E),Hebei Province,*** have been recorded since *** the FTIR measurements,we used two observation modes to retrieve the mole fraction of CH4:the Total Carbon Column Observing Network(TCCON)method(retrieval algorithm:GGG2014),and the Network for the Detection of Atmospheric Composition Change(NDACC)method(retrieval algorithm:SFIT4).Combining FTIR with in-situ measurements,we found the temporal and vertical distributions of atmospheric CH4 within three vertical layers(near the ground,in the troposphere,and in the stratosphere),and throughout the whole *** the diurnal variation of CH4 near the ground,the concentration at night was higher than during the *** the seasonal variation,CH4 was low in spring and high in summer,for all three vertical *** addition,there was a peak of CH4 in winter near the ground,both in the troposphere and the whole *** found that variation of CH4 in the tropospheric column was close to that of the in-situ measurements near the ***,the variations of CH4 in the stratospheric column could be influenced by vertical motions,since it was higher in summer and lower in winter.

关键词： winter Vertical column

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A kinetic study of the reaction of ozone with ethylene in a smog chamber under atmospheric conditions

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Chinese Science Bulletin 2006年第23期51卷 2839-2843页

作者： XU Yongfu JIA Long GE Maofa DU Lin wang gengchen wang Dianxun State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Research Center for Atmospheric Environment Beijing Normal University Beijing 100875 China Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China Division for Middle Atmosphere and Remote Sensing Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

Ozone is one of the key species in the processes of atmospheric chemistry, which can be taken as an indicator of oxidation capacity in the troposphere. The reaction of ozone with reactive gases is an important process in the troposphere. Experimental simulation equipment of smog chamber for atmospheric reactions is used to study the reaction of ozone with ethylene in real atmospheric environment with ozone concentrations of 100―200 ppb. The concentrations of ozone and ethylene were moni-tored during the reaction with the combination of Model 49C-O_3 Analyzer and GC-FID. A rate constant of 1.01×10^(-18) (cm^3·mol^(-1)·s-(~1)) was obtained at 286.5 K, under condition of which the half-life of ozone was 88 min. The results obtained from our experiments are in excellent agreement with those reported previously by other researchers under extremely low pressure in terms of matrixisolation technology. This demonstrates that our equipment of smog chamber for atmospheric reactions is reliable, which can be used for further research of the processes of atmospheric reactions.

关键词：臭氧乙烯反作用力动力学比率常量气相反应

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Ozone mini-hole occurring over the Tibetan Plateau in December 2003

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Chinese Science Bulletin 2006年第7期51卷 885-888页

作者： BIAN Jianchun wang gengchen CHEN Hongbin QI Donglin LUE Daren ZHOU Xiuji LAGEO Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China Qinghai Meteorological Bureau Xining 810001 China Chinese Academy of Meteorological Sciences Beijing 100081 China

By analyzing the total ozone data from TOMS and ground-based observations, it is found that a large area with extremely low ozone occurred over the Tibetan Plateau during December 14-17, 2003. After correcting the bias in TOMS data, the area with the total ozone < 220 DU is found to be over 2500000 km2, and the minimum value is only 190 DU. It is the first time that an ozone mini-hole or an extremely low ozone event is found to occur over the Tibetan Plateau.

关键词：西藏高原臭氧环境保护 TOMS数据地面观察

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A method for calculating the total ozone amount in the clear skies

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Journal of Environmental Sciences 1996年第3期8卷 308-312页

作者： Bai Jianhui wang gengchen(Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China) Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

A new method for calculating the clear day total ozone amount was obtained by the regression analysis of the observation data of ozone,solar UV radiation, and meteorological *** this method the monthly mean total ozone amounts for the year 1991 in Beijing were calculated. Generally, the calculated values agree well with the Dobson spectrophotometer measurements, the average relative deviation between them being less than 2. 2%. According to the F-test,the photochemical reactions in the atmosphere,the solar UV radiation,and the aerosols are three most important factors to affect the column total ozone amount.

关键词： total ozone amount solar UV radiation photochemical reaction.

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Physical and mechanical properties and microstructures of submarine soils in the Yellow Sea

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Deep Underground Science and Engineering 2024年第2期3卷 197-206页

作者： Zhuangcai Tian Yihua Chang Sichao Chen gengchen wang Yanhong Hu Chuan Guo Lei Jia Lei Song Jianhua Yue State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhouChina School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhouChina Research Center for Deep Ocean Science and Underwater Engineering China University of Mining and TechnologyXuzhouChina School of Resources and Geosciences China University of Mining and TechnologyXuzhouChina

In recent years,the exploration of seabed has been intensified,but the submarine soils of silt and sand in the Yellow Sea area have not been well investigated so *** this study,the physical and mechanical properties of silt and sand from the Yellow Sea were measured using a direct shear apparatus and their microstructures were observed using a scanning electron *** test results suggest that the shear strength of silt and sand increases linearly with the increase of normal *** on the direct shear test,the scanning electron microscope was used to observe the section surface of *** is observed that the section surface becomes rough,with many“V”‐shaped *** particles appear on the surface of the silt structure and tend to be *** X‐ray diffraction experiment reveals that the sand and silt have different *** shear strength of sand is slightly greater than that of silt under high stress,which is related to the shape of soil particles and the mineral *** results can be a reference for further study of other soils in the Yellow Sea;meanwhile,they can serve as soil parameters for the stability and durability analyses of offshore infrastructure construction.

关键词： direct shear test microscope physical properties submarine soil Yellow Sea

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CO_2 background concentration in the atmosphere over the Chinese mainland

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Chinese Science Bulletin 2002年第14期47卷 1217-1220页

作者： wang gengchen, WEN Yupu, KONG Qinxin, REN Lixin & wang MulinInstitute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China Academy of Meteorological Sciences, China Meteorological Administration, Beijing 100086, China Institute of Atmospheric Physics Chinese Academy of Sciences Beijing China Academy of Meteorological Sciences China Meteorological Administration Beijing China

Based on the long-term monitoring data on CO2 concentration, variation trend and characteristics of CO2 background concentration in the atmosphere over the Chinese mainland are analyzed. Results show that the increasing trend of CO2 background concentration in the atmosphere over the Chinese mainland has appeared during the period of 1991-2000. The average annual CO2 growth increment is 1.59μL/L, and the average annual CO2 growth rate is 0.44%. Distinct seasonal variations of CO2 background concentration are observed, and the averaged amplitude of CO2 seasonal variations is 10.35μL/L. Regional variation characteristics of CO2 background concentration in the atmosphere and possible impact of human activities on these variations over the Chinese mainland are discussed as well.

关键词： CO2 background concentration Chinese mainland CO2 growth rate CO2 seasonal variation CO2 regional variation CO2 variation trend.

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北京地区太阳紫外辐射的长期变化趋势及分析

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太阳能学报 2000年第2期21卷 192-197页

作者：白建辉王庚辰浙江大学电机系杭州310027

对实际天气条件下北京地区 1 990年 1月至 1 992年 8月太阳辐射观测资料进行了详细分析 ,得到实际天气条件下到达地面的太阳紫外辐射的计算公式。结果表明 ,计算值与观测值吻合得比较好。利用该式计算了北京地区 1 979年 1月— 1 996年 ... 详细信息

对实际天气条件下北京地区 1 990年 1月至 1 992年 8月太阳辐射观测资料进行了详细分析 ,得到实际天气条件下到达地面的太阳紫外辐射的计算公式。结果表明 ,计算值与观测值吻合得比较好。利用该式计算了北京地区 1 979年 1月— 1 996年 6月的太阳紫外辐射 ,讨论了 1 979— 1 996年北京地区太阳紫外辐射的变化趋势及不同因子 (臭氧、水汽、气溶胶等 )对太阳紫外辐射的影响。

关键词：太阳紫外辐射大气臭氧总量气溶胶太阳辐射

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Long-Term Trends of Carbon Monoxide Total Columnar Amount in Urban Areas and Background Regions:Ground-and Satellite-based Spectroscopic Measurements

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Advances in Atmospheric Sciences 2018年第7期35卷 785-795页

作者： Pucai wang N.F.ELANSKY Yu.M.TIMOFEEV gengchen wang G.S.GOLITSYN M.V.MAKAROVA V.S.RAKITIN Yu.SHTABKIN A.I.SKOROKHOD E.I.GRECHKO E.V.FOKEEVA A.N.SAFRONOV Liang RAN Ting wang LAGEO Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China A.M.Obukhov Institute of Atmospheric Physics Russian Academy of SciencesMoscow 119017Russia St.Petersburg State University Saint-Petersburg 198904Russia

A comparative study was carried out to explore carbon monoxide total columnar amount（CO TC） in background and polluted atmosphere, including the stations of ZSS（Zvenigorod）, ZOTTO（Central Siberia）, Peterhof, Beijing, and Moscow,during 1998–2014, on the basis of ground-and satellite-based spectroscopic measurements. Interannual variations of CO TC in different regions of Eurasia were obtained from ground-based spectroscopic observations, combined with satellite data from the sensors MOPITT（2001–14）, AIRS（2003–14）, and IASI Met Op-A（2010–13）. A decreasing trend in CO TC（1998–2014） was found at the urban site of Beijing, where CO TC decreased by 1.14% ± 0.87% yr^（-1）. Meanwhile, at the Moscow site, CO TC decreased remarkably by 3.73% ± 0.39% yr^（-1）. In the background regions（ZSS, ZOTTO, Peterhof）, the reduction was 0.9%–1.7% yr^（-1） during the same period. Based on the AIRSv6 satellite data for the period 2003–14, a slight decrease（0.4%–0.6% yr^（-1）） of CO TC was detected over the midlatitudes of Eurasia, while a reduction of 0.9%–1.2% yr^（-1） was found in Southeast Asia. The degree of correlation between the CO TC derived from satellite products（MOPITTv6 Joint, AIRSv6 and IASI Met Op-A） and ground-based measurements was calculated, revealing significant correlation in unpolluted *** in polluted areas, IASI Met Op-A and AIRSv6 data underestimated CO TC by a factor of 1.5–2.8. On average, the correlation coefficient between ground-and satellite-based data increased significantly for cases with PBL heights greater than 500 m.

关键词： carbon monoxide trend spectroscopic measurement MOPITT AIRS IASI

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机-机双基地雷达若干关键技术研究

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电光与控制 2009年第7期16卷 45-48页

作者：王喜王更辰空军工程大学工程学院西安710038

针对机载雷达在作战使用时面临的隐身目标和综合电子干扰,将双基地雷达运用于机载雷达,提出机-机双基地雷达系统。介绍了该雷达系统的基本组成和原理,结合双基地雷达和机载雷达各自的特点,在双机之间建立高速实时数据链来传输信号,解决... 详细信息

针对机载雷达在作战使用时面临的隐身目标和综合电子干扰,将双基地雷达运用于机载雷达,提出机-机双基地雷达系统。介绍了该雷达系统的基本组成和原理,结合双基地雷达和机载雷达各自的特点,在双机之间建立高速实时数据链来传输信号,解决空中运动平台信号的传输;采用脉冲追赶法实现空间同步、采用高稳定的原子钟来维持时间同步、采用锁相环加独立频率源综合法实现频率和相位同步;运用合理的作战模式来提高双基地雷达的反隐身和抗干扰能力。最后指出其技术难点和未来的技术发展方向。

关键词：机载雷达抗干扰同步技术隐身目标机-机双基地雷达

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雷达模拟器在PD雷达抗干扰研究中的应用

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微计算机信息 2007年第23期23卷 311-312页

作者：张甜笑王更辰空军工程大学工程学院西安710038

分析了某型机载脉冲多普勒雷达受扰后无法截获和跟踪目标的情况,然后对应用雷达回波信号模拟器解决该型机载脉冲多普勒雷达受扰问题进行了论证分析,并提出了相应的解决方案。该问题的解决将使雷达具有了跟踪杂波源的能力,应用前景广阔。

关键词：雷达模拟器杂波源角跟踪精确测距

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