|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Meteorological applications of precipitable water vapor measurements retrieved by the national GNSS network of China显示文摘In this study, the Global Navigation Satellite System(GNSS) network of China is discussed,which can be used to monitor atmospheric precipitable water vapor(PWV). By the end of2013, the network had 952 GNSS sites, including 260 belonging to the Crustal Movement Observation Network of China(CMONOC) and 692 belonging to the China Meteorological Administration GNSS network(CMAGN). Additionally, GNSS observation collecting and data processing procedures are presented and PWV data quality control methods are investigated. PWV levels as determined by GNSS and radiosonde are compared. The results show that GNSS estimates are generally in good agreement with measurements of radiosondes and water vapor radiometers(WVR). The PWV retrieved by the national GNSS network is used in weather forecasting, assimilation of data into numerical weather prediction models, the validation of PWV estimates by radiosonde, and plum rain monitoring.The network is also used to monitor the total ionospheric electron content. | Liang Hong Cao Yunchang Wan Xiaomin Xu Zhifang Wang Haishen Hu Heng | 2015 | Geodesy and Geodynamics2015，6，2： | 6 |
| 2 | The Tibetan Plateau Surface–Atmosphere Coupling System and Its Weather and Climate Effects: The Third Tibetan Plateau Atmospheric Science Experiment显示文摘The Tibetan Plateau(TP) is a key area affecting forecasts of weather and climate in China and occurrences of extreme weather and climate events over the world. The China Meteorological Administration, the National Natural Science Foundation of China, and the Chinese Academy of Sciences jointly initiated the Third Tibetan Plateau Atmospheric Science Experiment(TIPEX-Ⅲ) in 2013, with an 8–10-yr implementation plan. Since its preliminary field measurements conducted in 2013, routine automatic sounding systems have been deployed at Shiquanhe, Gaize, and Shenzha stations in western TP, where no routine sounding observations were available previously. The observational networks for soil temperature and soil moisture in the central and western TP have also been established. Meanwhile, the plateau-scale and regional-scale boundary layer observations, cloud–precipitation microphysical observations with multiple radars and aircraft campaigns, and tropospheric–stratospheric air composition observations at multiple sites, were performed. The results so far show that the turbulent heat exchange coefficient and sensible heat flux are remarkably lower than the earlier estimations at grassland, meadow, and bare soil surfaces of the central and western TP. Climatologically, cumulus clouds over the main body of the TP might develop locally instead of originating from the cumulus clouds that propagate northward from South Asia. The TIPEX-Ⅲ observations up to now also reveal diurnal variations, macro-and microphysical characteristics, and water-phase transition mechanisms, of cumulus clouds at Naqu station. Moreover, TIPEX-Ⅲ related studies have proposed a maintenance mechanism responsible for the Asian 'atmospheric water tower' and demonstrated the effects of the TP heating anomalies on African, Asian, and North American climates. Additionally, numerical modeling studies show that the Γ distribution of raindrop size is more suitable for depicting the TP raindrop characteristics compared to the M–P distribution, the overestimation of sensible heat flux can be reduced via modifying the heat transfer parameterization over the TP, and considering climatic signals in some key areas of the TP can improve the skill for rainfall forecast in the central and eastern parts of China. Furthermore, the TIPEX-Ⅲ has been promoting the technology in processing surface observations, soundings, and radar observations, improving the quality of satellite retrieved soil moisture and atmospheric water vapor content products as well as high-resolution gauge–radar–satellite merged rainfall products, and facilitating the meteorological monitoring, forecasting, and data sharing operations. | Ping ZHAO Yueqing LI Xueliang GUO Xiangde XU Yimin LIU Shihao TANG Wenming XIAO Chunxiang SHI Yaoming MA Xing YU Huizhi LIU La JIA Yun CHEN Yanju LIU Jian LI Dabiao LUO Yunchang CAO Xiangdong ZHENG Junming CHEN An XIAO Fang YUAN Donghui CHEN Yang PANG Zhiqun HU Shengjun ZHANG Lixin DONG Juyang HU Shuai HAN Xiuji ZHOU | 2019 | Journal of Meteorological Research2019，33，3： | 4 |
| 3 | Tropospheric Wet Refractivity Tomography Based on the BeiDou Satellite System显示文摘This paper presents a novel approach for assessing the precision of the wet refractivity field using BDS(BeiDou navigation satellite system) simulations only, GPS, and BDS+GPS for the Shenzhen and Hongkong GNSS network. The simulations are carried out by adding artificial noise to a real observation dataset. Instead of using the δ and σ parameters computed from slant wet delay, as in previous studies, we employ the Bias and RMS parameters, computed from the tomography results of total voxels, in order to obtain a more direct and comprehensive evaluation of the precision of the refractivity field determination. The results show that:(1) the precision of tropospheric wet refractivity estimated using BDS alone(only 9 satellites used) is basically comparable to that of GPS;(2) BDS+GPS(as of current operation) may not be able to significantly improve the data's spatial density for the application of refractivity tomography; and(3) any slight increase in the precision of refractivity tomography, particularly in the lower atmosphere, bears great significance for any applications dependent on the Chinese operational meteorological service. | WANG Xiaoying WANG Xianliang DAI Ziqiang KE Fuyang CAO Yunchang WANG Feifei SONG Lianchun | 2014 | Advances in Atmospheric Sciences2014，31，2： | 3 |
| 4 | Effect of Twin Boundary–Dislocation–Solute Interaction on Detwinning in a Mg–3Al–1Zn Alloy显示文摘In the present study,the influence of solute atoms together with dislocations at {1012} twin boundary(TB) on mechanical behavior of a detwinning predominant deformation in a Mg alloy AZ31 plate was systematically studied.The results show that a large number of {1012} twins disappear during recompression along the normal direction.Both the TB–dislocation interaction and TB–solute–dislocation interaction can greatly enhance the yield stress of the recompression along the normal direction(ND).However,the solute segregation at {1012} TBs with an intensive interaction with dislocations cannot further enhance the yield stress of ND recompression.The samples with TB–dislocation interaction show a similar working hardening performance with that subjected to a TB–solute–dislocation interaction.Both the TB–dislocation interaction and TB–solute–dislocation interaction greatly reduce the value of work hardening peaks during a detwinning predominant deformation. | Jing Xu Bo Guan Huihui Yu Xuezhen Cao Yunchang Xin Qing Liu | 2016 | Journal of Materials Science & Technology2016，32，12： | 1 |
| 5 | Impact of the weighted mean temperature on the estimation of GPS precipitable water vapor显示文摘 | Yunchang Cao Feifei Zheng | | 0，，2： | 1 |
| 6 | Chinese weighted mean temperature analysis based on soundings data and ECMWF reanalysis product in ground-based GPS 显示文摘 | Wang Xiaoying Song Lianchun Cao Yunchang | 2012 | Acta Meteor Sinica2012，26，5： | 1 |
| 7 | Tailoring the microstructure and mechanical properties of the final Al-Mn foils by different intermediate annealing process显示文摘In this work, two different intermediate annealing processes, single-step annealing(SSA, 530?C/15 h)and two-step annealing(TSA, 450?C/5 h + 530?C/15 h), were used to tailor microstructure before coldrolling and annealing of the final twin-roll cast Al-Mn foils. The recrystallization behavior and mechanical properties during annealing of severely cold-rolled foils were systematically studied. Our results show that discontinuous recrystallization occurs in SSA-foils during annealing at 150–310?C, in contrast with continuous recrystallization in TSA-foils. The continuous recrystallization develops much finer grains(~1.35 μm) in the TSA-foils than those by discontinuous recrystallization in the SSA-foils(~14.7 μm). The texture components in cold-rolled TSA-foils hardly change(retained rolling-textures) after continuous recrystallization, while those in the cold-rolled SSA-foils mainly transform into a strong cube component{001} <100> after discontinuous recrystallization. Finally, a maximized elongation to fracture of ~23.9%was achieved in the TSA-foil, much higher than that of the SSA-counterparts, ~8.3%. The relationships between the microstructure and mechanical properties were discussed. | Li Huang Guangjie Huang Yunchang Xin Lingfei Cao Xiaodong Wu Zhihong Jia Qilei Li Qing Liu | 2017 | Journal of Materials Science & Technology2017，33，9： | 1 |
| 8 | A quantitative study on planar mechanical anisotropy of a Mg-2Zn-1Ca alloy显示文摘A TD-tilted basal texture in Mg alloys often generates a strong planar mechanical anisotropy.Unfortunately,there has been not a quantitative study on this issue.In the present study,the mechanisms for the anisotropy of tensile yield strength in RD-TD plane were quantitatively studied for a Mg-2Zn-1Ca alloy with different grain sizes and textures.Here,RD and TD refer to the rolling direction and transverse direction of the plate.The results show that there is a strong planar yield anisotropy(~24±5 MPa),regardless of grain size,while this yield anisotropy is absent in texture with a circular distribution of basal poles.The examination of microstructure and X-ray diffraction analysis reveals that,beside basal slip as the predominant mode under both RD-tension and TD-tension,prismatic slip in RD-tension and both prismatic slip and extension twinning in TD-tension are also important.The parameters of Hall-Petch relation are also used to further analyze the mechanism for yield anisotropy.The changeable intercept,σ_(0),and invariant Hall-Petch slope,k,between RD-tension and TD-tension are rationalized accounting for this anisotropy.The reasons why there are differentσ0and similar k between TD-tension and RD-tension are quantitively discussed.At last,a texture design for decreasing the planar yield anisotropy is given. | Xinde Huang Yunchang Xin Yu Cao Guangjie Huang Wei Li | 2022 | Journal of Materials Science & Technology2022，，14： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员