移动新媒体用户规模和气象信息传播的相关性分析   总被引：1，自引：0，他引：1  

达月珍  赵庆 《气象研究与应用》2019,40(1):108-111

通过分析天气类App和气象微信公众号受众规模变化与气象信息传播方式之间的关联和存在的问题,在切合移动新媒体传播特征基础上,在及时、准确、简洁传播天气预报核心信息的前提下,对气象信息与其它行业信息进行融合研究和开发,形成特色和个性,聚合某一类需求的人群,形成社群,才能增加用户规模,实现传播平台信息差异化和有效传播。  相似文献   

气象科技成果业务应用的痛点和机制改革探索     

黄海洪  黄小燕  李玉红 《气象研究与应用》2019,40(1):96-98,95

以需求为牵引,问题为导向,分析气象科技成果应用的新需求,找出了传统气象科技成果应用的痛点和机制管理的弊端,并以天气预报科技成果业务转化为例,提出了科技成果应用新型管理体系的设想。新型管理体系的构建原则及体系框架,对新管理体系的实施关键环节进行了分析。新型管理模式可望有效改进传统管理体系存在的问题,明显提高科技成果转化的效益,使科技成果真正为气象业务现代化建设提供有力的科技支撑。  相似文献   

龙滩库区2017年4月20-21日降水过程人工增雨条件分析     

黄冬梅  朱麟  韦家宝  黄肖寒  赖晟 《气象研究与应用》2019,40(1):57-61

利用Micaps常规资料、欧洲再分析资料及地面自动气象观测站数据,分析2017年4月20～21日河池市天峨县龙滩库区降水过程的人工增雨作业实施条件。结果表明:春季,当有南支槽、切变线及地面冷空气等系统配合时,能够为降雨提供充足的水汽及较好的动力抬升条件;作业点上空大气层结不稳定,中低层水汽含量丰富,利于对流云团发展和维持;云系垂直累积液态水含量在0.1mm以上,云顶温度在-45℃～-25℃之间,具备冷云增雨条件,实施增雨作业是合理的。  相似文献   

CCN浓度对安徽一次强对流天气影响的数值模拟          下载免费PDF全文

闵锦忠  靳奎峰  陈虹杏  庄潇然  丁伟 《大气科学学报》2019,42(4):542-551

应用WRF(Weather Research and Forecasting)模式,采用NSSL初始CCN数据(C=600 cm~(-3)、k=0.6)及南京北郊观测拟合数据(C=4 000 cm~(-3)、k=0.47)对安徽省一次强对流天气进行模拟。结果发现CCN浓度(CASE2)增大后,所模拟的最大雷达反射率较初始情况(CASE1),在强度和云体宽度上更加接近实况,且CASE2生成了更多强对流单体;CASE2的降水落区较CASE1更为接近实况,且中心雨强大于CASE1,这主要由CASE2中第一个单体更强的降水导致,而两者第二个单体贡献值相近。在过程初期,CASE2中云水、冰晶粒子数浓度比CASE1更大,使得云水粒子冻结时释放出比CASE1更多的热量,从而使得云体发展更为旺盛;两者单位质量中雪晶质量和数浓度相差不大;CASE2比CASE1霰雹粒子比含水量更高,从而在融化过程中形成了更强的冷云降水。  相似文献   

沙漠气象若干问题研究进展   总被引：2，自引：1，他引：1       下载免费PDF全文

霍文  智协飞  杨莲梅  买买提艾力&#;买买提依明  周成龙  杨帆  杨兴华  孟露  何清 《大气科学学报》2019,42(3):469-480

沙漠占据地球陆地面积的1/4,沙漠天气和气候对全球生态、环境及气候等的影响一直都受到社会各界极大关注。本文参考国内外有关沙漠气象学研究的代表性著作,简要回顾了沙漠气象学的国内外发展历史,并从沙漠表层物理特性研究、沙漠天气与边界层研究、沙漠气候研究、沙漠影响区域及全球环境研究等多个方面阐述了沙漠气象学的研究进展。最后对沙漠气象学研究提出了展望。  相似文献   

The Tibetan Plateau Surface–Atmosphere Coupling System and Its Weather and Climate Effects: The Third Tibetan Plateau Atmospheric Science Experiment     

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 《Journal of Meteorological Research》2019,(3):375-399

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.  相似文献   

Impact of Surface Potential Vorticity Density Forcing over the Tibetan Plateau on the South China Extreme Precipitation in January 2008. Part Ⅱ:Numerical Simulation     

Jiahui YU  Yimin LIU  Tingting MA  Guoxiong WU 《Journal of Meteorological Research》2019,(3):416-432

The surface air convergence on the eastern flank of the Tibetan Plateau (TP) can increase the in situ surface potential vorticity density (PVD). Since the elevated TP intersects with the isentropic surfaces in the lower troposphere, the increased PVD on the eastern flank of TP thus forms a PVD forcing to the intersected isentropic surface in the boundary layer. The influence of surface PVD forcing over the TP on the extreme freezing rain/snow over South China in January 2008 is investigated by using numerical experiments based on the Finite-volume Atmospheric Model of the IAP/LASG (FAMIL). Compared with observations, the simulation results show that, by using a nudging method for assimilating observation data in the initial flow, this model can reasonably reproduce the distribution of precipitation, atmospheric circulation, and PVD propagation over and downstream of the TP during the extreme winter precipitation period. In order to investigate the impact of the increased surface PVD over the TP on the extreme precipitation in South China, a sensitivity experiment with surface PVD reduced over the TP region was performed. Compared with the control experiment, it is found that the precipitation in the TP downstream area, especially in Southeast China, is reduced. The rainband from Guangxi Region to Shandong Province has almost disappeared. In the lower troposphere, the increase of surface PVD over the TP region has generated an anomalous cyclonic circulation over southern China, which plays an important role in increasing southerly wind and the water vapor transport in this area;it also increases the northward negative absolute vorticity advection. In the upper troposphere, the surface PVD generated in eastern TP propagates on isentropic surface along westerly wind and results in positive absolute vorticity advection in the downstream areas. Consequently, due to the development of both ascending motion and water vapor transport in the downstream place of the TP, extremely heavy precipitation occurs over southern China. Thereby, a new mechanism concerning the influence of the increased surface PVD over the eastern TP slopes on the extreme weather event occurring over southern China is revealed.  相似文献   

A Review of Research on Warm-Sector Heavy Rainfall in China     

Jianhua SUN  Yuanchun ZHANG  Ruixin LIU  Shenming FU  Fuyou TIAN 《大气科学进展》2019,36(12):1299-1307

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一种基于快速傅里叶变换的多普勒天气雷达弱杂波识别方法          下载免费PDF全文

周雪松  孟金  姚蔚 《山东气象》2019,39(4):43-51

多普勒天气雷达探测时常会出现电磁干扰和超折射等杂波干扰问题,通过对弱径向干扰回波的规律性特征分析,提出了一种基于快速傅里叶变换的多普勒天气雷达干扰回波识别算法,并成功应用于多普勒天气雷达径向干扰回波的识别中。研究表明,一些干扰回波具有明显的空间周期性规律,对反射率因子进行快速傅里叶变换,得到的频域上能量分布具有与常规回波明显的差异。依靠这些差异可以较好地对一些弱的干扰回波进行识别并剔除。该方法对径向上离散分布的干扰回波均有较好的识别能力,但对相对均匀和密实的径向干扰回波识别能力较弱。  相似文献   

一种无线遥测自动气象站远程检测控制模块的研制     

赵建凯  安学武  包伟智  李博 《内蒙古气象》2019,(2):46-48

为了节省无线遥测自动气象站死机故障排除时需要耗费的人力物力,研制了一种远程检测控制模块,包括硬件电路的设计、固件程序设计、调试制作等。通过对无线遥测自动气象站进行远程重启或自动重启,实现死机故障的排除。同时可以远程读取自动气象站运行时的电压情况,对电池性能进行分析。该模块接入无线遥测自动气象站后,在自动气象站出现死机故障时无需工作人员前往现场处理。  相似文献