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为了满足专业气象用户对专业化、精细化、个性化的服务需求,解决气象信息跨平台发布问题,实现移动端信息自动推送,本文借助"江门市气象公共服务中心"微信企业号、新浪云服务器SAE(Sina App Engine),采用PHP网络编程语言搭建了专业气象跨平台发布系统,并阐明了系统关键技术:(1)SAE与企业号多应用API对接,实现多应用统一管理;(2)建立基于KVDB缓存的接口访问凭证,提高信息发布效率;(3)利用定时任务及消息异步执行,实现超阈值消息自动发布,并减少群发消息时的阻塞和延迟;(4)不同阈值条件的消息推送机制,实现多种类气象产品同步发布。该系统在一定程度上提升了专业气象服务水平,为用户创造了经济效益,将为全国各地"互联网+气象"跨平台发布提供一个良好的建设思路。 相似文献
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闪电电涌对区域自动气象站的破坏机理及闪电电涌防御技术 总被引：1，自引：0，他引：1
从雷电对架空电力线的作用、雷电流能量对信号线路的耦合、闪电通道空间辐射3个方面分析了闪电电涌对自动气象站的破坏机理,然后以新会某自动气象站为例,提出了防闪电电涌侵入的综合措施,最后得出结论:电涌保护器的安装级别应根据被保护设备的耐压值来确定;使用具有高磁导率的铁质金属管对线缆进行完整屏蔽能够抑制耦合过电压;闪电通道的空间辐射是防不胜防的,在自动气象站选址时,应尽量参考闪电定位仪数据,避开雷电高发区,从源头上减小雷击概率。 相似文献
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通过搭建WAMP(Windows+Apache+MySQL+PHP)环境获取实时闪电定位数据和电场强度资料,基于Python语言的NumPy, Pandas, Matplotlib以及Cartopy等模块,实现了多种雷电监测预警产品的可视化。以2017年7月20日江门一次雷电过程可视化平台监测为例,介绍了Python雷电监测预警可视化平台的开发原理及各类雷电监测预警产品。基于Python的实时雷电监测预警可视化平台借助Windows下dos批处理命令和任务计划程序,以及新浪云云应用服务器(Sina App Engine)的Storage存储服务,实现了各类雷电监测产品的实时自动更新。该平台具有实时、简洁和轻量化特点,适合公众及专业气象用户使用,具有一定的业务推广应用价值。 相似文献
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In this paper, the data of Automatic Weather Stations (AWSs), ERA5 reanalysis, sounding, wind profile radar, and dual-polarization radar are used to study an extreme rainfall event in the south China Coast on 11 to 12 May 2022 from the aspects of thermodynamics and microphysical characteristics under the influence of low-level jets (LLJs). Results show that: (1) The extreme rainfall event can be divided into two stages: the first stage (S1) from 0000 to 0600 LST on May 12 and the second stage (S2) from 0700 to 1700 LST on the same day. During S1, the rainfall is mainly caused by the upper-level shortwave trough and the boundary layer jet (BLJ), characterized by strong upward motion on the windward side of mountains. In S2, the combined influence of the BLJ and synoptic-system-related low-level jet (SLLJ) increases the vertical wind shear and vertical vorticity, strengthening the rainstorm. In combination with the effect of topography, a warm and humid southwest flow continuously transports water vapor to farther north, resulting in a significant increase in rainfall over the study area (on the terrain’s windward slope). From S1 to S2, the altitude of a divergence center in the upper air decreases obviously. (2) The rainfalls in the two stages are both associated with the mesoscale convergence line (MCL) on the surface, and the wind field from the mesoscale outflow boundary (MOB) in S1 is in the same direction as the environmental winds. Due to a small area of convergence that is left behind the MOB, convection moves eastward quickly and causes a short duration of heavy rainfall. In S2, the convergence along the MOB is enhanced, which strengthens the rainfall and leads to strong outflows, further enhancing the surface convergence near the MOB and forming a positive feedback mechanism. It results in a slow motion of convection and a long duration of heavy rainfall. (3) In terms of microphysics, the center of a strong echo in S1 is higher than in S2. The warm-rain process of the oceanic type characterizes both stages, but the convective intensity in S2 is significantly stronger than that in S1, featuring bigger drop sizes and lower concentrations. It is mainly due to the strengthening of LLJs, which makes small cloud droplets lift to melting levels, enhancing the ice phase process (riming process), producing large amounts of graupel particles and enhancing the melting and collision processes as they fall, resulting in the increase of liquid water content (LWC) and the formation of large raindrops near the surface. 相似文献
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利用粤港澳闪电定位以及江门新会电场强度资料，挑选了2017年14次强雷电天气过程，对比分析了闪电发生前的电场强度和差分电场强度分布特征，进一步检验了电场阈值和差分电场阈值下雷电预警效果。结果表明：(1)新会电场站附近闪电密度中心达到18次/km2,西北部闪电密度高，东南部低。(2)闪电距离越近，发生闪电前30 min产生的最大电场、平均电场强度越强，闪电的差分电场值较大，10～20 km闪电产生的电场极性较为稳定。(3)用电场阈值进行预警时，新会电场阈值设定建议不超过6 kV/m;用差分电场阈值进行预警，能提高临界成功指数(CSI)、降低虚警率(FAR),对于中短距离(14 km内)的闪电预警效果更好。(4)对于准确预警的雷电，雷电距离越近，或电场(差分电场)阈值越大，雷电预警的提前量越小；采用差分电场阈值时，较采用电场阈值的预警提前量整体减小，阈值5 kV/m内10～20 km雷电预警提前量下降更为明显。 相似文献
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