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Spatiotemporal computing of cold wave characteristic in recent 52 years: a case study in Guangdong Province, South China

机译：近52年来冷浪特征的时空计算-以中国广东省为例

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摘要

Based on daily air-temperature data of 86 weather stations in recent 52 years (1961-2012) in Guangdong Province, South China, annual cold wave events in each station were calculated. Then, the spatiotemporal characteristics of cold wave over Guangdong Province were thoroughly analyzed by wavelet transform and other statistical analysis method. The results indicate that: (1) The cold wave frequency gradually decreased from north to south, from inland to coastal area and from highland to lower land showing evident regional variance; if there occurred a large range of cold wave, the temperature fall caused by cold wave would be bigger in southwestern area than in the rest of Guangdong Province; (2) 161 regional cold wave events in total invaded Guangdong in recent 52 years. The cold waves can be classified into three invasion paths: north, northeast and west. Most of cold waves took the north path, and a few of them took the west path only; (3) Based on the influence range, the cold wave can be divided into 4 grades. The climatic characteristic of each grade shows that the larger the range of influence was, the more severe the hazard of cold wave would be; (4) Cold wave whose influence range was smaller than 10 % of provincial area happened almost every year, and the frequency was 1.9 annually; cold wave whose influence range was larger than 50 % happened 13 times in recent 52 years; (5) The intensity of cold wave over Guangdong was declining at the rate of 5.5 station-day per year; it also had an inter-decadal oscillation period of 10-14 years, and an obvious inter-annual oscillation period of 3-4 years before 2000; (6) Cold wave frequency of each month varied significantly, 76 % of which occurred during December to next February; (7) The snow disaster of 2008 had caused great losses to Guangdong agriculture. But according to the criteria of cold wave, only 22 stations (25 %) of Guangdong actually reached the standard of cold wave. Therefore, the cold disaster index should be additionally considered when analyzing the impact of disaster by cold air process, and the relationship between cold wave and cold disaster is worth further research.
机译：根据最近52年（1961-2012年）中国广东省的86个气象站的日气温数据，计算了每个气象站的年度冷潮事件。然后，利用小波变换和其他统计分析方法，对广东省冷浪的时空特征进行了全面分析。结果表明：（1）冷浪频率由北向南，由内陆向沿海，由高地向低地逐渐减小，区域差异明显。如果发生大范围的冷浪，西南地区的冷浪造成的温度下降将比广东省其他地区大。 （2）近52年来，共发生161次区域性冷潮事件侵袭广东。冷浪可以分为三个侵入路径：北，东北和西。大部分的寒潮沿着北路，而只有少数沿着西路。 （3）根据影响范围，可将冷潮分为4级。各年级的气候特征表明，影响范围越大，寒潮的危害就越严重。 （4）几乎每年发生影响范围小于全省的10％的冷浪，频率为每年1.9次。近52年来，影响范围大于50％的冷浪发生了13次。 （5）广东省冷浪强度以每年5.5站日的速度下降;在2000年之前，它的年代际振荡周期为10-14年，明显的年际振荡周期为3-4年。 （6）每月的冷浪频率变化很大，其中76％发生在12月至次年2月。 （7）2008年的雪灾给广东农业造成了巨大损失。但是根据冷浪标准，广东实际上只有22个台站（25％）达到了冷浪标准。因此，在分析冷空气过程对灾害的影响时，应另外考虑冷灾指数，冷浪与冷灾之间的关系值得进一步研究。

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