贵阳“端午水”与初夏降水的关系
Relationship between Dragon Boat Festival Water and Precipitation in Early Summer in Guiyang
中文摘要：
利用1951—2018年贵阳逐日降水资料，分析了贵阳历年端午期间降水特征，结果表明，贵阳出现“端午水”的概率为72%，多发生在节后。端午节出现在5月下旬和6月下旬的年份，发生端午水的概率为50%，降水强度不大；端午节出现在6月上旬和6月中旬的年份，极易发生端午水，概率达78%～91%，且降水强度增大。端午水对初夏降水影响显著，与盛夏降水关系不明显。无端午水年份，初夏降水出现偏少的可能性较大；端午水特多年份，初夏易发生洪涝灾害。端午期间西太平洋副高压西侧的东南季风偏强，青藏高原东侧多低压槽活动，有利于贵阳出现端午水。
中文关键词：
贵阳，端午水，初夏降水
KeyWords：
Guiyang, Dragon Boat Festival water, precipitation in early summer
Abstract：
The characteristics of precipitation during the Dragon Boat Festival periods (i.e., 1 May to 10 May in lunar calendar) in Guiyang was analyzed from the daily precipitation data of Guiyang in years 1951?2018. Specifcally, we focused on the Dragon Boat Festival water (DBFw), which is defned as the appearance of precipitation with rainfall intensity of ≥25 mm per day for at least one day or with cumulative rainfall being higher than long-term average by ≥25% during the Dragon Boat Festival periods. The results showed that the probability of occurrence of DBFw in Guiyang was 72%, and most of them occurred after the festival (5th May in lunar calendar). The Dragon Boat Festival occurred in late May and late June. The probability of occurrence of DBFw was 50%, and the precipitation intensity was not very strong. If the festival occurred in the frst 20 days of June, DBFw was very prone to occur with the probability of 78%?91%, and the precipitation intensity also increased. The in?uence of DBFw on precipitation in early summer was significant, whereas the DBFw had no influences on precipitation in midsummer. Less precipitation was received in early summer of the year without DBFw. In contrast, ?oods and waterlogging were prone to occur in early summer of the year with DBFw and large precipitation. During the Dragon Boat Festival, the southeast monsoon on the west side of the western Pacifc subtropical high was stronger, which was conducive to the emergence of the DBFw in Guiyang.