梅雨,是在中国长江中下游地区、台湾地区、日本中南部以及韩国南部等地,每年6、7月份都会出现持续天阴有雨的气候现象,由于正是江南梅子的成熟期,故称其为“梅雨”,那么梅雨的意思是什么呢?
梅雨的意思详解
梅雨指的是持续天阴有雨的气候现象,梅雨是指一定地区和一定季节内发生的天气气候现象,梅雨是东亚地区特有的天气气候现象,在中国则是长江中下游特有的天气气候现象。
梅雨是指每年6月中旬到7月上、中旬初夏,中国长江中下游指宜昌以东的28-34°N范围内或称江淮流域,至日本南部这狭长区域内出现的一段连阴雨天气。
初夏江淮流域一带经常出现一段持续较长的阴沉多雨天气。此时,器物易霉,故亦称“霉雨”,简称“霉”;又值江南梅子黄熟之时,故亦称“梅雨”或“黄梅雨”。6月中旬以后,雨带维持在江淮流域,就是梅雨。
梅雨形成条件
1.在亚洲的高纬度地区对流层中部有阻塞高压或稳定的高压脊,大气环流相对稳定少变。
2.中纬度地区西风环流平直,频繁的短波活动为江淮地区提供冷空气条件。
3.西太平洋副热带高压有一次明显西伸北跳过程,500hPa副高脊线稳定在北纬20度至25度之间,暖湿气流从副高边缘输送到江淮流域。在这种环流条件下,梅雨锋徘徊于江淮流域,并常常伴有西南涡和切变线,在梅雨锋上中尺度系统活跃。不仅维持了梅雨期连续性降水,而且为暴雨提供了充沛的水气。
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