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太阳“流浪”了?南方罕见持续阴雨寡照天气将维持到3月上旬

2019-02-21 14:02:00    新华网

新华社北京2月21日电 题:太阳“流浪”了?南方罕见持续阴雨寡照天气将维持到3月上旬

新华社记者高敬

“太阳是去流浪了吗?”不少南方网友发出这样的“吐槽”。原来自从入冬以来,我国南方大部地区就出现了罕见持续阴雨寡照天气,导致公众极少见到太阳。让不少人失望的是,20日至21日,江南、华南等地出现大雨甚至暴雨,未来阴雨天气将持续到3月上旬。

中央气象台专家介绍,我国南方雨量充沛,但出现这样的持续性阴雨寡照天气也是罕见的——

一是阴雨持续时间长。2018年12月以来,江淮南部、江南及贵州大部、广西北部、福建北部等地降水日数普遍有40至55天,较常年和上年同期偏多10至15天;贵州、湖南、湖北、江西、浙江、安徽、江苏等7省平均降水日数均为1961年以来同期最多。

二是日照时数显著偏少。江淮南部、江汉、江南等地日照时数较常年同期偏少5至8成,单日日照时数≤3小时的天数普遍达55至70天;湖南、湖北、江西、浙江、安徽、江苏日照时数均为1961年以来历史同期最少。江苏、福建单日平均日照时数分别为2.5小时和2.6小时外,上述其余省份都不足2小时,湖南不足1小时。

三是伴随阶段性低温。南方地区阴雨寡照期间伴随有阶段性低温,尤其是2月7日以来,江淮、江汉、江南大部及贵州中东部、广西北部气温偏低2至6℃,加重了阴雨寡照的不利影响。

持续性阴雨寡照天气是如何形成的呢?记者从中央气象台了解到,自2018年9月以来,赤道中东太平洋海温持续偏高,进入厄尔尼诺状态,有利于冬季西太平洋副热带高压偏强偏西且稳定维持,加上南支槽阶段性活跃,引导了大量低纬度的水汽向我国南方地区输送;同时,入冬以来冷空气活动多,且势力较强,可以抵达我国南方地区。冷暖空气频繁在南方地区交汇,因而导致我国南方地区出现罕见的持续阴雨寡照天气。

气象专家表示,持续阴雨寡照和阶段性低温天气对南方地区生产生活、交通运输、人体健康等造成一定影响,特别是对农业生产的影响较大。油菜、蔬菜遭受湿渍害,长势偏弱,露地蔬菜产量下降。设施大棚光照不足,果蔬产量和品质都下降。

尽管如此,太阳短期内似乎很难“上岗”。中央气象台预计,2月下旬,江淮、江南、华南及西南地区东部仍将多阴雨天气,大部地区降水日数有6至9天,累计降水量较常年同期偏多1至3倍;气温较常年同期偏低1至3℃。其中20日至21日,湖南、江西、浙江、福建、广东、广西等地有中到大雨,局地有暴雨或大暴雨。3月上旬,南方地区仍多阴雨天气,大部地区累计降水量较常年同期偏多5成至1倍。

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