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南方大范围高温天气将持续至30日 “罪魁祸首”是它

2017-07-26 10:46:13   新华网

7月23日全国日最高气温监测图。

记者:南方高温过程偏强的主要原因是什么?

陈双:造成此次南方大范围高温天气的“罪魁祸首”就是西太平洋副热带高压(简称副高),这次高温比较严重的上海、苏南、浙北等地刚好就处在这个天气系统的中心附近。一般说来,在副高控制区域内,盛行下沉气流,不利于云的产生,往往为晴空少云天气,利于太阳辐射对近地层大气的持续加热。另外,由于空气在下沉过程中会伴随有增温现象,这也在一定程度上造成副高控制区域容易产生高温天气。7月以来,副热带高压一直较为强盛,造成南方多地温度屡创新高。

西太平洋副热带高压下沉增温示意图。

记者:在持续性高温天气下,如何做好防御措施?

陈双:尽量避免午后高温时段的户外活动,对老、弱、病、幼人群提供防暑降温指导,并采取必要的防护措施;有关部门应注意防范因用电量过高,电线、变压器等电力设备负载大而引发火灾;户外或者高温条件下的作业人员应当采取必要的防护措施;注意作息时间,保证睡眠,必要时准备一些常用的防暑降温药品;媒体应加强防暑降温保健知识的宣传,各相关部门落实防暑降温保障措施。

记者:7、8号台风对目前的持续性高温天气能否起到缓解作用?近期是否有台风生成?

高栓柱:对中国地区而言,7、8号台风的影响基本结束。7号台风“洛克”23日上午于香港西贡沿海地区登陆,给广东带来明显的风雨;而8号台风“桑卡”也于25日下午14时30分前后在越南中部沿海登陆,其前期给海南岛南部的部分地区带来降水。所以,这两个台风在我国影响的主要区域是海南和广东的部分地区,对目前我国中东部大范围的高温天气影响不大。

本月,台风直接影响南方高温区域的可能性不大。在未来一旬左右,西北太平洋和南海大概会有2~3个台风生成,其中一个将可能影响我国东南沿海地区。

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