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溪流笔谈▏“雪窝子”为何“偏爱”威海、烟台?

  • 2026-02-15 13:23:59
溪流笔谈▏“雪窝子”为何“偏爱”威海、烟台?
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日前,山东烟台、威海等地遭遇强降雪,局地现暴雪。有网友调侃“烟台的雪下冒烟了”。“雪窝子”是山东半岛北部沿海地区,尤其是威海和烟台的别称,因其冬季降雪量远超周边地区而得名。这一独特现象主要由冷流雪(又称海效应降雪)的频繁发生所导致,其形成与威海、烟台两地独特的地理位置和气候条件密切相关。

所谓冷流雪,也称“冷流降雪”,是由于海上富含水汽,且海水的水温在冬季相较内陆的地表温度更高,海面上方的空气相对温暖湿润,当冷空气南下时,海面上方的暖湿空气升至一定高度,就会凝结成雪花,飘落下来,形成降雪。

冷流降雪常发生于我国黄海、渤海沿海地区,也见于江苏、上海、辽宁等东部沿海地区,最典型的在烟台、威海一带,冷流雪占总降雪日数的比例高达80%以上。这种降雪的形成需要三个关键条件同时满足:

一是冷空气过暖海面:冬季西伯利亚强冷空气南下,经过渤海和黄海北部时,由于海水热容量大(冬季海温约0-5℃,高于同期陆地气温),冷空气底层从海面吸收大量水汽和热量,变得暖湿。

二是不稳定层结形成:干冷空气经过暖海面后,形成上冷下暖的不稳定大气结构,暖湿空气被迫抬升,水汽遇冷迅速凝结成冰晶,形成对流云团。

三是地形抬升增幅:当这些富含水汽的云团被西北风推向山东半岛时,遇到半岛中部东西向的丘陵山地(如昆嵛山、崂山余脉)阻挡,被迫沿山坡爬升。地形抬升使空气进一步冷却,水汽凝结效率大幅提高,降雪强度显著增强。

那么,为何偏爱威海、烟台?主要与威海、烟台独特的地理位置有关。

威海、烟台位于山东半岛最东端,北、东、南三面濒临渤海和黄海其一威海、烟台两地地理位置恰好处于冷空气南下第一站来自北方的冷空气长驱直入,首先经过渤海湾,海气温差最大其二威海、烟台两地属于水汽输送通道渤海相对封闭,对马暖流影响使冬季海温偏高,水汽供应充足且稳定其三威海、烟台两地处于迎风坡位置两城位于丘陵北侧,正对西北风来向,成为地形抬升的迎风坡”。

其次渤海暖池效应是关键。渤海是半封闭海域,冬季降温慢,与南下的强冷空气温差可达15-20℃以上。这种巨大的海气温差为空气对流提供了充足能量,使冷流雪云团发展旺盛。而黄海、东海等其他海域,要么海温偏低,要么冷空气路径不同,难以形成如此强烈的热力对比。

最后山东半岛中部丘陵呈东西走向,海拔虽不高(多在500米以下),但恰好垂直于西北风方向,对暖湿气流的抬升作用非常明显。威海、烟台正位于丘陵北侧,地形增幅作用使降雪量比周边地区高出2-3倍。而其他沿海地区要么地势平坦(如江苏沿海),要么山脉走向与风向平行(如辽东半岛),抬升作用有限。

全国典型区域降雪特征对比

地区

年均冷流雪日数

降雪特点

关键限制因素

威海、烟台

30-40天

强度大、局地性强、积雪深

三要素完美配合

青岛

10天

降雪量明显偏少

位于背风坡,地形抬升弱

大连

15天

降雪量中等

海陆配置不如烟威理想

江苏沿海

极少

几乎无冷流雪

海温偏低,冷空气路径偏东

气象统计显示,烟台莱山机场区域年均冷流雪日数达39天左右,威海约33天,冷流雪占两地冬季降雪总量的80%以上。2023年12月,威海文登积雪深度达74厘米,创下历史记录。这种降雪强度和频次,在全国同纬度沿海地区绝无仅有。

总结一下,全国其他沿海地区难以复制烟威的雪窝现象,原因在于:一是渤海湾的独特性渤海是半封闭浅海,冬季海温相对较高且稳定,为冷流雪提供了持续的水汽源。其他海域如黄海、东海,要么海温偏低,要么冷空气路径不同,难以形成强烈的海气温差。二是地形配置的巧合山东半岛中部丘陵的走向、高度和位置,恰好与西北风垂直,抬升作用最强辽东半岛、江苏沿海等地要么地势平坦,要么山脉走向不匹配。三是冷空气路径冬季强冷空气主要沿西北路径南下,烟威正处风口,而其他沿海城市如上海、宁波等,冷空气到达时已减弱,海气温差不足。

对此,中国气象科学研究院副研究员李浩然表示:冷流雪的形成,与海气的温差密切相关海面温度和过境冷空气的温差越大,越容易形成冷流雪。他认为,每年冬季,我国的冷空气,也就是寒潮,一般来自北边的西伯利亚,沿着西北-东南方向移动。经过渤海上空时,这种下部湿热上部干冷的热力条件很容易形成冷流云,并且在长距离穿越洋面的过程中就容易形成海上降雪。我国的烟威地区位于山东半岛的东北,是渤海上空冷流雪的主要登陆地区。同时,该地区的地形以丘陵为主,冷流云被迫沿山坡爬升,有利于降雪的加强。“这就相当于给已经吸饱水的云层又用力‘拧了一把毛巾’,能‘挤’出远超平原地区的降雪量。”李浩然形象地比喻道。

威海、烟台成为雪窝子是地理位置(三面环海)海陆热力(渤海暖池)地形抬升(丘陵迎风坡)三大要素缺一不可的天作之合。这种特殊的地理气候配置在全国沿海地区极为罕见,因此冷流雪偏爱威海、烟台这两个城市,形成了独特的雪窝现象,就不难理解了

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■本文依据央视新闻、大众新闻、中国之声、搜狐科技、齐鲁电视台等相关内容综合撰写

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  1. CONNECT:[ UseTime:0.001032s ] mysql:host=127.0.0.1;port=3306;dbname=g460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001544s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000701s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000640s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001368s ]
  6. SELECT * FROM `set` [ RunTime:0.000823s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.002310s ]
  8. SELECT * FROM `article` WHERE `id` = 462445 LIMIT 1 [ RunTime:0.001839s ]
  9. UPDATE `article` SET `lasttime` = 1772144599 WHERE `id` = 462445 [ RunTime:0.021177s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000997s ]
  11. SELECT * FROM `article` WHERE `id` < 462445 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001662s ]
  12. SELECT * FROM `article` WHERE `id` > 462445 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001612s ]
  13. SELECT * FROM `article` WHERE `id` < 462445 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003744s ]
  14. SELECT * FROM `article` WHERE `id` < 462445 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.010132s ]
  15. SELECT * FROM `article` WHERE `id` < 462445 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004052s ]
0.227540s