
2 M- z* `% d/ p' U/ d" [www2.tvboxnow.com死亡冰柱所到之處瞬間冰封
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% k$ Q7 p# Z) }2 B5 f5 l( {+ r* E( t2 n南極長年冰天雪地,人跡罕至,不少奇怪異象都是世人從未見過,英國廣播公司( BBC)攝製隊,早前首次在南極海底拍攝到“死亡冰柱”( icicle of death),冰柱下沉到海床后,所到之處周遭的海水都會凝結,海膽、海星全被凍死,蔚為奇觀。
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其實這種死亡冰柱自 1960年代已開始存在,通常當南極海洋混入了帶鹽份的水后就會出現,不過今次還是首度有人拍攝到這個奇景。拍攝當日,海底水溫只得-2℃,BBC攝影師米勒( Hugh Miller)及安德森( Doug Anderson)在南極羅斯群島( Ross Archipelago)的小剃刀背島( Little Razorback Island)海中,親眼目擊死亡冰柱的形成過程。
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由於冰柱的密度較海水高,因此一直朝海床沉下,並迅速擴張,周遭接觸到冰柱的海水隨即變冷凝固,但看上去像海綿狀多過普通海冰,而附近的海洋生物,如海膽及海星等,因冰柱的溫度太低而全被凍死。
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. {, C6 T! ?8 m1 L$ {4 v; w8 ^# n' v+ Mtvb now,tvbnow,bttvb米勒憶述當日親眼目擊冰柱沉下並迅速擴張,仍感到有點難以置信,“這情況有點像與時間競賽,因為沒有人真正知道它們形成得有多快。我們一星期前看到的那條冰柱,在我們面前迅速擴張變長,整個過程只用了5、6小時”
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, o" F% y9 K. `5 }+ ATVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。Remarkable broadcast moment: The ice begins to expand outwards. The brine is a lot more dense than seawater so sinks to the bottom. It is also a lot colder - causing the freezing 公仔箱論壇- R3 g _2 |9 O! V* D; ? V
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Touchdown: The brinicle reaches the ocean floor. Starfish can be seen. Often the brinicles break up before they become so large
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+ J6 r2 A4 J+ [, F: s, k4 UKiller: The ice floods outwards across the ocean surface rapidly, destroying everything in its wake4 F' G4 L5 U% S' T
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0 {% l& `/ Q4 U& t" @www2.tvboxnow.comDestruction: The starfish are frozen by the ice as it expands outwards+ S) H1 d! c+ g4 F* I8 o! H
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/ s3 s, P. Q2 U$ j+ pBroadcasting feat: Although the existence of brinicles has long been known it is the first time they have ever been caught on camera
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Seabed spread: When the seawater freezes as it comes into contact with the brinicle it is a lot more spongelike than normal ice
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