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死亡冰柱所到之處瞬間冰封www2.tvboxnow.com; F+ b. r) y# r2 s9 {
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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。公仔箱論壇2 {6 a6 s& Y8 u
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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。www2.tvboxnow.com; a2 U; `1 r6 y+ ]* h. L3 p7 A
7 X8 ^8 p/ }3 K3 O, O4 ~6 ctvb now,tvbnow,bttvb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。5 h3 o4 T6 i1 A# \
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8 p; y Q* J8 b$ V4 E6 F& b2 E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”公仔箱論壇% H2 ]; X8 q8 c; e$ j" L* T
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) U1 f" R u2 D T8 C& rtvb now,tvbnow,bttvbRemarkable 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 tvb now,tvbnow,bttvb" K9 }) H: S$ s! V1 V7 b
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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
0 e% D' i5 \" W7 a3 WTVBNOW 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。4 h. _" u& g4 o( L C R7 c \4 h2 P
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9 @1 z" N0 k$ F' P! [3 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。Killer: The ice floods outwards across the ocean surface rapidly, destroying everything in its wake
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Destruction: The starfish are frozen by the ice as it expands outwards公仔箱論壇, A! J* Y/ x9 \# n$ s/ R9 `8 d
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! g$ {# @6 N" G, EBroadcasting 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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