BBC纪录片《冰冻星球》履于薄冰第8期:反射太阳的能量

[00:00:47]Killer whales are now a much more common sight in the Arctic. 现在在北极也常常可以见到虎鲸了 [00:03:51]Their tall fins make it difficult for them to travel under ice, 长长的鳍虽阻碍了它们在冰下穿梭 [00:09:01]but the longer summers mean they can travel much further north 但更长的夏天使它们能去到更北的地方 [00:12:40]and make the most of the rich Arctic seas. 充分利用北极海洋里丰富的资源 [00:16:29]For animals and people, 在变幻莫测的北极 [00:24:56]it will be those that can adapt 对动物和人来说 [00:26:53]who will thrive in a changing Arctic. 只有适者才能生存 [00:38:02]But the loss of sea ice isn't just an issue for the Arctic, 冰雪融化不单纯是北极的问题 [00:41:17]because the state of the ice affects the climate of the whole planet. 因为冰雪的状态影响了整个地球的气候 [00:48:20]Because it's white, 冰雪是白色的 [00:49:53]the ice reflects up to 90% of the Sun's energy. 它能将90%的太阳能量反射回去 [00:53:51]This is called the albedo effect 这叫做反射效应 [00:56:14]and it's why we often see heat haze in the Arctic, 这就是为什么在北极 [00:58:50]even when the air feels cold. 即使很冷 也能看到热霾 [01:06:18]The frozen Arctic Ocean acts as a huge reflector,bouncing back the Sun's heat into space. 冰冻的北冰洋就像一块巨大的反射镜将太阳的热量反射回去 [01:15:18]Throughout history, that has helped to cool the planet, 自古以来 这能帮助地球降温 [01:19:18]but when the ice melts, it's a different story. 一旦冰雪融化就将是另外一番景象了 [01:26:51]Because sea water is dark, 因为海水是深色的 [01:30:57]it absorbs most of the Sun's heat. 它吸收了大部分太阳的热量 [01:34:08]In the Arctic, this can trigger a chain reaction, 在北极 这会触发连锁反应 [01:37:15]as the warming water melts more ice, 更多的冰雪被渐暖的海水融化了 [01:39:45]exposing more water to the Sun's heat. 变成了更多的海水 吸收太阳的热量

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