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  • 南極旅行

    • 南極,英文:Antarctica;法文:Antarctique,被人們稱為第七大陸,是地球上最后一個被發現、唯一沒有人員定居的大陸。南極大陸的總面積為1390萬平方千米,相當于中國和印巴次大陸面積的總和,居世界各洲第五位。整個南極大陸被一個巨大的冰蓋所覆蓋,平均海拔為2350米。南極洲蘊藏的礦物有220余種。

    • 南極大陸是指南極洲除周圍島嶼以外的陸地,是世界上發現最晚的大陸,它孤獨地位于地球的最南端。南極大陸95%以上的面積為厚度極高的冰雪所覆蓋,素有“白色大陸”之稱。在全球6塊大陸中,南極大陸大于澳大利亞大陸,排名第5。

    • 南極大陸是最難接近的大陸。與南極大陸最接近的大陸是南美洲,它們之間是970千米寬的德雷克海峽。南極大陸與其他大陸不僅相距遙遠,而且周圍還為數公里乃至數百公里的冰架和浮冰所環繞,冬天時浮冰的面積可達1900萬平方千米;即使在南極的夏天,其面積也有260萬平方千米;南極大陸周圍海洋中還漂浮著數以萬計的巨大的冰山,為海上航行造成了極大的困難和危險。

    • 這是世界上最寒冷、風最大的地方。氣溫仍在可怕的零下五十攝氏度上下徘徊,剛剛回升的太陽光線幾乎沒有一絲絲暖意。很少有動物能夠忍受如此極端惡劣的環境。可是帝企鵝可以。站在冰封的海面上,它們感受到了南極地區暴風雪強大的威力。只有相互擠在一起,它們才能度過冬季寒風刺骨的幾個月。它們輪流去抵擋猛烈的寒風。帝企鵝只能生活在這里,因為南極大陸四周被南大洋環繞,沒有任何陸地食肉動物能夠到達這里。所以與北極動物不同,它們不會受到北極熊的威脅。

    • 北極地區的氣候終年寒冷。北冰洋是一片浩瀚的冰封海洋,周圍是眾多的島嶼以及北美洲和亞洲北部的沿海地區。北極是指地球自轉軸的北端,也就是北緯90°的那一點。冬季,太陽始終在地平線以下,大海完全封凍結冰。夏季,氣溫上升到冰點以上,北冰洋的邊緣地帶融化,太陽連續幾個星期都掛在天空。

    • 北極熊是世界上第二大的熊科動物,也是第二大的陸地食肉動物,過去人們一直認為北極熊是最大的陸地食肉動物,直到在科迪亞克島發現了880千克的科迪亞克棕熊,北極熊才屈居第二(如果不計入亞種,北極熊仍是最大的陸地食肉動物)。雄性北極熊身長大約2.4-2.6米,體重一般為400-600千克,甚至可達800千克。而雌性北極熊體形約比雄性小一半左右,身長約1.9-2.1米,體重約200-300千克。到了冬季睡眠時刻到來之前,由于脂肪將大量積累,它們的體重可達500千克。

    • 經過100多年的發展,當今世界的破冰船技術已經相當完備和發達。為了適應極地的惡劣條件,極地破冰船的設計有不少特點。首先,為了保證船體結構的堅固,極地破冰船船艏是鈍圓形,船殼鋼板比一般船舶要厚得多,通常使用抗撞擊合金來加強,在水線等區域還需要額外加厚鋼板。俄羅斯極地破冰船的船艏外殼厚度超過50毫米。此外,破冰船船身肋骨都需要用型鋼鍛造,而且肋骨分布密集。

    • 南極大陸與世隔絕,海拔也很高,有些地方接近五千米,這里比北極寒冷許多。冰層慢慢從中心地帶滑向邊緣,形成巨大的冰川。冬天,南極大陸本身加上周圍冰凍的海水,面 積擴大了一倍。海岸邊厚厚的冰層在整個南極大陸四周向外延伸了數百公里遠。

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