十大最美妙摄影:日食“珠子项链”(图)(2)
2、墨西哥海湾死区面积相当于新泽西州
美国密西西比河三角洲是由该河流出口处的淤泥沉积形成的,每年夏季,混浊、富含营养物质的河水进入墨西哥海湾,在路易斯安那州和德克萨斯州海域形成世界上最大的“海洋死区”。
这一海洋死区中氧气含量非常低,这是由于营养物质聚集促进大量的水藻生长,消耗了水中的氧气。当水藻死亡沉入水底时,细菌在食用水藻时又消耗了水中的氧气,最终导致该水域无法适应其他鱼类生存。
2008年,墨西哥海湾海洋死区的面积达到8800平方英里,相当于新泽西州的面积。如图,该图片是由Terra卫星装配的热排放和反射辐射仪(ASTER)拍摄的。
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