March 29, 2009

今儿在keso那里看到这篇“罗布泊干涸之谜揭晓”,说起来我当年也去过一个盐湖,是加州和内华达州交界处的一个湖,叫做mono lake。这个湖跟罗布泊,还有死海等等世界上好多盐碱湖类似,都是逐渐干涸的水体。里面的盐碱或是来自当年的海水,或是来自注入的河流沿岸的盐碱地。因为蒸发的水多于注入的水,它们都是入不敷出的逐年干涸。

Mono lake 之所以著名,除了它碰巧在优色美地国家公园的东边以外,还有一个原因是里面的盐柱。盐柱英文叫tufa,是盐碱的结晶体混合了泥土。在mono lake,由于湖底含高盐碱的泉水在湖水里结晶,形成了泉眼周围的盐柱,然后随着湖水的蒸发,盐柱露出湖面,成为矗立在水中的盐柱。



盐碱湖的水因为多年浓缩的关系,浓度高的已经不能让任何鱼类生存。用手摸一下,可以感到很滑腻,类似洗衣粉水的感觉。但是这样的水里,依然有生命,mono lake里面有一种藻类,另外还有一种小虾靠吃这种藻类生存。





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