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 请老稀和老加去尝尝家门口的海水是不是很淡 |
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芦笛
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加入时间: 2004/02/14
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作者：芦笛 在 驴鸣镇 发贴, 来自 http://www.hjclub.org
刚才进来，看见欧客网友的回复，颇感兴趣，遂效法他也去网上查了一下，发现世界各地的海洋的盐浓度并不一样：
由图可见，波罗的海的盐浓度确实很低，约为31，而地中海的确实比大西洋还高，有趣的是，太平洋东端的盐浓度也颇低，温哥华的海水盐浓度大概为32，旧金山大约33。这俩地方我都去过，旧金山还不止一次，可惜都忘记在那儿尝尝海水了。一般情况下我也不会这么做，之所以在瑞典这么干，乃是因为要判定那儿桥下的水到底是河水还是海水。
所以，请老稀和老加去海边尝尝那水是不是比较淡。当然凭味觉毕竟无法准确判断，例如我觉得南海的水也很咸，我当年在里面游泳，呛了口水都觉得无法忍受，虽然北戴河的水似乎确实要淡一些，然而按照该图，南海盐浓度的远不如地中海，整个来说，太平洋的水的盐浓度要大西洋的淡。
谢谢欧客再度指教，然而英文维基百科上的解释未把波罗的海的盐浓度与其发生过程联系在一起，其主要理由与当地人的解释差不多：大量河水流入稀释了：
The Baltic Sea's salinity is much lower than that of ocean water (which averages 35‰), as a result of abundant freshwater runoff from the surrounding land, combined with the shallowness of the sea itself; indeed, runoff contributes roughly one-fortieth its total volume per year, as the volume of the basin is about 21,000 km³ and yearly runoff is about 500 km³. The open surface waters of the central basin have salinity of 6 to 8 ‰. At the semi-enclosed bays with major freshwater inflows, such as head of Finnish Gulf with Neva mouth and head of Bothnian gulf with close mouths of Lule, Tornio and Kemi, the salinity is considerably lower. Below 40 to 70 m, the salinity is between 10 and 15 ‰ in the open Baltic Sea, and more than this near Danish Straits.
The flow of fresh water into the sea from approximately two-hundred rivers and the introduction of salt from the South builds up a gradient of salinity in the Baltic Sea. Near the Danish straits the salinity is close to that of the Kattegat, but still not fully oceanic, because the saltiest water that passes the straits is still already mixed with considerable amounts of outflow water. The salinity steadily decreases towards North and East. At the northern part of the Gulf of Bothnia the water is no longer salty and many fresh water species live in the sea. The salinity gradient is paralleled by a temperature gradient. These two factors limit many species of animals and plants to a relatively narrow region of Baltic Sea.
The most saline water is vertically stratified in the water column to the north, creating a barrier to the exchange of oxygen and nutrients, and fostering completely separate maritime environments.[23]
作者：芦笛 在 驴鸣镇 发贴, 来自 http://www.hjclub.org |
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