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新东方优美背诵短文50篇 Unit39:The Salinity of Ocean Waters

时间:2007-11-21 02:45来源:互联网 提供网友:36263626   字体: [ ]
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If the salinity1 of ocean waters is analyzed2, it is found to vary only slightly from place to place. Nevertheless, some of these small changes are important. There are three basic processes that cause a change in oceanic salinity. One of these is the subtraction3 of water from the ocean by means of evaporation4--- conversion6 of liquid water to water vapor5. In this manner the salinity is increased, since the salts stay behind. If this is carried to the extreme, of course, white crystals of salt would be left behind.

The opposite of evaporation is precipitation, such as rain, by which water is added to the ocean. Here the ocean is being diluted8 so that the salinity is decreased. This may occur in areas of high rainfall or in coastal9 regions where rivers flow into the ocean. Thus salinity may be increased by the subtraction of water by evaporation, or decreased by the addition of fresh water by precipitation or runoff.

Normally, in tropical regions where the sun is very strong, the ocean salinity is somewhat higher than it is in other parts of the world where there is not as much evaporation. Similarly, in coastal regions where rivers dilute7 the sea, salinity is somewhat lower than in other oceanic areas.

A third process by which salinity may be altered is associated with the formation and melting of sea ice. When sea water is frozen, the dissolved materials are left behind. In this manner, sea water directly materials are left behind. In this manner, sea water directly beneath freshly formed sea ice has a higher salinity than it did before the ice appeared. Of course, when this ice melts, it will tend to decrease the salinity of the surrounding water.

In the Weddell Sea Antarctica, the densest10 water in the oceans is formed as a result of this freezing process, which increases the salinity of cold water. This heavy water sinks and is found in the deeper portions of the oceans of the world.


海水盐度如果我们分析海水的盐度,会发现地区间只有轻微的变化,然而有些小的变化是重要的。
导致海洋的盐度变化的基本过程有三个,其中之一是通过蒸发的方式即把液态水转化为水蒸气来减少海洋中的水分。这样由于盐留了下来,所以盐度增大。
当然,如果这种方式走向极端,将会余下白色的盐晶体。与蒸发相反的是降水,如降雨,由此水被加入海中,海水被稀释,从而盐度降低。
这种情形会发生在大量降雨的地区,或江河入海岸处。因此,盐度通过蒸发减少水分而上升或通过降水或径流增加淡水成分而下降。一般来说,在阳光很
强烈的热带地区,海水的盐度略高于世界上其它没有热带那样多的蒸发的地区。同理,在江河稀释海水的海岸地带,海水盐度略低于其它海区。
第三个可以变更盐度的过程与海洋中冰的形成和融化有关。海水冻结时,溶于其中的物质被留了下来。这样,在新形成的海
水冰面的正下方的海水比在冰形成之前有更高的盐度。当然,当冰融化的时候,会降低周围水中的盐度。
在南极洲边缘的威德尔海中,结冰过程增加低温海水的盐度,从而形成了浓度最大的海水。这些大密度的海水下沉,可以在世界海洋的深水域发现。

 


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1 salinity uYvx9     
n.盐分;咸度;盐浓度;咸性
参考例句:
  • In the sea water sampled the salinity is two parts per thousand.在取样的海水中,盐度为千分之二。
  • In many sedimentary basins the salinity of the formation water increases with depth or compaction.在许多沉积盆地中,地层水的含盐量随深度或压实作用而增高。
2 analyzed 483f1acae53789fbee273a644fdcda80     
v.分析( analyze的过去式和过去分词 );分解;解释;对…进行心理分析
参考例句:
  • The doctors analyzed the blood sample for anemia. 医生们分析了贫血的血样。 来自《简明英汉词典》
  • The young man did not analyze the process of his captivation and enrapturement, for love to him was a mystery and could not be analyzed. 这年轻人没有分析自己蛊惑著迷的过程,因为对他来说,爱是个不可分析的迷。 来自《简明英汉词典》
3 subtraction RsJwl     
n.减法,减去
参考例句:
  • We do addition and subtraction in arithmetic.在算术里,我们作加减运算。
  • They made a subtraction of 50 dollars from my salary.他们从我的薪水里扣除了五十美元。
4 evaporation Pnoxc     
n.蒸发,消失
参考例句:
  • Be careful not to lose too much liquid by evaporation.小心不要因蒸发失去太多水分。
  • Our bodies can sweat,thereby losing heat by evaporation.我们的身体能出汗,由此可以蒸发散热。
5 vapor DHJy2     
n.蒸汽,雾气
参考例句:
  • The cold wind condenses vapor into rain.冷风使水蒸气凝结成雨。
  • This new machine sometimes transpires a lot of hot vapor.这部机器有时排出大量的热气。
6 conversion UZPyI     
n.转化,转换,转变
参考例句:
  • He underwent quite a conversion.他彻底变了。
  • Waste conversion is a part of the production process.废物处理是生产过程的一个组成部分。
7 dilute FmBya     
vt.稀释,冲淡;adj.稀释的,冲淡的
参考例句:
  • The water will dilute the wine.水能使酒变淡。
  • Zinc displaces the hydrogen of dilute acids.锌置换了稀酸中的氢。
8 diluted 016e8d268a5a89762de116a404413fef     
无力的,冲淡的
参考例句:
  • The paint can be diluted with water to make a lighter shade. 这颜料可用水稀释以使色度淡一些。
  • This pesticide is diluted with water and applied directly to the fields. 这种杀虫剂用水稀释后直接施用在田里。
9 coastal WWiyh     
adj.海岸的,沿海的,沿岸的
参考例句:
  • The ocean waves are slowly eating away the coastal rocks.大海的波浪慢慢地侵蚀着岸边的岩石。
  • This country will fortify the coastal areas.该国将加强沿海地区的防御。
10 densest 196f3886c6c5dffe98d26ccca5d0e045     
密集的( dense的最高级 ); 密度大的; 愚笨的; (信息量大得)难理解的
参考例句:
  • Past Botoi some of the densest jungle forests on Anopopei grew virtually into the water. 过了坊远湾,岛上的莽莽丛林便几乎直长到水中。
  • Earth is the densest of all of these remaining planets. 地球是所剩下行星中最致密的星球。
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TAG标签:   新概念  背诵  短文  salinity  water
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