The Baltic Sea is the world’s least saline sea, with an average salinity1 of just 7–8 grams per kilogram of water (0.7–0.8%), far below the global ocean average of 35‰. This is due to its semi-enclosed geography, high freshwater input2 from rivers (e.g., the Neva and Vistula), limited exchange with the North Sea, and heavy rainfall. Its northern parts, like the Gulf3 of Bothnia, can even drop to 2‰. The low salinity supports unique ecosystems4 but also causes winter freezing.
世界上盐度最低的海是波罗的海,平均盐度仅为7–8‰(0.7–0.8%),远低于全球海水平均盐度(35‰)。成因包括半封闭地形、大量河流淡水注入(如涅瓦河、维斯瓦河)、与北海交换受限及降水丰富。其北部波的尼亚湾盐度可低至2‰。低盐度孕育了独特生态,但也导致冬季结冰。
1
salinity [sə'lɪnətɪ]
![]() |
|
n.盐分;咸度;盐浓度;咸性 | |
参考例句: |
|
|
2
input [ˈɪnpʊt]
![]() |
|
n.输入(物);投入;vt.把(数据等)输入计算机 | |
参考例句: |
|
|
3
gulf [gʌlf]
![]() |
|
n.海湾;深渊,鸿沟;分歧,隔阂 | |
参考例句: |
|
|
4
ecosystems [ˈekəʊˌsɪstəmz]
![]() |
|
n.生态系统( ecosystem的名词复数 ) | |
参考例句: |
|
|