Formation of the well mixed homogeneous layer in the bottom water of the Japan Sea
Formation of the well mixed homogeneous layer in the bottom water of the Japan Sea
复制标题
日本海底层水混合均匀层的形成
DOI：
10.1007/s10872-015-0303-7
复制
发表时间：
2015
影响因子：
2.3
通讯作者：
Michio Watanabe
中科院分区：
文献类型：
--
作者：
Takeshi Matsuno;Takahiro Endoh;Toshiyuki Hibiya;Tomoharu Senjyu;Michio Watanabe
日本海的深层和底层沃茨（水深约1000 m）具有低温和弱分层的特点。特别是在日本海盆，底层水（深度约2500 m），称为日本海底层水（JSBW），厚度超过1000 m，大部分是均匀的。近几十年来的一些研究表明，JSBW的位温正在逐渐增加，即使厚均匀的垂直结构被保持。虽然从上层向下混合的热量被认为是负责这一特征，我们的微观结构测量发现，在JSBW湍流的强度太弱，解释逐渐变暖厚均匀层的形成。通过使用一维数值模型，我们证明，这一特点的JSBW可以合理地解释的基础上，从海底地热加热和适当的水平供应冷水的底层。
The deep and bottom waters of the Japan Sea (depth ≳ 1000 m) are characterized by low temperature and weak stratification. In the Japan Basin, especially, the bottom water (depth ≳ 2500 m), called the Japan Sea bottom water (JSBW), with a thickness of over 1000 m, is mostly homogeneous. Several studies in recent decades have suggested that the potential temperature of the JSBW is gradually increasing, even though the thick homogeneous vertical structure is being maintained. Although downward mixing of heat from the upper layer was believed to be responsible for this characteristic feature, our microstructure measurements found that the intensity of turbulence in the JSBW is too weak to explain the formation of the gradually warming thick homogeneous layer. By use of a one-dimensional numerical model we demonstrated that this characteristic feature of the JSBW can be reasonably explained on the basis of a combination of geothermal heating from the seabed and an appropriate horizontal supply of cold water to the bottom layer.