Adiabatic density surface, neutral density surface, potential density surface, and mixing path *
Adiabatic density surface, neutral density surface, potential density surface, and mixing path *
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绝热密度面、中性密度面、势密度面和混合路径*
DOI：
10.11978/j.issn.1009-5470.2014.04.001
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发表时间：
2014
影响因子：
3.7
通讯作者：
HU Rui
中科院分区：
文献类型：
--
作者：
HU Rui
本文对绝热密度面、中性密度面和势密度面进行了比较。绝热密度面被定义为水团在其上可以绝热运动而不改变其潜在温度和盐度的表面。对于在给定站点和压力水平下采集的水团，可以通过简单的计算来确定相应的绝热密度面。这种表面在世界海洋中是中性浮力的，不同于其他不是真正中性浮力的表面。为了探索海洋中的混合路径，引入了混合比m，它定义为在海洋中的一段迁移过程中，与环境交换的水团的潜在温度和盐度的部分。海洋中混合路径的两种极端情况是m=0(不混合)，由绝热密度曲线表示，以及m=1，其中原始信息通过混合完全丢失。后者由中性密度曲线表示。现实存在于两者之间，即0<；m<；1。在汹涌的海洋中，潜在地有无限的混合路径，其中一些可以通过使用不同的示踪剂(或其组合)和不同的混合标准来识别。在真实海洋中寻找混合路径是一个巨大的挑战
In this paper, adiabatic density surface, neutral density surface and potential density surface are compared. The adiabatic density surface is defined as the surface on which a water parcel can move adiabatically, without changing its potential temperature and salinity. For a water parcel taken at a given station and pressure level, the corresponding adiabatic density surface can be determined through simple calculations. This family of surface is neutrally buoyant in the world ocean, and different from other surfaces that are not truly neutrally buoyant. In order to explore mixing path in the ocean, a mixing ratio m is introduced, which is defined as the portion of potential temperature and salinity of a water parcel that has exchanged with the environment during a segment of migration in the ocean. Two extreme situations of mixing path in the ocean are m=0 (no mixing), which is represented by the adiabatic density curve, and m=1, where the original information is completely lost through mixing. The latter is represented by the neutral density curve. The reality lies in between, namely, 0<m<1. In the turbulent ocean, there are potentially infinite mixing paths, some of which may be identified by using different tracers (or their combinations) and different mixing criteria. Searching for mixing paths in the real ocean presents a great challenge for further