The Role of Double Diffusive Convection in the Mixing Process in the ocean

双扩散对流在海洋混合过程中的作用

基本信息

项目摘要

1.In the area of the western-north Pacific ocean, detailed observations of temperature, salinity and turbulent dissipation using CTD and Turbomap in 2004 and 2005 showed enhanced mixing processes might be due to double diffusive convection occurred in the area where typical water masses were contacted. Especially, off the Sanriku coast, double diffusive interleaving processes having high turbulent dissipation rate at the interfaces were observed from Thrbomap yo-yo observation.2.Simple one-dimensional temperature-salinity diffusion model parameterizing the vertical eddy diffusivities changing with density ratio were employed to investigate the development of vertical temperature and salinity profiles typically observed in the north Atlantic. We first successfully showed the formation of step structure caused by the convergence of density flux due to double diffusive convection. These steps having small vertical scale at first, merges to increase their thickness, and finally approaches smooth temperature and salinity profiles with the density ratio value 2. This final state is coincided with the observation.3.Mapping of density ratio in the world ocean from WOCE data set has been continued. In the course of this study, vertical eddy diffusivities are estimated through the density flux ratio due to double diffusive convection. We obtained 1 Munk (10^<-4>m^2/s) in the whole Atlantic Ocean and in the area around Antarctic Circumpolar Current. But, in the Pacific Ocean, the value was 10^<-6>m^2/s〜l0^<-5>m^2/s at most. These latter values are not sufficient to maintain the permanent thermocline, but the effect of double diffusive convection is not negligible for this process.
1.2004年和2005年利用CTD和Turbomap对西北太平洋西部海域的温度、盐度和湍流耗散的详细观测表明,在典型水团接触区域发生双扩散对流可能是混合过程增强的原因。特别是在三陆海岸附近,Thrbomap yo-yo观测观测到双扩散交错过程在界面处具有较高的湍流耗散率。采用参数化垂直涡旋扩散系数随密度比变化的简单一维温度-盐度扩散模型,研究了北大西洋典型垂直温度和盐度剖面的发展。我们首次成功地证明了双扩散对流引起的密度通量收敛导致阶梯结构的形成。这些步骤起初垂直尺度较小,然后合并增加厚度,最终趋于光滑的温度和盐度剖面,密度比为2。这种最终状态与观测结果是一致的。继续利用WOCE数据集绘制世界海洋的密度比。在研究过程中,通过双扩散对流的密度通量比估算垂直涡旋扩散系数。我们在整个大西洋和南极绕极流周围地区获得了1 Munk (10^<-4>m^2/s)。而在太平洋,其值最大为10^<-6>m^2/s ~ 10^< -5>m^2/s。后一种值不足以维持永久的温跃层,但双扩散对流对这一过程的影响不可忽略。

项目成果

期刊论文数量(6)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Deep western boundary current along the eastern slope of the Kerguelen Plateau in the Southern Ocean.
沿着南大洋凯尔盖朗高原东坡的深西边界流。
  • DOI:
  • 发表时间:
    2005
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Narumi Y.;Y.Kawamura;T.Kusaka;Y;Kitade;H.Nagashima
  • 通讯作者:
    H.Nagashima
Possible Density Change of the Origin of North Pacific Intermediate Water Due to Double Diffusion in the Mixed Water Region.
混合水区双重扩散可能导致北太平洋中层水来源的密度变化。
相模湾中央部で観測された内部潮汐の鉛直構造と間欠性
相模湾中部观测到的内潮汐的垂直结构和间歇性
  • DOI:
  • 发表时间:
    2004
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Narurmi Y;Y.Kawamura;T.Kusaka;Y.Kitade;H.Nagashima;北出裕二郎他
  • 通讯作者:
    北出裕二郎他
Possible density change of the origin of North Pacific Intermediate Water due to double diffusion in the Mixed Water Region
由于混合水区的双重扩散,北太平洋中层水源头的密度可能发生变化
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YOSHIDA Jiro其他文献

YOSHIDA Jiro的其他文献

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{{ truncateString('YOSHIDA Jiro', 18)}}的其他基金

The role of double diffusive convection on the mixing processes in the ocean
双扩散对流对海洋混合过程的作用
  • 批准号:
    14540405
  • 财政年份:
    2002
  • 资助金额:
    $ 10.43万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
The Effect of Double Diffusive Convention in the Mixing region at the oceanic front
海洋前沿混合区双重扩散对流的影响
  • 批准号:
    10640419
  • 财政年份:
    1998
  • 资助金额:
    $ 10.43万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
The Role of Double Diffusive Convection in the Mixing process of the Ocean
双扩散对流在海洋混合过程中的作用
  • 批准号:
    07640569
  • 财政年份:
    1995
  • 资助金额:
    $ 10.43万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
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