Horizontal Profiles of Upper Ocean Temperature and Salinity During ANZFLUX

这项工作是威德尔海东部上部混合层海洋学结构综合研究项目（Anzflux）的一部分。它将在1994年南部冬季从纳撒尼尔·b·帕尔默RVIB进行。本文提出的工作是对温度和盐度的水平变化进行高分辨率测量，以帮助确定相干对流特征的三维结构。测量将使用远程操作的自由测距水下航行器（自主电导率温度航行器- ACTV）上的仪器进行。威德尔海东部假定的高海洋热通量值要求存在一种增强垂直热通量的机制。这种机制可能是混合层中的相干滚动不稳定性，冰中引线和其他开口下的对流，或内部波。单点测量只能表明这些机制的存在；要确定特定的机制，就需要有关其水平变异性的信息。ACTV长160厘米，直径9厘米，能以每秒2米的速度运行1小时。它可以被设定为距离一个归航信标1.5公里远的航线，每次可以跑5公里。它携带商用的温度计和电导率传感器，其精度优于千分之一度和三万分之一盐度单位。该车辆将在海冰上设置的一个小而轻便的小屋中操作，并将通过一个直径一米的洞展开和回收。＊＊＊

9317020 Morison The proposed work is part of an integrated research program ("Anzflux") into the oceanographic structure of upper mixed layer of the eastern Weddell Sea. It is to be carried out from the RVIB Nathaniel B. Palmer in the austral winter of 1994. The work proposed here is to make high resolution measurements of the horizontal variability of temperature and salinity to help determine the three-dimensional structure of coherent convection features. The measurements will be made with instruments on a remotely operated free-ranging underwater vehicle (the Autonomous Conductivity Temperature Vehicle -- ACTV). The postulated high oceanic heat flux values in the eastern Weddell Sea require the existence of a mechanism that enhances the vertical heat flux. Possible such mechanisms are coherent roll instabilities in the mixed layer, convection under leads and other openings in the ice, or internal waves. Single point measurements can only suggest the existence of these mechanisms; the identification of the particular mechanism requires information on their horizontal variability. The ACTV, which is 160 centimeters long and 9 centimeters in diameter, is capable of one hour of operation at a speed of two meters per second. It can be programmed to dead reckoned course as far as 1.5 kilometers from a homing beacon, and can cover about five kilometers per run. It carries commercially available thermometers and conductivity sensors whose precision is better than one thousandths of a degree and one part in thirty thousand salinity units. The vehicle will be operated from a small, light- weight hut set up on the sea ice, and will be deployed and recovered through a one meter diameter hole. ***