Conductivity-Temperature-Depth (CTD) Survey in Wolstenholme Fjord, Greenland, April 2017

The principal investigators of this project propose to design and develop an integrated underwater acoustic sensor network for ice-covered

seas. The sensor and communication network will support 1) long-term, intelligent distributed Arctic observing systems, 2) assimilation of remote-sensing and in-situ under-ice measurements, and 3) regional and global climate modeling with real-time measurements. Such a network holds the promise to revolutionize under-ice ocean sampling in polar regions.
Ocean water properties in Wolstenholme Fjord adjacent to Thule Air Base (TAB) in Greenland were profiled at 68 discrete stations in April 2017. The fjord was covered by land-fast sea ice and thus provided a stable platform from which to test, deploy, and recover a range of oceanographic and acoustic sensor systems via snowmobiles during day-light hours in April when air temperatures are generally above -25 °C.

We collected about 4-7 stations per section at ~10 sections that crossed bathymetric features such as entrance channels, basins, and sills. Sections with 1-2 km station spacing were also placed across Moltke, Knud Rasmussen, and Chamberlin Glaciers.

本项目的首席研究员拟设计并开发一套面向覆冰海域的集成式水下声传感器网络。该传感器与通信网络将支撑三大应用方向：1）长期智能化分布式北极观测系统；2）遥感与冰下原位（in-situ）测量数据同化；3）基于实时测量数据的区域与全球气候模拟。此类网络有望彻底革新极地海域的冰下海洋采样工作。

2017年4月，研究团队在格陵兰岛毗邻图勒空军基地（TAB）的沃尔斯滕霍尔姆峡湾的68个离散测站上完成了海水物性剖面测量。该峡湾被固定海冰覆盖，为科考作业提供了稳定平台：2017年4月期间，当地白天气温普遍高于-25℃，研究人员可借助雪地摩托在日间开展多套海洋学与声传感器系统的测试、布放与回收作业。

研究团队在跨越入口航道、海盆与海槛等地形特征的约10条测线上，每条测线布设4至7个测站；同时在莫尔特克冰川、克努德·拉斯穆森冰川与钱伯林冰川沿线，布设了测站间距为1至2公里的测线。