Novel Methods to Observe Heat and Ice in the High Latitudes Using PIES

使用 PIES 观测高纬度地区的热量和冰的新方法

• 批准号: 1332911
• 负责人: Magdalena Andres
• 金额: $ 48.3万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2017-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1332911&HistoricalAwards=false
• 关键词: Novel; Methods; Observe; Heat; Ice

This project will develop and test a non-traditional method to measure the time-varying heat content and vertical temperature profile in high-latitude seas, shelves, and fjords using pressure-sensor-equipped inverted echo sounders (PIES). PIES, which are installed on the seafloor below the reach of destructive iceberg keels, present a promising and inexpensive way to improve understanding of fjord dynamics and shelf-fjord interactions and will increase long-term monitoring capabilities in high latitudes where remoteness and harsh conditions hamper traditional in situ observation techniques. The use of PIES to characterize variability at high latitudes is a novel repurposing of an existing technology, but rests on the same principle as the traditional blue-water uses for PIES: due to the dependence of sound speed on temperature, the surface-to-bottom round-trip acoustic-travel-time associated with reflections between the PIES and the air-sea interface is an excellent proxy for heat content in the intervening water column. Furthermore, since reflections from seawater-ice interfaces are also detected when ice is present, PIES also provide a means to characterize the ice component in high-latitude systems. The PIs propose to develop these methods with existing PIES data collected in a 1-year test deployment in Sermilik Fjord in eastern Greenland and with observations to be collected in a 2-year deployment of three PIES in the fjord and on the nearby shelf.

该项目将开发并测试一种非传统方法，以使用配备压力传感器的倒置回声声（PIES），在高纬度海洋，架子和峡湾中测量时变热量和垂直温度曲线。派安装在破坏性冰山龙骨覆盖范围以下的海底上，这是一种有希望且廉价的方式，可以提高人们对峡湾动态和架子峡湾相互作用的了解，并将在高纬度地区的长期监测能力上，在这种情况下，远程和恶劣条件的高纬度和恶劣条件阻碍了传统的现场观察技术。 The use of PIES to characterize variability at high latitudes is a novel repurposing of an existing technology, but rests on the same principle as the traditional blue-water uses for PIES: due to the dependence of sound speed on temperature, the surface-to-bottom round-trip acoustic-travel-time associated with reflections between the PIES and the air-sea interface is an excellent proxy for heat content in the intervening water column.此外，由于在存在冰时还检测到海水冰界面的反射，因此派还提供了一种表征高纬度系统中冰分的方法。 PI提议通过在格陵兰东部的Sermilik Fjord进行的1年测试部署中收集的现有派对数据来开发这些方法，并在峡湾和附近的架子上进行了2年部署三个派的观察结果。