Autosub Long Range beneath Ronne Ice Shelf (2018): hydrographic, velocity and turbulence observations along the Modified Warm Deep Water Inflow

Autosub Long Range (ALR) was deployed along the Modified Warm Deep Water Inflow beneath Ronne Ice Shelf in February 2018 as part of the Ice shelves in a warming world: Filchner Ice Shelf system large grant, Antarctica. The vehicle was equipped with a Seabird Conductivity-Temperature-Depth (CTD) sensor, two Teledyne Acoustic Doppler Current Profilers (ADCPs), one upward looking and one downward looking, and a nose-mounted Rockland Scientific International MicroRider turbulence package. ALR followed a rhumb line course beneath the ice shelf, running approximately parallel to the 400 m isobath. The vehicle alternated between stretches of bottom tracking and top tracking in a square-wave pattern, while maintaining a minimum clearance of 80 m between the vehicle and the ice base or seabed. Funding was provided by the UK Natural Environment Research Council Large Grant Ice shelves in a warming world: Filchner Ice Shelf system, Antarctica (Grant No. NE/L013770/1).

远程自主水下航行器（Autosub Long Range，ALR）于2018年2月被部署至南极洲龙尼冰架下方的改性暖深水流入区域，作为"Ice shelves in a warming world: Filchner Ice Shelf system"（变暖世界中的冰架：菲尔希纳冰架系统）大型研究资助项目的组成部分。该设备搭载了海鸟公司（Seabird）的电导率-温度-深度（Conductivity-Temperature-Depth，CTD）传感器、两台特莱迪公司（Teledyne）的声学多普勒流速剖面仪（Acoustic Doppler Current Profilers，ADCPs）——分别为向上观测型与向下观测型——以及机头安装的罗克兰科学国际公司（Rockland Scientific International）MicroRider湍流测量组件。ALR沿冰架下方的恒向线航线航行，大致平行于400米等深线。航行过程中，该设备以方波模式交替切换底跟踪与冰底跟踪模式，并始终保持与冰架底部或海底至少80米的净空距离。本项目由英国自然环境研究理事会大型资助项目"Ice shelves in a warming world: Filchner Ice Shelf system, Antarctica"（变暖世界中的冰架：南极洲菲尔希纳冰架系统，资助编号：NE/L013770/1）提供资金支持。