Observations and characteristics of the Ice-Ocean Boundary Layer in McMurdo Sound, Antarctica

Beecroft, Ryan, Cossu, Remo, Forrest, Alexander, Hawes, Ian and Lemckert, Charles (2016). Observations and characteristics of the Ice-Ocean Boundary Layer in McMurdo Sound, Antarctica. In: 23rd IAHR International Symposium on Ice. IAHR International Symposium on Ice, Ann Arbour, MI, United States, (). 31 May - 3 June 2016.

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Name Description MIMEType Size Downloads
Author Beecroft, Ryan
Cossu, Remo
Forrest, Alexander
Hawes, Ian
Lemckert, Charles
Title of paper Observations and characteristics of the Ice-Ocean Boundary Layer in McMurdo Sound, Antarctica
Conference name IAHR International Symposium on Ice
Conference location Ann Arbour, MI, United States
Conference dates 31 May - 3 June 2016
Convener IAHR
Proceedings title 23rd IAHR International Symposium on Ice
Publisher IAHR
Publication Year 2016
Sub-type Fully published paper
Open Access Status Not Open Access
Total pages 12
Collection year 2017
Language eng
Formatted Abstract/Summary
Observation and analysis of Antarctic ice-ocean boundary layer formation is crucial to understanding paramount physical and biological interactions between sea-ice and ocean waters. Velocity measurements were made in November 2014 using Acoustic Doppler Current Profilers (ADCPs) moored in ~2m thick first year sea-ice in McMurdo Sound, Antarctica. Additionally, ADCPs mounted to an Autonomous Underwater Vehicle (AUV) were used to profile horizontal transects of up to 500m in length at 6-8m below the ice-ocean interface. A diurnal tidal cycle was observed with the stationary ADCP with maximum horizontal velocities in the range of 0.16-0.18ms-1. Laminar sub-layer thicknesses of up to 12m were identifiable from the stationary ADCP measurements over various stages of the tidal cycle, with the most pronounced velocity profiles corresponding to the flood tide events in McMurdo Sound. The first ever comparison under-ice of stationary ADCP and AUV mounted ADCP measurements yields a relatively good agreement of the under-ice velocity distribution during periods of maximum flow velocity; yet velocity variability of the AUV measurements (0.07-0.15ms-1) are considerably higher than those recorded by the stationary ADCP (0.01ms-1). Ultimately, this study provides a comparison of stationary ADCP and AUV mounted ADCP measurements, with the aim of fortifying the application of AUVs in under-ice environments. In particular, this is critical for measurements within the highly dynamic boundary layer region close to the under-ice surface, which have proven difficult to observe through conventional methods. The study focuses on velocity measurements within the first 25m beneath the ice, coinciding with physical measurements (temperature, salinity and density) to describe the observed boundary layer characteristics.
Keyword Autonomous Underwater Vehicles
McMurdo Sound
Spatial variability of tidal currents
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status UQ
Additional Notes https://www.iahr.org/site/cms/contentviewarticle.asp?article=658

Document type: Conference Paper
Collections: School of Civil Engineering Publications
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Created: Mon, 11 Jul 2016, 11:37:22 EST by Remo Cossu on behalf of School of Civil Engineering