Laboratory measurements of high-frequency, broadband acoustic scattering of growing sea ice and oil beneath sea ice

2014 ◽  
Vol 135 (4) ◽  
pp. 2302-2302
Author(s):  
Christopher Bassett ◽  
Andone C. Lavery ◽  
Ted Maksym
Keyword(s):  
Sea Ice ◽  
High Frequency ◽  
Acoustic Scattering ◽  
Laboratory Measurements

scholarly journals Laboratory measurements of high-frequency, broadband acoustic scattering of growing sea ice and oil beneath sea ice

2014 ◽  
Author(s):  
Christopher Bassett ◽  
Andone Lavery ◽  
Ted Maksym ◽  
Jeremy P. Wilkinson
Keyword(s):  
Sea Ice ◽  
High Frequency ◽  
Acoustic Scattering ◽  
Laboratory Measurements

scholarly journals Laboratory measurements of high-frequency, acoustic broadband backscattering from sea ice and crude oil

2015 ◽  
Vol 137 (1) ◽  
pp. EL32-EL38 ◽  
Author(s):  
Christopher Bassett ◽  
Andone C. Lavery ◽  
Ted Maksym ◽  
Jeremy P. Wilkinson
Keyword(s):  
Sea Ice ◽  
Crude Oil ◽  
High Frequency ◽  
Laboratory Measurements

scholarly journals Ice-edge detection from Japanese C-band radar and high-frequency radar coastal stations

2013 ◽  
Vol 54 (62) ◽  
pp. 59-64 ◽  
Author(s):  
K. Shirasawa ◽  
N. Ebuchi ◽  
M. Leppäranta ◽  
T. Takatsuka
Keyword(s):  
Sea Ice ◽  
Edge Detection ◽  
High Frequency ◽  
Open Water ◽  
Radar Data ◽  
Hf Radar ◽  
Sea Surface ◽  
Geometrical Structures ◽  
Overlapping Data ◽  
Ice Edge

AbstractA C-band sea-ice radar (SIR) network system was operated to monitor the sea-ice conditions off the Okhotsk Sea coast of northern Hokkaido, Japan, from 1969 to 2004. The system was based on three radar stations, which were capable of continuously monitoring the sea surface as far as 60 km offshore along a 250 km long coastal section. In 2004 the SIR system was closed down and a sea surface monitoring programme was commenced using high-frequency (HF) radar; this system provides information on surface currents in open-water conditions, while areas with ‘no signal’ can be identified as sea ice. The present study compares HF radar data with SIR data to evaluate their feasibility for sea-ice remote sensing. The period of overlapping data was 1.5 months. The results show that HF radar information can be utilized for ice-edge mapping although it cannot fully compensate for the loss of the SIR system. In particular, HF radar does not provide ice concentration, ice roughness and geometrical structures or ice kinematics. The probability of ice-edge detection by HF radar was 0.9 and the correlation of the ice-edge distance between the radars was 0.7.

scholarly journals Assessing the Role of High‐Frequency Winds and Sea Ice Loss on Arctic Phytoplankton Blooms in an Ice‐Ocean‐Biogeochemical Model

2019 ◽  
Vol 124 (9) ◽  
pp. 2728-2750 ◽  
Author(s):  
L. Castro de la Guardia ◽  
Y. Garcia‐Quintana ◽  
M. Claret ◽  
X. Hu ◽  
E. D. Galbraith ◽  
...  
Keyword(s):  
Sea Ice ◽  
High Frequency ◽  
Biogeochemical Model ◽  
Phytoplankton Blooms ◽  
Ocean Biogeochemical Model

scholarly journals Measurements of acoustic scattering from zooplankton and oceanic microstructure using a broadband echosounder

2009 ◽  
Vol 67 (2) ◽  
pp. 379-394 ◽  
Author(s):  
Andone C. Lavery ◽  
Dezhang Chu ◽  
James N. Moum
Keyword(s):  
High Frequency ◽  
System Performance ◽  
Pulse Compression ◽  
Acoustic Scattering ◽  
Single Frequency ◽  
Frequency Range ◽  
Range Resolution ◽  
Continuous Frequency ◽  
Processing Techniques ◽  
Signal Processing Techniques

Abstract Lavery, A. C., Chu, D., and Moum, J. N. 2010. Measurements of acoustic scattering from zooplankton and oceanic microstructure using a broadband echosounder. – ICES Journal of Marine Science, 67: 379–394. In principle, measurements of high-frequency acoustic scattering from oceanic microstructure and zooplankton across a broad range of frequencies can reduce the ambiguities typically associated with the interpretation of acoustic scattering at a single frequency or a limited number of discrete narrowband frequencies. With this motivation, a high-frequency broadband scattering system has been developed for investigating zooplankton and microstructure, involving custom modifications of a commercially available system, with almost complete acoustic coverage spanning the frequency range 150–600 kHz. This frequency range spans the Rayleigh-to-geometric scattering transition for some zooplankton, as well as the diffusive roll-off in the spectrum for scattering from turbulent temperature microstructure. The system has been used to measure scattering from zooplankton and microstructure in regions of non-linear internal waves. The broadband capabilities of the system provide a continuous frequency response of the scattering over a wide frequency band, and improved range resolution and signal-to-noise ratios through pulse-compression signal-processing techniques. System specifications and calibration procedures are outlined and the system performance is assessed. The results point to the utility of high-frequency broadband scattering techniques in the detection, classification, and under certain circumstances, quantification of zooplankton and microstructure.

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