scholarly journals In situ measurements and analysis of ocean waves in the Antarctic marginal ice zone

2014 ◽  
Vol 41 (14) ◽  
pp. 5046-5051 ◽  
Author(s):  
Michael H. Meylan ◽  
Luke G. Bennetts ◽  
Alison L. Kohout
Keyword(s):  
Ocean Waves ◽  
In Situ Measurements ◽  
Marginal Ice Zone ◽  
The Antarctic

scholarly journals Frazil Ice in the Antarctic Marginal Ice Zone

2021 ◽  
Vol 9 (6) ◽  
pp. 647
Author(s):  
Felix Paul ◽  
Tommy Mielke ◽  
Carina Schwarz ◽  
Jörg Schröder ◽  
Tokoloho Rampai ◽  
...  
Keyword(s):  
Rheological Properties ◽  
Flow Behavior ◽  
Real Data ◽  
Ocean Waves ◽  
Ice Cover ◽  
Ice Crystals ◽  
Frazil Ice ◽  
Marginal Ice Zone ◽  
The Antarctic

Frazil ice, consisting of loose disc-shaped ice crystals, is the first ice that forms in the annual cycle in the marginal ice zone (MIZ) of the Antarctic. A sufficient number of frazil ice crystals form the surface “grease ice” layer, playing a fundamental role in the freezing processes in the MIZ. As soon as the ocean waves are sufficiently damped by a frazil ice cover, a closed ice cover can form. In this article, we investigate the rheological properties of frazil ice, which has a crucial influence on the growth of sea ice in the MIZ. An in situ test setup for measuring temperature and rheological properties was developed. Frazil ice shows shear thinning flow behavior. The presented measurements enable real-data-founded modelling of the annual ice cycle in the MIZ.

scholarly journals Brief communication: Grease Ice in the Antarctic Marginal Ice Zone

2021 ◽  
Author(s):  
Felix Paul ◽  
Tommy Mielke ◽  
Carina Nisters ◽  
Jörg Schröder ◽  
Tokoloho Rampai ◽  
...  
Keyword(s):  
Sea Ice ◽  
Rheological Properties ◽  
Annual Cycle ◽  
Flow Behavior ◽  
Ocean Waves ◽  
Ice Cover ◽  
Ice Crystals ◽  
Frazil Ice ◽  
Marginal Ice Zone ◽  
The Antarctic

Abstract. Frazil ice, consisting of loose disc-shaped ice crystals, is the very first ice that forms in the annual cycle in the marginal ice zone (MIZ) of the Antarctic. A sufficient number of frazil ice crystals forms the surface grease ice layer taking a fundamental role in the freezing processes in the MIZ. As soon as the ocean waves are sufficiently damped, a closed ice cover can form. In this brief communication we investigate the rheological properties of frazil ice, which has a crucial influence on the growth of sea ice in the MIZ. Grease ice shows shear thinning flow behavior.

scholarly journals Ocean wave speed in the Antarctic marginal ice zone

2001 ◽  
Vol 33 ◽  
pp. 350-354 ◽  
Author(s):  
Colin Fox ◽  
Tim G. Haskell
Keyword(s):  
Wave Propagation ◽  
Large Scale ◽  
Wave Speed ◽  
Ross Sea ◽  
Ocean Waves ◽  
Wave Speeds ◽  
Marginal Ice Zone ◽  
Scale Properties ◽  
Ice Floes ◽  
The Antarctic

AbstractThe propagation of ocean waves in the marginal ice zone (MIZ) is investigated with the aim of determining whether the loading and scattering of waves by ice floes is significant. Measurements made using instrumented ice floes in the MIZ north of the Ross Sea, Antarctica, during June 1998 are used to determine the frequency-wavelength relationship for propagating ocean waves in that region. This measured-dispersion equation is related to the effective large-scale properties of the MIZ that occur in models for wave propagation and scattering. We present the measured wave speeds to enable estimation of the parameters in these models.

scholarly journals Spatial-temporal variations in surface ozone over Ushuaia and the Antarctic region: observations from in situ measurements, satellite data, and global models

2017 ◽  
Vol 25 (3) ◽  
pp. 2194-2210 ◽  
Author(s):  
Mohd Shahrul Mohd Nadzir ◽  
Matthew J. Ashfold ◽  
Md Firoz Khan ◽  
Andrew D. Robinson ◽  
Conor Bolas ◽  
...  
Keyword(s):  
Satellite Data ◽  
Surface Ozone ◽  
Temporal Variations ◽  
In Situ Measurements ◽  
Antarctic Region ◽  
Global Models ◽  
The Antarctic

In situ measurements of an energetic wave event in the Arctic marginal ice zone

2015 ◽  
Vol 42 (6) ◽  
pp. 1863-1870 ◽  
Author(s):  
Clarence O. Collins ◽  
W. Erick Rogers ◽  
Aleksey Marchenko ◽  
Alexander V. Babanin
Keyword(s):  
In Situ Measurements ◽  
The Arctic ◽  
Marginal Ice Zone ◽  
Wave Event

Spatial variability of ocean waves, from in-situ measurements

2013 ◽  
Vol 57 ◽  
pp. 83-98 ◽  
Author(s):  
I.G.C. Ashton ◽  
J-B. Saulnier ◽  
G.H. Smith
Keyword(s):  
Spatial Variability ◽  
Ocean Waves ◽  
In Situ Measurements

In situ measurements of total reactive nitrogen, total water, and aerosol in a polar stratospheric cloud in the Antarctic

1989 ◽  
Vol 94 (D9) ◽  
pp. 11299 ◽  
Author(s):  
D. W. Fahey ◽  
K. K. Kelly ◽  
G. V. Ferry ◽  
L. R. Poole ◽  
J. C. Wilson ◽  
...  
Keyword(s):  
In Situ Measurements ◽  
Reactive Nitrogen ◽  
Total Water ◽  
Polar Stratospheric Cloud ◽  
The Antarctic

The Carbon:²³⁴Thorium ratios of sinking particles in the California Current Ecosystem 2: Examination of a thorium sorption, desorption, and particle transport model

2019 ◽  
Author(s):  
Michael Stukel ◽  
Thomas Kelly
Keyword(s):  
Organic Carbon ◽  
Water Column ◽  
Particulate Organic Carbon ◽  
Transport Model ◽  
California Current ◽  
In Situ Measurements ◽  
Power Law Distribution ◽  
Sinking Particles ◽  
Organic Carbon Concentration

Thorium-234 (234Th) is a powerful tracer of particle dynamics and the biological pump in the surface ocean; however, variability in carbon:thorium ratios of sinking particles adds substantial uncertainty to estimates of organic carbon export. We coupled a mechanistic thorium sorption and desorption model to a one-dimensional particle sinking model that uses realistic particle settling velocity spectra. The model generates estimates of 238U-234Th disequilibrium, particulate organic carbon concentration, and the C:234Th ratio of sinking particles, which are then compared to in situ measurements from quasi-Lagrangian studies conducted on six cruises in the California Current Ecosystem. Broad patterns observed in in situ measurements, including decreasing C:234Th ratios with depth and a strong correlation between sinking C:234Th and the ratio of vertically-integrated particulate organic carbon (POC) to vertically-integrated total water column 234Th, were accurately recovered by models assuming either a power law distribution of sinking speeds or a double log normal distribution of sinking speeds. Simulations suggested that the observed decrease in C:234Th with depth may be driven by preferential remineralization of carbon by particle-attached microbes. However, an alternate model structure featuring complete consumption and/or disaggregation of particles by mesozooplankton (e.g. no preferential remineralization of carbon) was also able to simulate decreasing C:234Th with depth (although the decrease was weaker), driven by 234Th adsorption onto slowly sinking particles. Model results also suggest that during bloom decays C:234Th ratios of sinking particles should be higher than expected (based on contemporaneous water column POC), because high settling velocities minimize carbon remineralization during sinking.

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