Extreme fractionation of gases caused by formation of clathrate hydrates in Vostok Antarctic Ice

Ikeda, Tomoko; Fukazawa, Hiroshi; Mae, Shinji; Pépin, Laurence; Duval, Paul; Champagnon, B.; Lipenkov, V. Ya.; Hondoh, Takeo

doi:10.1029/1998gl900220

Cited by 84 publications

(98 citation statements)

References 23 publications

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“…An important clue about the cause of this decrease in number of air inclusions is the accompanying increase in the spatial variability of their volume concentrations (dv i /v), as shown in Figure 3f. Both findings can be explained by assuming that some air bubbles completely disappear due to the gas outflow toward the coexisting hydrates [Ikeda et al, 1999;Ikeda-Fukazawa et al, 2001].…”

Section: Discussionmentioning

confidence: 99%

“…These observations suggest active hydrate growth during the transition. The flux of air from coexisting bubbles [Ikeda et al, 1999;Ikeda-Fukazawa et al, 2001] likely sustains their growth and also produces facets [Hondoh, 1996].…”

Section: Discussionmentioning

confidence: 99%

“…These facts are explained by sluggish hydrate nucleation [Shoji and Langway, 1987;Hondoh, 1996] and quick postnucleation conversion [Salamatin et al, 1998]. Ikeda et al [1999] and Ikeda-Fukazawa et al [2001] found that extreme fractionation of gases in air inclusions occurs in the transition zone and interpreted this fact as selective diffusive fluxes of N 2 and O 2 from bubbles to hydrates through the ice matrix.…”

Section: Introductionmentioning

confidence: 99%

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Air bubble to clathrate hydrate transformation in polar ice sheets: A reconsideration based on the new data from Dome Fuji ice core

Ohno

Lipenkov

Hondoh

2004

Geophysical Research Letters

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[1] Mapping the spatial distribution of air bubbles and clathrate hydrates in thick sections of Antarctic ice from Dome Fuji station reveals a considerable redistribution of the inclusions in terms of number and volume in the bubbleto-hydrate transition zone. Analysis of the data indicated that more than 10% of the hydrates nucleated outside the preceding bubbles and more than 30% of the bubbles completely expired due to the gas outflow toward the coexisting hydrates. These features of the gas-hydrate-ice nonequilibrium system are of major importance for modeling the global bubble-to-hydrate transformation in polar ice sheets and thus the results may help improve our ability to extract paleoclimatic information from air inclusions in ice cores.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Air bubble to clathrate hydrate transformation in polar ice sheets: A reconsideration based on the new data from Dome Fuji ice core

Ohno

Lipenkov

Hondoh

2004

Geophysical Research Letters

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“…3 The property of the QLL plays a key role in phenomena covering diverse fields of geophysics, astronomy, and biology. [4][5][6][7][8][9][10][11][12][13] In an endeavor to detect the state of water molecules in ice surface, we found that specific side chain 13 C labeled antifreeze proteins ͑AFPs͒ can be used as a sensor to detect water molecular reorientation ͑WMR͒ in the ice surface through 13 C spin lattice relaxation NMR experiments at temperatures below 0°C.…”

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confidence: 99%

Antifreeze protein NMR sensor to detect water molecular reorientation in the surface of ice

Mao

Lin

2009

The Journal of Chemical Physics

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The century-old puzzle of the existence of a quasiliquid layer in the surface of ice was revisited using ice-surface binding type I antifreeze proteins with specific side chain C13 labeled methyl groups. Variable temperature dependent C13 spin lattice relaxation NMR experiments were carried out below 0 °C to probe the water molecular reorientations surrounding the methyl groups. The result shows that water molecular reorientations in ice surface are much more dynamic than those in bulk ice. This study demonstrates that antifreeze proteins can be used as a sensor to detect the dynamics of water in the surface of ice.

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“…O atm are modified by À0.1% for a dO 2 /N 2 of +10% (J. Severinghaus, unpublished measurements in Antarctica and additional measurements performed outside of this work in Greenland, 2003 [Ikeda et al, 1999[Ikeda et al, , 2000a. Air hydrates are produced because of the pressure increase between 700 and 1300 m depth in GRIP.…”

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confidence: 99%

Evidence for stratigraphic distortion in the Greenland Ice Core Project (GRIP) ice core during Event 5e1 (120 kyr BP) from gas isotopes

et al. 2004

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[1] The disturbed stratigraphy of the ice in the lowest 10% of the Greenland GRIP ice core has been previously demonstrated using gas measurements (d 18 O of O 2 and CH 4 ) on a few meters depth scale. However, rapid ice isotopic variations (on the scale of 20 cm) are experienced in the bottom of the GRIP ice core with complex chemical signatures that make them difficult to reconcile with a disturbed stratigraphy of the ice. This is the case for event 5e1, first described as a dramatic cooling 120 kyr BP. We analyzed at a 5 cm resolution the isotopic composition of the air from 2 m of the GRIP bottom ice core covering event 5e1. The d 15 N measurements, combined with a basic firn modeling, lead to the solid conclusion that the rapid event 5e1 is not a climatic event.

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Extreme fractionation of gases caused by formation of clathrate hydrates in Vostok Antarctic Ice

Cited by 84 publications

References 23 publications

Air bubble to clathrate hydrate transformation in polar ice sheets: A reconsideration based on the new data from Dome Fuji ice core

Air bubble to clathrate hydrate transformation in polar ice sheets: A reconsideration based on the new data from Dome Fuji ice core

Antifreeze protein NMR sensor to detect water molecular reorientation in the surface of ice

Evidence for stratigraphic distortion in the Greenland Ice Core Project (GRIP) ice core during Event 5e1 (120 kyr BP) from gas isotopes

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