EXTRACTION OF AIR BUBBLES IN ANTARCTIC ICE CORE SAMPLES AND DETERMINATION OF METHANE CONCENTRATION
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概要
- 論文の詳細を見る
In the polar region, during the process of snow-firn-ice transition, the air in the snow is isolated from the atmosphere and enclosed in the ice as bubbles. The trapped air is expected to contain trace gases which represent the atmospheric concentrations at the time of ice formation. In order to study the change of the chemical state of the atmosphere and the climate in the past, we have initiated the analysis of trace gases in Antarctic deep ice core samples. An ice core sample was cut into several pieces after the removal of surface layer (1cm) in the cold room at -20℃ in NIPR. About 100g of ice was placed in a greaseless glass flask which was sealed with a Viton O-ring and equipped with a glass-Teflon valve. The flask was first evacuated with the ice kept at dry ice temperature, then the valve was closed and the ice was thawed. After shaking the flask, the thawed water was refrozen quickly at liquid nitrogen temperature, leaving the dissolved air and trace gases (at equilibria at 0℃) trapped in the ice. The released air was dried by passing through a cold trap at -100℃ and transferred into a preevacuated stainless steel sample loop or small flask by using an all-stainless steel bellows pump. The extracted gas was analyzed with a gas chromatograph equipped with a flame ionization detector for methane and a mass spectrometer for other gases. The correction was made for the unavoidable and reproducible contamination of trace amount methane from the stainless steel bellows in the pump. The amount of air and trace gases remaining in the refrozen ice was also taken into account. The averaged methane concentration in the ice core drilled in 1984 at Mizuho Station, was found to be 0.75±0.02 ppmv at 330m depth, which has been estimated to be about 3600 years old. This value is less than half of the present atmospheric concentration observed at Syowa Station in Antarctica. Since a number of horizontal cracks are found in the core samples, we are trying to estimate the effect of modern air contamination after the drilling by means of analyzing other components in the bubbles.
- 国立極地研究所の論文
著者
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Fujii Yoshiyuki
National Institute of Polar Research, Research Organization of Information and Systems
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Fujii Yoshiyuki
National Institute Of Polar Research
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MAKIDE Yoshihiro
Radioisotope Center, The University of Tokyo
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TOMINAGA Takeshi
Department of Chemistry, Faculty of Science, The University of Tokyo
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TOHJIMA Yasunori
Department of Chemistry, Faculty of Science, University of Tokyo
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Tohjima Yasunori
Laboratory For Earthquake Chemistry Faculty Of Science The University Of Tokyo
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Makide Yoshihiro
Radioisotope Center The University Of Tokyo
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Tominaga Takeshi
Department Of Chemistry Faculty Of Science The University Of Tokyo
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Tohjima Y
Univ. Tokyo Tokyo Jpn
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Makide Yoshihiro
Radioisotope Center The Univ. Of Tokyo
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Tohjima Yasunori
Department of Chemistry, Faculty of Science, The University of Tokyo
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- Glaciological Research at Mizuho Station, Antarctica in 1977
- Glaciological research in Hidden Valley, Mukut Himal in 1994
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- Cosmic spherules in bare ice near the Allan Hills, Victoria Land, Antarctica (extended abstract)
- GLACIOLOGICAL RESEARCH PROGRAM IN EAST QUEEN MAUD LAND, EAST ANTARCTICA PART 4,1984
- METEOROLOGICAL DATA AT MIZUHO STATION, ANTARCTICA IN 1984
- SEASONAL CHANGES OF LOW MOLECULAR WEIGHT DICARBOXYLIC ACIDS IN SNOW SAMPLES FROM DOME FUJI STATION, ANTARCTICA
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- Preface
- Glaciological Data Collected by the 30th, 31st and 32nd Japanese Antarctic Research Expeditions in 1989-1991
- 5. Surface Meteorological Data during Oversnow Traverses(Glaciological Data Collected by the 37th Japanese Antarctic Research Expedition during 1996-1997)
- 4. Snow Temperature Data at Dome Fuji Station(Glaciological Data Collected by the 37th Japanese Antarctic Research Expedition during 1996-1997)
- 3. Surface Snow Density around Dome Fuji Station(Glaciological Data Collected by the 37th Japanese Antarctic Research Expedition during 1996-1997)
- 2. Net Accumulation of Snow at Dome Fuji Station(Glaciological Data Collected by the 37th Japanese Antarctic Research Expedition during 1996-1997)
- 1. Outline of Field Observations during 1996-1997(Glaciological Data Collected by the 37th Japanese Antarctic Research Expedition during 1996-1997)
- Geomorphological and glaciological aspects around the highest dome in Queen Maud Land, East Antarctica
- Neutron activation analysis of spherules from bare ice near the Allan Hills and an ice core from Mizuho Station (abstract)
- Instrumental neutron activation analyses of the spherules from the Mizuho ice core (abstract)
- Semiannual Variation of Microparticle Concentration in Snow Drift at Mizuho Station, Antarctica in 1977
- Seasonal variation of pH values in snow at Halley Base and Mizuho Station, Antarctica (abstract)
- Seasonal variation of oxygen isotopic composition of drifting snow at Mizuho Station, East Antarctica (abstract)
- Past 30-year pH record in a firm core from the Brust Ice Shelf, Antarctica, and its relationship to volcanic events
- Formation of Surface Snow Layer at Mizuho Station, Antarctica
- Comparison of the Seasonal Meteorological Variations between Mizuho and Syowa Stations, Antarctica in 1977
- Determination of Methane Concentration in Air Extracted from Antarctic Ice Core Samples.
- Observation of Snow Particles at Hidden Valley, Mukut Himal:Glaciological Expedition of Nepal, Contribution No. 50
- Preliminary Investigations of Sediment Core Samples from the Tsola-Tso Lake, Khumbu Himal:Glaciological Expedition of Nepal, Contribution No. 77