A Stratigraphic Record of an Ice Core from the Yamato Meteorite Ice Field, Antarctica

Nakawo, Masayoshi; Nagoshi, Masayasu; Mae, Shinji

doi:10.3189/s0260305500004298

Cited by 8 publications

(6 citation statements)

References 8 publications

(8 reference statements)

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“…Work on bubble expansion from a 100 m core from South Yamato BIA (Nakawo et al . 1988) suggests that significant release of stress occurs even at 50 m depth, though no cracks were seen below 7 m depth. Relatively small upward velocities in BIAs of order 10 cm a -1 mean that ice is in the upper 10 m of the BIA for century periods of time.…”

Section: Dating Of Blue Icementioning

confidence: 99%

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Antarctic blue ice areas - towards extracting palaeoclimate information

Sinisalo¹,

Moore

2010

Antarctic Science

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Abstract:We review the current scientific knowledge about Antarctic Blue Ice Areas (BIAs) with emphasis on their application for palaeoclimate studies. Substantial progress has been made since the review by Bintanja (1999), in particular dating the archive of ancient ice found on the surface of BIAs has progressed with advances in 14 C measurements, tephrachronology, and geomorphological evidence giving better constraints to more sophisticated ice flow models. Flow modelling also provides information about past changes in ice flow velocities, accumulation rates and ice sheet elevation. The availability of gas composition in vertical cores from BIAs allows matching to well-dated global records of greenhouse gas variability over the last glacial-interglacial cycle and longer. It is clear from the limited number of studies to date that BIAs from different regions have quite different histories of formation and preservation, and that they are intimately linked to the response of their surrounding ice sheets to climate variability on glacial-interglacial time-scales. Looking to the future, climate records from BIAs are expected to provide information on variations in Southern Ocean processes as well as ice sheet evolution within the East Antarctic ice sheet at the thermal transition from cold based to warm based ice.

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Section: Dating Of Blue Icementioning

confidence: 99%

“…Palaeoclimate data have been collected from South Yamato (Nakawo et al . 1988, Machida et al . 1996, Moore et al .…”

Section: Antarctic Blue Ice Areas (Bias)mentioning

confidence: 99%

Antarctic blue ice areas - towards extracting palaeoclimate information

Sinisalo¹,

Moore

2010

Antarctic Science

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“…Each BIA record was also able to provide higher temporal resolution than usual in deep ice cores. The records from Scharffenbergbotnen (Sinisalo et al, 2007), South Yamato (Nakawo et al, 1988;Machida et al, 1996;Moore et al, 2006) and Mt. Moulton (Custer, 2006;Popp, 2008;Korotkikh et al, 2011) demonstrate that paleoclimate reconstructions from BIAs can be used to augment the already detailed ice-core record of past climate change, if robust age determination techniques are employed.…”

Section: Introductionmentioning

confidence: 99%

Climate archives from 90 to 250 ka in horizontal and vertical ice cores from the Allan Hills Blue Ice Area, Antarctica

et al. 2013

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Terrestrial meteorite ages indicate that some ice at the Allan Hills blue ice area (AH BIA) may be as old as 2.2 Ma. As such, ice from the AH BIA could potentially be used to extend the ice core record of paleoclimate beyond 800 ka. We collected samples from 5 to 10 cm depth along a 5 km transect through the main icefield and drilled a 225 m ice core (S27) at the midpoint of the transect to develop the climate archive of the AH BIA. Stable water isotope measurements (δD) of the surface chips and of ice core S27 yield comparable signals, indicating that the climate record has not been significantly altered in the surface ice. Measurements of 40Aratm and δ18Oatm taken from ice core S27 and eight additional shallow ice cores constrain the age of the ice to approximately 90–250 ka. Our findings provide a framework around which future investigations of potentially older ice in the AH BIA could be based.

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“…We selected ten specimens from three sites on the Antarctic ice sheet at G15 Site (71ø21'S, 45ø59'E), Mizuho Station (70•41'S, 44ø19'E) [Narita et al, 1978], and the bare ice field of South Yamato Mountains (72ø05'S, 35ø11'E) [Nakawo et al, 1988]. Table 1 shows the fundamental data of the observed ice specimens.…”

Section: Samplesmentioning

confidence: 99%

“…On the other hand, the South Yamato core was recovered from a site about 1 km away from a nunatak. It is assumed that this specimen is tens of thousands of years in age [Nakawo et al, 1988] and has been subjected to complex stress conditions.…”

Section: Samplesmentioning

confidence: 99%

Three‐dimensional observations of ice crystal characteristics in polar ice sheets

Nishida¹,

Narita²

1996

J. Geophys. Res.

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In ice core studies, mean crystal size is generally measured on a section image of an ice specimen. However, an ice crystal with a complex shape may appear as several cells on a section image; consequently, the mean crystal size may be underestimated by overcounting the crystals on the image. We examined this phenomenon, which we called duplication effect, through three-dimensional observation of crystal shapes. In terms of results, we found that the frequency in which duplicate cells appear on a section image is linear with respect to the frequency of which randomly drawn lines on the image pass a cell more than once. On the basis of this empirical relationship, the error on the mean crystal size caused by the duplication effect can be revised from the section image itself. As to its application, we examined crystal sizes in some Antarctic ice specimens and found that the extent of change of crystal size steadily increased with depth up to 100 m and then fluctuated between 6% and 10% in the deeper pans.

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A Stratigraphic Record of an Ice Core from the Yamato Meteorite Ice Field, Antarctica

Cited by 8 publications

References 8 publications

Antarctic blue ice areas - towards extracting palaeoclimate information

Antarctic blue ice areas - towards extracting palaeoclimate information

Climate archives from 90 to 250 ka in horizontal and vertical ice cores from the Allan Hills Blue Ice Area, Antarctica

Three‐dimensional observations of ice crystal characteristics in polar ice sheets

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