南極ドームふじにおける1995年から2006年の表面質量収支の特徴

亀田, 貴雄; 本山, 秀明; 藤田, 秀二; 高橋, 修平

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The SMB was estimated using 36 bamboo stakes (grid of 6\u00d76, placed at 20m intervals). The heights of the stake tops from the snow surface were measured at 0.5cm resolution twice monthly in 1995, 1996, 1997, and 2003, and once a year for the rest of the study period. The annual SMB from 1995 to 2006 at Dome Fuji was 27.3\u00b11.5kgm^\u003c-2\u003ea^\u003c-1\u003e. This result agrees well with the annual SMB from AD 1260 to 1993 (26.4kgm^\u003c-2\u003ea^\u003c-1\u003e), estimated from volcanic signals in the Dome Fuji ice core. From 1995 to 2006, there were 37 incidences of negative or zero annual SMB, which was 8.6%. Compared with similar studies at Vostok, South Pole and Dome C, we found that a site with SMB over 190kgm^\u003c-2\u003ea^\u003c-1\u003e is expected to have annual snow accumulation at the 95% confidence level. Sites from 1500 to 2500m above sea level fit the criteria on the Antarctic ice sheet. According to stake and snow pit observations at Vostok, we estimated that the probability of an annual layer missing (hiatus) at Dome Fuji under present-day and glacial conditions are 9.4% and 11.4%, respectively. 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南極ドームふじにおける1995年から2006年の表面質量収支の特徴

https://kitami-it.repo.nii.ac.jp/records/7654

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学術雑誌論文 / Journal Article(1)

公開日

2014-08-19

タイトル

南極ドームふじにおける1995年から2006年の表面質量収支の特徴

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jpn

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http://purl.org/coar/resource_type/c_6501

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journal article

その他のタイトル

Outline of surface mass balance at Dome Fuji, East Antarctica, by the stake method from 1995 to 2006

著者

亀田, 貴雄

WEKO 44128
NRID 1000000233974

	亀田, 貴雄

著者別名

識別子

39209

識別子Scheme

WEKO

姓名

Kameda, Takao

著者別名

識別子

39210

識別子Scheme

WEKO

姓名

Takahashi, syuhei

抄録

内容記述タイプ

Abstract

内容記述

1995年1月25日に南極ドームふじに36本雪尺(20m間隔で100m×100m)が第36次南極地域観測隊により設置され,それ以来雪尺の高さが継続的に測定されてきた.ドームふじ基地で越冬観測を実施した4年間(1995年1月から1997年12月及び2003年1月から2004年1月)は月2回測定し,それ以外は年1回の測定(1月上旬が多い)を実施した.この結果,1995年から2006年までのドームふじの年平均表面質量収支は,27.3±1.5kgm^<-2>a^<-1> であることが推定できた.これは,ドームふじ浅層コアから推定された西暦1260年から1993年までの平均値(26.4kgm^<-2>a^<-1>)と近い値であった.また,ドームふじでは1年後に雪尺の高さが等しいかもしくは高くなっている「負の年間表面質量収支」が8.6%の確率で起こっていることがわかった.南極内陸に位置するボストーク,南極点,ドームCでの同様な観測結果と比較することにより,負の年間表面質量収支は年平均表面質量収支の増加とともに減少し,190kgm^<-2>a^<-1> 以上の地点ではで負の年間表面質量収支は95%の信頼水準で起こらず,正の年平均表面質量収支が期待できることがわかった.190kgm^<-2>a^<-1> 以上の年平均表面質量収支は地域により異なるが,現在の南極氷床ではおおよそ標高1500-2500mに相当するので,この標高域では毎年の積雪が氷床に記録されている地点が多いことが推定できた.一方,ボストークでのピット観測結果を参考にして,現在及び氷期のドームふじコアでの年層欠損確率をそれぞれ9.4%,11.4% と見積もった.この他に,ドームふじで1本の雪尺を1年間観測した時に得られる年平均表面質量収支の誤差,10年後の再測定で得られる年平均表面質量収支の誤差などを論じた.
\nThis paper describes observational results of surface mass balance (SMB) at Dome Fuji (77°19'01″S, 39°42'11″E; 3810m a.s.l.), East Antarctica from 1995 to 2006. The SMB was estimated using 36 bamboo stakes (grid of 6×6, placed at 20m intervals). The heights of the stake tops from the snow surface were measured at 0.5cm resolution twice monthly in 1995, 1996, 1997, and 2003, and once a year for the rest of the study period. The annual SMB from 1995 to 2006 at Dome Fuji was 27.3±1.5kgm^<-2>a^<-1>. This result agrees well with the annual SMB from AD 1260 to 1993 (26.4kgm^<-2>a^<-1>), estimated from volcanic signals in the Dome Fuji ice core. From 1995 to 2006, there were 37 incidences of negative or zero annual SMB, which was 8.6%. Compared with similar studies at Vostok, South Pole and Dome C, we found that a site with SMB over 190kgm^<-2>a^<-1> is expected to have annual snow accumulation at the 95% confidence level. Sites from 1500 to 2500m above sea level fit the criteria on the Antarctic ice sheet. According to stake and snow pit observations at Vostok, we estimated that the probability of an annual layer missing (hiatus) at Dome Fuji under present-day and glacial conditions are 9.4% and 11.4%, respectively. Variations of SMB measured by 36-stakes for 12 years were also analyzed.

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南極資料

巻 52, 号特集号, p. 151-158, 発行日 2008-06

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国立極地研究所

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南極ドームふじにおける1995年から2006年の表面質量収支の特徴

× 亀田, 貴雄

× 本山, 秀明

× 藤田, 秀二

× 高橋, 修平

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