Why the continental margin around the Antarctica is deeper than other continental shelves ?

为什么南极洲周围的大陆边缘比其他大陆架更深？

• 批准号: 23501255
• 负责人: OKUNO Jun'ichi
• 金额: $ 2.91万
• 依托单位: National Institute of Polar Research
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2013
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23501255/
• 关键词: 南極氷床; 地形; 第四紀; 氷床変動; 地殻変動; 海水準変動; 地球変形; 南極; 大陸棚; 海底地形

The growth and decay history of Antarctic ice sheet affected geographic formation of the Antarctica including its margin through the Cenozoic era. The depth of the continental shelf around the Antarctica is very deep in comparison with that of the other sea areas in the world. The reason why continental shelf of Antarctica is very deep is that the Antarctic ice sheet would depress the continent including the continental shelf. Based on the glacial isostatic adjustment (GIA) modelling, we estimate the effect of the Antarctic ice load on the depth of the continental shelf around the Antarctica. GIA modelling results show that deformation due to the present ice distribution cannot satisfy the anomaly of the continental shelf depths in this region. However, the results based on the ice load model including the last glacial cycle explain the depth around the Antarctica, and imply that the Antarctic ice sheet extent to continental shelf at the Last Glacial Maximum.

南极冰盖的生长和衰减历史影响了整个新生代南极洲的地理形成，包括其边缘。与世界其他海域相比，南极大陆架的深度很深。南极大陆架之所以很深，是因为南极冰盖会挤压包括大陆架在内的大陆。基于冰川均衡调整（GIA）模型，估算了南极冰负荷对南极大陆架深度的影响。GIA模拟结果表明，由于目前的冰分布变形不能满足该地区的大陆架深度的异常。而基于末次冰期旋回的冰负荷模型的结果解释了南极洲周围的深度，并暗示在末次盛冰期南极冰盖延伸到大陆架。

项目成果

Mid-Holocene collapse of the East Antarctic Ice Sheet derived from near-field sea-level changes

近场海平面变化导致东南极冰盖在全新世中期崩塌

• 发表时间: 2011
• 作者: J.Okuno;H.Miura;H.Maemoku
• 通讯作者: H.Maemoku

人類が経験した最大の気候変動、10万年周期の氷期─間氷期サイクルのメカニズムを解明

阐明人类经历的最大规模气候变化10万年冰期-间冰期循环的机制

Vertical tectonic crustal movements along the Japanese coastlines inferred from late Quaternary and recent relative sea-level changes

• DOI: 10.1016/j.quascirev.2014.03.010
• 发表时间: 2014-05
• 期刊: Quaternary Science Reviews
• 影响因子: 4
• 作者: J. Okuno;M. Nakada;M. Ishii;H. Miura

Effect of glacial isostasy on the depth of Antarctic continental margin

冰川均衡对南极大陆边缘深度的影响

• 发表时间: 2012
• 作者: J.Okuno;H.Miura;Y.Nogi
• 通讯作者: Y.Nogi

南極大陸縁辺部における大陸棚深度に対する氷床変動の影響

冰盖变化对南极边缘大陆架深度的影响

• 发表时间: 2011
• 作者: Jun Yasuda;Katsuyuki Yaginuma;Yuriko Saiki;Yoshinobu Sugitani;Chikashi Obuse;Tetsuo Noda;黒木貴一・磯望;奥野淳一,三浦英樹,野木義史
• 通讯作者: 奥野淳一,三浦英樹,野木義史