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OALib Journal期刊
ISSN: 2333-9721
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南极冰盖边缘近250年来气温变化的地域分布特征
DOI: 10.11821/xb200301010, PP. 83-89
Keywords: 南极,冰芯,气温,地形,环南极波,绕极流
Abstract:
通过对南极冰盖边缘17支浅冰芯氧同位素的对比研究，揭示了整个南极冰盖边缘近50年来、150年来和250年来气温变化的地域分布特征。近50年来，南极冰盖边缘的氧同位素温度有的呈现上升趋势，有的呈现下降趋势，但气温变化的地域规律性不强；近150年来，南极冰盖边缘的同位素温度的升高和降低趋势大致呈现出一种交替分布的态势；近250年来，南极冰盖边缘所有的氧同位素温度都记录了小冰期的降温事件。气温的这种地域分布特征可能是南大洋独特的环流形式——环南极波(ACW)——在特殊地形(如大的冰盆)影响下，在南极冰盖边缘的表现形式，并且随着时间尺度的不同，南大洋独特的环流形式、ACW和地形的影响强度各异。
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