南极冰盖边缘近250年来气温变化的地域分布特征

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。

The Temperature Variations over the Antarctic Coastal Regions in the Past 250 Years

By comparing the oxygen isotope temperatures recorded by 1 7 shallow ice cores from the coastal regions of Antarctica, this paper presents the special characteristics of the temperature variations over t he Antarctic coastal regions in the past 50, 150 and 250 years. In the past 50 years, the isotopic temperatures recorded in the ice cores at differ ent sites of the Antarctic coastal regions differ great. For instance, although the increasing isotopic temperatures have been reported for many sites studied, some sites show decreasing trends. In the past 150 years, the isotope temperatures in the coastal regions of Antarctica show an al ternant-distributing pattern. In the past 250 years, all the ice cores f rom the coastal regions of Antarctica record the so-called Little Ice Age (L IA).