Aspects of climate variability in the North Atlantic sector: Discussion and relation to the Greenland Ice Sheet Project 2 high‐resolution isotopic signal
Aspects of climate variability in the North Atlantic sector: Discussion and relation to the Greenland Ice Sheet Project 2 high‐resolution isotopic signal
复制标题
北大西洋地区气候变化的各个方面：格陵兰冰盖项目 2 高分辨率同位素信号的讨论和关系
DOI：
10.1029/96jc02401
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发表时间：
1997
影响因子：
--
通讯作者：
R. Barry
中科院分区：
文献类型：
--
作者：
L. K. Barlow;J. Rogers;M. Serreze;R. Barry
本文综述了北大西洋地区可能影响格陵兰冰盖计划2 （GISP2）冰芯季节至年代际尺度同位素信号的气候变率方面。同位素信号的解释及其在季节水平上的空间适用性需要对天气尺度气候学进行研究。我们讨论了可能的气候影响：(1)到达GISP2站点的降水的可能来源区域，(2)北大西洋部分的气旋活动特征，以及(3)主要大气特征的变化，如平均海平面冰岛低压和亚速尔高压系统，北大西洋涛动和巴芬槽。接下来，我们评估了GISP2氘同位素信号与沿海温度和大气压力模式之间的相关性，从而得出高分辨率同位素记录的气候解释。GISP2站点受到东南的冰岛低压和西南和西部的戴维斯海峡/巴芬湾风暴的影响。北大西洋涛动通过西格陵兰岛和北欧之间冬季气温的跷跷板影响GISP2同位素信号。GISP2同位素偏移方向与东格陵兰岛和冰岛温度记录一致，与冬季巴芬槽位置不同有关，也与500 mbar净地转流异常有关。同位素偏移方向与大气变率之间的联系需要通过与其他格陵兰冰芯的额外季节数据集进行比较来进一步探讨。
This paper reviews aspects of climate variability in the North Atlantic sector that may influence the seasonal to decadal scale isotopic signal in the Greenland Ice Sheet Project 2 (GISP2) ice core. Interpretation of the isotopic signal and its spatial applicability at the seasonal level requires investigation into synoptic scale climatology. We discuss possible climatic influences of (1) likely source regions of precipitation reaching the GISP2 site, (2) the characteristics of cyclone activity over the North Atlantic sector, and (3) changes in major atmospheric features such as the mean sea level Icelandic Low and Azores High pressure systems, the North Atlantic Oscillation, and the Baffin trough. Next, we evaluate correlations between the GISP2 deuterium isotopic signal and coastal temperatures with atmospheric pressure patterns, thereby deriving climatic interpretations of the high-resolution isotopic record. The GISP2 site is influenced by both the Icelandic Low to the southeast and Davis Strait/Baffin Bay storms to the southwest and west. The North Atlantic Oscillation influences the GISP2 isotopic signal through the seesaw in winter temperatures between west Greenland and northern Europe. Agreement in excursion directions of GISP2 isotopes and east Greenland and Iceland temperature records is associated with different positions of the Baffin trough in winter and also with anomalous 500-mbar net geostrophic flow. Linkages between isotopic excursion direction and atmospheric variability need to be explored further by comparison with additional seasonal data sets from other Greenland ice cores.