Decadal‐scale variability in long‐range atmospheric transport to the Summit of the Greenland Ice Sheet
Decadal‐scale variability in long‐range atmospheric transport to the Summit of the Greenland Ice Sheet
复制标题
到格陵兰冰盖顶峰的远程大气输送的十年尺度变化
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
Dewayne A. Martinez
中科院分区：
文献类型：
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作者：
J. Kahl;Jennifer A. Galbraith;Dewayne A. Martinez
从格陵兰冰原顶峰提取的冰芯可追溯到100 - 110千万年，并揭示了其化学和物理特征在几天到几千年的时间尺度上的波动。远程大气输送模式对空气和雪沉积化学物质的变异性都有很大贡献，因此是评估极地冰芯中保存的气候变异性的最重要考虑因素之一。在这里，我们通过对44年模拟的、每天到达格陵兰峰顶的10天空气轨迹的分析，提出了年代际尺度气候变率的新证据。特定逆风区域的轨迹停留时间显示出4 ~ 14年的年际振荡，并与3个气候遥相关指数相关。我们的研究结果表明，观测到的上游源区与大尺度气候振荡阶段之间的联系可以用于进一步了解古气候振荡。
Ice cores extracted from the Summit of the Greenland Ice Sheet date to >110 kyr b.p. and reveal fluctuations in chemical and physical characteristics on time scales ranging from days to millenia. Long‐range atmospheric transport patterns contribute substantially to variability in both airborne and snow‐deposited chemical species, and are thus one of the most important considerations in assessing climate variability preserved in polar ice cores. Here we present new evidence of decadal‐scale climate variability through an analysis of 44 years of modeled, 10‐day air trajectories arriving daily at Summit, Greenland. Trajectory residence times over specific upwind regions reveal interannual oscillations with periods of 4–14 years, and are correlated with three climate teleconnection indices. Our results suggest that the observed link between upstream source regions and the phases of large‐scale climate oscillations may be exploited to further understand paleoclimatic oscillations.