Beryllium‐10 transport to Antarctica: Results from seasonally resolved observations and modeling
Beryllium‐10 transport to Antarctica: Results from seasonally resolved observations and modeling
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铍 10 向南极洲的运输：季节性观测和建模的结果
DOI：
10.1029/2011jd016530
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发表时间：
2011
影响因子：
--
通讯作者：
M. Curran
中科院分区：
文献类型：
--
作者：
J. Pedro;U. Heikkilä;A. Klekociuk;Andrew M. Smith;T. Ommen;M. Curran
在极地冰芯中测量的be在重建过去的太阳活动中有重要的应用。然而，控制其向冰盖的大气输送和沉积的过程尚不完全清楚。在这里，我们使用来自Law Dome站点（东南极洲）的10年月度冰芯记录中10Be浓度的季节变化，并结合ECHAM5-HAM环流模式（GCM）对10Be和7Be沉积的模拟，作为研究这个问题的工具。在南部夏末至初秋（夏-秋）期间，在冰芯中观测到最大的10Be浓度，而在南部冬季观测到最小的浓度。由Georg von Neumayer空气采样站对南极10Be:7Be比值的早期观测证实的GCM模拟表明，10Be浓度最大值与在南方夏秋季节从南极平流层直接输入到南极对流层低层的10Be有关。这一结果与模拟的10Be到格陵兰岛的输送形成对比，在那里平流层输入的季节性最大值出现在冬末到春季，与中纬度平流层到对流层交换的季节性最大值时间同步。我们的研究结果表明，10Be向南极和格陵兰冰盖的输送是由不同的过程组合造成的。
[1] Cosmogenic 10Be measured in polar ice cores has important application in the reconstruction of past solar activity. However, the processes controlling its atmospheric transport and deposition to the ice sheets are not fully understood. Here we use the seasonal changes in 10Be concentrations in a 10 year monthly resolved ice core record from the Law Dome site (East Antarctica) in conjunction with ECHAM5-HAM general circulation model (GCM) simulations of 10Be and 7Be deposition as tools to examine this problem. Maximum 10Be concentrations are observed in the ice core during the austral late summer to early autumn (summer-autumn), while minimum concentrations are observed during the austral winter. The GCM simulations, corroborated by earlier observations of 10Be:7Be ratios in Antarctica from the Georg von Neumayer air sampling station, suggest that the 10Be concentration maximum is linked to direct input of stratospheric 10Be from the Antarctic stratosphere to the lower levels of the Antarctic troposphere during the austral summer-autumn. This result contrasts with the modeled transport of 10Be to Greenland, where the seasonal maximum in stratospheric input is seen in the late winter to spring, synchronous with the timing of the seasonal maximum in midlatitude stratosphere to troposphere exchange. Our results suggest that a different combination of processes is responsible for the transport of 10Be to the Antarctic and Greenland ice sheets.
DOI：
10.1111/j.1600-0889.2011.00542.x
发表时间：
2011-01
期刊：
Tellus B: Chemical and Physical Meteorology
影响因子：
--
作者：
R. Weller;D. Wagenbach;M. Legrand;C. Elsässer;X. Tian-Kunze;G. König‐Langlo
通讯作者：
R. Weller;D. Wagenbach;M. Legrand;C. Elsässer;X. Tian-Kunze;G. König‐Langlo