Spatially coherent late Holocene Antarctic Peninsula surface air temperature variability
Spatially coherent late Holocene Antarctic Peninsula surface air temperature variability
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DOI：
10.1130/g45347.1
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发表时间：
2018-12-01
期刊：
影响因子：
5.8
通讯作者：
Griffiths, Howard
中科院分区：
文献类型：
--
作者：
Charman, Dan J.;Amesbury, Matthew J.;Griffiths, Howard
南极半岛在20世纪后半叶经历了区域温度的快速上升，但对数百年温度变化的区域模式及其动力驱动因素仍然知之甚少。在这里，我们使用代理的生物生产力在罕见的，深苔藓银行推断过去的表面空气温度变化的南极半岛，并确定这些变化的驱动因素。晚全新世温度之间的低海拔苔藓银行记录和高海拔冰芯网站大致一致，我们的结论是西风带的强度变化，与南部环形模式，是最有可能的驱动程序。我们的数据不支持假设的持续温度偶极子在南极半岛有关的厄尔尼诺南方涛动的强烈影响。世纪半岛生物生产力的变化率在晚全新世的背景下是不寻常的，进一步变暖将推动苔藓生长和微生物种群的快速增长。
The Antarctic Peninsula experienced a rapid rise in regional temperature during the second half of the 20th century, but the regional pattern of multi-centennial temperature changes and their dynamical drivers remain poorly understood. Here we use proxies of biological productivity in rare, deep moss banks to infer past surface air temperature changes on the Antarctic Peninsula and identify the drivers of these changes. Late Holocene temperatures are broadly consistent between the low-elevation moss bank records and a high-elevation ice core site, and we conclude that variation in the strength of the westerlies, linked to the Southern Annular Mode, is the most likely driver. Our data do not support a hypothesized persistent temperature dipole over the Antarctic Peninsula related to a strong influence of El Nino-Southern Oscillation. Rates of change in biological productivity on the peninsula over the 20th century are unusual in the context of the late Holocene, and further warming will drive rapid future increases in moss growth and microbial populations.