Multidecadal seesaw in cold wave frequency between central Eurasia and Greenland and its relation to the Atlantic Multidecadal Oscillation
Multidecadal seesaw in cold wave frequency between central Eurasia and Greenland and its relation to the Atlantic Multidecadal Oscillation
复制标题
欧亚大陆中部和格陵兰岛寒潮频率的数十年跷跷板及其与大西洋数十年涛动的关系
DOI：
10.1007/s00382-021-05967-7
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发表时间：
2021-09-30
期刊：
影响因子：
4.6
通讯作者：
Shi, Zhen
中科院分区：
文献类型：
--
作者：
Liu, Yusen;Sun, Cheng;Shi, Zhen
在冬季，中高纬度的冷浪活动对农业，经济和人类福祉产生了深远的影响。这种极端的天气事件与东亚冬季季风系统有关，并显着影响欧亚大陆上的气候。然而，北半球的冷波活性的多年差异和区域互连鲜为人知。在这项研究中，我们研究了冷波频率（CWF）的多年代变化，并找到格陵兰与欧亚大陆中部之间的逆关系。观察性和建模证据表明，大西洋多年代振荡（AMO）可能是CWF中多年seesaw的驱动力，而北极海冰的影响非常有限。与AMO相关的海面温度（SST）升高会使对流层的亚极性温暖，并在中高纬度上削弱了主要的西风，从而导致亚极区域上的地理位置高度异常。这进一步削弱了冰岛人的低谷，并增强了西伯利亚高潮，这直接引起了格陵兰岛（欧亚大陆中部）的变暖（冷却）。平均表面空气温度和极端温度的平均状态之间存在很强的连贯性。格陵兰岛/欧亚大陆中部的AMO引起的变暖/冷却与较少/更频繁的冷浪活动相对应。我们的结果为冷浪活动的多年代变异性提供了新的见解，并表明北半球的CWF可能会相互联系。
During the winter, the cold wave activity over the mid-high latitudes has profound impacts on agriculture, economic and human wellbeing. Such extreme weather events have been connected with the East Asia winter monsoon system and significantly influence the climate over the Eurasian continent. However, the multidecadal variabilities and regional interconnections of the cold wave activity across the Northern Hemisphere are lesser-known. In this study, we investigate the multidecadal variations in the cold wave frequency (CWF) and find an inverse relationship between Greenland and central Eurasia. Observational and modeling evidence suggests that the Atlantic Multidecadal Oscillation (AMO) is likely to be the driving force of the multidecadal seesaw in CWF, while the effects of the Arctic sea ice are very limited. The increased sea surface temperature (SST) in association with the AMO warms the subpolar troposphere and weakens the predominant westerlies over mid-high latitudes, resulting in positive geopotential height anomalies over the subpolar region. This further weakens the Icelandic Low and strengthens the Siberian High, which directly induces the warming (cooling) over Greenland (central Eurasia). There is a strong coherence between the mean state of surface air temperature and temperature extremes. The AMO-induced warming/cooling in Greenland/central Eurasia corresponds well with less/more frequent cold wave activities. Our results provide new insight into the multidecadal variability of cold wave activities and suggest that the CWF in the Northern Hemisphere may be interlinked.