Climatology and decadal changes of Arctic atmospheric rivers based on ERA5 and MERRA-2
Climatology and decadal changes of Arctic atmospheric rivers based on ERA5 and MERRA-2
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基于ERA5和MERRA-2的北极大气河流气候学和年代际变化
DOI：
10.1088/2752-5295/acdf0f
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Cleveland, William S
中科院分区：
文献类型：
--
作者：
Zhang, Chen;Tung, Wen-wen;Cleveland, William S
我们根据1980-2019年ERA 5和MERRA-2再分析得出的12组标签，提出了北极大气河流（AR）气候学。AR的识别和跟踪的3小时再分析数据的多因子方法的基础上，无论是大气柱集成水汽（IWV）或集成水汽输送（IVT）超过三个气候阈值（第75，第85，和第95个月）之一。AR标签中AR事件计数的时间序列分析显示，从20世纪90年代中期到2019年，总体呈上升趋势。第75个基于IVT和IWV的标签，以及第85个基于IWV的标签，可能对北极表面变暖更敏感，因此，随着时间的推移，检测到AR影响区域的一些扩大，而其余的标签没有。对这些标签的空间探索性分析表明，AR发生频率最大值从1980-1999年的陆地转移到2000-2019年的北冰洋及其远海。横跨大西洋，北极，太平洋地区的AR发生率，表面温度和柱集成水分的趋势较高。与此同时，人工呼吸系统对越来越多的水分输送到北极负有越来越大的责任。尽管北极AR发生率的增加主要与长期的北极表面变暖和湿润有关，但大气环流变化的影响可能在局部地区突出，例如在楚科奇海的太平洋一侧。遥相关模式的变化强烈地调制了AR活动的时间和空间，在最近十年中，在北极-太平洋部门的显着异常。此外，由第95百分位数标签识别的极端事件显示出最显著的变化，最受遥相关模式的影响。地图集中的12个北极AR标签和详细的图形可以帮助导航检测和量化北极AR及其相关影响的不确定性。
We present the Arctic atmospheric river (AR) climatology based on twelve sets of labels derived from ERA5 and MERRA-2 reanalyses for 1980–2019. The ARs were identified and tracked in the 3-hourly reanalysis data with a multifactorial approach based on either atmospheric column-integrated water vapor (IWV) or integrated water vapor transport (IVT) exceeding one of the three climate thresholds (75th, 85th, and 95th percentiles). Time series analysis of the AR event counts from the AR labels showed overall upward trends from the mid-1990s to 2019. The 75th IVT-and IWV-based labels, as well as the 85th IWV-based labels, are likely more sensitive to Arctic surface warming, therefore, detected some broadening of AR-affected areas over time, while the rest of the labels did not. Spatial exploratory analysis of these labels revealed that the AR frequency of occurrence maxima shifted poleward from over-land in 1980–1999 to over the Arctic Ocean and its outlying Seas in 2000–2019. Regions across the Atlantic, the Arctic, to the Pacific Oceans trended higher AR occurrence, surface temperature, and column-integrated moisture. Meanwhile, ARs were increasingly responsible for the rising moisture transport into the Arctic. Even though the increase of Arctic AR occurrence was primarily associated with long-term Arctic surface warming and moistening, the effects of changing atmospheric circulation could stand out locally, such as on the Pacific side over the Chukchi Sea. The changing teleconnection patterns strongly modulated AR activities in time and space, with prominent anomalies in the Arctic-Pacific sector during the latest decade. Besides, the extreme events identified by the 95th-percentile labels displayed the most significant changes and were most influenced by the teleconnection patterns. The twelve Arctic AR labels and the detailed graphics in the atlas can help navigate the uncertainty of detecting and quantifying Arctic ARs and their associated effects in current and future studies.
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影响因子：
5.2
作者：
J. Liang;L. Sushama
通讯作者：
J. Liang;L. Sushama
大气河流在温带和极地水文气候中的作用
DOI：
10.1029/2017jd028130
发表时间：
2018
期刊：
Journal of Geophysical Research: Atmospheres
影响因子：
--
作者：
D. Nash;D. Waliser;B. Guan;H. Ye;F. Ralph
通讯作者：
F. Ralph
影响因子：
5.2
作者：
E. Johansson;A. Devasthale;M. Tjernström;A. Ekman;T. L’Ecuyer
通讯作者：
T. L’Ecuyer
影响因子：
5.2
作者：
M. Winton
通讯作者：
M. Winton
影响因子：
5.2
作者：
Guan, Bin;Waliser, Duane E.;Neiman, Paul J.
通讯作者：
Neiman, Paul J.