What Configuration of the Atmospheric Circulation Drives Extreme Net and Total Moisture Transport Into the Arctic
What Configuration of the Atmospheric Circulation Drives Extreme Net and Total Moisture Transport Into the Arctic
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大气环流的什么结构驱动极端净和总水分输送到北极
DOI：
10.1029/2020gl089769
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发表时间：
2020
影响因子：
5.2
通讯作者：
E. Dunn‐Sigouin
中科院分区：
文献类型：
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作者：
L. Papritz;E. Dunn‐Sigouin
以前的工作强调了大气环流的不同配置，导致水汽输送到北极，并导致地表变暖。在这里，我们通过比较基于特征的天气系统诊断与再分析数据中纬向波数分解的水汽输送，阐明了导致纬向平均净和总水汽输送（向极地和向赤道的水汽输送绝对值之和）冬季极端事件的配置。结果表明，北极极端水汽输送事件可归因于个别天气系统，其中气旋有利于净输送，阻塞有利于总输送。纬向波数分解表明，净水汽输送主要受行星尺度（纬向波数k≤3）控制。两种诊断方法之间的比较表明，通过与气旋相互作用，而不是自身驱动运输，块状物对净运输的行星尺度贡献。最后，净和总水汽输送事件分别通过与气旋和阻塞相关的不同潜在过程导致北极地表变暖。
Previous work highlighted different configurations of the atmospheric circulation causing moisture transport into the Arctic and contributing to surface warming. Here, we clarify the configurations leading to extreme wintertime events of zonal‐mean net and total (sum of absolute values of poleward and equatorward) moisture transports by comparing feature‐based weather system diagnostics with zonal‐wavenumber decomposition of moisture transport in reanalysis data. Results show that extreme Arctic moisture transport events are attributable to individual weather systems, where cyclones favor net transport and blocks favor total transport. Zonal‐wavenumber decomposition reveals that net moisture transport is dominated by planetary scales (zonal‐wavenumbers k ≤ 3). Comparison between the two diagnostics suggests that blocks account for planetary scale contributions to net transport by interacting with cyclones rather than driving the transport themselves. Finally, net and total moisture transport events result in Arctic surface warming via different underlying processes related to cyclones and blocks, respectively.
影响因子：
5.2
作者：
Sukyoung Lee;C. Woods;R. Caballero
通讯作者：
Sukyoung Lee;C. Woods;R. Caballero