Consistency and the Lack Thereof in Pacific Decadal Oscillation Impacts on North American Winter Climate
Consistency and the Lack Thereof in Pacific Decadal Oscillation Impacts on North American Winter Climate
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DOI：
10.1175/jcli-d-14-00143.1
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发表时间：
2014-09
影响因子：
4.9
通讯作者：
S. McAfee
中科院分区：
文献类型：
--
作者：
S. McAfee
本文在一个负的（~1943 ~ 1976）和一个正的（~ 1977 ~1990）太平洋年代际振荡（PDO）体制上初步评估了PDO对北美气候的影响。二十世纪世纪再分析的发表和最近出现的负PDO年使研究PDO遥相关的稳定性成为可能。该分析确定了大尺度遥相关模式的一致性，但也确定了PDO可比阶段之间环流模式、温度和降水异常幅度的关键差异。在控制了长期趋势和厄尔尼诺/南方涛动的影响之后，其中许多差异是明显的，并与大西洋温度和北方环形模式的变化有关。这项研究的结果表明，并不是所有的气候变率归因于PDO来自太平洋海面温度（SST）的波动，这些SST异常的气候影响随时间而变化，或者说，PDO的气候变化。
AbstractImpacts of the Pacific decadal oscillation (PDO) on North American climate were initially assessed over one negative (~1943 to 1976) and one positive (1977 to ~1990) PDO regime. Release of the Twentieth Century Reanalysis and the recent occurrence of negative PDO years make it possible to study the stability of PDO teleconnections. This analysis identified consistency in broad-scale teleconnection patterns but also critical differences in the amplitude of circulation pattern, temperature, and precipitation anomalies between comparable phases of the PDO. Many of these discrepancies were apparent after controlling for long-term trends and the impact of ENSO and were associated with variability in Atlantic Ocean temperatures and in the northern annular mode. Results from this study suggest that not all of the climate variability attributed to the PDO derives solely from fluctuations in Pacific sea surface temperatures (SSTs), that the climatic impact of these SST anomalies varies over time, or that t...