Advances in Earth Science ›› 2016, Vol. 31 ›› Issue (11): 1137-1150. doi: 10.11867/j.issn.1001-8166.2016.11.1137

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An Overview of Paleo-AO/NAO Studies

Wengui Liang( ), Xinyu Wen *( )   

  1. Laboratory of Climate, Ocean and Atmosphere Studies, Department of Atmospheric and Oceanic Science, School of Physics, Peking University, Beijing 100871, China
  • Received:2016-08-11 Revised:2016-10-20 Online:2016-11-20 Published:2016-11-20
  • Contact: Xinyu Wen;
  • About author:

    First author:Liang Wengui(1991-), male, Maoming City,Guangdong Province, Master student. Research areas include Paleoclimate and AO/

  • Supported by:
    Project supported by the National Natural Science Foundation of China “Towards the understanding of the transient climate evolution of the last 21 000 years”(No.41130105) and “Northeast Pacific wintertime wave train’s variability, dynamics, and its regional and global impacts on atmospheric circulation and climate changes”(No.41130962)

Wengui Liang, Xinyu Wen. An Overview of Paleo-AO/NAO Studies[J]. Advances in Earth Science, 2016, 31(11): 1137-1150.

The discovery of decadal variability of North Atlantic Oscillation (NAO) and the introduction of Arctic oscillation (AO) concept have initiated a series of paleo-AO/NAO related studies since the mid-to-late 1990s. The progress and new findings of paleo-AO/NAO works after that time were comprehensively reviewed. The new results from the observations and modelings at four key timescales were summarized in detail: ①the reconstructions of the AO/NAO annual index over the past millennium; ②the debate on AO/NAO’s trend since early Holocene; ③the weakening of AO/NAO’s amplitude during the Last Glacial Maximum; and ④the anomalous positive phase of AO/NAO during the Last Interglacial. In addition, the possible mechanism for different timescales of AO/NAO is also summarized. Furthermore, the distinction between AO/NAO’ was mean state and amplitude, which were not explicitly separated in previous studies, were comprehensively discussed. Considering the current uncertainties related to paleo-AO/NAO studies, we encourage the community to search for more proxies having longer-than-10,000-year length with annual resolution around AO/NAO highly correlated regions. Another, we encourage long-term transient modeling on AO/NAO can be performed in order to improve our understanding of the dynamics and interaction between AO/NAO’s high-frequency variability and the climatological background, so as to further improve AO/NAO’s predictability on global warming context.

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