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Climate of the Past An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/cp-2019-92
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/cp-2019-92
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 15 Aug 2019

Submitted as: research article | 15 Aug 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Climate of the Past (CP).

Distorted Pacific-North American Teleconnection at the Last Glacial Maximum

Yongyun Hu1, Yan Xia1, Zhengyu Liu1,2, Yuchen Wang1, Zhengyao Lu1, and Tao Wang3 Yongyun Hu et al.
  • 1Laboratory for Climate and Ocean-Atmosphere Studies, Department of Atmospheric and Oceanic Sciences, School of Physics, Peking University, Beijing 100871, China
  • 2Atmospheric Science Program, Department of Geography, Ohio State University, Columbus, OH, 43210, USA
  • 3Nansen-Zhu International Research Centre, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China

Abstract. The Pacific-North American (PNA) teleconnection is one of the most important climate modes in the present climate condition, and it enables climate variations in the tropical Pacific to exert significant impacts on North America. Here, we show climate simulations that the PNA teleconnection was largely distorted or broken at the Last Glacial Maximum (LGM). The distorted PNA is caused by a split of the westerly jet stream, which is ultimately forced by the thick and large Laurentide ice sheet at the LGM. Changes in the jet stream greatly alter the extratropical wave guide, distorting wave propagation from the North Pacific to North America. The distorted PNA suggests that climate variability in the tropical Pacific, notably, El Niño and Southern Oscillation (ENSO), would have little direct impact on North American climate at the LGM.

Yongyun Hu et al.
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Short summary
The paper shows in climate simulations that the Pacific-North-America (PNA) teleconnection was distorted or completely broken at the Last Glacial Maximum (LGM). It suggests that ENSO had little direct impact on North American climates at glacial climates.
The paper shows in climate simulations that the Pacific-North-America (PNA) teleconnection was...
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