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Air–Sea Coupling Enhances the east asian winter climate Response to the Atlantic Multidecadal Oscillation

Advances in Atmospheric Sciences 2015年第12期32卷 1647-1659页

作者： ZHOU Xiaomin LI Shuanglin LUO Feifei GAO Yongqi Tore FUREVIK Nansen-Zhu International Research Centre and climate Change Research Center Institute of Atmospheric PhysicsChinese Academy of Sciences Joint Center for Global Change Studies University of Chinese Academy of Sciences Geophysical Institute and Bjerknes Center for climate Research University of Bergen

A simple air-sea coupled model, the atmospheric general circulation model （AGCM） of the National Centers for Environmental Prediction coupled to a mixed-layer slab ocean model, is employed to investigate the impact of air-sea coupling on the signals of the Atlantic Multidecadal Oscillation （AMO）. A regional coupling strategy is applied, in which coupling is switched off in the extratropical North Atlantic Ocean but switched on in the open oceans elsewhere. The coupled model is forced with warm-phase AMO SST anomalies, and the modeled responses are compared with those from parallel uncoupled AGCM experiments with the same SST forcing. The results suggest that the regionally coupled responses not only resemble the AGCM simulation, but also have a stronger intensity. In comparison, the coupled responses bear greater similarity to the observational composite anomaly. Thus, air-sea coupling enhances the responses of the east asian winter climate to the AMO. To determine the mechanism responsible for the coupling amplification, an additional set of AGCM experiments, forced with the AMO-induced tropical SST anomalies, is conducted. The SST anomalies are extracted from the simulated AMO-induced SST response in the regionally coupled model. The results suggest that the SST anomalies contribute to the coupling amplification. Thus, tropical air-sea coupling feedback tends to enhance the responses of the east asian winter climate to the AMO.

关键词： amplification Atlantic Multidecadal Oscillation air-sea coupling feedback east asian winter climate

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Modulation of the Arctic Oscillation and the east asian winter climate Relationships by the 11-year Solar Cycle

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Advances in Atmospheric Sciences 2012年第2期29卷 217-226页

作者：陈文周群 Center for Monsoon System Research Institute of Atmospheric PhysicsChinese Academy of Sciences

The modulation of the relationship between the Arctic Oscillation （AO） and the east asian winter climate by the 11-year solar cycle was investigated. During winters with high solar activity （HS）, robust warming appeared in northern Asia in a positive AO phase. This result corresponded to an enhanced anticyclonic flow at 850 hPa over northeastern Asia and a weakened east asian trough （EAT） at 500 hPa. However, during winters with low solar activity （LS）, both the surface warming and the intensities of the anticyclonic flow and the EAT were much less in the presence of a positive AO phase. The possible atmospheric processes for this 11-year solar-cycle modulation may be attributed to the indirect influence that solar activity induces in the structural changes of AO. During HS winters, the sea level pressure oscillation associated with the AO became stronger, with the significant influence of AO extending to east Asia. In the meantime, the AO-related zonal-mean zonal winds tended to extend more into the stratosphere during HS winters, which implies a stronger coupling to the stratosphere. These trends may have led to an enhanced AO phase difference; thus the associated east asian climate anomalies became larger and more significant. The situation tended to reverse during LS winters. Further analyses revealed that the relationship between the winter AO and surface-climate anomalies in the following spring is also modulated by the 11-year solar cycle, with significant signals appearing only during HS phases. Solar-cycle variation should be taken into consideration when the AO is used to predict winter and spring climate anomalies over east Asia.

关键词： AO east asian winter climate solar activity east asian trough

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