期刊
ADVANCES IN ATMOSPHERIC SCIENCES
卷 39, 期 4, 页码 625-642出版社
SCIENCE PRESS
DOI: 10.1007/s00376-021-1075-1
关键词
winter East Asian surface air temperature; North Atlantic Oscillation; Atlantic Multidecadal Oscillation; Africa-Asia multidecadal teleconnection pattern; coupled oceanic-atmospheric bridge; multidecadal variability
资金
- National Natural Science Foundation of China (NSFC) [41790474]
- Shandong Natural Science Foundation Project [ZR2019ZD12]
- Fundamental Research Funds for the Central Universities [201962009]
- Center for High Performance Computing and System Simulation
- Pilot National Laboratory for Marine Science and Technology (Qingdao)
This study investigates the influence of winter NAO on East Asian surface air temperature, finding a significant correlation and multi-decadal variability. The observed decreasing trend in winter EASAT in recent years suggests a high probability of extremely cold events in East Asia winters. The winter NAO leads the detrended winter EASAT by 12-18 years, with the most significant positive correlation at a lead time of 15 years.
In this paper, we investigate the influence of the winter NAO on the multidecadal variability of winter East Asian surface air temperature (EASAT) and EASAT decadal prediction. The observational analysis shows that the winter EASAT and East Asian minimum SAT (EAmSAT) display strong in-phase fluctuations and a significant 60-80-year multidecadal variability, apart from a long-term warming trend. The winter EASAT experienced a decreasing trend in the last two decades, which is consistent with the occurrence of extremely cold events in East Asia winters in recent years. The winter NAO leads the detrended winter EASAT by 12-18 years with the greatest significant positive correlation at the lead time of 15 years. Further analysis shows that ENSO may affect winter EASAT interannual variability, but does not affect the robust lead relationship between the winter NAO and EASAT. We present the coupled oceanic-atmospheric bridge (COAB) mechanism of the NAO influences on winter EASAT multidecadal variability through its accumulated delayed effect of similar to 15 years on the Atlantic Multidecadal Oscillation (AMO) and Africa-Asia multidecadal teleconnection (AAMT) pattern. An NAO-based linear model for predicting winter decadal EASAT is constructed on the principle of the COAB mechanism, with good hindcast performance. The winter EASAT for 2020-34 is predicted to keep on fluctuating downward until similar to 2025, implying a high probability of occurrence of extremely cold events in coming winters in East Asia, followed by a sudden turn towards sharp warming. The predicted 2020/21 winter EASAT is almost the same as the 2019/20 winter.
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