On the Differences and Climate Impacts of Early and Late Stratospheric Polar Vortex Breakup |
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Authors: | LI Lin LI Chongyin PAN Jing and TAN Yanke |
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Institution: | Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101,Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101, State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101 |
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Abstract: | The stratospheric polar vortex breakup (SPVB) is an
important phenomenon closely related to the seasonal transition of
stratospheric circulation. In
this paper, 62-year NCEP/NCAR reanalysis data were employed to investigate
the distinction between early and late SPVB. The results showed that the
anomalous circulation signals extending from the stratosphere to the
troposphere were reversed before and after early SPVB, while the
stratospheric signals were consistent before and after the onset of late
SPVB. Arctic Oscillation (AO) evolution during the life cycle of SPVB also
demonstrated that the negative AO signal can propagate downward after early
SPVB. Such downward AO signals could be identified in both geopotential
height and temperature anomalies. After the AO signal reached the lower
troposphere, it influenced the Aleutian Low and Siberian High in the
troposphere, leading to a weak winter monsoon and large-scale warming at mid
latitudes in Asia. Compared to early SPVB, downward propagation was not
evident in late SPVB. The high-latitude tropospheric circulation in the
Northern Hemisphere was affected by early SPVB, causing it to enter a summer
circulation pattern earlier than in late SPVB years. |
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Keywords: | stratospheric polar vortex breakup (SPVB) stratosphere-troposphere interaction Arctic Oscillation (AO) season transition |
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