Abstract
AbstractThis study investigates bidecadal variation and trends in the winter East Asian trough (EAT) intensity for the period from 1958 to 2020. The EAT intensity index, calculated with the JRA55 reanalysis, demonstrates bidecadal variation, which is closely related to the intensity of cold advection in East Asia that affects northeast China, the Korean Peninsula, and Japan. In addition, it is noted that the positive phase of the Arctic Oscillation (AO) plays an important role in suppressing EAT intensity, particularly on a bidecadal time scale. On the other hand, a warm anomaly in the west Pacific can enhance the intensity of the EAT, which is also reproduced by numerical simulation. The influence of a significant warming trend in the west Pacific and a weak positive trend in the AO on the EAT intensity and the East Asian winter monsoon is investigated. Warming in the west Pacific supports a strengthening of EAT intensity, cooling in northeast Asia, and enhancement of easterly wind in the subtropical west Pacific. A weak positive AO trend plays an insignificant role in affecting the trend of EAT intensity, but it supports warming in northeast Asia.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
