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Combined Effect of the Madden-Julian Oscillation and Arctic Oscillation on Cold Temperature Over Asia

Title
Combined Effect of the Madden-Julian Oscillation and Arctic Oscillation on Cold Temperature Over Asia
Author
박효석
Keywords
The madden-Julian oscillation; The Arctic oscillation; Extreme cold event; Combined effect; Thermodynamic budget equation
Issue Date
2019-02
Publisher
KOREAN METEOROLOGICAL SOC
Citation
ASIA-PACIFIC JOURNAL OF ATMOSPHERIC SCIENCES, v. 55, No. 1, Page. 75-89
Abstract
The combined effect of the Madden-Julian oscillation (MJO) and Arctic oscillation (AO) on the temperature variation over Asia is investigated using the thermodynamic budget equation. Because of the distinct geographical origin of the two atmospheric modes, the influence of AO is more dominant in the higher latitude, whereas the MJO impact is more predominant in the lower latitude. Hence, the physical process responsible for the surface cold anomaly is different for northern and southern Asia. Cold anomaly appears in most of Asia 20-25days after the MJO phase 6 (corresponding to the phase 2-3). However, more strengthened cold anomaly occurs over northern Asia under the negative AO state and it is caused by advection of temperature anomaly by climatological northerly wind associated with the East Asia winter monsoon flow. On the other hand, much stronger cold anomaly is seen over southern Asia under the positive AO state for the same lag day of the initial MJO phase 6. Aside from the upward overturning circulation forced by the tropical MJO over the subtropics and lower midlatitudes, the weakening of the East Asia subtropical jet by the positive AO induces additional upward motion over southern Asia to adjust the thermal wind balance. The combined effect of the MJO and AO also influences on the occurrence of extreme cold event. Under the negative (positive) AO phase, the extreme cold event occurrence probability over northern (southern) Asia increases by 90% (60%) compared to that for all winter days. The relative increase rate for the MJO phases 2-3 is similar to 30% over southern Asia. The cold event occurrence probability for the combined modes is about the twice that for only MJO impact, suggesting that an incorporation of both modes enhance the predictability of extreme cold event.
URI
https://link.springer.com/article/10.1007%2Fs13143-018-0091-2http://repository.hanyang.ac.kr/handle/20.500.11754/112456
ISSN
1976-7633; 1976-7951
DOI
10.1007/s13143-018-0091-2
Appears in Collections:
COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > MARINE SCIENCE AND CONVERGENCE ENGINEERING(해양융합공학과) > Articles
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