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An Observationally Trained Markov Model for MJO Propagation
Geophysical research letters, 2021-12, Vol.49 (2)
[Peer Reviewed Journal]
ISSN: 0094-8276 ;EISSN: 1944-8007
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Title:
An Observationally Trained Markov Model for MJO Propagation
Author:
Hagos, Samson
;
Leung, L. Ruby
;
Zhang, Chidong
;
Balaguru, Karthik
Subjects:
ENVIRONMENTAL SCIENCES
Is Part Of:
Geophysical research letters, 2021-12, Vol.49 (2)
Description:
A Markovian stochastic model is developed for studying the propagation of the Madden-Julian Oscillation (MJO). This model represents the daily changes in real time multivariate MJO (RMM) indices as random functions of their current state and background conditions. The probability distribution function of the RMM changes is obtained using a machine learning algorithm trained to maximize MJO forecast skills using observed daily indices of RMM and different modes of variability. Skillful forecasts are obtained for lead times between 8 and 27 days. Large ensemble simulations by the stochastic model show that with monsoonal changes in the background state, MJO propagation across the Maritime Continent (MC) is most likely to be disrupted in boreal spring and summer when MJO events propagate from favorable conditions over the Indian Ocean to unfavorable ones over the MC, and predictability is higher during spring and summer when MJO activity is away from the MC region.
Publisher:
United States: American Geophysical Union (AGU)
Language:
English
Identifier:
ISSN: 0094-8276
EISSN: 1944-8007
Source:
Wiley Blackwell AGU Digital Library
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