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摘要
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The Madden-Julian Oscillation ( MJO) is the dominant component of the intraseasonal ( 30-90 days) variability in the tropical atmosphere. It consists of large-scale coupled patterns in atmospheric circulation and deep convection, with coherent signals in many other variables, all propagating eastward slowly ( similar to 5 m s(-1)) through the portion of the Indian and Pacific oceans where the sea surface is warm. It constantly interacts with the underlying ocean and influences many weather and climate systems. The past decade has witnessed an expeditious progress in the study of the MJO: Its large-scale and multiscale structures are better described, its scale interaction is recognized, its broad influences on tropical and extratropical weather and climate are increasingly appreciated, and its mechanisms for disturbing the ocean are further comprehended. Yet we are facing great difficulties in accurately simulating and predicting the MJO using sophisticated global weather forecast and climate models, and we are unable to explain such difficulties based on existing theories of the MJO. It is fair to say that the MJO remains an unmet challenge to our understanding of the tropical atmosphere and to our ability to simulate and predict its variability. This review, motivated by both the acceleration and gaps in our knowledge of the MJO, intends to synthesize what we currently know and what we do not know on selected topics: its observed basic characteristics, mechanisms, numerical modeling, air-sea interaction, and influences on the El Nino and Southern Oscillation.
Keyword:
SEA-SURFACE TEMPERATURE
WESTERN EQUATORIAL PACIFIC
TROPICAL INTRASEASONAL OSCILLATIONS
GENERAL-CIRCULATION MODEL
UPPER-OCEAN HEAT
OUTGOING LONGWAVE RADIATION
1997-98 EL-NINO
ATMOSPHERIC ANGULAR-MOMENTUM
LOW-FREQUENCY OSCILLATIONS
EVAPORATION-WIND FEEDBACK
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37.3
论文数:
634
被引数:
1.8W
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