Factors Controlling the Interannual Variations of MJO Intensity

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  • Corresponding author: LI Tim
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Supported by the National (Key) Basic Research and Development (973) Program of China (2015CB453200), National Natural Science Foundation of China (41475084 and 41375095), Naval Research Laboratory (N00173-16-1-G906), Jiangsu Natural Science Key Project (BK20150062), Jiangsu Shuang-Chuang Team (R2014SCT001), and Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD). This is SOEST contribution number 9620, IPRC contribution number 1187, and ESMC number 099.

DOI: 10.1007/s13351-016-5113-3

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    Abstract

  • Abstract

    The interannual variations of intensity of the Madden-Julian Oscillation (MJO) during boreal winter are investigated by using the observed outgoing longwave radiation (OLR) and the reanalysis data of ECMWF and NCEP. The standard deviation of 20-80-day filtered OLR anomaly is used to measure the MJO intensity. The dominant spatial structure of the interannual variability is revealed by an EOF analysis of the MJO intensity field. It is found that the leading mode is associated with eastern Pacific type ENSO, whereas the second mode is related to central Pacific type ENSO. A simple atmospheric model is used to investigate the relative roles of background moisture and wind changes in affecting the overall strength of MJO. The numerical experiments indicate that the background moisture effect is dominant while the background wind change has a minor effect.
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