Impact of the MJO on the interannual variation of the Pacific–Japan mode of the East Asian summer monsoon.

Li, Xinyu, Gollan, Gereon , Greatbatch, Richard John and Lu, Riyu (2019) Impact of the MJO on the interannual variation of the Pacific–Japan mode of the East Asian summer monsoon. Open Access Climate Dynamics, 52 (5-6). pp. 3489-3501. DOI 10.1007/s00382-018-4328-7.

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Abstract

The spatial pattern of the first mode of interannual variability associated with the East Asian summer monsoon (EASM), obtained from a multivariate Empirical Orthogonal Functions (MV-EOF) analysis, corresponds to the Pacific–Japan (PJ) pattern and is referred to as the PJ-mode. The present study investigates the interannual variation of the PJ-mode from the perspective of the intraseasonal timescale. In particular, the impact of the Madden–Julian oscillation (MJO) on the interannual variation of the PJ-mode is investigated. The results show that the MJO has a significant influence on the interannual variation of the PJ-mode mainly in the lower troposphere (850 hPa) and that the former accounts for approximately 11% of the amplitude of the latter. The major part of the contribution comes from a change in frequency of the different phases of the MJO, especially that of MJO phase 6. This suggests that intraseasonal variation of the convection anomalies over the tropical eastern Indian and western Pacific Oceans plays an important role in the interannual variation of the PJ-mode. In addition, MJO phase 7 also contributes to the interannual variability of the PJ-mode, in this case induced by both the change in frequency and the change in circulation anomalies associated with MJO phase 7.

Document Type: Article
Keywords: East Asian summer monsoon (EASM); Pacific–Japan pattern; Madden–Julian oscillation (MJO); intraseasonal variability, interannual variability
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-OD Ocean Dynamics
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1007/s00382-018-4328-7
ISSN: 0930-7575
Related URLs:
Projects: ATMOS-MODINI, MiKlip2
Date Deposited: 28 Jun 2018 11:45
Last Modified: 28 May 2019 07:07
URI: http://oceanrep.geomar.de/id/eprint/43516

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