El Niño衰退年印度洋海盆模态对印度夏季季风降水的影响

doi:10.11978/2016054

Abstract

Abstract:

Based on the All India Rainfall data, NCEP/NCAR reanalysis data and HadISST data, we demonstrated a delayed effect of the El Nino-Southern Oscillation (ENSO) and Indian Ocean Basin (IOB) mode on Indian summer monsoon rainfall (ISMR). The results showed that decreased Indian rainfall in the early summer (Jun-Jul) and increased rainfall in the late summer (Aug-Sep) are influenced by the anti-symmetric mode and the second warming in the northern Indian Ocean (NIO). The responses of ISMR to El Niño are distinct between the developing and decaying years. In the developing year of El Niño, the ISMR decreases due to the change of Walker circulation in the tropical ocean. In the decaying year, the IOB mode decreases (increases) the ISMR in early (late) boreal summer. The anti-symmetric pattern of atmospheric anomalies with northeasterly (northwesterly) wind anomalies north (south) of the equator happens in spring. The northeasterly anomalies weaken the Indian Summer Monsoon and force the second anomalous sea surface temperature (SST) peak in the NIO by reducing wind speed and surface evaporation. The southwest monsoon brings more moisture (Q°), which is produced by the warm NIO SST to the India subcontinent, leading to increased monsoon rainfall in the late summer.

Key words: India summer monsoon rainfall, Indian Ocean Basin mode, anti-symmetric mode, northern Indian Ocean warming, El Nino-Southern Oscillation (ENSO)

CLC Number:

P732.6

Lianghong LÜ, Xiaotong ZHENG. The effect of Indian Ocean Basin mode on Indian Summer Monsoon Rainfall in decaying year of El Niño[J].Journal of Tropical Oceanography, 2017, 36(2): 1-11.

Figures/Tables 11

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	ISMR(JJAS)	ISMR(6月)	ISMR(7月)	ISMR(8月)	ISMR(9月)
Niño3.4	0.15	-0.46	0.04	0.32	0.45
IOB SST	0.19	-0.32	0.03	0.24	0.45
NIO SST	0.22	-0.49	0.03	0.30	0.59
AMI	-0.10	-0.61	-0.08	0.28	0.40

The effect of Indian Ocean Basin mode on Indian Summer Monsoon Rainfall in decaying year of El Niño

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