Possible Causes of the Interdecadal Transition of the Somali Jet Around the Late 1990s

This observational study demonstrates that the Somali jet（SMJ） experienced a notable interdecadal transition in not only its lower-level parts（〈 850 hP a） but also its higher-level parts（850-600 h Pa） in the late 1990 s. The results also show that the jet at higher level is more significantly relate...

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Published inActa meteorologica Sinica Vol. 29; no. 2; pp. 214 - 227
Main Author 肖子牛 石文静 杨萍
Format Journal Article
LanguageEnglish
Published Beijing The Chinese Meteorological Society 01.04.2015
Subjects
Atmospheric Protection/Air Quality Control/Air Pollution
Atmospheric Sciences
Earth and Environmental Science
Earth Sciences
Geophysics and Environmental Physics
Marine
Meteorology
东亚季风
南印度洋
原因
年代际
水平射流
索马里急流
风速
ISW, Arabian Sea, Somali Jet
ISW, Indian Ocean
Asian summer monsoon
index
southern Indian Ocean
Somali jet
interdecadal transition
sea surface temperature
Online AccessGet full text
ISSN2095-6037
0894-0525
2198-0934
2191-4788
DOI10.1007/s13351-015-4103-1

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Summary:This observational study demonstrates that the Somali jet（SMJ） experienced a notable interdecadal transition in not only its lower-level parts（〈 850 hP a） but also its higher-level parts（850-600 h Pa） in the late 1990 s. The results also show that the jet at higher level is more significantly related to East Asian monsoon rainfall than that at lower level. Thus, a new whole-layer SMJ（WSMJ） index which includes variations of the higher-level jet is defined based on the average meridional wind speed at five levels（1000-600 h Pa）. The interdecadal transition of the SMJ can be mainly attributed to the meridional thermal contrast anomalies near the equator which are associated with the three-pole pattern of the southern Indian Ocean.
Bibliography:11-2277/P
This observational study demonstrates that the Somali jet（SMJ） experienced a notable interdecadal transition in not only its lower-level parts（〈 850 hP a） but also its higher-level parts（850-600 h Pa） in the late 1990 s. The results also show that the jet at higher level is more significantly related to East Asian monsoon rainfall than that at lower level. Thus, a new whole-layer SMJ（WSMJ） index which includes variations of the higher-level jet is defined based on the average meridional wind speed at five levels（1000-600 h Pa）. The interdecadal transition of the SMJ can be mainly attributed to the meridional thermal contrast anomalies near the equator which are associated with the three-pole pattern of the southern Indian Ocean.
interdecadal transition,Somali jet,index,Asian summer monsoon,southern Indian Ocean,sea surface temperature
XIAO Ziniu, SHI Wenjing and YANG Ping（ I Department of Atmospheric Science, Nanjing University of Information Science ＆ Technology, Nanjing 210044, China 2 State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China 3 China Meteorological Administration Training Center, Beijing 100081, China 4 Cooperative Institute for Meteorological Satellite Studies, University of Wisconsin-Madison, Madison, WI 53706, USA）
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ISSN:2095-6037
0894-0525
2198-0934
2191-4788
DOI:10.1007/s13351-015-4103-1