DOI: 10.1175/JCLI-D-16-0336.1
Scopus记录号: 2-s2.0-85012250824
论文题名: Differences in the initiation and development of the Madden-Julian oscillation over the Indian ocean associated with two types of El Niño
作者: Hsu P.-C. ; Xiao T.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2017
卷: 30, 期: 4 起始页码: 1397
结束页码: 1415
语种: 英语
Scopus关键词: Advection
; Budget control
; Climate change
; Heat flux
; Moisture
; Nickel
; Oceanography
; Wind effects
; Indian ocean
; Interannual variability
; Intraseasonal variability
; Madden-Julian oscillation
; Moisture/moisture budgets
; Climatology
; advection
; annual variation
; atmospheric forcing
; El Nino
; latent heat flux
; Madden-Julian oscillation
; radiative forcing
; seasonal variation
; stratification
; troposphere
; Indian Ocean
; Indian Ocean (East)
; Pacific Ocean
; Pacific Ocean (Central)
; Pacific Ocean (East)
英文摘要: The influences of different types of Pacific warming, often classified as the eastern Pacific (EP) and central Pacific (CP) El Niño events, on Madden-Julian oscillation (MJO) activity over the Indian Ocean were investigated. Accompanied by relatively unstable (stable) atmospheric stratification induced by enhanced (reduced) moisture and moist static energy (MSE) in the lower troposphere, strengthened (weakened) MJO convection was observed in the initiation and eastward-propagation stages during CP (EP) El Niño events. To examine the key processes resulting in the differences in low-level moistening and column MSE anomalies over the Indian Ocean associated with the two types of El Niño, the moisture and column MSE budget equations were diagnosed using the reanalysis dataset ERA-Interim. The results indicate that the enhanced horizontal advection in the CP El Niño years plays an important role in causing a larger moisture and MSE growth rate over the MJO initiation area during CP El Niño events than during EP El Niño events. The increases in horizontal moisture and MSE advection primarily result from advection by mean flow across the enhanced intraseasonal moisture and MSE gradient, as well as by intraseasonal circulation across the mean moisture and MSE gradient associated with the CP El Niño. In the eastward development stage, the enhanced preconditioning comes from positive moisture and MSE advection anomalies in the CP El Niño events. Meanwhile, the strengthened MJO-related convection over the central-eastern Indian Ocean is maintained by increased atmospheric radiative heating and surface latent heat flux during the CP El Niño compared to the EP El Niño events. © 2017 American Meteorological Society. 资助项目: NSFC, National Natural Science Foundation of China
; Natural Science Foundation of Jiangsu Province
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49787
Appears in Collections: 气候变化事实与影响
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作者单位: Key Lab of Meteorological Disaster of Ministry of Education,Nanjing Univ of Information Science,Tech, Joint International Research Laboratory of Climate and Environment Change, Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing, China
Recommended Citation:
Hsu P.-C.,Xiao T.. Differences in the initiation and development of the Madden-Julian oscillation over the Indian ocean associated with two types of El Niño[J]. Journal of Climate,2017-01-01,30(4)