DOI: 10.1175/JCLI-D-14-00328.1
Scopus记录号: 2-s2.0-84926059279
论文题名: MJO initiation processes over the tropical Indian ocean during DYNAMO/CINDY2011
作者: Li T. ; Zhao C. ; Hsu P.-C. ; Nasuno T.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 6 起始页码: 2121
结束页码: 2135
语种: 英语
Scopus关键词: Advection
; Interactive devices
; NASA
; Troposphere
; Equatorial Indian Ocean
; Indian ocean experiments
; Initiation process
; Intraseasonal variability
; Observational data
; Triggering mechanism
; Tropical Indian ocean
; Tropospheric moistening
; Oceanography
; atmospheric convection
; gyre
; humidity
; Madden-Julian oscillation
; troposphere
; Indian Ocean
; Indian Ocean (Tropical)
英文摘要: A multination joint field campaign called the Dynamics of MJO/Cooperative Indian Ocean Experiment on Intraseasonal Variability in Year 2011 (DYNAMO/CINDY2011) took place in the equatorial Indian Ocean (IO) in late 2011. During the campaign period, two strong MJO events occurred from the middle of October to the middle of December (referred to as MJO I and MJO II, respectively). Both the events were initiated over the western equatorial Indian Ocean (WIO) around 50°-60°E. Using multiple observational data products (ERA-Interim, the ECMWF final analysis, and NASA MERRA), the authors unveil specific processes that triggered the MJO convection in the WIO. It is found that, 10 days prior to MJO I initiation, a marked large-scale ascending motion anomaly appeared in the lower troposphere over the WIO. The cause of this intraseasonal vertical motion anomaly was attributed to anomalous warm advection by a cyclonic gyre anomaly over the northern IO. The MJO II initiation was preceded by a low-level specific humidity anomaly. This lower-tropospheric moistening was attributed to the advection of mean moisture by anomalous easterlies over the equatorial IO. The contrast of anomalous precursor winds at the equator (westerly versus easterly) implies different triggering mechanisms for the MJO I and II events. It was found that uppertropospheric circumnavigating signals did not contribute the initiation of both the MJO events. The EOF-based real-time multivariate MJO (RMM) indices should not be used to determineMJO initiation time and location because they are primarily used to capture large zonal scale and eastward-propagating signals, not localized features. © 2015 American Meteorological Society. 资助项目: NSFC, National Science Foundation
; NSF, National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50626
Appears in Collections: 气候变化事实与影响
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作者单位: Climate Dynamics Research Center and Earth System Modeling Center, International Laboratory on Climate and Environment Change, Nanjing University of Information Science and Technology, Nanjing, China; International Pacific Research Center, Department of Atmospheric Sciences, University of Hawaii at Manoa, Honolulu, HI, United States; National Climate Center, China Meteorological Administration, Beijing, China; Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan
Recommended Citation:
Li T.,Zhao C.,Hsu P.-C.,et al. MJO initiation processes over the tropical Indian ocean during DYNAMO/CINDY2011[J]. Journal of Climate,2015-01-01,28(6)