Zonal‐Scale of the Madden‐Julian Oscillation and Its Propagation Speed on the Interannual Time‐Scale
Abstract While no significant long‐term trend in the propagation speed of the Madden‐Julian Oscillation (MJO) in boreal winter is found during the past decades, pronounced year‐to‐year variability of the MJO phase speed is illustrated by analyzing a century‐long record data set. During the winters w...
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| Format: | Article |
| Language: | English |
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Wiley
2021-03-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2020GL091239 |
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| author | Mengxia Lyu Xianan Jiang Zhiwei Wu Daehyun Kim Ángel F. Adames |
| author_facet | Mengxia Lyu Xianan Jiang Zhiwei Wu Daehyun Kim Ángel F. Adames |
| author_sort | Mengxia Lyu |
| collection | DOAJ |
| description | Abstract While no significant long‐term trend in the propagation speed of the Madden‐Julian Oscillation (MJO) in boreal winter is found during the past decades, pronounced year‐to‐year variability of the MJO phase speed is illustrated by analyzing a century‐long record data set. During the winters when fast MJO propagation is observed, the MJO exhibits a much larger zonal‐scale than that during the winters with slow propagation. A broader extension in MJO circulation effectively induces stronger and broader lower‐tropospheric moistening (drying) to the east (west) of MJO through horizontal moisture advection, prompting a faster MJO phase speed. The larger MJO zonal‐scale during the fast MJO propagation winters is coincident with anomalously increased background sea surface temperatures and precipitable water over both the western Indian Ocean and central/eastern Pacific, reminiscent of an expansion of the Indo‐Pacific warm pool. A fundamental question remains open regarding the key processes that determine the zonal‐scale of MJO organization. |
| format | Article |
| id | doaj-art-8f24eeebc1804fdf9d949fd1e64ee940 |
| institution | DOAJ |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2021-03-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-8f24eeebc1804fdf9d949fd1e64ee9402025-08-20T03:11:04ZengWileyGeophysical Research Letters0094-82761944-80072021-03-01486n/an/a10.1029/2020GL091239Zonal‐Scale of the Madden‐Julian Oscillation and Its Propagation Speed on the Interannual Time‐ScaleMengxia Lyu0Xianan Jiang1Zhiwei Wu2Daehyun Kim3Ángel F. Adames4College of Atmosphere Sciences Nanjing University of Information Science and Technology Nanjing ChinaJoint Institute for Regional Earth System Science and Engineering University of California Los Angeles CA USADepartment of Atmospheric and Oceanic Sciences / Institute of Atmospheric Sciences Fudan University Shanghai ChinaDepartment of Atmospheric Sciences University of Washington Seattle WA USADepartment of Atmospheric and Oceanic Sciences University of Wisconsin Madison WI USAAbstract While no significant long‐term trend in the propagation speed of the Madden‐Julian Oscillation (MJO) in boreal winter is found during the past decades, pronounced year‐to‐year variability of the MJO phase speed is illustrated by analyzing a century‐long record data set. During the winters when fast MJO propagation is observed, the MJO exhibits a much larger zonal‐scale than that during the winters with slow propagation. A broader extension in MJO circulation effectively induces stronger and broader lower‐tropospheric moistening (drying) to the east (west) of MJO through horizontal moisture advection, prompting a faster MJO phase speed. The larger MJO zonal‐scale during the fast MJO propagation winters is coincident with anomalously increased background sea surface temperatures and precipitable water over both the western Indian Ocean and central/eastern Pacific, reminiscent of an expansion of the Indo‐Pacific warm pool. A fundamental question remains open regarding the key processes that determine the zonal‐scale of MJO organization.https://doi.org/10.1029/2020GL091239Indo‐Pacific warm poolMadden‐Julian OscillationMJO phase speedmoisture mode theory |
| spellingShingle | Mengxia Lyu Xianan Jiang Zhiwei Wu Daehyun Kim Ángel F. Adames Zonal‐Scale of the Madden‐Julian Oscillation and Its Propagation Speed on the Interannual Time‐Scale Geophysical Research Letters Indo‐Pacific warm pool Madden‐Julian Oscillation MJO phase speed moisture mode theory |
| title | Zonal‐Scale of the Madden‐Julian Oscillation and Its Propagation Speed on the Interannual Time‐Scale |
| title_full | Zonal‐Scale of the Madden‐Julian Oscillation and Its Propagation Speed on the Interannual Time‐Scale |
| title_fullStr | Zonal‐Scale of the Madden‐Julian Oscillation and Its Propagation Speed on the Interannual Time‐Scale |
| title_full_unstemmed | Zonal‐Scale of the Madden‐Julian Oscillation and Its Propagation Speed on the Interannual Time‐Scale |
| title_short | Zonal‐Scale of the Madden‐Julian Oscillation and Its Propagation Speed on the Interannual Time‐Scale |
| title_sort | zonal scale of the madden julian oscillation and its propagation speed on the interannual time scale |
| topic | Indo‐Pacific warm pool Madden‐Julian Oscillation MJO phase speed moisture mode theory |
| url | https://doi.org/10.1029/2020GL091239 |
| work_keys_str_mv | AT mengxialyu zonalscaleofthemaddenjulianoscillationanditspropagationspeedontheinterannualtimescale AT xiananjiang zonalscaleofthemaddenjulianoscillationanditspropagationspeedontheinterannualtimescale AT zhiweiwu zonalscaleofthemaddenjulianoscillationanditspropagationspeedontheinterannualtimescale AT daehyunkim zonalscaleofthemaddenjulianoscillationanditspropagationspeedontheinterannualtimescale AT angelfadames zonalscaleofthemaddenjulianoscillationanditspropagationspeedontheinterannualtimescale |