A New Dynamical Index for India-Burma Trough
Based on the vertical velocity field of reanalysis datasets, this study defines a new dynamical index for the India-Burma trough and supports this index’s advantages by analyzing reanalysis and observational datasets. For a convenient understanding, the vertical velocities of 5 levels ranging from 7...
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| Format: | Article |
| Language: | English |
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Wiley
2018-01-01
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| Series: | Advances in Meteorology |
| Online Access: | http://dx.doi.org/10.1155/2018/5215093 |
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| author | Kui Liu Jinlin Zha Ruowen Yang Jilong Chen |
| author_facet | Kui Liu Jinlin Zha Ruowen Yang Jilong Chen |
| author_sort | Kui Liu |
| collection | DOAJ |
| description | Based on the vertical velocity field of reanalysis datasets, this study defines a new dynamical index for the India-Burma trough and supports this index’s advantages by analyzing reanalysis and observational datasets. For a convenient understanding, the vertical velocities of 5 levels ranging from 700 hPa to 500 hPa within the area of 15.625°N–24.375°N and 90.625°E–100.625°E are multiplied by −1 and summed up into a time series involving each year from 1979 to 2012. The standardized value of the time series is defined as the index of India-Burma trough (IIBT). IIBT can reflect the characteristics of the annual strength and the interdecadal variation of the India-Burma trough. IIBT can also well reveal the relationship between the India-Burma trough and its upstream teleconnection. What is more, through a correlation analysis on the grid point precipitation field, respectively, with the IIBT and the India-Burma trough indices defined with vorticity and geopotential height, over southern Asia the correlation pattern between the IIBT and the precipitation field is found to nearly be the sum of the correlation patterns of the latter 2 indices with the precipitation. To the south of the TP, the correlation field between the IIBT and the grid point precipitation shows dipolar distribution, which is consistent with the correlation patterns of the IIBT with the vertical velocity, specific humidity, and the mid-level geopotential height in the same spatial location. IIBT is beneficial for more accurate study of the impact of the India-Burma trough on the associated weather and climate. |
| format | Article |
| id | doaj-art-e5795341fbd840d6ab1bb215b4595f74 |
| institution | Kabale University |
| issn | 1687-9309 1687-9317 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
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| series | Advances in Meteorology |
| spelling | doaj-art-e5795341fbd840d6ab1bb215b4595f742025-02-03T01:23:57ZengWileyAdvances in Meteorology1687-93091687-93172018-01-01201810.1155/2018/52150935215093A New Dynamical Index for India-Burma TroughKui Liu0Jinlin Zha1Ruowen Yang2Jilong Chen3Department of Atmospheric Science, Yunnan University, Kunming 650091, ChinaDepartment of Atmospheric Science, Yunnan University, Kunming 650091, ChinaDepartment of Atmospheric Science, Yunnan University, Kunming 650091, ChinaCenter for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100089, ChinaBased on the vertical velocity field of reanalysis datasets, this study defines a new dynamical index for the India-Burma trough and supports this index’s advantages by analyzing reanalysis and observational datasets. For a convenient understanding, the vertical velocities of 5 levels ranging from 700 hPa to 500 hPa within the area of 15.625°N–24.375°N and 90.625°E–100.625°E are multiplied by −1 and summed up into a time series involving each year from 1979 to 2012. The standardized value of the time series is defined as the index of India-Burma trough (IIBT). IIBT can reflect the characteristics of the annual strength and the interdecadal variation of the India-Burma trough. IIBT can also well reveal the relationship between the India-Burma trough and its upstream teleconnection. What is more, through a correlation analysis on the grid point precipitation field, respectively, with the IIBT and the India-Burma trough indices defined with vorticity and geopotential height, over southern Asia the correlation pattern between the IIBT and the precipitation field is found to nearly be the sum of the correlation patterns of the latter 2 indices with the precipitation. To the south of the TP, the correlation field between the IIBT and the grid point precipitation shows dipolar distribution, which is consistent with the correlation patterns of the IIBT with the vertical velocity, specific humidity, and the mid-level geopotential height in the same spatial location. IIBT is beneficial for more accurate study of the impact of the India-Burma trough on the associated weather and climate.http://dx.doi.org/10.1155/2018/5215093 |
| spellingShingle | Kui Liu Jinlin Zha Ruowen Yang Jilong Chen A New Dynamical Index for India-Burma Trough Advances in Meteorology |
| title | A New Dynamical Index for India-Burma Trough |
| title_full | A New Dynamical Index for India-Burma Trough |
| title_fullStr | A New Dynamical Index for India-Burma Trough |
| title_full_unstemmed | A New Dynamical Index for India-Burma Trough |
| title_short | A New Dynamical Index for India-Burma Trough |
| title_sort | new dynamical index for india burma trough |
| url | http://dx.doi.org/10.1155/2018/5215093 |
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