Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1007/s00382-017-3596-y |
Seasonality and mechanisms of tropical intraseasonal oscillations | |
Hazra, Abheera1; Krishnamurthy, V.1,2 | |
2018 | |
发表期刊 | CLIMATE DYNAMICS
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ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2018 |
卷号 | 50页码:179-199 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | This study has compared the monsoon intraseasonal oscillation (MISO) during the boreal summer and Madden Julian Oscillation (MJO) during the boreal winter. Based on MISO and MJO in high-resolution three-dimensional diabatic heating, the possible mechanisms are discussed through observational analyses of dynamical and thermodynamical variables. The MISO and MJO are extracted as nonlinear oscillations during boreal summer and winter, respectively, by applying multi-channel singular spectrum analysis on daily anomalies of diabatic heating over the Indo-Pacific region. Lead and lag relations among moisture, temperature and surface fields relative to diabatic heating are analyzed to compare the mechanisms of MISO and MJO. While both the oscillations show eastward propagation, MISO has a strong northward propagation and MJO has a weak southward propagation as well. The analysis shows that MJO and MISO are essentially driven by the same mechanisms but with some difference in the meridional propagation. The westerly shear leads the diabatic heating, while the vorticity has weak correlation. Large-scale circulation creates positive moisture preconditioning before convection and negative moisture preconditioning before suppressed conditions. A positive lower level horizontal advection of temperature and upper level temperature tendencies lead the convective state while a negative lower level horizontal advection of temperature and upper level temperature tendencies lead the suppressed state. There is positive feedback from the SST to atmosphere. The difference in the meridional propagation of MISO and MJO is hypothesized to be because of the different differential heating meridionally during the two seasons. |
英文关键词 | Monsoon intraseasonal oscillation (MISO) Madden julian oscillation (MJO) Tropical intraseasonal oscillations Seasonality of tropical intraseasonal oscillations |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000422908700012 |
WOS关键词 | MADDEN-JULIAN OSCILLATION ; OUTGOING LONGWAVE RADIATION ; TEMPERATURE-GRADIENT APPROXIMATION ; SEA-SURFACE TEMPERATURES ; MODEL ; SUMMER ; VARIABILITY ; ATMOSPHERE ; CONVECTION ; NORTHWARD |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/35702 |
专题 | 气候变化 |
作者单位 | 1.George Mason Univ, Dept Atmospher Ocean & Earth Sci, 4400 Univ Dr, Fairfax, VA 22030 USA; 2.George Mason Univ, Ctr Ocean Land Atmosphere Studies, Fairfax, VA 22030 USA |
推荐引用方式 GB/T 7714 | Hazra, Abheera,Krishnamurthy, V.. Seasonality and mechanisms of tropical intraseasonal oscillations[J]. CLIMATE DYNAMICS,2018,50:179-199. |
APA | Hazra, Abheera,&Krishnamurthy, V..(2018).Seasonality and mechanisms of tropical intraseasonal oscillations.CLIMATE DYNAMICS,50,179-199. |
MLA | Hazra, Abheera,et al."Seasonality and mechanisms of tropical intraseasonal oscillations".CLIMATE DYNAMICS 50(2018):179-199. |
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