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DOI | 10.1029/2018JD029642 |
The Relation of Intraseasonal Variations With Local Onset and Demise of the Indian Summer Monsoon | |
Karmakar, Nirupam1; Misra, Vasubandhu1,2,3 | |
2019-03-16 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2019 |
卷号 | 124期号:5页码:2483-2506 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Two of the most important hydroclimatic features of the Indian summer monsoon (ISM) rainfall are its onset/demise and intraseasonal oscillations (ISOs) manifested by the active-break cycles. In this study, we aim to understand the quantitative association between these two phenomena. An objective definition of local onset/demise of the ISM based on more than a century-long India Meteorological Department rain gauge observation is taken into consideration. Using multichannel singular spectrum analysis we isolate northward-propagating low-frequency (20-60 days; LF-ISO) and northwestward propagating high-frequency (10-20 days; HF-ISO) ISOs from the daily ISM rainfall. Our results suggest that a large number of local onset (59%) and demise (62%) events occur during positive developing phases and positive decaying phases of two ISOs, respectively, with phase locking between LF-ISO and HF-ISO being particularly important. Local onset is largely associated with favorable phases of ISOs across India except for LF-ISO over eastern India and HF-ISO over western Ghats and central India (CI). We find that local demise is more coherent with the ISO phases, especially with HF-ISO across the domain. We performed a case study to understand large-scale association with the onset of the ISM over CI. In 44 of total 58 cases (1948-2005), when CI onset occurred during favorable LF-ISO or HF-ISO phase, they are either linked with a northward propagation of convection from the equator in LF-ISO time scale (28 cases) or westward propagating structures from the western Pacific in HF-ISO time scale (27 cases). |
英文关键词 | Indian monsoon rainfall local onset and demise intraseasonal oscillations large-scale circulations |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000462139800007 |
WOS关键词 | INTERANNUAL VARIABILITY ; OBJECTIVE DEFINITION ; TIBETAN PLATEAU ; RAINY-SEASON ; OSCILLATIONS ; RAINFALL ; PREDICTABILITY ; SENSITIVITY ; ANOMALIES ; EVOLUTION |
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/181671 |
专题 | 气候变化 |
作者单位 | 1.Florida State Univ, Earth Ocean & Atmospher Sci Dept, Tallahassee, FL 32306 USA; 2.Florida State Univ, Ctr Ocean Atmospher Predict Studies, Tallahassee, FL 32306 USA; 3.Florida State Univ, Florida Climate Inst, Tallahassee, FL 32306 USA |
推荐引用方式 GB/T 7714 | Karmakar, Nirupam,Misra, Vasubandhu. The Relation of Intraseasonal Variations With Local Onset and Demise of the Indian Summer Monsoon[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2019,124(5):2483-2506. |
APA | Karmakar, Nirupam,&Misra, Vasubandhu.(2019).The Relation of Intraseasonal Variations With Local Onset and Demise of the Indian Summer Monsoon.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,124(5),2483-2506. |
MLA | Karmakar, Nirupam,et al."The Relation of Intraseasonal Variations With Local Onset and Demise of the Indian Summer Monsoon".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 124.5(2019):2483-2506. |
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