| DOI: | 10.1002/jgrd.50144
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| 论文题名: | Intraseasonal oscillation associated with the Indian winter monsoon |
| 作者: | Dimri A.P.
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| 刊名: | Journal of Geophysical Research Atmospheres
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| ISSN: | 21698996
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| 出版年: | 2013
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| 卷: | 118, 期:3 | | 起始页码: | 1189
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| 结束页码: | 1198
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| 语种: | 英语
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| 英文关键词: | Indian winter monsoon
; Intraseasonal oscillation
; Moisture convergence
; Western disturbances
; Western Himalayas
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| Scopus关键词: | Moisture
; Tropical engineering
; Intraseasonal oscillations
; Moisture convergence
; Western disturbances
; Western himalayas
; Winter monsoon
; Atmospheric thermodynamics
; annual variation
; atmospheric convection
; cyclone
; longwave radiation
; precipitation (climatology)
; seasonal variation
; synoptic meteorology
; winter
; Arabian Sea
; Himalayas
; India
; Indian Ocean
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| 英文摘要: | The Indian winter (December-February) monsoon (IWM) contributes almost one third of the annual precipitation over the western Himalayas (WH). In winter, eastward moving synoptic weather systems, or "western disturbances" (WDs), yield precipitation in either liquid or solid form. Although previous studies have examined the interannual variation (IAV) of the IWM, little is known of the intraseasonal oscillation (ISO) associated with the IWM. The present study examines the ISO and its plausible effects on the IWM using 28 years (1980-2007) of precipitation, height, wind, and outgoing longwave radiation (OLR) fields. The dominant ISO mode is found during the active IWM phase with well-defined cyclonic circulation in the midtroposphere over the WH. The relationship between OLR and circulation indicates that this ISO mode is driven by moisture convergence. During the peak phase, a strong moisture influx from the Arabian Sea dominates. This moisture incursion adds to the precipitation over the WH. Successive growth and decay of anomalous cyclonic and anticyclonic circulation takes place within ISO periodicity. Strong convection always seems to precede anomalous cyclonic circulation. In addition, in-phase wind and convection (over the WH region) are associated with the ISO phase. Key PointsThis corresponds to evolution of western disturbancesAtmospheric structure of Indian winter monsoon presentedIndian winter monsoon is not understood well ©2013. American Geophysical Union. All Rights Reserved. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/63946
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| Appears in Collections: | 影响、适应和脆弱性
气候减缓与适应
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作者单位: | School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India
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| Recommended Citation: | |
Dimri A.P.. Intraseasonal oscillation associated with the Indian winter monsoon[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(3)
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