| DOI: | 10.1175/JCLI-D-11-00459.1
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| Scopus记录号: | 2-s2.0-84862745579
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| 论文题名: | Moist dynamics of extended monsoon breaks over South Asia |
| 作者: | Prasanna V.; Annamalai H.
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| 刊名: | Journal of Climate
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| ISSN: | 8948755
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| 出版年: | 2012
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| 卷: | 25, 期:11 | | 起始页码: | 3810
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| 结束页码: | 3831
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| 语种: | 英语
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| Scopus关键词: | Anomalous winds
; Anticyclonic circulation
; Central India
; Cloud-radiation interactions
; Coupled models
; Cyclonic circulation
; Ensemble integration
; Equatorial Indian Ocean
; European centre for medium-range weather forecasts
; Hadley circulation
; Intraseasonal variability
; Long waves
; Moist dynamics
; Moist process
; Moist static energy
; Moisture advection
; Moisture distribution
; Moisture gradient
; Monsoons
; Radiation budget
; Radiative cooling
; Radiative heating
; Radiative warming
; Rainfall anomaly
; Reanalysis
; Regional circulation
; Rossby wave response
; South Asia
; Advection
; Atmospheric thermodynamics
; Moisture
; Ocean currents
; Three dimensional
; Weather forecasting
; Rain
; anticyclone
; atmospheric circulation
; atmospheric modeling
; energy budget
; ensemble forecasting
; moisture
; monsoon
; radiation budget
; rainfall
; weather forecasting
; South Asia
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| 英文摘要: | In the present research to identify moist processes that initiate and maintain extended monsoon breaks over South Asia moisture and moist static energy (MSE) budgets are performed on the newly available European Centre for Medium-Range Weather Forecasts Interim reanalysis (ERA-Interim) and ensemble integrations from a coupled model. The hypothesis that interaction between moist physics and regional circulation and the role of cloud-radiation feedbacks are important is tested. Budget diagnostics show that dry advection is the principal moist process to initiate extended breaks. Its sources are (i) regional anticyclonic circulation anomalies forced by equatorial Indian Ocean negative rainfall anomalies advect low MSE air from north to central India, and (ii) rainfall enhancement over tropical west Pacific forces cyclonic circulation anomalies to its northwest as a Rossby wave response, and the northerlies at the poleward flank of this circulation advect air of low MSE content from north. The dominance of anomalous wind acting on climatological moisture gradient is confirmed from an examination of the moisture advection equation. A partition of various flux terms indicates that over central India, due to an increase in upwelling shortwave and longwave fluxes, radiative cooling increases during extended breaks. Here, enhanced rainfall over the equatorial Indian Ocean promotes anomalous radiative warming due to trapping of upwelling fluxes. The differential radiative heating anchors a local Hadley circulation with descent over central India. A direct implication of this research is that observational efforts are necessary to monitor the three-dimensional moisture distribution and cloud-radiation interaction over the monsoon region that would aid in better understanding, modeling, and predicting extended monsoon breaks. © 2012 American Meteorological Society. |
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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/52378
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| Appears in Collections: | 气候变化事实与影响
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作者单位: | International Pacific Research Center, University of Hawaii at Manoa, Honolulu, HI, United States
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| Recommended Citation: | |
Prasanna V.,Annamalai H.. Moist dynamics of extended monsoon breaks over South Asia[J]. Journal of Climate,2012-01-01,25(11)
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