| DOI: | 10.1016/j.gloplacha.2013.12.011
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| 论文题名: | Impact of initial and boundary conditions on regional winter climate over the Western Himalayas: A fixed domain size experiment |
| 作者: | Maharana P.; Dimri A.P.
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| ISSN: | 0921-8454
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| 出版年: | 2014
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| 卷: | 114 | | 起始页码: | 1
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| 结束页码: | 13
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| 语种: | 英语
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| 英文关键词: | Ensemble
; Regional climate model
; Western Disturbances
; Western Himalayas
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| Scopus关键词: | Ensemble
; Environmental prediction
; European centre for medium-range weather forecasts
; Initial and boundary conditions
; Meteorological parameters
; Regional climate modeling
; Western Disturbances
; Western himalayas
; Boundary conditions
; Climate change
; Climate models
; Research
; Computer simulation
; annual variation
; climate modeling
; data set
; energy balance
; ensemble forecasting
; evaporation
; experimental study
; moisture flux
; numerical model
; regional climate
; seasonality
; synoptic meteorology
; temperature profile
; temporal analysis
; topographic mapping
; weather forecasting
; winter
; Himalayas
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| 英文摘要: | The Western Himalayas during winter receives precipitation due to the eastward moving low pressure synoptic weather systems, called Western Disturbances (WDs) in Indian meteorological parlance. The complex Himalayan topography, sparse observational data, less understanding of physical processes, etc. form many interesting research questions over this region. One of the important research goals is to study the change in the winter (Dec., Jan. and Feb. - DJF) climate over the Himalayas. In the presented study with modelling efforts having varying initial and boundary conditions (ICBC) with same model physics option is attempted to provide a comment on important physical processes pertaining to precipitation and temperature fields. A 22. year (1980-2001) simulation with Regional Climate Model version 3 (RegCM3) forced with National Centre for Environmental Prediction/National Centre for Atmospheric Research (NCEP/NCAR) reanalysis 1 (NNRP1), NCEP/NCAR reanalysis 2 (NNRP2) and European Centre for Medium Range Weather Forecast 40. Year reanalysis (ERA40) as three different ICBC is carried out. The present study focuses on the winter climatology of the main meteorological parameters viz., temperature, precipitation and snow depth and interannual variability of winter seasonal precipitation. The model shows overestimation of seasonal average precipitation and underestimation of seasonal average temperature fields over the Western Himalayas in all the three model simulations. The interannual variability of precipitation and temperature over this region is nicely captured by the model. The model simulation with NNRP2 as the ICBC shows more realistic results. In addition the ensemble mean of the three simulations has shown improved results and is closer to the abovementioned simulation. Precipitation bias explained in terms of the higher vertical integrated moisture flux and transport shows strong convergence zone over and along the southern rim of the Indian Himalayas. The energy balance over the Western Himalayas explains the cause of lower temperature in the model simulation and the cause of lesser convective precipitation and evaporation. © 2013 Elsevier B.V. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84892518057&doi=10.1016%2fj.gloplacha.2013.12.011&partnerID=40&md5=10a58c32dc41ed53372c307d87257e66
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| Citation statistics: |
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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/11360
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| Appears in Collections: | 全球变化的国际研究计划
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作者单位: | School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India
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| Recommended Citation: | |
Maharana P.,Dimri A.P.. Impact of initial and boundary conditions on regional winter climate over the Western Himalayas: A fixed domain size experiment[J],2014-01-01,114.
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