DOI: 10.1007/s00382-011-1049-6
Scopus记录号: 2-s2.0-84855292284
论文题名: Regional climate simulations over South America: Sensitivity to model physics and to the treatment of lateral boundary conditions using the MM5 model
作者: Solman S.A. ; Pessacg N.L.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2012
卷: 38, 期: 2017-01-02 起始页码: 281
结束页码: 300
语种: 英语
英文关键词: MM5 model
; Regional climate modeling
; Sensitivity experiments
; South America
英文摘要: In this study the capability of the MM5 model in simulating the main mode of intraseasonal variability during the warm season over South America is evaluated through a series of sensitivity experiments. Several 3-month simulations nested into ERA40 reanalysis were carried out using different cumulus schemes and planetary boundary layer schemes in an attempt to define the optimal combination of physical parameterizations for simulating alternating wet and dry conditions over La Plata Basin (LPB) and the South Atlantic Convergence Zone regions, respectively. The results were compared with different observational datasets and model evaluation was performed taking into account the spatial distribution of monthly precipitation and daily statistics of precipitation over the target regions. Though every experiment was able to capture the contrasting behavior of the precipitation during the simulated period, precipitation was largely underestimated particularly over the LPB region, mainly due to a misrepresentation in the moisture flux convergence. Experiments using grid nudging of the winds above the planetary boundary layer showed a better performance compared with those in which no constrains were imposed to the regional circulation within the model domain. Overall, no single experiment was found to perform the best over the entire domain and during the two contrasting months. The experiment that outperforms depends on the area of interest, being the simulation using the Grell (Kain-Fritsch) cumulus scheme in combination with the MRF planetary boundary layer scheme more adequate for subtropical (tropical) latitudes. The ensemble of the sensitivity experiments showed a better performance compared with any individual experiment. © 2011 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55404
Appears in Collections: 过去全球变化的重建
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作者单位: Centro de Investigaciones del Mar y la Atmósfera (CIMA), CONICET-UBA, Ciudad Universitaria, Pabellón II-Piso 2 (1428), Buenos Aires, Argentina; Departamento de Ciencias de la Atmósfera y los Océanos, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Recommended Citation:
Solman S.A.,Pessacg N.L.. Regional climate simulations over South America: Sensitivity to model physics and to the treatment of lateral boundary conditions using the MM5 model[J]. Climate Dynamics,2012-01-01,38(2017-01-02)