INTRODUCTION  The road towards RegCM4 F. Giorgi1,*, R. O. Anyah2

Giorgi, Filippo; Anyah, Richard

doi:10.3354/cr01089

Cited by 71 publications

(26 citation statements)

References 28 publications

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“…The rainfall produced by the Emanuel scheme is larger than that produced by the aforementioned two schemes. This finding agrees with the study by Giorgi et al [2012]. Despite the reasonable magnitude of the summer rainfall simulated by the Grell and Kuo schemes, the two schemes produce weak EASM circulations that barely reach 30°N.…”

Section: Numerical Model and Experimental Designsupporting

confidence: 91%

“…Same as the old one, the RegCM4.1 contains a simple chemistry module that can simulate only the direct effect of the aerosols, which include dust, sulfate, black carbon, and organic carbon [Solmon et al, 2006]. The RegCMs (3 and 4) have been widely used to study the climatic effects of aerosols [Giorgi and Anyah, 2012]. For example, using the RegCM3, Ji et al [2011] simulated the direct effect of anthropogenic sulfate, black carbon, and organic carbon on the Indian summer monsoon; Zanis et al [2012] studied the feedback of anthropogenic aerosols on European climate.…”

Section: Numerical Model and Experimental Designmentioning

confidence: 99%

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Modeled interaction between the subseasonal evolving of the East Asian summer monsoon and the direct effect of anthropogenic sulfate

et al. 2014

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A regional climate model is used to conduct four experiments to reveal the interaction between the subseasonal evolving of the East Asia summer monsoon (EASM) and the direct effect of anthropogenic sulfate. One of the experiments is conducted without the emission of anthropogenic SO 2 . The other three are carried out with the 1, 1.5, and 2 multiples of the SO 2 emission of 2000, respectively. The model results suggest that in the rainfall, wind, and circulation of the EASM, the changes caused by the direct effect of anthropogenic sulfate on subseasonal time scale are within the model variability. The change of the EASM rainfall is not sensitive to sulfate forcing on subseasonal time scale but sensitive to the forcing on seasonal time scale. Moreover, rainfall change in the forcing experiments is significantly less (greater) than zero to the south (north) of the EASM rainfall centers on subseasonal time scale, but the EASM rainfall phase is not changed. The rainfall change associates with the correspondingly significant increase (decrease) of the atmospheric stability induced by the forcing of sulfate direct effect. The direct effect of sulfate plays different roles in different stages of the EASM subseasonal evolving. In the early stage, the EASM is significantly enhanced in terms of the interaction between tropical and midlatitude atmosphere. In the late stage, the EASM is weakened in terms of the large-scale atmospheric circulation. Lastly, the responses of the rainfall, wind, and circulation of the EASM to the linear changes in the SO 2 emission are nonlinear.

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Section: Numerical Model and Experimental Designsupporting

confidence: 91%

Section: Numerical Model and Experimental Designmentioning

confidence: 99%

Modeled interaction between the subseasonal evolving of the East Asian summer monsoon and the direct effect of anthropogenic sulfate

et al. 2014

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“…The RegCM4 is the latest version of the Abdus Salam ICTP regional climate model Giorgi and Anyah 2012). It is an evolution of the previous version (RegCM3), described by Pal et al (2007).…”

Section: Model Descriptionmentioning

confidence: 99%

Diagnosis of East African climate and the circulation mechanisms associated with extreme wet and dry events: a study based on RegCM4

et al. 2015

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The latest version of the International Centre for Theoretical Physics (ICTP) regional climate model (RegCM4) is used in this study to examine the East African climate, focusing on October to December (OND) rainfall and the circulation mechanisms associated with extreme wet and dry events over the period 1991-2008. Grell convection scheme with Fritsch-Chappell closure assumption is used. The experiment was performed with the initial and lateral boundary conditions obtained from ERA-interim gridded reanalysis at a 1.5°resolution. The simulation period was 1990-2008 at a resolution of 50 km. Results show that the model realistically simulates the annual cycle, the OND mean seasonal rainfall, and its interannual variability over the East African region, where the simulated rainfall tends to underestimate the observed rainfall. There is however a significant positive correlation between the simulated rainfall and the rainfall datasets used to evaluate the model performance. Further analysis revealed that, the model captures well the observed circulation anomaly patterns, with divergence at low level and convergence at upper level during dry years, and for wet years, convergence (divergence) was simulated at low (upper) level, especially over the western Indian Ocean and the study area. Dry years are hence characterized by sinking motion as oppose to wet years which depict rising motion. These were corroborated by the pressure vertical velocity (omega), which showed positive (negative) anomalies over the region during dry (wet) years. The findings from this study provide insight into the circulation anomaly associations with wet and dry events in the region. The observed biases indicate that the ability of the model in simulating the East African climate is still a significant challenge. Therefore, future work needs to focus on improving the performance of the model in climate research over the region.

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“…Recent upgrades of the RegCM model included a number of new physics packages that were based on physics schemes of the Community Climate Model, including new aerosol radiative transfer calculations, a new prognostic equation for cloud water, and a new parameterization of surface land use (see, e.g. Pal et al 2007, Solmon et al 2008, Elgu indi et al 2011, Giorgi & Anyah 2012 for more information).…”

Section: Modelmentioning

confidence: 99%

Seasonal forecasting of tropical cyclone activity in the coastal region of Vietnam using RegCM4.2

Phan-Van

Trinh-Tuan²,

Bui³

et al. 2015

Clim. Res.

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This study presents an experimental seasonal forecast of tropical cyclone (TC) activity for Vietnam's coastal region during the 2012−2013 typhoon seasons, using the Regional Climate Model (RegCM, version 4.2) to downscale the global Climate Forecasting System (CFS) forecast. Using an improved vortex tracking algorithm that detects vortex centers efficiently, RegCM reasonably forecasts the general distribution of TC counts in time as well as the TC track pattern during the entire experimental period from February to July 2012 and 2013, despite significant underestimation of the TC counts in the global CFS forecasts that are used as initial and lateral boundary conditions for the RegCM model. Further examination of the storm activity in the Vietnam East Sea that directly influences Vietnam's coastal region shows, however, that RegCM tends to overestimate the TC frequency in this sub-region compared to observation. This suggests that direct applications of the RegCM model for seasonal forecasts of TC activity in Vietnam's coastal region has a significant bias that will need to be corrected before the model can provide useful information.

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INTRODUCTION The road towards RegCM4 F. Giorgi1,*, R. O. Anyah2

Cited by 71 publications

References 28 publications

Modeled interaction between the subseasonal evolving of the East Asian summer monsoon and the direct effect of anthropogenic sulfate

Modeled interaction between the subseasonal evolving of the East Asian summer monsoon and the direct effect of anthropogenic sulfate

Diagnosis of East African climate and the circulation mechanisms associated with extreme wet and dry events: a study based on RegCM4

Seasonal forecasting of tropical cyclone activity in the coastal region of Vietnam using RegCM4.2

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