This experiment configuration is the first step on the The precipitation and temperature anomalies typical of these events are reproduced by most of the Eta-CPTEC/HadCM 3 ensemble, although small displacements of the positions of the anomalies occur. The frequency of the El Nino and La Nina events in the studied period is underestimated by HadCM 3. El Nino and La Nina years were identified in the HadCM 3 member runs based on the NOAA Climate Prediction Center criterion of sea surface temperature anomalies in the Nino 3.4 area. On the other hand, the benefits in using an ensemble is clear in the improved representation of the seasonal cycle by the ensemble mean over any one realization. The spread in the downscaled mean precipitation and temperature is small when compared against model errors. The upper and low-level circulation patterns produced by the Eta-CPTEC/HadCM 3 experiment set-up show good agreement with reanalysis data and the mean precipitation and temperature with CRU observation data. Results are shown for austral summer and winter at present climate defined as 1961-90. No large-scale internal nudging was applied. The Eta Model nested in the HadCM 3 global model was configured with 40-km horizontal resolution and 38 layers in the vertical. Each member of the global model ensemble has a different climate sensitivity, and the four members were selected to span the range of uncertainty encompassed by the ensemble. The global model lateral conditions with a resolution of 2.5 latitude x 3.75 longitude were provided at a frequency of 6 h. The Eta Model has been modified with the purpose of performing long-term decadal integrations and has shown to reproduce ''present climate'' - the period 1961-1990 - reasonably well when forced by HadCM 3. The objective of this work is to evaluate climate simulations over South America using the regional Eta Model driven by four members of an ensemble of the UK Met Office Hadley Centre HadCM 3 global model. Tavares, Priscila [National Institute for Space Research (INPE), Sao Paulo (Brazil) Kay, Gillian Betts, Richard [UK Met Office Hadley Centre, Devon (United Kingdom) This evaluation, combined with the relatively fast computational speed (up to 1000 times faster than some CMIP6 models, motivates continued development and scientific use of the HadCM 3B family of coupled climate models, predominantly for quantifying uncertainty and for long multi-millennial-scale simulations.ĭownscaling of South America present climate driven by 4-member HadCM 3 runsĮnergy Technology Data Exchange (ETDEWEB)Ĭhou, Sin Chan Marengo, Jose A. By comparing with observational datasets, we show that these models produce a good representation of many aspects of the climate system, including the land and sea surface temperatures, precipitation, ocean circulation, and vegetation. These also include three versions of the land surface scheme. The BRIDGE HadCM 3 family of climate models: HadCM of Open Access Journals (Sweden) This evaluation, combined with the relatively fast computational speed (up to 1000 times faster than some CMIP6 models), motivates continued development and scientific use of the HadCM 3B family of coupled climate models, predominantly for quantifying uncertainty and for long multi-millennial-scale simulations. Three versions of the land surface scheme. Farnsworth, Alex Gordon, Chris Hopcroft, Peter O. Bragg, Fran Crucifix, Michel Davies-Barnard, Taraka Day, Jonathan J. The BRIDGE HadCM 3 family of climate models: HadCM v1.0
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