Distribution of Articles published per year
(2005 - 2017)
(2005 - 2017)
Total number of journals
Article 0 Reads 0 Citations Impact of the equatorial Pacific and South Atlantic SST anomalies on extremes in austral summer precipitation over Grand... Published: 26 December 2017
International Journal of Climatology, doi: 10.1002/joc.5358
Grande river basin (GRB) is located in Southeast Brazil, and is socio-economic important for water supply and electricity generation from its hydroelectric plant reservoirs affected by the inter-annual variability of precipitation. Dry and rainy summers are selected using rainfall data from the National Water Agency (Agência Nacional de Águas–ANA) in Brazil to assess the influence of the equatorial Pacific and South Atlantic sea surface temperature (SST) anomalies, and to depict the intensity and positioning of large-scale circulation patterns that might affect the precipitation extremes in summer over GRB. The European Centre for Medium-Range Weather Forecasts global reanalysis provides the meteorological variables to construct the composites of the years of extremes (dry and rainy) in summer precipitation, as well as the preceding springs. The results show that extreme dry summers in GRB are characterized by neutral to negative SST anomalies in the equatorial Pacific and positive anomalies in the subtropical South Atlantic near Brazilian coastline. Rainy extremes are associated with El Niño conditions in Niño 1 + 2, Niño 3 and 3.4 regions during summer and preceding spring. Extreme rainy summers display negative anomalies of SST in the subtropical South Atlantic, coinciding with the northerly South Atlantic Convergence Zone positioning. In GRB, anomalous rainy springs are mostly followed by anomalous dry summers. Large-scale atmospheric circulation anomalies in the preceding springs to summer precipitation extremes in GRB show characteristic features that might be proven useful in seasonal predictions of hydro-meteorological extremes.
Article 0 Reads 114 Citations The North American Regional Climate Change Assessment Program: Overview of Phase I Results Published: 01 September 2012
Bulletin of the American Meteorological Society, doi: 10.1175/bams-d-11-00223.1
The North American Regional Climate Change Assessment Program (NARCCAP) is an international effort designed to investigate the uncertainties in regional-scale projections of future climate and produce highresolution climate change scenarios using multiple regional climate models (RCMs) nested within atmosphere–ocean general circulation models (AOGCMs) forced with the Special Report on Emission Scenarios (SRES) A2 scenario, with a common domain covering the conterminous United States, northern Mexico, and most of Canada. The program also includes an evaluation component (phase I) wherein the participating RCMs, with a grid spacing of 50 km, are nested within 25 years of National Centers for Environmental Prediction–Department of Energy (NCEP–DOE) Reanalysis II. This paper provides an overview of evaluations of the phase I domain-wide simulations focusing on monthly and seasonal temperature and precipitation, as well as more detailed investigation of four subregions. The overall quality of the simulations is determined, comparing the model performances with each other as well as with other regional model evaluations over North America. The metrics used herein do differentiate among the models but, as found in previous studies, it is not possible to determine a “best” model among them. The ensemble average of the six models does not perform best for all measures, as has been reported in a number of global climate model studies. The subset ensemble of the two models using spectral nudging is more often successful for domain-wide root-mean-square error (RMSE), especially for temperature. This evaluation phase of NARCCAP will inform later program elements concerning differentially weighting the models for use in producing robust regional probabilities of future climate change.
Article 0 Reads 30 Citations Regional Extreme Monthly Precipitation Simulated by NARCCAP RCMs Published: 01 December 2010
Journal of Hydrometeorology, doi: 10.1175/2010jhm1297.1
Article 0 Reads 3 Citations Influence of Precipitation Assimilation on a Regional Climate Model’s Surface Water and Energy Budgets Published: 01 August 2007
Journal of Hydrometeorology, doi: 10.1175/jhm615.1
Article 0 Reads 2 Citations Improving Regional Model Simulations with Precipitation Assimilation Published: 01 October 2005
Earth Interactions, doi: 10.1175/ei138.1