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@Article{SapucciDiniBastAvan:2016:InGlNa,
               author = "Sapucci, Luiz Fernando and Diniz, F{\'a}bio Luiz Rodrigues and 
                         Bastarz, Carlos Frederico and Avan{\c{c}}o, Lucas Amarante",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)}",
                title = "Inclusion of Global Navigation Satellite System radio occultation 
                         data into Center for Weather Forecast and Climate Studies Local 
                         Ensemble Transform Kalman Filter (LETKF) using the Radio 
                         Occultation Processing Package as an observation operator",
              journal = "Meteorological Applications",
                 year = "2016",
               volume = "23",
               number = "2",
                pages = "328--338",
                month = "Apr.",
             keywords = "Data assimilation, GNSS radio occultation, LETKF, ROPP.",
             abstract = "The Local Ensemble Transform Kalman Filter (LETKF) is a system for 
                         data assimilation in the testing phase at the Center for Weather 
                         Forecast and Climate Studies of the Brazilian Institute for Space 
                         Research (CPTEC/INPE). This system introduces significant 
                         advantages over the traditional variational methodology in the 
                         inclusion of new observation systems because determining the 
                         observation operator does not involve inverse problems. The 
                         refractivity profile from the Global Navigation Satellite System 
                         (GNSS) radio occultation (RO) technique is an example of an 
                         additional source of unconventional observation with promising 
                         results over regions with low data coverage. To assimilate RO 
                         profiles using the LETKF system at CPTEC/INPE, the Radio 
                         Occultation Processing Package (ROPP) from Radio Occultation 
                         Meteorology Satellite Applications Facilities/European 
                         Organization for the Exploration of Meteorological Satellites (ROM 
                         SAF/EUMETSAT) was used as an observation operator. The goal of 
                         this work was to investigate the impact on the Atmospheric General 
                         Circulation Model of the CPTEC using ROPP as an operator of the 
                         assimilation of RO data into the LETKF system. The results showed 
                         that positive impacts were obtained in several evaluated 
                         variables, including humidity, particularly over South America, 
                         where the model used by the CPTEC produces better results.",
                  doi = "10.1002/met.1559",
                  url = "http://dx.doi.org/10.1002/met.1559",
                 issn = "1350-4827",
             language = "en",
           targetfile = "sapucci_inclusion.pdf",
        urlaccessdate = "01 dez. 2020"
}


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