@InProceedings{HirataMöll:2006:PrRe,
               author = "Hirata, Fernando Endo and M{\"o}ller J{\'u}nior, Osmar Olinto",
          affiliation = "Funda{\c{c}}{\~a}o Universidade Federal do Rio Grande, 
                         Laborat{\'o}rio de Oceanografia F{\'{\i}}sica and Av. 
                         It{\'a}lia, km 8, s/n, 96201-900, Rio Grande, RS, Brazil (Hirata 
                         and {M{"o}ller)}",
                title = "Interannual variability of rainfall and streamflow in the Patos 
                         Lagoon basin: preliminary results",
            booktitle = "Proceedings...",
                 year = "2006",
               editor = "Vera, Carolina and Nobre, Carlos",
                pages = "775--780",
         organization = "International Conference on Southern Hemisphere Meteorology and 
                         Oceanography, 8. (ICSHMO).",
            publisher = "American Meteorological Society (AMS)",
              address = "45 Beacon Hill Road, Boston, MA, USA",
             keywords = "rainfall and streamflow variability, El-Niño Southern Oscillation, 
                         Patos Lagoon.",
             abstract = "Patos Lagoon basin (in southern Brazil) has a drainage area of 
                         approximately 200,000 km2 and cover almost half of Rio Grande do 
                         Sul state. The discharge of the Lagoon is a very important 
                         environmental factor for local tourism, fisheries and navigation. 
                         To identify variability patterns of rainfall and streamflow in the 
                         Patos Lagoon basin and compare them to those found previously for 
                         Southeastern South America (SSA), data from 17 rainfall and 3 
                         streamflow stations covering the 1978-2002 period (25 years) were 
                         analyzed. Scientific literature describes relations between 
                         interannual variability of rainfall in SSA and El-Niño/Southern 
                         Oscillation (ENSO) as well as a relationship between the Southern 
                         Oscillation (SO) and the streamflow of Negro and Uruguay rivers: 
                         lower than average in La Niña (LN) years and higher than average 
                         in El Niño (EN) years. Aproximate 3 and 6 years signals, both in 
                         the range of variability of the ENSO cycles, were identified as 
                         dominant oscillation modes for streamflow in the Uruguay river 
                         basin on interanual timescale. For PAtos Lagoon basin, the power 
                         spectral density of all series showed peaks that corresponds to 
                         periods of 3 and 4 years, in agreement with the relationships 
                         between rainfall, streamflow and the SO cited above. Spacial 
                         variability were also investigated using other stations located at 
                         Rio Grande do Sul state and Empirical Orthogonal Functions (EOF). 
                         The first and the second modes of variability are responsible for 
                         approximately 65% of the total variance. The first mode (52%) is 
                         positive for al the stations and seems to be related to the warm 
                         phase of SO (EN), which is associated to positive rainfall 
                         anomalies in southern Brazil. The second mode (13%), negative for 
                         southern stations, seems to be related to the cold phase of SO (LA 
                         - negative anomalies for the region). Applied to the streamflow 
                         stations, the EOF showed a first mode that corresponds to 88% of 
                         the total variance and is positive for the three major rivers of 
                         Patos Lagoon basin (Jacu{\'{\i}}, Taquari and Camaqu{\~a}). The 
                         power spectral density of this principal component indicated a 
                         dominant peak for approximately 4 year period, probably related to 
                         ENSO.",
  conference-location = "Foz do Igua{\c{c}}u",
      conference-year = "24-28 Apr. 2006",
             language = "en",
         organisation = "American Meteorological Society (AMS)",
                  ibi = "cptec.inpe.br/adm_conf/2005/10.24.16.12",
                  url = "http://urlib.net/ibi/cptec.inpe.br/adm_conf/2005/10.24.16.12",
           targetfile = "775-780.pdf",
                 type = "Hydrological variability and modeling",
        urlaccessdate = "02 maio 2024"
}