@Article{MartinsSáMora:2013:CaSt,
               author = "Martins, Hardiney dos Santos and S{\'a}, Leonardo Deane de Abreu 
                         and Moraes, Osvaldo Luiz Leal de",
          affiliation = "1Departamento de F{\'{\i}}sica, Instituto Federal de 
                         Educa{\c{c}}{\~a}o, Ci{\^e}ncia e Tecnologia do Par{\'a} 
                         (IFPA), no1155,PA, Bel{\'e}m, 66093-020, Brazil and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)}",
                title = "Low Level Jets in the Pantanal Wetland Nocturnal Boundary Layer - 
                         Case Studies",
              journal = "American Journal of Environmental Engineering",
                 year = "2013",
               volume = "3",
               number = "1",
                pages = "32--47",
                 note = "{Setores de Atividade: Pesquisa e desenvolvimento 
                         cient{\'{\i}}fico.} and {Informa{\c{c}}{\~o}es Adicionais: 
                         Doi: 10.5923/j.ajee.20130301.06.}",
             keywords = "Pantanal, camada limite noturna, jatos de baixos n{\'{\i}}veis, 
                         regimes de estabilidade, wavelets.",
             abstract = "Situated in South America midwest region, Pantanal is a unique 
                         biome, alternating dry and flooded periods. An important seasonal 
                         variability characteristic from Pantanal's energy balance is the 
                         occurrence of situations in which sensible heat flux is positive 
                         (bottom-up) during night-time, when the region is flooded enough. 
                         In this study it is investigated an interesting aspect of 
                         Nocturnal Boundary Layer's (NBL) structure seasonal variability 
                         above Pantanal, that is, how Low-Level Jets (LLJ) occurrence and 
                         associated turbulent structure. For this, scale action of 
                         different Low-Level Jets (LLJ) types on Pantanal's Nocturnal 
                         Boundary Layer was investigated through case studies. Six events, 
                         distributed the following way, were used: Two events without LLJs, 
                         two events LLJs weak shear and two events LLJs strong shear. From 
                         the two events without LLJs, one of them is observed during the 
                         dry season and the other, during the flooded one. The same 
                         procedure was applied to other events (LLJs weak shear and LLJs 
                         strong shear). Vertical wind velocity and temperature variance, as 
                         well as the covariance among these variables were analyzed and 
                         investigated in scale via Wavelet Transform. Remarkable 
                         differences were observed among turbulence in NBL characteristics 
                         during the dry and flooded periods. It was observed that LLJ weak 
                         shear acts like a forcing that generates action of top-down 
                         mechanisms in the Pantanal's Nocturnal Boundary-layer. On the 
                         other hand, LLJ strong shear causes eddies blocking situations 
                         with length scales greater than the LLJ height. The decrease of 
                         the surface roughness at the flooded season, compared to the dry 
                         season, reduces remarkably the temperature variance in the lowest 
                         length scales below 350m. Such results are useful for a better 
                         understanding of seasonal variability in the Pantanal's Nocturnal 
                         Boundary-layer, as well as to other regions with similar 
                         environmental characteristics and must be taken into consideration 
                         in numerical simulations of the flow structure above the region.",
                  doi = "10.5923/j.ajee.20130301.06",
                  url = "http://dx.doi.org/10.5923/j.ajee.20130301.06",
                 issn = "2166-4633 and 2166-465X",
                label = "lattes: 0107976161469463 2 MartinsS{\'a}Mora:2013:CaSt",
             language = "en",
           targetfile = "10.5923.j.ajee.20130301.06.pdf",
        urlaccessdate = "17 jun. 2024"
}