@MastersThesis{Cohen:1989:EsObLi,
               author = "Cohen, J{\'u}lia Clarinda Paiva",
                title = "Um estudo observacional de linhas de instabilidade na 
                         Amaz{\^o}nia",
               school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
                 year = "1989",
              address = "S{\~a}o Jos{\'e} dos Campos",
                month = "1989-02-09",
             keywords = "meteorologia din{\^a}mica, Amaz{\^o}nia, linhas de 
                         instabilidade, jato de leste, dynamic meteorology, Amazonia, 
                         squall lines, easterly jet.",
             abstract = "Bandas de nuvens convectivas formam-se na costa norte-nordeste da 
                         Am{\'e}rica do Sul. Algumas destas bandas movem-se continente 
                         adentro como uma linha de instabilidade (LI). As LIs sem 
                         propaga{\c{c}}{\~a}o s{\~a}o denominadas LI Costeira (LIC) e as 
                         Lis com propaga{\c{c}}{\~a}o s{\~a}o identificadas por LIP. 
                         H{\'a} duas categorias de LIPs: (a) com deslocamento horizontal 
                         entre 170 e 400 km a partir da costa (LIP1) e (b) com 
                         penetra{\c{c}}{\~a}o horizontal al{\'e}m de 400 km (LIP2). A 
                         m{\'a}xima frequ{\^e}ncia das LIs ocorre entre abril e agosto. A 
                         velocidade m{\'e}dia de propaga{\c{c}}{\~a}o da LIP1 e LIP2 e 
                         12 e 16 m/s, respectivamente. A maioria das LIs s{\~a}o 
                         observadas ao sul da ZCIT no Atl{\^a}ntico (ZCITA). A LIP2 {\'e} 
                         mais frequente quando a ZCITA est{\'a} bem estabelecida e a LIP1 
                         n{\~a}o {\'e} dependente da condi{\c{c}}{\~a}o da ZCITA. A 
                         dimens{\~a}o m{\'e}dia destes sistemas {\'e} 1400 km de 
                         comprimento e 170 km de largura. O jato de leste nos baixos 
                         n{\'{\i}}veis {\'e} um elemento dominante na 
                         propaga{\c{c}}{\~a}o da LI. As LIPs est{\~a}o associados com 
                         uma camada de jato de leste com velocidade quase constante. As 
                         caracter{\'{\i}}sticas termodin{\^a}micas e din{\^a}micas 
                         antes e ap{\'o}s a passagem de uma LIP2 s{\~a}o similares as 
                         estruturas observadas na LIs em outras regi{\~o}es. ABSTRACT: 
                         Bands of convective clouds are originated at the northern coast of 
                         South America. Some of bands move inland as squall lines (SL). The 
                         non-propagating lines are denominated Coastal Squall Lines (CSL) 
                         and the Propagating SL are identified by PSL. There are two 
                         categories of PSL: (a) horizontal displacement between 170 and 400 
                         km from the coast (PSL1) and (b) horizontal penetration beyond 400 
                         km (PSL2). The greastest frequency of SL occurs between April and 
                         August. The average speed of propagation of PSL1 and PSL2 are 12 
                         and 16 m/s, respectively. Most of the SL are observed to the South 
                         of the Atlantic ITCZ. The PSL2 is more frequent when the ITCZ is 
                         established and PSL1 is not dependent on the ITCZ condition. The 
                         mean dimensions of the SL are 1400 km in length and 170 km in 
                         width. A lower level easterly jet is a dominant element in the 
                         propagation of the SL. The SLP is associated with a deep layer of 
                         almost constant speed of the easterly jet. The thermodynamical and 
                         dynamics characteristics before and after the passage of the SL 
                         are similar to the observed structure of SL in other regions.",
            committee = "Silva Dias, Pedro Leite da (presidente) and Nobre, Carlos Afonso 
                         (orientador) and Silva Dias, Maria Assun{\c{c}}{\~a}o Faus da 
                         (orientadora) and Caetano Neto, Ernesto dos Santos and 
                         Innocentini, Valdir",
           copyholder = "SID/SCD",
         englishtitle = "An observational study of instability lines in the Amazon",
             language = "pt",
                pages = "159",
                  ibi = "6qtX3pFwXQZGivnJSY/Hchjg",
                  url = "http://urlib.net/ibi/6qtX3pFwXQZGivnJSY/Hchjg",
           targetfile = "publicacao.pdf",
        urlaccessdate = "09 maio 2024"
}