@Article{MarquesVadl:2001:CoAtBl,
               author = "Marques, R. F. C. and Vadlamudi, Brahmananda Rao",
          affiliation = "{CPTEC-INPE-Cachoeira Paulista-12630-000-SP-Brasil}",
                title = "A comparison of atmospheric blockings over the southeast and 
                         southwest Pacific ocean",
              journal = "Journal of the Meteorological Society of Japan",
                 year = "2001",
               volume = "79",
               number = "4",
                pages = "863--874",
                month = "aug.",
             keywords = "hemisphere, variabiblity, propagation, anomalies, dynamics, 
                         fields.",
             abstract = "Several earlier studies showed that the southwest Pacific near New 
                         Zealand is a region of blocking in the Southern Hemisphere. In 
                         this paper a second region of frequent blocking over the southeast 
                         Pacific is confirmed using 25 years of daily data. A comparison 
                         between the characteristics of blockings over the southwest and 
                         southeast Pacific revealed several interesting differences. 
                         Although the highest frequency of blocks occurs in the austral 
                         winter in both the regions, the frequency of blocks is greater 
                         over the southwest Pacific. However, these blocks are short lived 
                         and no block is found that lasts beyond 11 days duration. White 
                         over the southeast Pacific blocks are longer lasting with several 
                         blocks lasting for more than 11 clays duration. Local energetics 
                         of two blocks, one with a 21 day duration over the southeast 
                         Pacific and another with a 10 day duration over the southwest 
                         Pacific are analysed using Mak's formulation. The contributions 
                         from various temporal scale interactions (seasonal, intraseasonal 
                         and high frequency components) to the episodal average local 
                         energetics of these two blocks are evaluated. It is found that 
                         blocking disturbances in both the cases extract barotropically, 
                         kinetic energy from the seasonal diffluent jet at almost the same 
                         rate. But the redistribution of kinetic energy within the block 
                         region is wider for the southeast Pacific block than for the 
                         southwest Pacific blocks this seems to maintain the longer 
                         duration of the southeast Pacific block. The synoptic eddy 
                         straining mechanism proposed by Shutts is manifested in three 
                         energetic terms, of which one ((V) over right arrow (1.) (A) over 
                         right arrow (2, 2)) is found to be particularly large for both 
                         blocks. The pressure work process and the baroclinic conversion 
                         are also important, for both the blocks and the magnitudes are 
                         higher for the southeast Pacific block.",
           copyholder = "SID/SCD",
                 issn = "0026-1165",
             language = "en",
           targetfile = "10670.pdf",
                  url = "http://www.jstage.jst.go.jp/article/jmsj/79/4/863/_pdf",
        urlaccessdate = "03 maio 2024"
}