%0 Journal Article
%4 sid.inpe.br/mtc-m18@80/2009/08.05.16.36
%2 sid.inpe.br/mtc-m18@80/2009/08.05.16.36.45
%@doi 10.1007/s00704-008-0080-y
%@issn 0177-798X
%T Determination of the onset dates of the rainy season in central Amazon with equatorialy antisymetric outgoing longwave radiation
%D 2009
%8 Aug
%A Garcia, Sāmia R.,
%A Kayano, Mary Toshie,
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@electronicmailaddress samia.garcia@cptec.inpe.br
%@electronicmailaddress mary.kayano@cptec.inpe.br
%B Theoretical and Applied Climatology
%V 97
%N 3-4
%P 361-372
%K Monsoon, precipitation, circulation, hemiosphere, South America.
%X The present work provides a new methodology to determine onset dates of the rainy season (ONR) in central Amazon (CAM) using the antisymmetric in relation to the equator outgoing longwave radiation (OLR) (AOLR) data, for the 19792006 period. Spatial averages of the AOLR () over the CAM for the ONR periods are obtained. These periods correspond to 25 pentads centered on the mean pentad for the ONR. The sign changes from positive to negative of the for the ONR periods indicate the transition from dry to wet season. Composites of several variables are done for pentads before and after the ONR dates. These composites show physically consistent features. The potential of the time series as an index for monitoring tasks is analyzed. The results here show that the for the ONR period captures the transition from dry to wet conditions in the CAM area during 2006. The advantages of this method are discussed. The new simple method proposed here seems to be efficient in determining the ONR in the CAM.
%@language en
%3 determination.pdf