System and Method for Defining of ＢＳＩＳＯ index over the Asian monsoon region

摘要

The present invention relates to a system and a method for defining the boreal summer intraseasonal oscillation in the Asian monsoon region, which comprise a reference data extracting unit which extracts daily average outgoing longwave radiation (OLR) and 850 hPa east and west wind data over a predetermined period in an area for calculation; an interannualvariability and seasonal periodieity effect removing unit which is to remove an interannualvariability and seasonal periodieity effect from the daily average OLR and 850 hPa east and west wind data; a data normalizing unit which normalizes the OLR and 850 hPa east and west wind data as an average standard deviation for the Asian monsoon region; an MV-EOF applying unit which applies the OLR and 850 hPa east and west wind data to a multivariate experiential orthogonal function in order to calculate the boreal summer intraseasonal oscillation (BSISO); and a first and second boreal summer intraseasonal oscillation (BSISO) calculating unit which defines a main component time series in a first and a second mode, acquired by applying to the multivariate experiential orthogonal function, as BSISO1 while defining a main component time series in a third and a fourth mode as BSISO2. [Reference numerals] (S601) Extracts daily average OLR50 hPa east and west wind data over a predetermined period in an area for calculation;(S602) Remove an interannualvariability and seasonal periodieity effect from the daily average OLR and 850 hPa east and west wind data;(S603) Normalize the OLR and 850 hPa east and west wind data as an average standard deviation for the Asian monsoon region;(S604) Apply the OLR and 850 hPa east and west wind data to a multivariate experiential orthogonal function;(S605) Define a main component time series in a first and a second mode as boreal summer intraseasonal oscillation (BSISO1);(S606) Define a main component time series in a third and a fourth mode as boreal summer intraseasonal oscillation (BSISO2)