到 CDC 網站 http://www.cdc.noaa.gov/data/gridded/data.ncep.reanalysis2.pressure.html 下載高度資料 hgt.mon.mean.nc
用以下 GRADS script 便可繪畫 30 年氣候圖:
'reinit'
'sdfopen c:\hgt.mon.mean.nc'
'set lat 10 50'
'set lon 100 140'
'set lev 500'
'define mean=ave(hgt,t=9,t=360,12)'
'set t 1'
'set cint 10'
'set grads off'
'd mean'
'draw title Sep 500 hPa'
'printim c:\sep500.png white'
產品如下:
八, 九月的另外幾張:
http://s774.photobucket.com/albums/yy25/MartinWong_2009/?action=view¤t=aug200.png
http://s774.photobucket.com/albums/yy25/MartinWong_2009/?action=view¤t=aug500.png
http://s774.photobucket.com/albums/yy25/MartinWong_2009/?action=view¤t=aug925.png
http://s774.photobucket.com/albums/yy25/MartinWong_2009/?action=view¤t=sep200.png
http://s774.photobucket.com/albums/yy25/MartinWong_2009/?action=view¤t=sep500.png
http://s774.photobucket.com/albums/yy25/MartinWong_2009/?action=view¤t=sep925.png
不畫不知, 原來 500 上八月無脊, 九月反而有. 另外, 九月 200 脊剛好在沿岸附近, 故南海北部風切較低.
Saturday, August 29, 2009
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