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| View Original: | Sahel rainfall timeseries de.svg (1200x500) | |||
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| Keywords: Sahel rainfall timeseries de.svg validSVG en More than a century of rainfall data in the Sahel show an unusually wet period from 1950 until 1970 positive index values followed by extremely dry years from 1970 to 1990 negative index values From 1990 until present rainfall returned to levels slightly below the 1898 “1993 average but year-to-year variability was high de Abweichung der Sahelzonen-Niederschlagsmenge vom Mittelwert des 20 Jahrhunderts Der Zeitraum 1950-1970 war ungewöhnlich feucht positive Werte der Zeitraum 1970 bis 1990 extrem trocken negative Werte Own work based on http //jisao washington edu/ JISAO http //jisao washington edu/data_sets/sahel/ data Benedikt Seidl 2008-06-28 Image Sahel_rainfall_timeseries gif Quellcode download the data <source lang python > /usr/bin/python - - coding utf-8 - - import urllib def main url http //jisao washington edu/data_sets/sahel/ line_before +0 1 2 3 4 5 6 7 8 9\n data urllib urlopen url for line in data if line line_before for ten_years in data ten_years ten_years strip if ten_years break elements map int ten_years split year_start rain_data elements0 elements1 for year rain_data in enumerate rain_data year_start print 0 1 format year rain_data if __name__ '__main__' main </source> gnuplot <source lang gnuplot > /usr/bin/gnuplot set terminal svg enhanced size 1200 500 fname DejaVuSans fsize 18 set output Sahel_rainfall_timeseries_de svg set noborder set key reverse right bottom set nokey set xtics nomirror out set ytics nomirror out set ylabel 'Sahel Niederschlag Index' set yrange -4 4 set xlabel 'Jahr' set style line 12 lc rgb ' cccccc' set grid ytics front linestyle 12 set xtics 1900 0 1910 10 1920 20 1930 30 1940 40 1950 50 1960 60 1970 70 1980 80 1990 90 2000 100 2010 110 2020 120 set style data histogram set style histogram cluster gap 0 2 set style fill solid noborder set boxwidth 0 9 plot 'rain data' u 2/100 ti col lc rgb ' 000080' </source> execute <source lang bash > python rain py > rain data gnuplot rain dem </source> Sahel z Climate diagrams of Africa Precipitation diagrams SVG charts in German | ||||
